Craig,
Agilent has a User's manual for the counter, including options 010,
011, 020, 030 and 040.
I have it downloaded.
I also have a 93 page Installation & Operation manual for option 011.
Furthermore some MIL documents.
All is downloaded from the Internet.

Jos
PA0AMX

At 21:58 31-8-2006 +0100, you wrote:
> > So where can I get the service manual for my options (21 and 41
> > preferably) ?
>
>Or if not eBay, try http://www.artekmedia.com/page3.html who has a counter
>manual and complete set of manuals on pdf for $15.
>
>Craig
>
>
>
>
>Yahoo! Groups Links
>
>
>
>

Hi Chaps,

Apologies for the off topic post (though I'm still an avid user of hp stuff ;)

Looking to clear out most of my workshop for reorganising for EFI/manufacturing
stuff,
and have a box or two of oldie "73" magazines plus a few "Radio Electronics"
going back
some 25 to 35 years or so, I'm curious if they are worth anything as I notice in
last few
weeks a heavy discussion of RF related topics etc ?  I'm not that much into RF
myself
except designed a couple of pocsag encoders and decoders for VHF and UHF bands
where i really only concentrated on microprocessors but still used my trusty
HP1631A/D
for timing and a HP6813A for power cycling but sold it recently <sigh>

Also have a few HP Journal going back same period or older, any interest out
there ?



Regards from


Mike Massen
Network Power Systems
Lab +61 (0) 8 9444 8961
Mb +61 (0) 438 048961
Perth, Western Australia
* USA GMC  and Australian VL/VK Commodore Fuse Rail that wont warp or melt !
* Skyline/Nissan/VL Milspec ignition driver now in long term economy trials
* Twin tyres for most sedans, trikes and motorcycle sidecars
* Industrial grade PolyVinyliDeneChloride (PVDC Copolymer) in bulk, the best
   oxygen and water protective barrier you can find for circuit boards.
* Special Equipment for sale: 60KVA 3-phase UPS with large battery cabinet -
$12,000
Web site under construction, Ebay and Oztion Auctions   
http://niche.iinet.net.au

Hi Chuck,

I recall hearing that some of the early 410C used the 2-01C as in the 410B
and these run at 5v.  Do you have any info on that?  I also recall that the
410C has no adjustment for the filament voltage while the 410B did have this
adjustment. Since it seems there are more 410B HV probes available than
410C, any easy way to adjust the 410C to use a 410B  2-01C probe?
73 Jerry
K1JOS


   -----Original Message-----
   From: hp_agilent_equipment@yahoogroups.com
[mailto:hp_agilent_equipment@yahoogroups.com]On Behalf Of Chuck Harris
   Sent: Thursday, August 31, 2006 7:11 AM
   To: hp_agilent_equipment@yahoogroups.com
   Subject: Re: [hp_agilent_equipment] Re: HP410C CHOPPER FREQUENCY SETTINGS
FOR 50Hz LINE ? ...FIXED!!


   hpxref wrote:

   > Now, does anyone know if the fil supply should be 5v or 6 v?
   > (for S/N 550-06965)
   > I would like to know before starting a complete CAL bench check

   There is no controversy here, all 410C's are 6VDC filament for the
   12AT7, and 6.3V unregulated AC for the probe.

   -Chuck Harris





[Non-text portions of this message have been removed]

Hello all,
I've been following the thread.
I have two 410B junkers on the shelf, if you are in the Long Island, NY area and
have an interest, drop me a note.

Jim
   ----- Original Message -----
   From: JOS Earthlink
   To: hp_agilent_equipment@yahoogroups.com
   Sent: Friday, September 01, 2006 10:24 AM
   Subject: RE: [hp_agilent_equipment] Re: HP410C CHOPPER FREQUENCY SETTINGS FOR
50Hz LINE ? ...FIXED!!


   Hi Chuck,

   I recall hearing that some of the early 410C used the 2-01C as in the 410B
   and these run at 5v. Do you have any info on that? I also recall that the
   410C has no adjustment for the filament voltage while the 410B did have this
   adjustment. Since it seems there are more 410B HV probes available than
   410C, any easy way to adjust the 410C to use a 410B 2-01C probe?
   73 Jerry
   K1JOS

   -----Original Message-----
   From: hp_agilent_equipment@yahoogroups.com
   [mailto:hp_agilent_equipment@yahoogroups.com]On Behalf Of Chuck Harris
   Sent: Thursday, August 31, 2006 7:11 AM
   To: hp_agilent_equipment@yahoogroups.com
   Subject: Re: [hp_agilent_equipment] Re: HP410C CHOPPER FREQUENCY SETTINGS
   FOR 50Hz LINE ? ...FIXED!!

   hpxref wrote:

   > Now, does anyone know if the fil supply should be 5v or 6 v?
   > (for S/N 550-06965)
   > I would like to know before starting a complete CAL bench check

   There is no controversy here, all 410C's are 6VDC filament for the
   12AT7, and 6.3V unregulated AC for the probe.

   -Chuck Harris

   [Non-text portions of this message have been removed]






[Non-text portions of this message have been removed]

Hello!

Sorry for this off-topic but I need help with an eBay fraud. Seller is from
Germany so a german person would be perfect. Please, contact me directly.

Thanks!

JOSE
----------------------------------------------------------------------
    73 EB5AGV / EC5AAU - JOSE V. GAVILA
       La Canyada - Valencia (SPAIN) - Loc: IM99SM

    Vintage Radio: http://jvgavila.com
    Vintage Test Equipment: http://jvgavila.com/testeq.htm
    European Boatanchors List: http://groups.yahoo.com/group/euro_ba_swap

the 410b ac  probe  isnt  plugin  its not  the  probe  but  the  installed 
diode  that requires  voltage  adjustment
   ----- Original Message -----
   From: JOS Earthlink
   To: hp_agilent_equipment@yahoogroups.com
   Sent: Friday, September 01, 2006 9:24 AM
   Subject: RE: [hp_agilent_equipment] Re: HP410C CHOPPER FREQUENCY SETTINGS FOR
50Hz LINE ? ...FIXED!!


   Hi Chuck,

   I recall hearing that some of the early 410C used the 2-01C as in the 410B
   and these run at 5v. Do you have any info on that? I also recall that the
   410C has no adjustment for the filament voltage while the 410B did have this
   adjustment. Since it seems there are more 410B HV probes available than
   410C, any easy way to adjust the 410C to use a 410B 2-01C probe?
   73 Jerry
   K1JOS

   -----Original Message-----
   From: hp_agilent_equipment@yahoogroups.com
   [mailto:hp_agilent_equipment@yahoogroups.com]On Behalf Of Chuck Harris
   Sent: Thursday, August 31, 2006 7:11 AM
   To: hp_agilent_equipment@yahoogroups.com
   Subject: Re: [hp_agilent_equipment] Re: HP410C CHOPPER FREQUENCY SETTINGS
   FOR 50Hz LINE ? ...FIXED!!

   hpxref wrote:

   > Now, does anyone know if the fil supply should be 5v or 6 v?
   > (for S/N 550-06965)
   > I would like to know before starting a complete CAL bench check

   There is no controversy here, all 410C's are 6VDC filament for the
   12AT7, and 6.3V unregulated AC for the probe.

   -Chuck Harris

   [Non-text portions of this message have been removed]





[Non-text portions of this message have been removed]

I know but the diodes themselves are not interchangeable in the 410C probe.
So my question was how does one adjust the voltage in the 410C meter from 6v
to 5v in order to use a 410B HV probe with the 410C meter.

Jerry
K1JOS

   -----Original Message-----
   From: hp_agilent_equipment@yahoogroups.com
[mailto:hp_agilent_equipment@yahoogroups.com]On Behalf Of arthurok
   Sent: Friday, September 01, 2006 6:43 PM
   To: hp_agilent_equipment@yahoogroups.com
   Subject: Re: [hp_agilent_equipment] Re: HP410C CHOPPER FREQUENCY SETTINGS
FOR 50Hz LINE ? ...FIXED!!


   the 410b ac probe isnt plugin its not the probe but the installed diode
that requires voltage adjustment
   ----- Original Message -----
   From: JOS Earthlink
   To: hp_agilent_equipment@yahoogroups.com
   Sent: Friday, September 01, 2006 9:24 AM
   Subject: RE: [hp_agilent_equipment] Re: HP410C CHOPPER FREQUENCY SETTINGS
FOR 50Hz LINE ? ...FIXED!!

   Hi Chuck,

   I recall hearing that some of the early 410C used the 2-01C as in the 410B
   and these run at 5v. Do you have any info on that? I also recall that the
   410C has no adjustment for the filament voltage while the 410B did have
this
   adjustment. Since it seems there are more 410B HV probes available than
   410C, any easy way to adjust the 410C to use a 410B 2-01C probe?
   73 Jerry
   K1JOS

   -----Original Message-----
   From: hp_agilent_equipment@yahoogroups.com
   [mailto:hp_agilent_equipment@yahoogroups.com]On Behalf Of Chuck Harris
   Sent: Thursday, August 31, 2006 7:11 AM
   To: hp_agilent_equipment@yahoogroups.com
   Subject: Re: [hp_agilent_equipment] Re: HP410C CHOPPER FREQUENCY SETTINGS
   FOR 50Hz LINE ? ...FIXED!!

   hpxref wrote:

   > Now, does anyone know if the fil supply should be 5v or 6 v?
   > (for S/N 550-06965)
   > I would like to know before starting a complete CAL bench check

   There is no controversy here, all 410C's are 6VDC filament for the
   12AT7, and 6.3V unregulated AC for the probe.

   -Chuck Harris

   [Non-text portions of this message have been removed]

   [Non-text portions of this message have been removed]






[Non-text portions of this message have been removed]

use  a  couple  of  silicon  diodes  in  series
   ----- Original Message -----
   From: JOS Earthlink
   To: hp_agilent_equipment@yahoogroups.com
   Sent: Friday, September 01, 2006 5:47 PM
   Subject: RE: [hp_agilent_equipment] Re: HP410C CHOPPER FREQUENCY SETTINGS FOR
50Hz LINE ? ...FIXED!!


   I know but the diodes themselves are not interchangeable in the 410C probe.
   So my question was how does one adjust the voltage in the 410C meter from 6v
   to 5v in order to use a 410B HV probe with the 410C meter.

   Jerry
   K1JOS

   -----Original Message-----
   From: hp_agilent_equipment@yahoogroups.com
   [mailto:hp_agilent_equipment@yahoogroups.com]On Behalf Of arthurok
   Sent: Friday, September 01, 2006 6:43 PM
   To: hp_agilent_equipment@yahoogroups.com
   Subject: Re: [hp_agilent_equipment] Re: HP410C CHOPPER FREQUENCY SETTINGS
   FOR 50Hz LINE ? ...FIXED!!

   the 410b ac probe isnt plugin its not the probe but the installed diode
   that requires voltage adjustment
   ----- Original Message -----
   From: JOS Earthlink
   To: hp_agilent_equipment@yahoogroups.com
   Sent: Friday, September 01, 2006 9:24 AM
   Subject: RE: [hp_agilent_equipment] Re: HP410C CHOPPER FREQUENCY SETTINGS
   FOR 50Hz LINE ? ...FIXED!!

   Hi Chuck,

   I recall hearing that some of the early 410C used the 2-01C as in the 410B
   and these run at 5v. Do you have any info on that? I also recall that the
   410C has no adjustment for the filament voltage while the 410B did have
   this
   adjustment. Since it seems there are more 410B HV probes available than
   410C, any easy way to adjust the 410C to use a 410B 2-01C probe?
   73 Jerry
   K1JOS

   -----Original Message-----
   From: hp_agilent_equipment@yahoogroups.com
   [mailto:hp_agilent_equipment@yahoogroups.com]On Behalf Of Chuck Harris
   Sent: Thursday, August 31, 2006 7:11 AM
   To: hp_agilent_equipment@yahoogroups.com
   Subject: Re: [hp_agilent_equipment] Re: HP410C CHOPPER FREQUENCY SETTINGS
   FOR 50Hz LINE ? ...FIXED!!

   hpxref wrote:

   > Now, does anyone know if the fil supply should be 5v or 6 v?
   > (for S/N 550-06965)
   > I would like to know before starting a complete CAL bench check

   There is no controversy here, all 410C's are 6VDC filament for the
   12AT7, and 6.3V unregulated AC for the probe.

   -Chuck Harris

   [Non-text portions of this message have been removed]

   [Non-text portions of this message have been removed]

   [Non-text portions of this message have been removed]





[Non-text portions of this message have been removed]

Hi Jerry,

That presents a bit of a problem.  In any mode other than AC, the probe has
6.3Vac on the filament.  In AC, it has 6VDC on the filament.  I think they
are worried about cathode interface problems, but from what I have read, they
are doing it backwards...

To lower the DC filament, a couple of 1N4001 diodes in series will do a good
enough job, but the AC filament will require a series resistor.

I'm not sure that the two tubes are physically interchangeable, though.
I know that they look close, but I recall something about one having a fillet
somewhere where the other is square shouldered.  I guess that you could cut
a 410B probe cable, and install a stereo phone jack, and use the whole thing.

-Chuck

JOS Earthlink wrote:
> Hi Chuck,
>
> I recall hearing that some of the early 410C used the 2-01C as in the 410B
> and these run at 5v.  Do you have any info on that?  I also recall that the
> 410C has no adjustment for the filament voltage while the 410B did have this
> adjustment. Since it seems there are more 410B HV probes available than
> 410C, any easy way to adjust the 410C to use a 410B  2-01C probe?
> 73 Jerry
> K1JOS
>
>
>   -----Original Message-----
>   From: hp_agilent_equipment@yahoogroups.com
> [mailto:hp_agilent_equipment@yahoogroups.com]On Behalf Of Chuck Harris
>   Sent: Thursday, August 31, 2006 7:11 AM
>   To: hp_agilent_equipment@yahoogroups.com
>   Subject: Re: [hp_agilent_equipment] Re: HP410C CHOPPER FREQUENCY SETTINGS
> FOR 50Hz LINE ? ...FIXED!!
>
>
>   hpxref wrote:
>
>   > Now, does anyone know if the fil supply should be 5v or 6 v?
>   > (for S/N 550-06965)
>   > I would like to know before starting a complete CAL bench check
>
>   There is no controversy here, all 410C's are 6VDC filament for the
>   12AT7, and 6.3V unregulated AC for the probe.
>
>   -Chuck Harris
>
>
>
>
>
> [Non-text portions of this message have been removed]
>
>
>
>
> Yahoo! Groups Links
>
>
>
>
>
>
>

--- In hp_agilent_equipment@yahoogroups.com, Chuck Harris
<cfharris@...> wrote:

> That presents a bit of a problem.  In any mode other than AC, the
probe has
> 6.3Vac on the filament.  In AC, it has 6VDC on the filament.  I
think they
> are worried about cathode interface problems, but from what I have
read, they
> are doing it backwards...
>
> To lower the DC filament, a couple of 1N4001 diodes in series will
do a good
> enough job, but the AC filament will require a series resistor.
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
REPLY FROM HPXREF:

You should be able to use the diode trick to lower the AC filanment
voltage by running a PAIR of series connected silicon diodes back to
back... You get an AC voltage out  clipped to the 6.3 v ac less the
two forward diode drops  on each half of the ac cycle.

Rgds  John (hpxref)

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

> >
> JOS Earthlink wrote:
> > Hi Chuck,
> >
> > I recall hearing that some of the early 410C used the 2-01C as in
the 410B
> > and these run at 5v.  Do you have any info on that?  I also
recall that the
> > 410C has no adjustment for the filament voltage while the 410B
did have this
> > adjustment. Since it seems there are more 410B HV probes
available than
> > 410C, any easy way to adjust the 410C to use a 410B  2-01C probe?
> > 73 Jerry
> > K1JOS
> >
> >
> >   -----Original Message-----
> >   From: hp_agilent_equipment@yahoogroups.com
> > [mailto:hp_agilent_equipment@yahoogroups.com]On Behalf Of Chuck
Harris
> >   Sent: Thursday, August 31, 2006 7:11 AM
> >   To: hp_agilent_equipment@yahoogroups.com
> >   Subject: Re: [hp_agilent_equipment] Re: HP410C CHOPPER
FREQUENCY SETTINGS
> > FOR 50Hz LINE ? ...FIXED!!
> >
> >
> >   hpxref wrote:
> >
> >   > Now, does anyone know if the fil supply should be 5v or 6 v?
> >   > (for S/N 550-06965)
> >   > I would like to know before starting a complete CAL bench
check
> >
> >   There is no controversy here, all 410C's are 6VDC filament for
the
> >   12AT7, and 6.3V unregulated AC for the probe.
> >
> >   -Chuck Harris
> >
> >
> >
> >
> >
> > [Non-text portions of this message have been removed]
> >
> >
> >
> >
> > Yahoo! Groups Links
> >
> >

If you use a pair of diodes, back to back, then the drop in voltage will be
less than you might think.

Maximum volt drop across each diode will be at maximum current flow,
which for a resistive load will be at the peak of the 6.3 Vac, ie, 8.91 V.
Now, subtract 0V6 to 0V7 and you get a peak of 8V21 to 8V31. This
corresponds to about 5V81 to 5V87 ac. To get close to 5 Vac, you'll
need at least two pairs back to back in series - so, like, use a bridge
rectifier, with ac in at one of the ac terminals and ac out at the other
ac terminal. Then you'll get about 5V3.

And if you want dc with pulses at twice the mains frequency, pick
that up from the dc out terminals. But, don't put a smoothing [filter]
capacitor in the circuit or you'll get a much higher voltage than you
want.

73 de Brian, VK2GCE.


[Non-text portions of this message have been removed]

Wait a second. Back to back means cathode to cathode
or anode to anode, through which you would not get any
current flow at all. No doubt you mean this:

---->|--->|----
|            |
|---|<---|<--|

But why not just a single resistor ?

AW



--- hpxref <face1941@...> wrote:

> --- In hp_agilent_equipment@yahoogroups.com, Chuck
> Harris
> <cfharris@...> wrote:
>
> > That presents a bit of a problem.  In any mode
> other than AC, the
> probe has
> > 6.3Vac on the filament.  In AC, it has 6VDC on the
> filament.  I
> think they
> > are worried about cathode interface problems, but
> from what I have
> read, they
> > are doing it backwards...
> >
> > To lower the DC filament, a couple of 1N4001
> diodes in series will
> do a good
> > enough job, but the AC filament will require a
> series resistor.
>
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
> REPLY FROM HPXREF:
>
> You should be able to use the diode trick to lower
> the AC filanment
> voltage by running a PAIR of series connected
> silicon diodes back to
> back... You get an AC voltage out  clipped to the
> 6.3 v ac less the
> two forward diode drops  on each half of the ac
> cycle.
>
> Rgds  John (hpxref)
>
>
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
>
> > >
> > JOS Earthlink wrote:
> > > Hi Chuck,
> > >
> > > I recall hearing that some of the early 410C
> used the 2-01C as in
> the 410B
> > > and these run at 5v.  Do you have any info on
> that?  I also
> recall that the
> > > 410C has no adjustment for the filament voltage
> while the 410B
> did have this
> > > adjustment. Since it seems there are more 410B
> HV probes
> available than
> > > 410C, any easy way to adjust the 410C to use a
> 410B  2-01C probe?
> > > 73 Jerry
> > > K1JOS
> > >
> > >
> > >   -----Original Message-----
> > >   From: hp_agilent_equipment@yahoogroups.com
> > > [mailto:hp_agilent_equipment@yahoogroups.com]On
> Behalf Of Chuck
> Harris
> > >   Sent: Thursday, August 31, 2006 7:11 AM
> > >   To: hp_agilent_equipment@yahoogroups.com
> > >   Subject: Re: [hp_agilent_equipment] Re: HP410C
> CHOPPER
> FREQUENCY SETTINGS
> > > FOR 50Hz LINE ? ...FIXED!!
> > >
> > >
> > >   hpxref wrote:
> > >
> > >   > Now, does anyone know if the fil supply
> should be 5v or 6 v?
> > >   > (for S/N 550-06965)
> > >   > I would like to know before starting a
> complete CAL bench
> check
> > >
> > >   There is no controversy here, all 410C's are
> 6VDC filament for
> the
> > >   12AT7, and 6.3V unregulated AC for the probe.
> > >
> > >   -Chuck Harris
> > >
> > >
> > >
> > >
> > >
> > > [Non-text portions of this message have been
> removed]
> > >
> > >
> > >
> > >
> > > Yahoo! Groups Links
> > >
> > >
>
>
>
>
>


__________________________________________________
Do You Yahoo!?
Tired of spam?  Yahoo! Mail has the best spam protection around
http://mail.yahoo.com

a  resistor  would  work  fine  just   mount  it  securely
   ----- Original Message -----
   From: Alexander Whiplash
   To: hp_agilent_equipment@yahoogroups.com
   Sent: Saturday, September 02, 2006 12:40 PM
   Subject: Re: [hp_agilent_equipment] Re: HP410C CHOPPER FREQUENCY SETTINGS FOR
50Hz LINE ? ...FIXED!!


   Wait a second. Back to back means cathode to cathode
   or anode to anode, through which you would not get any
   current flow at all. No doubt you mean this:

   ---->|--->|----
   | |
   |---|<---|<--|

   But why not just a single resistor ?

   AW

   --- hpxref <face1941@...> wrote:

   > --- In hp_agilent_equipment@yahoogroups.com, Chuck
   > Harris
   > <cfharris@...> wrote:
   >
   > > That presents a bit of a problem. In any mode
   > other than AC, the
   > probe has
   > > 6.3Vac on the filament. In AC, it has 6VDC on the
   > filament. I
   > think they
   > > are worried about cathode interface problems, but
   > from what I have
   > read, they
   > > are doing it backwards...
   > >
   > > To lower the DC filament, a couple of 1N4001
   > diodes in series will
   > do a good
   > > enough job, but the AC filament will require a
   > series resistor.
   >
   >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
   > REPLY FROM HPXREF:
   >
   > You should be able to use the diode trick to lower
   > the AC filanment
   > voltage by running a PAIR of series connected
   > silicon diodes back to
   > back... You get an AC voltage out clipped to the
   > 6.3 v ac less the
   > two forward diode drops on each half of the ac
   > cycle.
   >
   > Rgds John (hpxref)
   >
   >
   >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
   >
   > > >
   > > JOS Earthlink wrote:
   > > > Hi Chuck,
   > > >
   > > > I recall hearing that some of the early 410C
   > used the 2-01C as in
   > the 410B
   > > > and these run at 5v. Do you have any info on
   > that? I also
   > recall that the
   > > > 410C has no adjustment for the filament voltage
   > while the 410B
   > did have this
   > > > adjustment. Since it seems there are more 410B
   > HV probes
   > available than
   > > > 410C, any easy way to adjust the 410C to use a
   > 410B 2-01C probe?
   > > > 73 Jerry
   > > > K1JOS
   > > >
   > > >
   > > > -----Original Message-----
   > > > From: hp_agilent_equipment@yahoogroups.com
   > > > [mailto:hp_agilent_equipment@yahoogroups.com]On
   > Behalf Of Chuck
   > Harris
   > > > Sent: Thursday, August 31, 2006 7:11 AM
   > > > To: hp_agilent_equipment@yahoogroups.com
   > > > Subject: Re: [hp_agilent_equipment] Re: HP410C
   > CHOPPER
   > FREQUENCY SETTINGS
   > > > FOR 50Hz LINE ? ...FIXED!!
   > > >
   > > >
   > > > hpxref wrote:
   > > >
   > > > > Now, does anyone know if the fil supply
   > should be 5v or 6 v?
   > > > > (for S/N 550-06965)
   > > > > I would like to know before starting a
   > complete CAL bench
   > check
   > > >
   > > > There is no controversy here, all 410C's are
   > 6VDC filament for
   > the
   > > > 12AT7, and 6.3V unregulated AC for the probe.
   > > >
   > > > -Chuck Harris
   > > >
   > > >
   > > >
   > > >
   > > >
   > > > [Non-text portions of this message have been
   > removed]
   > > >
   > > >
   > > >
   > > >
   > > > Yahoo! Groups Links
   > > >
   > > >
   >
   >
   >
   >
   >

   __________________________________________________
   Do You Yahoo!?
   Tired of spam? Yahoo! Mail has the best spam protection around
   http://mail.yahoo.com




[Non-text portions of this message have been removed]

I have several manuals for sale for $5 each. I will
mail them at anywhere at cost using UPS or USPS. All
are original HP manuals, not copies or CDs. Contact me
off list if you are interested and tell me which ones,
and your preference for shipping.

AW

83592A Op and Service Manual (8350 plugin)
8708A Synchronizer Op and Service Manual
3466A Digital voltmeter - Op and Service Manual
1411A Sampling vertical amplifier - Op and Service
8291A, 8292A, 8293A, 8294A RF Unit Op and Service
ESA-L1500A Spectrum Analyzer Measurement Guide
1421A Timebase and Delay Generator Op/Svc Manual
1425A Sampling Time Base Op/Svc Manual
H06-1405A Dual Trace Amplifier Op/Svc Manual
3325A Synthesizer / Function Gen Operating Manual
680 series Strip Chart Recorders, Op/Svc Manual

__________________________________________________
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Excellent clean condition (possibly from lab environment or unused),
with service manual.

Has new memory NICAD, nice unit passes all selftests and functions well.

I am selling to buy other equipment.

Contact me off line

--- In hp_agilent_equipment@yahoogroups.com, Alexander Whiplash
<alexander_whiplash@...> wrote:
>
> Wait a second. Back to back means cathode to cathode
> or anode to anode, through which you would not get any
> current flow at all. No doubt you mean this:
>
> ---->|--->|----
> |            |
> |---|<---|<--|
>
> But why not just a single resistor ?
>
> AW
>
>

REPLY TO ALEXANDER FROM hpxref:======================
Hi alexander
Your diagram is what I meant. Ive always used 'back to back' in the
manner u've drawn to differentiate against 'parallelled' when
referring to diodes , particularly 'inverse paired' SCR's in power AC
controllers and input potection diodes as in the HP401C, but I'me
probably quite wrong in this, though not alone in that useage.
Why not a single resistor ?
A resistor is quite OK, but the diodes will run cooler than a
resistor  due to the diodes forward resistance being very much lower
while still producing near the required volt drops in this
application.
Result is less heat produced inside the instrument, generally a good
thing.  Whilst diode volt drop is dependant on diode forward current
and temp. to an extent, most med.power diodes of the IN4xxx variety
will drop a near constant 0.82V at 300 m/A fwd current. (this taken
from old lab notes testing 20 IN4002/4004 mixed diodes on an HP34401
DMM and and HP3487A logging voltmeter at 0.3 amp) But there's no
point looking for an exact results between the two methods as  the
6.3 v ac from the 410C supply will rarely be exactly 6.3 volt, but
will vary with line voltage.
A 'proper' AC regulator can be made with diode assemblies, either
similar to  a Cherry and Wild AC stabilizer, or just a series
resistor with (inversed paired back to back?) zener + Si diodes
across the filament, but this may draw more current than the fil
winding can supply on the 410C.
So though neither of our initial methods, resistor or diodes, in no
way provides a regulated heater current supply the main advantage of
the diodes is a reasonably constant volt drop with less heat produced
and the assembly (eg IN4002) can be heatshrink insulated  to take up
about same space as a 1 Watt resistor, (probable minimum practical
wattage rating for the 300mW resistor dissapation with 1 v drop at
6v .. and I cant buy 1 Watters at my local store any more, the next
size up being 3 or 5 Watts, the diode assembly taking up less space
than these square section 3/5 watters which my store, and maybe
yours, only stocks nowadays!
The resultant value of 'rms' diode voltage drops with AC applied and
with output going direct as truncated  ac to the filament, is
predictable enough given the other uncontrolled variables in the
nature of this application, but do use a ' true rms' responding DMM
to measure the final voltage across the tube filament and its
advisable to test the forward drop of the diode types you may use at
300mA beforehand.
The thread to which I replied (or I think I did!) was to the one
directly  below, which seemed to imply a resistor would have to be
used on AC and to a previous thread which asked for ways to reduce AC
amplitude.  The diode(s) approach is a viable alternative with the
primary advantage of producing less heat than a dropping resistor.

Cheers!
John
>
> > --- In hp_agilent_equipment@yahoogroups.com, Chuck
> > Harris
> > <cfharris@> wrote:
> >
> > > That presents a bit of a problem.  In any mode
> > other than AC, the
> > probe has
> > > 6.3Vac on the filament.  In AC, it has 6VDC on the
> > filament.  I
> > think they
> > > are worried about cathode interface problems, but
> > from what I have
> > read, they
> > > are doing it backwards...
> > >
> > > To lower the DC filament, a couple of 1N4001
> > diodes in series will
> > do a good
> > > enough job, but the AC filament will require a
> > series resistor.
> >
> >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
> > REPLY FROM HPXREF:
> >
> > You should be able to use the diode trick to lower
> > the AC filanment
> > voltage by running a PAIR of series connected
> > silicon diodes back to
> > back... You get an AC voltage out  clipped to the
> > 6.3 v ac less the
> > two forward diode drops  on each half of the ac
> > cycle.
> >
> > Rgds  John (hpxref)
> >
> >
>
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
> >
> > > >
> > > JOS Earthlink wrote:
> > > > Hi Chuck,
> > > >
> > > > I recall hearing that some of the early 410C
> > used the 2-01C as in
> > the 410B
> > > > and these run at 5v.  Do you have any info on
> > that?  I also
> > recall that the
> > > > 410C has no adjustment for the filament voltage
> > while the 410B
> > did have this
> > > > adjustment. Since it seems there are more 410B
> > HV probes
> > available than
> > > > 410C, any easy way to adjust the 410C to use a
> > 410B  2-01C probe?
> > > > 73 Jerry
> > > > K1JOS
> > > >
> > > >
> > > >   -----Original Message-----
> > > >   From: hp_agilent_equipment@yahoogroups.com
> > > > [mailto:hp_agilent_equipment@yahoogroups.com]On
> > Behalf Of Chuck
> > Harris
> > > >   Sent: Thursday, August 31, 2006 7:11 AM
> > > >   To: hp_agilent_equipment@yahoogroups.com
> > > >   Subject: Re: [hp_agilent_equipment] Re: HP410C
> > CHOPPER
> > FREQUENCY SETTINGS
> > > > FOR 50Hz LINE ? ...FIXED!!
> > > >
> > > >
> > > >   hpxref wrote:
> > > >
> > > >   > Now, does anyone know if the fil supply
> > should be 5v or 6 v?
> > > >   > (for S/N 550-06965)
> > > >   > I would like to know before starting a
> > complete CAL bench
> > check
> > > >
> > > >   There is no controversy here, all 410C's are
> > 6VDC filament for
> > the
> > > >   12AT7, and 6.3V unregulated AC for the probe.
> > > >
> > > >   -Chuck Harris
> > > >
> > > >
> > > >
> > > >
> > > >
> > > > [Non-text portions of this message have been
> > removed]
> > > >
> > > >
> > > >
> > > >
> > > > Yahoo! Groups Links
> > > >
> > > >
> >
> >
> >
> >
> >
>
>
> __________________________________________________
> Do You Yahoo!?
> Tired of spam?  Yahoo! Mail has the best spam protection around
> http://mail.yahoo.com
>

Hi All,


I have a HP 3336B that appears to hang after switch on.

I have a gut feeling its a problem with the display/keyboard.

I have a Signature analyzer and I am after the signatures part of the
service manual or even the trouble shooting section would be great!

The 3336 appears to be very similar to the 3325?


TIA,
Mark
VK2HMC.

Sorry John,
If a device drops a voltage V and passes a current I, then the power dissipated,
P = VI - no matter that it's a resistor or a diode.
And 'back-to-back' means that no current passes till you exceed the reverse
breakdown voltage, which may ruin the device.
My earlier suggestion to use a bridge rectifier is the way to achieve what you
want.
The advantage of a diode is that the forward voltage drop is much more defined
than using a resistor - sure, the voltage rises with current, but not in the
linear way it does with a resistor. Further, a resistor may not provide the
startup benefit that diodes can.
73 de Brian, VK2GCE.


[Non-text portions of this message have been removed]

Hello all.
     In my 410C, I have replaced the TO3 package power transistor with a TO3
three terminal variable voltage regulator chip. [ LM323K]  This keeps things
neat and tidy, and now the measurement diode`s heater runs on 6.3Vdc [ or 6.0Vdc
you choose which - I don`t know ], all the time. The 6Vac winding just runs the
power "on" lamp now. The 410C design is conservative enough that no extra filter
capacity is needed to do this. I think this change improves the zero setting
drift in the measurement diode, but I don`t have a spare EA53 to check this.
[BTW, I have 2 - 01C`s to swap for EA53`s, if anyone is interesed]
Cheers!...................................................Don C.


Original Message -----
   From: hpxref
   To: hp_agilent_equipment@yahoogroups.com
   Sent: Sunday, September 03, 2006 7:20 PM
   Subject: [hp_agilent_equipment] Re: HP410C CHOPPER FREQUENCY SETTINGS FOR 50Hz
LINE ? ...FIXED!!


   --- In hp_agilent_equipment@yahoogroups.com, Alexander Whiplash
   <alexander_whiplash@...> wrote:
   >
   > Wait a second. Back to back means cathode to cathode
   > or anode to anode, through which you would not get any
   > current flow at all. No doubt you mean this:
   >
   > ---->|--->|----
   > | |
   > |---|<---|<--|
   >
   > But why not just a single resistor ?
   >
   > AW
   >
   >

   REPLY TO ALEXANDER FROM hpxref:======================
   Hi alexander
   Your diagram is what I meant. Ive always used 'back to back' in the
   manner u've drawn to differentiate against 'parallelled' when
   referring to diodes , particularly 'inverse paired' SCR's in power AC
   controllers and input potection diodes as in the HP401C, but I'me
   probably quite wrong in this, though not alone in that useage.
   Why not a single resistor ?
   A resistor is quite OK, but the diodes will run cooler than a
   resistor due to the diodes forward resistance being very much lower
   while still producing near the required volt drops in this
   application.
   Result is less heat produced inside the instrument, generally a good
   thing. Whilst diode volt drop is dependant on diode forward current
   and temp. to an extent, most med.power diodes of the IN4xxx variety
   will drop a near constant 0.82V at 300 m/A fwd current. (this taken
   from old lab notes testing 20 IN4002/4004 mixed diodes on an HP34401
   DMM and and HP3487A logging voltmeter at 0.3 amp) But there's no
   point looking for an exact results between the two methods as the
   6.3 v ac from the 410C supply will rarely be exactly 6.3 volt, but
   will vary with line voltage.
   A 'proper' AC regulator can be made with diode assemblies, either
   similar to a Cherry and Wild AC stabilizer, or just a series
   resistor with (inversed paired back to back?) zener + Si diodes
   across the filament, but this may draw more current than the fil
   winding can supply on the 410C.
   So though neither of our initial methods, resistor or diodes, in no
   way provides a regulated heater current supply the main advantage of
   the diodes is a reasonably constant volt drop with less heat produced
   and the assembly (eg IN4002) can be heatshrink insulated to take up
   about same space as a 1 Watt resistor, (probable minimum practical
   wattage rating for the 300mW resistor dissapation with 1 v drop at
   6v .. and I cant buy 1 Watters at my local store any more, the next
   size up being 3 or 5 Watts, the diode assembly taking up less space
   than these square section 3/5 watters which my store, and maybe
   yours, only stocks nowadays!
   The resultant value of 'rms' diode voltage drops with AC applied and
   with output going direct as truncated ac to the filament, is
   predictable enough given the other uncontrolled variables in the
   nature of this application, but do use a ' true rms' responding DMM
   to measure the final voltage across the tube filament and its
   advisable to test the forward drop of the diode types you may use at
   300mA beforehand.
   The thread to which I replied (or I think I did!) was to the one
   directly below, which seemed to imply a resistor would have to be
   used on AC and to a previous thread which asked for ways to reduce AC
   amplitude. The diode(s) approach is a viable alternative with the
   primary advantage of producing less heat than a dropping resistor.

   Cheers!
   John
   >
   > > --- In hp_agilent_equipment@yahoogroups.com, Chuck
   > > Harris
   > > <cfharris@> wrote:
   > >
   > > > That presents a bit of a problem. In any mode
   > > other than AC, the
   > > probe has
   > > > 6.3Vac on the filament. In AC, it has 6VDC on the
   > > filament. I
   > > think they
   > > > are worried about cathode interface problems, but
   > > from what I have
   > > read, they
   > > > are doing it backwards...
   > > >
   > > > To lower the DC filament, a couple of 1N4001
   > > diodes in series will
   > > do a good
   > > > enough job, but the AC filament will require a
   > > series resistor.
   > >
   > >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
   > > REPLY FROM HPXREF:
   > >
   > > You should be able to use the diode trick to lower
   > > the AC filanment
   > > voltage by running a PAIR of series connected
   > > silicon diodes back to
   > > back... You get an AC voltage out clipped to the
   > > 6.3 v ac less the
   > > two forward diode drops on each half of the ac
   > > cycle.
   > >
   > > Rgds John (hpxref)
   > >
   > >
   >
   >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
   > >
   > > > >
   > > > JOS Earthlink wrote:
   > > > > Hi Chuck,
   > > > >
   > > > > I recall hearing that some of the early 410C
   > > used the 2-01C as in
   > > the 410B
   > > > > and these run at 5v. Do you have any info on
   > > that? I also
   > > recall that the
   > > > > 410C has no adjustment for the filament voltage
   > > while the 410B
   > > did have this
   > > > > adjustment. Since it seems there are more 410B
   > > HV probes
   > > available than
   > > > > 410C, any easy way to adjust the 410C to use a
   > > 410B 2-01C probe?
   > > > > 73 Jerry
   > > > > K1JOS
   > > > >
   > > > >
   > > > > -----Original Message-----
   > > > > From: hp_agilent_equipment@yahoogroups.com
   > > > > [mailto:hp_agilent_equipment@yahoogroups.com]On
   > > Behalf Of Chuck
   > > Harris
   > > > > Sent: Thursday, August 31, 2006 7:11 AM
   > > > > To: hp_agilent_equipment@yahoogroups.com
   > > > > Subject: Re: [hp_agilent_equipment] Re: HP410C
   > > CHOPPER
   > > FREQUENCY SETTINGS
   > > > > FOR 50Hz LINE ? ...FIXED!!
   > > > >
   > > > >
   > > > > hpxref wrote:
   > > > >
   > > > > > Now, does anyone know if the fil supply
   > > should be 5v or 6 v?
   > > > > > (for S/N 550-06965)
   > > > > > I would like to know before starting a
   > > complete CAL bench
   > > check
   > > > >
   > > > > There is no controversy here, all 410C's are
   > > 6VDC filament for
   > > the
   > > > > 12AT7, and 6.3V unregulated AC for the probe.
   > > > >
   > > > > -Chuck Harris
   > > > >
   > > > >
   > > > >
   > > > >
   > > > >
   > > > > [Non-text portions of this message have been
   > > removed]
   > > > >
   > > > >
   > > > >
   > > > >
   > > > > Yahoo! Groups Links
   > > > >
   > > > >
   > >
   > >
   > >
   > >
   > >
   >
   >
   > __________________________________________________
   > Do You Yahoo!?
   > Tired of spam? Yahoo! Mail has the best spam protection around
   > http://mail.yahoo.com
   >






------------------------------------------------------------------------------


   No virus found in this incoming message.
   Checked by AVG Free Edition.
   Version: 7.1.405 / Virus Database: 268.11.7/436 - Release Date: 01-Sep-06


[Non-text portions of this message have been removed]

Hi Don,
I do hope that you have some filtering upstream and downstream of the LM323.
Otherwise you are asking the regulator to burst into oscillation at some
indeterminate
frequency.
73 de Brian, VK2GCE.


[Non-text portions of this message have been removed]

73`s, Brian!        I think I used 0.1uF multilayer ceramic capacitors as close
as possible to the regulator itself.  Had no trouble with any instability. It
was a bit of a job getting things to look as good as the H/P assemblers, though.
Cheers!.............................................Don C.


   ----- Original Message -----
   From: Brian A Clarke
   To: hp_agilent_equipment@yahoogroups.com
   Sent: Sunday, September 03, 2006 11:22 PM
   Subject: Re: [hp_agilent_equipment] Re: HP410C CHOPPER FREQUENCY SETTINGS FOR
50Hz LINE ? ...FIXED!!


   Hi Don,
   I do hope that you have some filtering upstream and downstream of the LM323.
   Otherwise you are asking the regulator to burst into oscillation at some
indeterminate
   frequency.
   73 de Brian, VK2GCE.


   [Non-text portions of this message have been removed]






------------------------------------------------------------------------------


   No virus found in this incoming message.
   Checked by AVG Free Edition.
   Version: 7.1.405 / Virus Database: 268.11.7/436 - Release Date: 01-Sep-06


[Non-text portions of this message have been removed]

--- In hp_agilent_equipment@yahoogroups.com, "Brian A Clarke"
<brianclarke01@...> wrote:
>
> Sorry John,
> If a device drops a voltage V and passes a current I, then the
power dissipated, P = VI - no matter that it's a resistor or a diode.
> And 'back-to-back' means that no current passes till you exceed the
reverse breakdown voltage, which may ruin the device.
> My earlier suggestion to use a bridge rectifier is the way to
achieve what you want.
> The advantage of a diode is that the forward voltage drop is much
more defined than using a resistor - sure, the voltage rises with
current, but not in the linear way it does with a resistor. Further,
a resistor may not provide the startup benefit that diodes can.
> 73 de Brian, VK2GCE.
>
> Hi Brian, sorry, but I think you missed the (break)point!
The laws of physics are not being transgressed when a diode dropper
is used as discussed on AC. The diode(s) WILL run cooler than a
substituted resistor as it (to our 1st order approximations in
practical use here) DISSIPATES NO POWER (passes NO current) until its
turn on voltage, or break point is reached, where it then starts to
pass current and is only then subject to E x I = Watts. (E being
reduced due to the breakpoint of each diode in series)
A resistor, though,  dissipated power continuously past each zero
inflection of the AC sine wave.
So a diode , or diode string as discussed here, produces less heat
than a substituted resistor in this application, producing, as was
stated, a truncated AC waveform whose power is proportional to the
(now reduced) area under the curve, which is now less in area than an
equivalent resistors without that inherent breakpoint.
Further, since each diode, or diode seriesed pair, is turned on for a
half cycle only in turn, the power dissipated in each individual pair
will be only about HALF  over a full cycle, since each  pair is
sequentially turned OFF once per full cycle.  Of course , the total
power is the sum of that in both diode pairs, but each pair runs on
reduced total power dissapated due to the breakpoints.
So the total power dissapated will still be less than that of a
resistor due to the diodes breakpoints subtracting from the power
dissapated within it over that of a resistor alone.

AS an addendum, I have seen multiple seriesed "inversed paired
strings" of power diodes used a mains droppers here in WA with our
high mains line voltage (255V RMS at my workshops power points.
Its not uncommon to place a .001 uF cap across each single diode, not
just to equalise voltage across them, but to reduce 'turn on noise'
at high currents, where the sudden drop in current to zero as the
breakpoint is reached generates RF interference radiated from the
wirings distributed LC resonances.
I have came across FM repeater receivers with the aquelch totally
inoperative due to such unbypassed diodes.

In the case of 'back to back', I take yours and others  points.  I
seem to have picked up a loose term somewhere which has stuck in my
brain.
Age, I suppose.
Best rgds to you and all in group
John

Several people have contacted me regarding these
manuals. To minimize noise in this fine group I
updated the list and put it on a web page with contact
info: http://www.z9.com/HP/manuals/manuals.html

AW

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Hi John,
I'ld like to see the physics text reference that says that the diode knee-point
voltage times current flow can be considered a powerless loss.
Brian.


[Non-text portions of this message have been removed]

It's a duty-cycle issue.  He's referring to the fact that no current flows
(hence no E*I loss) during a small portion of the waveform on either side of
the zero crossings at 0 and 180 degrees.  Example: a 100V pk sine wave will
spend about 2.3 degrees per 360-degree cycle below 0.7V.  During that time,
no power is lost.  During the other 357.7 degrees, the loss is resistive as
expected.

So there would be a small improvement in thermal efficiency over a resistor,
but it hardly seems worth the trouble (and RFI risk)...

-- john, KE5FX

> -----Original Message-----
> From: hp_agilent_equipment@yahoogroups.com
> [mailto:hp_agilent_equipment@yahoogroups.com]On Behalf Of Brian A Clarke
> Sent: Sunday, September 03, 2006 1:36 PM
> To: hp_agilent_equipment@yahoogroups.com
> Subject: Re: [hp_agilent_equipment] Re: HP410C probe heater regulation
>
>
> Hi John,
> I'ld like to see the physics text reference that says that the
> diode knee-point voltage times current flow can be considered a
> powerless loss.
> Brian.
>
>

Though the time that current is flowing through the
diode is slightly shorter, it also has to be slightly
higher than it would be in the resistor. This is
required in order to achieve the same RMS current into
the heater. So there is no savings just because the
duty cycle is reduced.

AW

--- John Miles <jmiles@...> wrote:

> It's a duty-cycle issue.  He's referring to the fact
> that no current flows
> (hence no E*I loss) during a small portion of the
> waveform on either side of
> the zero crossings at 0 and 180 degrees.  Example: a
> 100V pk sine wave will
> spend about 2.3 degrees per 360-degree cycle below
> 0.7V.  During that time,
> no power is lost.  During the other 357.7 degrees,
> the loss is resistive as
> expected.
>
> So there would be a small improvement in thermal
> efficiency over a resistor,
> but it hardly seems worth the trouble (and RFI
> risk)...
>
> -- john, KE5FX
>
> > -----Original Message-----
> > From: hp_agilent_equipment@yahoogroups.com
> > [mailto:hp_agilent_equipment@yahoogroups.com]On
> Behalf Of Brian A Clarke
> > Sent: Sunday, September 03, 2006 1:36 PM
> > To: hp_agilent_equipment@yahoogroups.com
> > Subject: Re: [hp_agilent_equipment] Re: HP410C
> probe heater regulation
> >
> >
> > Hi John,
> > I'ld like to see the physics text reference that
> says that the
> > diode knee-point voltage times current flow can be
> considered a
> > powerless loss.
> > Brian.
> >
> >
>
>


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i  think  a  properly  mounted  resistor  is  the  solution
   ----- Original Message -----
   From: Alexander Whiplash
   To: hp_agilent_equipment@yahoogroups.com
   Sent: Sunday, September 03, 2006 5:36 PM
   Subject: RE: [hp_agilent_equipment] Re: HP410C probe heater regulation


   Though the time that current is flowing through the
   diode is slightly shorter, it also has to be slightly
   higher than it would be in the resistor. This is
   required in order to achieve the same RMS current into
   the heater. So there is no savings just because the
   duty cycle is reduced.

   AW

   --- John Miles <jmiles@...> wrote:

   > It's a duty-cycle issue. He's referring to the fact
   > that no current flows
   > (hence no E*I loss) during a small portion of the
   > waveform on either side of
   > the zero crossings at 0 and 180 degrees. Example: a
   > 100V pk sine wave will
   > spend about 2.3 degrees per 360-degree cycle below
   > 0.7V. During that time,
   > no power is lost. During the other 357.7 degrees,
   > the loss is resistive as
   > expected.
   >
   > So there would be a small improvement in thermal
   > efficiency over a resistor,
   > but it hardly seems worth the trouble (and RFI
   > risk)...
   >
   > -- john, KE5FX
   >
   > > -----Original Message-----
   > > From: hp_agilent_equipment@yahoogroups.com
   > > [mailto:hp_agilent_equipment@yahoogroups.com]On
   > Behalf Of Brian A Clarke
   > > Sent: Sunday, September 03, 2006 1:36 PM
   > > To: hp_agilent_equipment@yahoogroups.com
   > > Subject: Re: [hp_agilent_equipment] Re: HP410C
   > probe heater regulation
   > >
   > >
   > > Hi John,
   > > I'ld like to see the physics text reference that
   > says that the
   > > diode knee-point voltage times current flow can be
   > considered a
   > > powerless loss.
   > > Brian.
   > >
   > >
   >
   >

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[Non-text portions of this message have been removed]

The filament is going to run cooler (lower RMS voltage/current) in
both scenarios because in both cases you have added a series
resistance.

The heater is not actively monitored/regulated. All you have for
temp regulation is the dynamics of the filament itself.

There's no reason for the power source to compensate for the series
diode/resistor losses so the RMS will be lowered proportionately.

If the filament temp were actively regulated, the supply would be
called on to provide a higher RMS to compensate for the series
losses.

The diode provides a minimal savings in heat because it is non-
conducting for brief parts of a cycle. Just need to add a bypass cap
for rfi reduction/prevention.
rtc

--- In hp_agilent_equipment@yahoogroups.com, Alexander Whiplash
<alexander_whiplash@...> wrote:
>
> Though the time that current is flowing through the
> diode is slightly shorter, it also has to be slightly
> higher than it would be in the resistor. This is
> required in order to achieve the same RMS current into
> the heater. So there is no savings just because the
> duty cycle is reduced.
>
> AW

Boy,
We're really getting into wanker-based research, now.
Can we go back to physics and electronics, please?
Brian.


[Non-text portions of this message have been removed]

At 07:56 PM 4/09/06, you wrote:
>We're really getting into wanker-based research, now.
>Can we go back to physics and electronics, please?

Mate can we keep the language civil, references to masturbation
are not helpful and show you up, not the participants of the discussion.

The discussion about resistor vs diode has been resolved, there is no
place for lowering the tone,

thankyou

Mike



>Brian.
>
>
>[Non-text portions of this message have been removed]
>
>

Regards

Mike
* GMC/VK/VL Commodore & Calais FuseRail that wont warp or melt !
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[Non-text portions of this message have been removed]