Hi Dean, First, check if the 10 MHz reference oscillator is up to temperature. Touch it with your hand to confirm that the heater is on. If the reference is...
Hi, You might check the 1N5139 6.8pF Varicap on the A7A2CR-1 on the 100MHz VCXO card. It looked like a diode, no capacitance. The diode is used to tune the ...
When you say the "VCO apparently stops," I presume you mean that the control voltage hits the limits, so the loop doesn't oscillate - not that the 100 MHz...
I have a pdf manual for the 5245L counter but unfortunately the page showing waveforms (around p. 230 or so) was apparently miscopied. There are evidently two...
I don't know what manual you have but neither of my manuals, operating or service, has any such references. Which section? Most of the service manual is...
Hello all, Before starting to modify all adjustments, .... , the best way is to verify 10 Mhz ref. Normally if you have strap a rear panel you can read (if you...
"Almost impossible"? Horsefeathers. ISTR that some of the gears are replaceable by standard parts from the likes of McMaster-Carr. At least one person has...
DRM I Have an original manual sitting here. So help me clear up a little confusion and maybe I can help you 1) The page number 230 is meaningless as that is a...
Looking for the A5 EVENT board, part number 05372-60005 On the A5 board, A5U41 IC Zero Dead time counter, HP house part number 05372-60005 is bad. Thanks, Jon...
I hope this isn't too far off topic. I think I was almost scammed today. I submitted an offer on an 8640B to "techcorner2009" which was countered. I...
This may be o.k. Have you talked to the seller? If you look at the history of the sellers ID, you see that it was talented2 until 06 May 2012. I have had to...
Hmm. Do their fees change if you're a large or established seller? I just got a response from the original id and he says it's OK, so what do I know? I...
Hi Tim, Are you interested in an analog scope, a DSO - or are you open to either possibility? Dual trace or four channel? What is you financial pain threshold?...
Jay, Following the thread loosely and being entertained by fixing things, I 'bit' and got this unit. The display was dead and when I do the 'Key-Down ...
Oops! Also found U617 in a socket, an Actel 1010A in a PLCC44 package, with a label of 'TIMETAG COUNTER 6/24/92'. U101 may also be socketed, a MC68EC020RP25. ...
Hi Joe, I've fixed a number of these scopes. Replacement batteries are not too hard to find. You *could* get any battery that's the proper length and voltage, ...
... Either.... but I've been looking at 54720A's & D's and 54542A's also the 54111D looks attractive. Part of the problem is that while the $ value of some of...
I seem to be in the middle of this discussion but my situation sounds relevant. I just added a DSO to my lab. I have a Velleman DSO that connects to my laptop...
It took a while to find the exact battery (17 mm dia, 45 mm length, 3 pin solder connection, 2 pins for +, 1 pin for -) although the part number appears to be...
First: Thanks. The one waveform page I have (containing 1-11) appears in my pdf copy after the first of several images of page 7-37. But the physical structure...
DRM The rest of the waveforms are on pages 6-13 through 6-15 in the section 6: "Adjustment and troubleshooting" Dave Artekmedia ... -- Dave& Lynn Henderson ...
This is better and a lot cheaper. http://www.mouser.com/ProductDetail/Tadiran/TL2155-PT-COMP-201-3/?qs=rNZh4F5RthSMuG5LqorOwg%3d%3d 2/3 AA Yours may be an AA...
Dean, I'm not an expert on the 8566 100 MHz PLL, but the sweeping sounds like the loop tuning the VCO around looking for lock. I think you need to get a good...
Yeah, the AA is about 50 mm long. Maybe you could use a 2/3 AA with wire leads. The two positive pads might need to be tied together. Stick a piece of double...
Maybe someone knows where to get the "HP ScopeView PC software"? Is there any another option to transfer images via RS232 from 54520a? Intuilink Screen Capture...
... That's a good sign. ... Hi Joe, From looking over the other threads it looks like you're all set on the battery sourcing. I prefer instead to add wires to...
