I know that this is not an HP, but maybe somebody on this forum has experience or schematics of the power supply assy on this instrument. I would be very...
... reverse power protection assy. ... Hello Elie. Thanks for your guideline and makes lot of sense. I have measured the level just before the reverse power...
Hello to all. Found a deffective reverse power module on the generator. Doesn,t track the selected power. Looking for a good used or new module assy. Or any...
I have no idia how to repeir the Reverse Power Protection (RPP) and the attenuators assy. The attenuators and the RPP are builded with PIN diodes, no...
Hello Elie Have took the assy appart and not much that can be serviced in there without affecting the operating characteristic. The main problem remain. Any...
Try Test Equipment Plus ( http://www.testequipmentplus.com ). They repair and refurbish HP step attenuators, and probably can help with the 8657A's output...
Group, The HP step attenuators can be refurbished and/or repaired. NSCA Technology sells refurbished ones, and Tra-Cal lab repairs them every day. I believe...
... Steff, if I remember it correctly, the reverse protection module contains a reed relay, mounted on an alumina substrate. Delicate stuff, but not impossible...
another simple idia, if reverse power protection is not absolutly needed you can by pass the rpp. [Non-text portions of this message have been removed]...
... needed you can by pass the rpp. ... Yes, it can be done i believe but that will be a one shot deal on the attenuator if a mistake is done. But at least i...
Does anyone have a spare power supply board or crystal oven for the EIP 545 counter that they will sell? My recent purchase is supposed to have opt 05 but is...
I do not know about the 545, but I have two EIP 371 Source Locking counters, one with the OCXO the other without. The one with the OCXO does not have the ...
Thanks Didier, I have just printed out the manual and will look over it tonight. I noticed a separate power supply for the OCXO, I had thought it would be on...
Anyone with a want to sell or trade one of these? Also looking for APC-7 to female type-N adapters and female type-N load (909F)from 85032B cal kit. Regards, ...
Hello group, I have a faulty 8558B SA, so far the most noticeable problem is the LED frequency display is way out, it displays often as much as 20 MHz ...
francesco messineo
francesco.messineo@...
May 2, 2008 7:32 am
13490
... Actually I just found that the third LED figure from the left never changes when tuning around. It changes each time freq-cal is pressed but then it...
francesco messineo
francesco.messineo@...
May 2, 2008 7:38 am
13491
Eric I *might* have both of these (or neither) not certain. I'm not at home at the moment to check. I don't use N calibrations much. Glenn n6gn...
The frequency read-out actually is a voltmeter. It reads the oscillator tuning voltage, and is corrected by a network to give a linear voltage verses...
Hello, The counter will not work without an oscillator, I do have an EIP 545 with options -02-05-08 ( OPT. 2, Power Meter: 1.0 to 26.5 GHz Power Meter,...
Is the AUX output level supposed to be constant or frequency dependent? Could someone measure their output at say 25 and 50 MHZ? Mine drops to about half going...
Silly question - what's the bandwidth of the 'scope? ... From: hp_agilent_equipment@yahoogroups.com [mailto:hp_agilent_equipment@yahoogroups.com] On Behalf Of...
Aha! When measuring across a 50 ohm load, it's all better. The BW of the scope is 100 MHZ (its a R7704 with the 7A26 plug-in) Thanks, I'll go blush now:) ....
Dave, I don't know if all versions can have the GPIB retrofitted, or not. The one NSCA has in stock HAS the GPIB installed from the factory, as well as the...
I have a bunch of Microwave power devices for sale: HIT1920-10 10W 1.8-2GHz 28V HIT1920-30 30W 1.8-2GHz 28V MRF1980 75W 900MHz 28V PTF10019 70W 800-960MHz...
I am just now getting around to implementing protective measures on my HP 6255A PS. As I understand it, there are situations which can destroy components in...
Dave EIP 545/548 The standard oscillator is on the Gate Gen PCB No A107 When one of the options 03,04,05 installed the oscillator is removed from this PCB...
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