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Thanks. Looking forward to that. Raymond

I have a special pleasure: I need a picture from the inside of the PSU of hp 8593A, the board with the UC3844? , there is, or was ... I see nothing ... a C13 what is connected to pin6 of the UC3844 ,

Thank you for the input. I'll try cleaning as suggested , the service manual describes the details about the relays, so I'll keep you posted. Goran

Would anyone have a HP 651B test oscillator OP/SVC manual covering serials around 1200A and later (1980’s manufacture)? All of the ones I can find are referring to serials in the very early range of

Wojciech, Since the 8566B switches between band 3 to band 4 in the upper band at 18.5 GHz and the 8341B/8340B switches at 20.0 GHz, I would say it is pretty conclusive it is the 8566B that needs

Glad I am not the only one with similar issue....LOL Renée

Excellent! Better than not mispelling in only one! Renaud

Yes, my spelling sucks, that's on me.? As a bonus, I can misspell things in at least 3 languages. Rich - I am a little confused regarding the GoTek options.? I am seeing lots of these drives on

Thank you for your reply. I just went and made some quick measurements. J2 (LO out) is at +13.78dBm on my power meter, and the sweep from 292-355 MHz looks good on my spectrum analyzer. With a 2GHz

I guess I should clarify: The relays are an open construction: Their switching contacts employ the gold-plated PCB pads. Once you see it, it'll become clear. Raymond

Hi, First, I did the spurious comparison by measuring directly at input 1 of the 5350B, but I don't have an external 10dB attenuator. It's clear that you have much more spurious than my 8350B. I made

The 3325A uses latching relays in its attenuator. These are mounted on the PCB and held with springs. The contacts between relays and PCB are prone to becoming dirty after many years. Remove the relay

Just noticed that some of the amplitude levels are not correct on my HP 3325A that worked without problems for a long time. So before starting anything I wonder if anyone has experienced something

Yes, it is the same supply!

Hi Yves, Yes, my PSU is a 0950-2211 and I'd be interested in your experiments. It'd be nice if we could come up with some methodology to verify these things. regards Tim

OK. Not a fan of fine pitch :) But I will try to use the pods from my Agilent 54622D with the 32-ch analyser and see if it works. They have a straight 2,54mm pitch IDC connector.

Hi, I don't have a 54720A, but an 83480A, similar to the 54750A. After checking the 54720A service manual, it seems that the power supply is the same. My question is: is the power supply of the 54720A

Hi, Greg, I'm Andrea, IW2FDH, from Italy, Could you please post the? schematic of the HP 8980a/8981a power supply ? Even without the removable vertical control board thanks in advance

I have worked on many 54720, and the power supply is always the culprit of most issues. I was never able to find the schematic of that power supply!

Hi all, My 54720A comes on briefly before switching itself off. No modules in frame. Been through section 5-12 of the service guide and I have all rail LEDs green and then LED1 on and LED2 off. Its