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I would suggest that you start with the basics. Check the power supply voltages, noise and ripple. Very likely due to the age, the filter capacitors are weak. Any noise will disrupt the logic in the

Is that spring the reason why the buttons on my 3456A have such a sharp tactile action when I press them? Is that abnormal and can that be alleviated? The seem overly noisy and hard to press. Thanks,

Hi Martin, The easiest thing is to find the spring that fell out. It is sticky with grease, so it will often stick to something. If it is in the instrument, you must find and remove it, as it can

I got a 9915 computer which uses the same leaf-spring loaded front panel buttons as many older HP instruments (/e.g. the 3456A DVMs). Three of the springs have fallen out and I need to fix that. Are

Hi. In the process of fixing my 8901A that got beat up by the carrier, I have found what I think is a problem in the fault finding section on the GPIB board. Could someone with a 8901A please input

A direct plugin solution seems to be difficult. The grounding of MMICs is quite critical and maybe you need to do some surgery on the circuit to connect a daughter board that can be properly grounded

Hi Steve, you need to start at the main oscillator and make your way down the signal chain. You need an oscilloscope and a frequency counter for this job. Follow the block and schematic diagrams in

Hi, I am controlling my HP34401A multimeter via GPIB with a Prologics adapter, which works quite nicely. My only problem is that the measurement speed it rather low at about 1 measurement per second.

Even worse, now the frequency counter shows all zeroes, plus "overflow". none of the counter buttons have any effect. The RF output does exist, and the amplitude knobs both work. AM and FM modulation

I need help to fix the HP 8640B freq. lock. The output freq. wobbles greatly and will not hold onto any frequency as set by the cavity dial. Any help would be appreciated. I have downloaded some

Thanks for the great replies! Some have tried to identify the original part, but none of the parts matched exactly. The Avantek came closest, but these are apparently no longer available with

I spent years hunting for one of these before I found one, so I just thought I?d email this out in case anyone is looking for one. I don?t know anything about the seller, but it looks like its in

Now I got curious and had to look at the schematic. It looks like almost any small-signal Ge diode or even a transistor junction would be a drop-in substitute. Looking at the parts list, it's clear

Hi Joe, I have GPD-402 and GPD-403. Tose guys can go till about 800MHz; for 402 gain drops from 14dB at 100MHZ to 12dB at 800MHz. For 403, 12dB at 100MHz to 8 at 800MHz. But i think you need GPD-1001

This part is used in a HP 606B signal generator in the A4 oscillator amplifier assembly. It's in the cathode circuit of the differential amplifier. The differential amp provides a DC signal to the

What is the function of this diode in the circuit? If it's just a rectifier or low speed signal diode, you should be able to replace it with silicon easily, or with a Shottky diode or rectifier if

Is there a commercial/milspec equivalent for the HP 1910-0016 which is listed as a Ge diode 100mA/0.85V 60 PIV. Sphere has them @ $6 each, but the shipping from Canada is so expensive. This part is

[hp_agilent_equipment] <hp_agilent_equipment@...> wrote: I don't know that particular schematic, but I always try to test logic ICs out of circuit after I remove them, to be sure I'm not

Hi all readers, Just wanted to inform that I have managed to repair my HP3585A 40 MHz spectrum analyzer with : keyboard no reaction (all LEDS lit) and no display on CRT. Following the manual Fault

A small OT hint: The same goes for the output amplifier in the old 8640B.I replaced that one with a MiniCircuit MMIC. Had to disconnectthe +40V and use an external voltage regulator though.Just watch