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Hello Ulf. For the 115V types found in instruments like the 3314A, I'm also using Papst all metal versions with similar pressure and flow performance than the original, just to be on the safe side. I

Greetings, gentlemen, Earlier today I was trying to establish the resonant frequency of a tank circuit I'd put together. A simple enough task, you might think - as indeed it should be! Now since I was

Yves, Thanks for the elaboration, you clearly know a lot about these machines! The probe I used was an old Agilent N2862A 10M // 15pF probe, so that's rather high capacitance compared to yours, that

On the flowchart in the service manual when PROT lights it should also show OV, OC, RI, or FS. Then follow the troubleshooting chart. This is also a current sink supply, so you should be able to

Hello Olaf, Glad to help, to the best of my knowledge ;-) Br. Antoine

I have had excellent results using NOCTUA fans (type NF Premium Quiet Fan). See noctua.at Can be purchased locally in Scandinavia. Allan

The RF signal goes through the 3 converters and then goes to the A11 filter module, then to A12 Amplitude control, A13 filter. At this point we have the AUX IF signal available at the back of the

I've replaced a couple of fans in HP equipment, and I personally looked for units that would present a CFM value - meaning to me they have some consideration for the critical part of their performance

Another thought: Many "muffin style" fans can be speed-controlled with a PWM signal. So, consider adding a small board with a 555 chip so that you can adjust the speed for optimal airflow with minimum

Before retiring from HP, choosing a fan type was handled by the Mechanical folks (I wrote firmware to manage fan speeds and cooling). However, I can say that Nidec was a brand that we used a lot in

Forum, Part of instrument repair and refurbishing I am most often faced with having to replace old worn out fans. Recently, repairing an old 8663A Signal generator, the old fan had to go. Being

Yves, In the meantime did some additional checking. I figured the biggest difference seemed to be in the TP1 temperature voltage. I did a simulation of the circuitry but both our tp1 voltages seem to

Hi there; Bad proactice to connect a battery to a linear PSU without consideration for reverse current and damage. We use series power R and diodes. I do not have 6632B but have many similar HP . Most

OMG! I didn't know they actually had prices on their website! $16'ish for a 0.5W, or $13'ish for a 0.3W custom resistor, .2ppm, 0.01%

Thanks everyone, and especially Radu for the info on TCC!? Definitely a resource for me to bookmark. I did substitute the resistor using a 15K and 820 ohm resistor in series from my parts bin,

Hello all… You guys have always had the experience to assist. After years of service, my 6632B Serial number: US36351432 version: A3 from PCB, has failed. Here are some details. I was

I discovered them when looking for some top shelf resistors for a voltage reference (hobby metrology grade) based on the LTZ1000(A), where the lift-up to 10V relies on a very stiff pair of resistors

That is really excellent info! The pricing is not unreasonable for what is basically a one of a kind part. Thank you very much for that information. Don Bitters

Just looked at the data sheets - nice. I had never heard of this outfit. Will keep info for future reference.? Ed

Radu, that's a great deal then for one-off. I haven't looked for such things in a long time. Ed