HP produced a number of application notes, booklets some 20 pages each, covering spectrum analysis, phase noise measurements, noise figure measurements etc. in the 60s and 70s. They are easy to read a

Hi, in the archives there is a list of suitable loads for this PS when disconnected from the scope. Göran [Non-text portions of this message have been removed]

Hi, I dont understand how to search for files in the new tool. However make a search on my name "gorankrusell" and I think you will find it. It was "hakan" who scanned the file long time ago. Göran [N

Thanks Vince, I got it. The file is "7k_PS_currents .pdf" and it is in "arc2". Göran

Vince, I think your last comment is correct. I suggest that you change all capacitors that could be a problem now or in the future. Göran [Non-text portions of this message have been removed]

I dont think so but what you shall do here is to measure the output current from this supply and figure out if it is reasonable or way too high. Göran

Vince, Follow Jerry´s good ideas! First you need to determine if the -15 V supply is good or not. Is it possible to disconnect the load also including the sense line as well, and then see how it behav

Dennis is right! In Europe we have a difficulty with for example "pound force per square inch". When checking your car tire pressure at a gas station you may need the conversion 1 psi = 6,8948 · 103 P

Hi, can anyone tell me why there is a need for very high resolution voltmeters having 5½ to 6½ digits. What are the applications? Thanks Göran

Hi David, I enjoy using LTspice for analog designs and it is for free. Easy to learn and works quite well. However I have learned that your design has to be fairly small, something like 50 components,

I would guess someone in Texas! Göran [Non-text portions of this message have been removed]

Hi Teacher I know it! the first equation should be Rt = R1 x R2 /(R1 + R2) and when solving for R2 we get R2 = 1/(1/Rt - 1/R1) Göran

Hi Ian, A JFET is often used at the input of an amplifier and operates as an impedance converter (Q201). The gain is close to unity and therefore the JFET is not very demanding when it comes to freque

Dont ask for a refund. Try to repair it instead! You will get the help you need from this group. Good luck! Göran [Non-text portions of this message have been removed]

Also check out hp8647a. Not as low phase noise as 8640b though. Still useful. Göran

Hi, you may check my contribution under "gorankrusell" and file #46107. It might give you some hints, hopefully. Good luck Göran

Hi, your replacements should be okey. The multiplier creates +21 kV to the CRT anode. My guess is that the (bad) multiplier itself caused the capacitor C1371 to blow up. Then you replaced it with a NO

Hi, years ago I experienced drift in my 7904 and it was caused by one of the vertical channel switch ICs on board A7. After exchanging the board the drift was no more. Göran [Non-text portions of this

Hi Jim, check this link for a manual http://bama.edebris.com/manuals/tek/ You may have a problem with the Readout board. Göran [Non-text portions of this message have been removed]

Hi, this has to do with the relative vertical positioning. You can shift one channel and the jitter will move to the other signal. This has to do with the amplifier recharging for the new signal to tr