Hello,
I'm still struggling with 2445A calibration. Good news - I have completely repaired and calibrated TG501. Bad news - I don't have neither the tunnel diode pulser nor the PG506 and I don't really know whether I can do w/o these units.
For the vertical calibration I pretty much only need a some sort of AWG, IMHO. I do possess HP8175A with the option 002 (analog 50 MS/s AWG) which can drive up to 16V into 50 Ohm load.
I assume that the standard amplitude signal required for the 2445a is 1KHz positive polarity (DC coupled) with selectable amplitude.
Yet one more problem to be solved. I had to change the channel 1 hybrid and its from a different scope : 2465a. The seller told me that the hybrid will certainly work after recalibration. However, the trigger AUTO LVL function doesn't find the signal level on the channel 1 (there is a large offset in the auto level measurement). Otherwise the channel 1 works fine.
Does the CAL03 TRIGGERING procedure takes care of AUTO LVL trigger function and adjusts the offset in the ADC algorithm?
If someone could also explain for CAL01 where to overlay the B delay sweep signals (in the center of the screen over the 6th vertical line or anywhere on the screen for all the steps but step 1), this would be awesome.
Thank you,
Best regards,
Maxim
