Ok I have just cleared all that flux mess and 1Ghz vent away.
And Ch2 is in good shape. Even Ch1 shows some vitality signs.
1 It shows waveform on all frequency ranges correctly and correctly measures frequency
2. at some attenuation ranges it shows proper voltage and waveform amplitude. but at some it looks like signal is pulled down, but devider approximately changes accordingly.
Here is table of signal taken from probe compensation (sorry my signal gen somewhere buried in boxes waiting my new lab and bench)
Volts/div | Vpk-pk |
50 | 3 |
20 | 2.6 |
10 | 2.6 |
5 | 2.6 |
relay switches |
2 | 2.5 |
1 | 1.38 |
500m | 690m |
200m | 300m |
100m | 170m |
50m | 88m |
20m | 125m |
So as you can see on range 1Volt/div it starts fooling around.
I have to thoughts
1. Attenuator/amplifier (Agilent 1BN7-8453) is baked at least one its part.
2. Some passive component dragging signal down.
If someone have any ideas please?
Next step it to check simple components some resistors or caps around acquisition block relays and amplifier/attenuator
But already looking for Agilent 1BN7-8453 on sale because Murphy law will get ya