I just want to share the score that I did with this arbitrary waveform generator that wasn't working properly.
It failed at amplitudes from 1Vpp to 10Vpp. Also, it failed the self-test, the seller told me that it just freezes when running the self-test.
I ran the self-test at night and next day it showed that failed the self-test with these two errors:
629: +20 dB amplifier path
630: Internal ADC overranged during one of the above tests
With this information, I decided to fix it, I found it quite easy to open it, a few screws and that's it.
It has a lot of passives in the bottom side and a lot of ICs in the top side, the power supply has its own board and apparently it wasn't design by Keysight.
I found the service manual and I started debugging it.
This table show what attenuators and/or amplifier is used in the different ranges.
The hybrid amplifier is used for the higher amplitude ranges. I was a little scared that the hybrid amplifier was damaged, and the AWG was done.
I started pocking around the inputs and output of the hybrid amplifier.
When I place the probe in the pin 6 (-INP) the output it showed the correct amplitude.
Basically, the pin connection wasn't making a good connection.
I pushed the pin just to be sure that it's doing a good connection with the hybrid.
Now it's working and it passed the self-test.
