Hello group. I have a non-optioned 8644B (1030 MHz) and found a doubler kit to 2060 MHz. After installing, the unit fails calibration and self test with error 6,040,117. Manual says attenuator issue (designated by the 6,040 result). Not exactly sure
what this indicates as I know the output attenuators are OK (and not even tested, really).
The output seems OK up to 2060 MHz, although perhaps a bit low. (by 1 or 2 dBm)
Is the doubler defective? Are there any adjustments or hints to find a hardware failure?