Author Topic: HPAK 54845A fails calibration with "tail adj"  (Read 1250 times)

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Offline Jwalling

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HPAK 54845A fails calibration with "tail adj"
« on: October 28, 2019, 06:21:02 pm »
Never seen this failure before. Scope is now repaired. It had a bad A150-0005 RF relay in the attenuator which was causing problems @ 20mV/DIV and below and was replaced, then after repairing the attenuator it was getting this error. Turned out to be a bad A/D converter. I'm curious if anyone has any insight as to what "tail adj" means?

The affected channel appeared to be working perfectly, otherwise.

System error. Strike any user to continue.

Offline JDubU

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Re: HPAK 54845A fails calibration with "tail adj"
« Reply #1 on: October 28, 2019, 06:55:03 pm »
Maybe there is an adjustable current source in an input differential amplifier?

See "Long-tailed pair":
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