Electronics > Repair
Repair : HP 3245A precision DC/AC source
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TiN:
ACV.. Hmm, that's interesting, I'll run noise script modified for ACV, just like we did on DCV before.
What AC mode should I use? Not familiar with them yet.
TiN:
I think better late than never. Here's repair video and some testing. Hope you will not be bored.



Also took a closer look on source board... Guess what, DAC was replaced before. Somebody did not bother cleaning flux  :--



Little lumped inductor made me smile:



Don't you love it?

Voltage reference upgrade



Good bye, good old HP-marked LM399...



Added pair of coax wires instead. What was heater power now becomes LTZ module power. What was zener diode, now is Kelvin-connected LTZ1000ACH output (different module used, not the exact one from photo). Took photo with older module since it's the only one without insulation wrap around..



Removed resistors R400 and R401, as these not needed anymore. Unit is powered and hooked to DMM to log output. It's out of cal ofcourse, but no big deal, as we recalibration is easy with just 3458A.



Here's warmup graph, 40 minutes span. It's slow and ramping...

Vgkid:
Impressive
ManateeMafia:
Wait until you see the next project. Fluke 87V with LTZ1000! :) Don't ask about battery life.
TheSteve:

--- Quote from: ManateeMafia on November 13, 2015, 10:05:48 pm ---Wait until you see the next project. Fluke 87V with LTZ1000! :) Don't ask about battery life.

--- End quote ---

The best 4.5 digits of your life!
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