New acquisition: [(
hp)] 34401A 6 1/2 digit bench multimeter
Also part of the same Craigslist buy. I couldn't get it to read an AC measurement or a frequency measurement but I didn't bring anything and I had limited equipment/time available to test with. I should really buy one of these small multimeter calibrators. I could bring it on shopping trips with my Fluke 87V DMM and it would probably pay for itself
after a few Craigslist buys.
The Bad:* Does not make measurements when in AC or Frequency modes.
* Fails self-test with the following errors:
620 - AC rms zero failed
621 - AC rms full scale failed
622 - Frequency counter failed
* No folding bale
* VFD is dim
The Good:* Everything else seems to work.
* Looks like it was calibrated in 2010.
* I paid USD66 for it.
* It's in good nick (appearance-wise)
* Came with rubber baby buggy bumpers
* All VFD elements work. Can you turn up the brightness? (I'm going to RTFM...)
* I had to tear old cal stickers to uncover case screws and pull case off. The dangerous idiots haven't been inside it, yet. Here I come!
Revision code on this unit is 05-01-01. The most recent date code I found in it was '95, so I'm going with that. I found a couple of components that look like they had been the victims of Zeus' wrath: an ex-capacitor, and the Zener (in the TO-236 package) next to it. I've already downloaded the service manual. ...reading a little bit... oh, brother. That cap filters the -15V rail for all of the transistors and an obselete IC (AD637JR) in the AC section. If all that silicon got damaged this unit is headed for ebay "For parts or not working".
Is there anyone on the TEA forum that doesn't know what this meter is? Here you go, sir or madam:
https://www.keysight.com/us/en/product/34401A/digital-multimeter-6-digit.html