Very old lcr meter - Page 1
Forum section: electronics / testgear

author: MarcusFunt
author_rank: Contributor
timestamp: May 22, 2022, 03:49:36 pm
content: I recently got a very old lcr meter for free. but even after reading a manual i found on Google, it still makes No sense to me.Does anyone know something or can lead me to someone who does?-13yo hobbyist from Denmark

author: bob91343
author_rank: Super Contributor
timestamp: May 22, 2022, 04:43:36 pm
content: Nice! Does it work?

author: DeepLink
author_rank: Regular Contributor
timestamp: May 22, 2022, 05:05:14 pm
content: Nice instrumentTry to test it with a known resistor (i.e. ~5k Ohm)Set the range switch to 10k Ohm rangePress "R" and adjust the dial (upper right corner) for a center reading on the left meterRead the resistance on the top scaleAs a fellow Dane, feel fre to contact me if you need guidance in Danish langue/Hans

author: MarcusFunt
author_rank: Contributor
timestamp: May 22, 2022, 05:21:04 pm
content: I tried doing as you said, but Nothing happened.I tried looking in the back and found something about some external bias?

author: MarcusFunt
author_rank: Contributor
timestamp: May 22, 2022, 05:23:40 pm
content: The back of the device

author: TimFox
author_rank: Super Contributor
timestamp: May 22, 2022, 05:36:31 pm
content: Nice looking instrument. Questions:1. If you can find a manual, does the "external bias" need to be shorted when not in use?2. I don't see a switch on the front panel for internal/external AC source: does it require an external generator? I own some Wayne-Kerr and General Radio bridges that do not have an internal generator.

author: bdunham7
author_rank: Super Contributor
timestamp: May 22, 2022, 05:53:44 pm
content: https://bama.edebris.com/download/philips/pm6302/PM6302.pdf

author: TimFox
author_rank: Super Contributor
timestamp: May 22, 2022, 06:00:43 pm
content: Interesting. The manual discusses connecting an external AC or DC supply (the latter must be a battery), but I couldn't find anything about switching between internal (100 or 1000 Hz, depending on range) and external generators.I keep forgetting that younger people no longer learn how to balance a bridge, since everything is digital. The manual does tell you how to adjust the setting (as indicated on the moving pointer) to get a minimum on the small meter.

author: strawberry
author_rank: Super Contributor
timestamp: May 23, 2022, 04:35:00 am
content: schematic tell : in R mode switch 801A to internal DCV source- only C mode could get AC source and external DC offset for ceramic capacitors ... otherwise external bypass short must be usedclean silver oxide from switch contacts with IPA and protect with dielectric lube - and you will get stable results from instrumentmeter use choper amplifier - cool

author: Wallace Gasiewicz
author_rank: Super Contributor
timestamp: May 23, 2022, 11:20:32 am
content: Are those spring push connectors in your first photo?I wish I had a few, if that's what they are.My Genrad LCR Bridge has bias connectors. Not necessary to connect them.

author: graybeard
author_rank: Frequent Contributor
timestamp: May 26, 2022, 12:25:56 am
content: Quote from: Wallace Gasiewicz on May 23, 2022, 11:20:32 amI have had six of those push connectors many years. I don't remember where I got them, but I use them regularly.