About the Radio-Shack (Tandy) 22-175b multimeter

Gaetan Mailloux · 2007-11-30T15:35:15+00:00

HelloI have a Radio-Shack (Tandy) 22-175b digital multimeter.Wen I use it to measure capacitors it do not do it's 0 before measuring,even without any wires plug to it there is alway a .1 nf reading, there isonly two trimpots on the pc board, how can we reajust to have 0 ?Any body would have the schematic diagram for that meter ?ThankByeGaetan

Nov 30, 2007 22 Replies

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GregS 18 years ago

I guess you didn't get it. If you did like I say using a connector board combination to get rid of the leads, measuring should be no problem. As long as the .1 nF is constant. It seems your display goes to .001 nF like my Fluke 189.

greg

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Gaetan Mailloux 18 years ago

Hello

I just found a Metex DMM with capacimeter foction and a zero buton, so I can do a zero with any lead I would use or wen I use the socket. It's work since I did measured a 15 pf capacitor with 5 % precision.

Thank all

Bye Gaetan

GregS ( snipped-for-privacy@zekfrivolous.com) writes:

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GregS 18 years ago

Another cheap meter I guess. I actually bought one from Jameco over 15 years ago. It claimed very good accuracy. Mine has worked well, and mine has a analog front panel adjustment screw and there are no leads for the capacitor input. There is a front panel socket area for different sized caps. I never had any problem with this meter.

I just looked at it again since I have mostly been using the Fluke.

greg

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