Mystery part on schematic

Bear in mind Radio Shack doesn't make ANYTHING. They are a reseller. A lot of their gear, is branded Micronta or Realistic.

Secondly, Realistic and Micronta are Japanese suppliers. I wouldn't expect them to 100% follow US standards for schematics.

Wild guess: spark gaps for protection.

Despite posting the forum link where they are identified as Surge Arresters, Tube Guy posted the "what are they?" question over here.

No one on that forum CLEARLY said what they are. Just guesses..... Guesses are not real answers.....

Some sort of transorb, TVS diode perhaps. GH

Well, here's something 100% accurate: that meter is a piece of s*it and of no real value to anyone who requires a good meter and knows how to use one. Total waste of time.

I have a whole pile of cheap meters as well as good ones. They're useful IME.

NT

Like I said..

clearly not.

El jueves, 23 de mayo de 2019, 1:13:10 (UTC-4), snipped-for-privacy@myshop.com escribi

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The first message of the forum link posted by you, clearly stated that the "mistery part" was labeled 39ZR07, and looked like a "disk green cap".

A quick search with Google threw this:

So it's just a MOV.

t and of no real value to anyone who requires a good meter and knows how to use one. Total waste of time.

ful IME.

FWIW I bought them to dot them around in various places where formerly I'd have had to go fetch a nice meter or forego using one at all. They can go w here loss or damage are a risk with little concern. They've saved time & en abled quick easy repairs. I don't normally need accuracy or a CAT 3 rating to get something working. They paid back their cost (2.44 each) in a few da ys IIRC, an ROI that's hard to beat. Any engineer should be able to undersa nd the utility of that.

Yes I require accuracy at times, and have the datrons to do that. These tid dlers are not for those occasions.

NT

paid back their cost (2.44 each) in a few days IIRC, an ROI that's hard to beat. Any engineer should be able to undersand the utility of that.

I have 4 or 5 of the 'Free' Harbor Freight metes. Verified them against a Fluke meter that was verified against some very high accurate lab gear. The HF meters are not that far off and work fine especially for a go/no go test. Does it really matter if the house voltage is 120 or 123 volts ? I have on in my truck and some in places around the house as I don't want to go the shop on the basement for a better meter.

My HF meters are all pretty accurate, as long as the battery is fresh. My yellow ones do not have any low-battery indicator, so the only hint is when the readings do not make any sense (which may be a challenge for an inexperienced user).