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Old 11th June 2009, 09:30 AM   #1
Stuey is offline Stuey  Australia
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Default Use for DMM square wave output

Hi all,

I've just bought a cheap tiny DMM to throw in my car tool box, and it has a 50 Hz square wave output.

What are the uses for this?

Thanks

Stuey
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Old 11th June 2009, 09:59 AM   #2
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How odd.
I've seen DMM's with frequency readouts but never one with a squarewave oscillator.
Who made it? Model number?
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Old 11th June 2009, 12:45 PM   #3
Stuey is offline Stuey  Australia
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It's a real cheapy - a UNI-T UT20B.

I bought it simply because of its tiny size and price - it's about 3" x1.5" and weighs 100g with battery and was a mere $9 - including the battery!

I have another couple of better meters but they are a bit unweildy to keep in a gereral purpose tool box.

I actually found on the web some high end meters such as Agilent's with this feature, but no explanation of what it's for. I also found some suggestions that it's for logic testing, but that's well out of my sphere of knowledge. Yet another site speculated about it being to test audio amplifiers.

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Stuey
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Old 12th June 2009, 12:42 AM   #4
Eva is offline Eva  Spain
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Basic transformer testing, basic inductor and capacitor testing, logic testing...
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Old 12th June 2009, 02:48 AM   #5
star882 is offline star882  United States
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In my ENGR 111 class, the meters supplied had a very simple signal generator. (Of course, I brought my own meter since I knew they aren't going to have any good stuff in that class.) It was fixed at about 55Hz and I don't think it would be very stable.

About the only real application I can think of is simple go/no go audio equipment testing. Even a simple 555-based signal generator is much more useful for real testing.
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