klinemj
Emo VIPs 
Official Emofest Scribe
Posts: 15,086
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Post by klinemj on May 5, 2016 15:32:09 GMT -5
So uh what's DVM? I assume it's not related to EDM and there's no Skrillex involved. I would like to know because I am standing here in my boxers. I've got no shoes but I grounded myself by getting in the bathtub. I plant to cool my emo amps by turning on the shower. After safely cooling it down then I shall get to work. (But seriously, what's DVM?  ) Most commonly, it is a digital volt meter or a doctor of veterinary medicine. I will leave it you from here to sort it out as to which it is. Mark |
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Post by leonski on May 6, 2016 0:18:43 GMT -5
So uh what's DVM? I assume it's not related to EDM and there's no Skrillex involved. I would like to know because I am standing here in my boxers. I've got no shoes but I grounded myself by getting in the bathtub. I plant to cool my emo amps by turning on the shower. After safely cooling it down then I shall get to work. (But seriously, what's DVM? ) Digital Volt Meter. Maybe more commonly called the DMM, Digital MultiMeter. |
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Post by Jim on May 6, 2016 11:24:06 GMT -5
Or a VOM. VOLT OHM METER.
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Post by leonski on May 6, 2016 11:50:03 GMT -5
There are some differences between a VOM and what WAS a VTVM (Vacuum Tube Volt Meter) and between a DVM / DMM. A VOM was generally a constant input resistane PER VOLT of input. This meant it had some circuit loading effects at low voltages. They are not very useful for modern logic and Low Voltage stuff. My FIRST VTVM an Allied Knight Kit ! was IIRC, 11meg input resistance constant regardless of input voltage. It had 2 tubes, and a single circuit board along with some external switching. I REALLY wish I had kept it. The lowest voltage scales were both sensitive and practical / useful. It is worth it, IMO, to get the least expensive DVM style meter. Mine was maybe 25$ and includes an input for a Type-K thermocouple, which I find useful on the BBQ or checking the AC output on someones car. Harbor Freight sometimes sells 'em for even LESS. The 2vdc scale is good for batteries and the 20vdc scale for checking auto electrics. 200vac is for MOST home use except 220 circuits. I've seen the cheapest for <10$ shipped and they include a Diode and transistor check function. The 'worlds greatest' VOM is probably STILL the Simpson 260 series. www.simpson260.com/260-8/simpson_260-8.htmIt is 20,000 ohms per volt AC and 5000 ohms per volt DC. Or did I swap DC and AC? STILL, every shop should have one. |
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Post by Jim on May 6, 2016 16:37:42 GMT -5
Interesting. I always thought the terms were pretty much interchangeable. I wasn't familiar with a VTVM. I appreciate the background and history. Thanks for sharing that! I've purchased one of those 5-10 $ meters from Parts Express. Pretty much disposable - but good enough for continuity and odd jobs. Surprisingly low cost! I love my Fluke - but won't loan it to people. |
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Post by leonski on May 6, 2016 23:44:22 GMT -5
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