Analog Meter - Page 2 - Electronic Circuits Projects Diagrams Free

mdanh2002 · 19th May 2007, 04:22 PM

Quote:

Originally Posted by RODALCO

Best of all, they don't require batteries for current or voltage measurement

Theoretically this is right, when measuring current or voltage the analog multimeter can use the power from the input to make the needle move. But my analog multimeter needs 1 big 9V battery (which runs out very fast) and it doesn't work at all when I remove the battery (even when switched to voltage/current mode)

And maybe using the power from the input for the measurement circuit in voltage/current mode affects the accuracy?

**Nigel Goodwin** · 19th May 2007, 04:29 PM

Quote:

Originally Posted by mdanh2002

Theoretically this is right, when measuring current or voltage the analog multimeter can use the power from the input to make the needle move. But my analog multimeter needs 1 big 9V battery (which runs out very fast) and it doesn't work at all when I remove the battery (even when switched to voltage/current mode)

That's because it's an active meter, not a normal passive analogue one.

Quote:

And maybe using the power from the input for the measurement circuit in voltage/current mode affects the accuracy?

Yes it does, but so does a DMM as well - in fact, on high voltage ranges a DMM has a greater effect than a standard analogue meter.

Sceadwian · 20th May 2007, 04:58 AM

The battery is to power the opamps that buffer the input voltages. Otherwise the voltages produced themselves drive the analog meters. This in modern high impedance circuits would require very low impedance sources to achieve linearity and accuracy.

Dawny · 3rd October 2007, 03:25 PM

Call me silly but I like analogue meter's because they look better in sound based circuits.

Leftyretro · 3rd October 2007, 03:44 PM

Well I 'grew up' using analog meters, still have a Simpson stored away somewhere

. Great dependable and deserves it's rep.....

However once I got the chance to use a Fluke DMM at work decades ago I find I haven't used a analog meter in a very long time. At home now I use a Fluke model 87 true rms DMM when I need portablity and a love of my life (I'm such a nerd!) is a bench model Fluke 45 DMM. The 45 is so much fun to use, when I get bored I search old old batteries to measure and decide to keep or dispose

Lefty

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20th May 2007, 04:58 AM	(permalink)
Sceadwian	The battery is to power the opamps that buffer the input voltages. Otherwise the voltages produced themselves drive the analog meters. This in modern high impedance circuits would require very low impedance sources to achieve linearity and accuracy. __________________ "Because I be what I be. I would tell you what you want to know if I could, mum, but I be a cat, and no cat anywhere ever gave anyone a straight answer, har har." Last edited by Sceadwian; 20th May 2007 at 05:01 AM.

3rd October 2007, 03:25 PM	(permalink)
Dawny	Call me silly but I like analogue meter's because they look better in sound based circuits.

3rd October 2007, 03:44 PM	(permalink)
Leftyretro	Well I 'grew up' using analog meters, still have a Simpson stored away somewhere . Great dependable and deserves it's rep..... However once I got the chance to use a Fluke DMM at work decades ago I find I haven't used a analog meter in a very long time. At home now I use a Fluke model 87 true rms DMM when I need portablity and a love of my life (I'm such a nerd!) is a bench model Fluke 45 DMM. The 45 is so much fun to use, when I get bored I search old old batteries to measure and decide to keep or dispose Lefty __________________ Measurement changes behavior