Electronics > Beginners

Why do I need more than 1 multimeter?

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vinlove:
When measuring a component, if reading is out of expected value, then I wonder, if it s it the component or MM.  Then I want to try with as many MMs as possible to confirm which is at fault. More MMs, merrier the confirmation.

Cliff Matthews:
Some situations could require 5 DMM's and perhaps a webcam to record simultaneous event data. More never hurts (unless your significant other knows how to drop-kick..)

Berni:
While i do probably have too many multimeters i do agree that the actual useful benefit of having more does tend to fall off after the 3rd one.

Having 3 of them lets you notice if 1 of them is going out of calibration because you will see 2 meters agreeing and one disagreeing.

Also 3 meters is the minimum for reasonably measuring the efficiency of a power supply. You need 2 meters to be current meters on the input and output. Those can't be be easily disconnected and moved around because moving the probes away breaks the circuit, while shorting the circuit back together affects measurement because the meter was causing a voltage drop different to the short. But the voltage can be a single meter since you can just poke the input and then poke the output with the probes without affecting anything.

But there still are reasons to go to >3 multimeters. Like measuring power supply efficiency without having to move a multimeter around, or having multimeters with extra special features for a given task. Like able to measure very small voltages or currents, having lots of digits (like 6.5 or more), having high impedance inputs, having a really nice continuity beeper in it, being small and rugged for field use... etc. You can't get all of these features in one meter

SparkyFX:

--- Quote from: Johnny10 on July 23, 2019, 12:07:16 pm ---Only one meter ???????

Are you sure you belong on this site ?     :)

--- End quote ---
I thought two are minimum for signup on the forum....

windsmurf:
I agree multiple meters are useful to measure voltage and current simultaneously. 

So why can't they build a meter that can do both at the same time?   

And why would anyone need more than 1 scope?  >:D

 

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