compared to an analog meter, which of these would not be considered an advantage DMM(digital multimeter)?

Question

1- readability in bright sunlight
2- less chance of reading error
3- better accuracy
4- less circuit loading

Answer 1

As an electronics technician I would choose a Digital Multimeter (DMM) over an Analogue Multimeter firstly because of the DMM's ability to deliver highly accurate readings in my job I have to adjust circuit voltages to within millivolts and sometimes microvolts, secondly because there is no chance of paralax error as most Analogue meters have a mirror behind the pointer to align it, but most don't have this advantage, it is sometimes difficult to align the pointer to a particular reading because of space constraints therefore making the meter harder to read say from a distance, so that this error can be induced into the reading whereas DMM's don't have this problem. All DMM's have a very large input impedance meaning the meter itself doesn't load down the circuit inducing an inaccurate reading whereas Analogue meter have varying input impedances and if you choose to use an Analogue meter with a low input impedance say less than half a Meg Ohm then you'll induce an unwanted load into the circuit and your readings will be very inaccurate.

In short, I would choose a DMM over an Analogue meter because of Choices 2, 3 and 4. Therefore the answer to your question is choiced 1, As choice 1 is not considered an advantage of a DMM but is one of its drawbacks.

That said a DMM is a very poor choice if you are measuring voltage drops across switches or measuring switch performance, for example switch speed with respect to signal strength. In Aircraft circuitry this function is vital to ensure relay action in the aircraft is positive with no "bounce". This is important in an aircraft situation because you don't want the pilot to be selecting systems by switches which are intermittent.

The best and really the only way to do this accurately is with an Analogue meter as you can actually see the action of the switch happening in real time and measure the resistance of the switch contacts at the same time, very very handy for this function.

Hope that I haven't confused you and that you find this information useful....good luck and a good question....

Answer 2

Absolutely, #1 is the only advantage analog meters have over DMMs.

Re #2, DMMs provide solid numbers rather than a scale that has to be interpreted. Re #3, analog meters are limited to at best, about 1% accuracy, due to the combination of the limits of analog metering circuitry and the limits of interpreting the scale. Re #4, analog meters actually load the circuit under test quite a bit, most that I recall by about 10kohms/V. DMMs, even cheap ones, have input impedances measured in the gigaohm range.

Definitely #1.

Answer 3

2- less chance of reading error

They both should be readable in the light
they both are equally accurate
They both require the same circuit loading

The digital meter will tell you the answer in numbers. The analog meter may require you to pick the right scale and read the numbers from the scale correctly.

Answer 4

The answer is readability in bright sunlight. To test this theory, take a calculator or something else with an LED screen outside and see how much more difficult is to read. This isn't that bad of a problem, so LEDs are the standard today (plus they're solid state).

Answer 5

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Answer 6

1. In bright light, the LCDs can either fade or be difficult to read. The other 3 functions the DMM has 'hands down'.

Answer 7

2- In certain Instrumentation measurements (eg.mv from certain transducers) involving varying frequencies, the DMM is unreliable...It's circuitry utilizes a fixed frequency reference....However, it can obviously measure frequency itself, if that is what the selector is set to...