Understanding VOM Multimeter & Full-Scale

In summary, the standard VOM multimeter uses a meter movement that measures current up to 50 microamperes. It can also measure other ranges of amps and volts through the use of series and shunt resistors. The full-scale refers to the maximum amplitude of the signal that can be measured.
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phrygian
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Homework Statement



In my textbook, it says "the standard VOM " (volt-ohm-milliameter) multimeter uses a meter movement that measures current (typically 50 microamperes full-scale).

I am just having trouble understanding what this means, I looked up full-scale and found that it was the number of the largest amplitude of the signal, so if the VOM can only measure up to 50 microamperes shouldn't it be a microameter? I feel like I may be misinterpreting full-scale?

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The Attempt at a Solution

 
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Yes, it is, basically, just a microampere meter.
It measures other ranges of amps, together with volts, through the use of suitable series and shunt resitors respectively.
 

FAQ: Understanding VOM Multimeter & Full-Scale

What is a VOM multimeter and how does it work?

A VOM (volt-ohm-milliammeter) multimeter is an electrical testing device that measures voltage, resistance, and current. It works by using probes to make contact with the circuit being tested and then reading the results on a digital or analog display.

What is a full-scale reading on a VOM multimeter?

A full-scale reading on a VOM multimeter is the maximum value that the device can measure for a specific unit of measurement. For example, the full-scale reading for voltage may be 20 volts, meaning that the multimeter can accurately measure up to 20 volts. Beyond that, the readings may not be accurate.

How do I select the appropriate range on a VOM multimeter?

To select the appropriate range on a VOM multimeter, start by estimating the expected reading. Then, choose the range that is equal to or closest to the estimated reading. If the reading is too high for the selected range, adjust to a higher range. If it is too low, adjust to a lower range.

Can a VOM multimeter be used to test both AC and DC circuits?

Yes, most VOM multimeters have the capability to test both AC (alternating current) and DC (direct current) circuits. However, it is important to ensure that the multimeter is set to the correct mode before testing, as using the wrong mode can result in inaccurate readings or damage to the device.

What are some safety precautions to take when using a VOM multimeter?

When using a VOM multimeter, it is important to take the following safety precautions:

  • Always read the instruction manual before use.
  • Wear appropriate personal protective equipment, such as gloves and safety glasses.
  • Ensure the device is set to the correct mode and range before testing.
  • Do not touch the probes or any live circuits with your bare hands.
  • Do not use the multimeter in wet or damp conditions.
  • Turn off the power to the circuit being tested before making any adjustments or changes.

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