If your digital multimeter offers a frequency setting (Hz is the symbol) on the dial:
If your digital multimeter offers a frequency (Hz) button:
Circuits and equipment may be designed to operate at a fixed or variable frequency. They may perform abnormally if operated at a different frequency than specified.
Example: An ac motor designed to operate at 60 Hz operates slower if the frequency is less than 60 Hz, or faster if frequency exceeds 60 Hz. For ac motors, any change in frequency causes a proportional change in motor speed. A five percent reduction in frequency yields a five percent reduction in motor speed.
Some digital multimeters include optional modes related to frequency measurement:
In some circuits, there may be enough distortion on the line to prevent an accurate frequency measurement. Example: ac variable frequency drives (VFDs) can produce frequency distortions.
When testing VFDs, use the low-pass filter setting in the advanced multimeters for accurate readings. For multimeters without the low pass filter setting, turn the dial to dc voltage, then press the Hz button again to measure the frequency on the dc voltage setting. If the meter allows for a decoupled frequency measurement, you might also try changing the voltage range to compensate for the noise.
Source : Fluke
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my multimeter doesn't have HZ are there any other methods of measureing