Operation - METREL MD 9231 Handbuch

MD 9231 Industrial TRMS AC/DC Current Clamp Meter

Operation

4 OPERATION
WARNING: Before and after hazardous voltage measurements, test the voltage function
on a known source such as line voltage to determine proper meter functioning.
ACV, DCV, DC+ACV, EF (NCV), & Line-level Hz functions
Inputs, other than that of EF as described below, are made through the test lead terminals
COM/+. Press SELECT button momentarily to select the subject functions in sequence.
Last selection will be saved as power up default for repeat measurement convenience.
Press Hz button momentarily to toggle the Line-level Hz function.
Note
ACV (and hence AC+DCV & Line-level Hz) function is equipped with digital low-pass
filter, and is capable of dealing with VFD (Variable Frequency Drives) signals. It also
improves ACV reading stability in noisy electrical environments.
Electric Field EF-Detection
The meter displays "EF" when it is ready. Signal strength is indicated as a series of bar-
graph segments on the display together with variable beep tones.
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