Measurements; Making A Measurement; Converting To Current - AEMC MR417 User Manual

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2.6 Measurements

2.6.1 Making a Measurement

After adjusting DC Zero:
1. Press the clamp trigger to open the jaws.
2. Clamp the jaws around the conductor to be measured. Use the centering
marks on the jaws to position the clamp around the conductor. If the
measurement is to be used in a power calculation, ensure the arrow on
the clamp jaws (see Figures 1 and 2) points in the direction of the current
flow: source load.
3. Release the trigger, ensuring the jaws are completely and correctly
closed.
4. Observe the measurement displayed on the measuring instrument.
5. If the OL indicator lights, the current is too high to be measured. If the
sliding switch is set to the 10mV/A range, change the setting to 1mV/A.
Figure 4 (MR527 shown)

2.6.2 Converting to Current

The MR417 and MR527 both provide two measurement ranges. The MR417
measures current up to 600A with 1mV of output corresponding to 1A, and current
up to 60A with 10mV corresponding to 1A. The MR527 measures current up to
1400A with 1mV corresponding to 1A, and current up to 150A with 10mV
corresponding to 1A.
To convert the clamp output to current, divide the voltage reading on the connected
measuring by the V/A coefficient. For example, in the MR527's 1400A range a
reading of 100mV corresponds to a current of 100A.
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