AC/DC Current Probes MR417 & MR527
13
3.6 MEASUREMENTS
3.6.1 Making a Measurement
After adjusting the
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
for a power calculation, ensure the arrow on the clamp jaws (see Figures 1 and
2) points in the right direction of the current flow:
source load
3. Release the trigger, ensuring the jaws are completely and correctly closed.
4. Observe the measurements displayed on the measuring instrument.
5. If the
OL
indicator lights up, the current is too high to be measured. If the sliding
switch is set to the
10 mV/A
range, change the setting to
1 mV/A
.
Figure 4 (MR527 shown)
3.6.2 Converting to Current
The MR417 and MR527 both provide two measurement ranges. The MR417
measures current up to 600 A with 1 mV of output corresponding to 1 A and
measures current up to 60 A with 10 mV corresponding to 1 A. The MR527 measures
current up to 1400 A with 1 mV corresponding to 1 A and measures current up to 150 A
with 10 mV corresponding to 1 A.
To convert the clamp output to current, divide the voltage reading on the connected
measuring device by the V/A coefficient. For example, in the MR527’s 1400 A range,
a reading of 100 mV corresponds to a current of 100 A.
