A 1179, A 1257, A 1395 Flex current clamps
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7 Measuring current with A1179/A1257/A1395
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Picture 7.1: Wrap the measured cable with the measuring clamp
To use the A1179/A1257/A1395 Flexible Current Clamps, follow these instructions:
1. Connect the D01 3 Pin connector of the A1179/A1257/A1395 Flexible Current
Clamps to the desired input on the measuring instrument (power meter, digital
multimeter, oscilloscope,…) .
2. On the A1179/A1257/A1395 Flexible Current Clamps unit, select the least sensitive
range (set the range to ‘2000/3000 A’ – 0.5/0.333 mV/A).
3. Select the corresponding sensitivity (.. mV/A) on your instrument. If you are using a
multimeter, select an appropriate AC voltage range.
4. Wrap the flexible measuring head around the conductor to be tested, close coupling
(See Picture 7.1 ).
5. It is very important that the conductor is as the center and perpendicular to the
measuring head. (if it is no possible additional error of 2% of full scale can occur).
6. Do not measure close to other current-carrying conductors if possible. (An external
field of 40 A/m can cause an additional measurement error of 1% of full scale).
7. Make sure that the arrow marked on the clamp coupling points toward the correct
orientation for correct phase display on the oscilloscope. (See Picture 7.1 )
8. Keep the clamp coupling more than 2.5 cm (1 inch) away from the conductor to be
tested and other nearby conductors.
9.
Observe the current value and waveform on the instrument’s display. If desired,
select the lower range on the A1179/A1257/A1395 module and set the
corresponding sensitivity on the measurement instrument. If the A1179/A1257/A1395
is used with a multimeter, the actual current value can be calculated from the
displayed AC voltage value.
