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• The current conductor must be centered within the jaw aperture and no influence from
Current Clamp with
adjacent currents.
BNC connector
• Connect to load impedance > 1 MW ||100 pF.
• Crest factor < 3.
Current Clamp with
BNC connector
Figure 1: Connection Diagram
Alignment Marks
Put one conductor only within the jaws on the inside section of the
indicated marks as much as possible in order to meet the accuracy of
the specifications. Make sure the clamp is vertical to the conductor.
Current Range Selection
T
o push and release the yellow button for 40 A range and lock the button for 400 A range.
Button
Release
Lock
Operation
AC current can be measured without removing the conductor out of the circuit by following the procedure
shown below:
1.
Plug the BNC cable to the BNC with dual banana plugs, and then plug into the V/COM terminals on a
multimeter. For a handheld oscilloscope, plug the BNC connector directly to the oscilloscope.
2.
Set the ACV measurement and range on the multimeter.
3.
Position the jaw to a single conductor and center it accordingly to the alignment marks.
4.
Ensure that the arrow marked on the clamp jaw points towards the load for phase measurements or
away from the load (toward the source) for neutral measurements.
5.
Observe the AC value on the multimeter or the waveform on the handheld oscilloscope which is
proportional to the current.
6.
Select a lower range on the current clamp and set the corresponding sensitivity (mV/A setting)
on the oscilloscope if required.
Calibration Equipment
The pre-calibration guidelines are shown as follows:
•
Be sure you are a qualified person to perform the calibration.
•
The environment should be 23 °C ±2 °C, and the relative humidity (RH) shall be < 80%.
The test equipment requirements listed in table below or equivalents are required to perform the calibration
and performance verification test procedures. Alternative equipment may be used as long as the accuracy is as
good as or better than the specifications listed.
Standard Source
AC Current Calibrator
Multimeter
50 Turns Current Coil
Operating Range
33 mA to 329.99 mA at 10 Hz to 3 kHz
0.33 A to 2.99999 A at 10 Hz to 3 kHz
3 A to 20.5 A at 10 Hz to 3 kHz
AC 500.0 mV or 1000.0 mV
0.2 A to 20.5 A
BNC-to-banana plug
Handheld
Oscilloscope
Range
~ 40 A
~ 400 A
Accuracy
Required
≤ ± 0.2 %
≤ ± 0.6 %
≤ ± 3.0 %
≤ ± 1.5 %
≤ ± 1.0 %
Handheld Digital
Multimeter (DMM)
Output
~ 10 mV/A
~ 1 mV/A
Recommended
Equipment
Wavetek 9100 or Fluke 5520A or
5101B or equivalent
Keysight U1251A/B or U1252A/B or
Keysight-34405A or equivalent
Fluke 5500A Coil or Wavetek 9100
Option 200 or equivalent
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