Adjustment Procedures
AC 40 A range
1.
Lock the RANGE button of the U1583B current clamp to 40 A.
2.
Connect the current clamp to a multimeter as shown in Figure 1.
3.
Set the multimeter to measure ACV with range > 400 mV full scale.
4.
Open the jaws of the current clamp and align to the 50 turns coil.
5.
Connect calibrator AUX terminals to 50 turns coil. Configure calibrator to generate a
current of 0.4 A with a 55 Hz frequency (equivalent to 20 A, 55 Hz with 50 turns coil) for the
adjustment of the current clamp.
6.
Remove two Phillips screws on the back of the current clamp and proceed to adjust VR1 using
a cermanic trimmer until the display on the multimeter indicates AC 200 mV ± 0.2 mV. Refer to
Figure 4 for the position of VR1.
Figure 4: U1583B Current Clamp Circuit Board Diagram
AC 400 A range
1.
Release the Range button of the U1583B current clamp to 400 A.
2.
Connect the output BNC of the U1583B to a BNC-to-dual banana converter plug and proceed to
connect it to the output of the V (HI) and COM (LO) terminals of the multimeter.
3.
Set the multimeter to AC 500.0 mV or 1000.0 mV.
4.
Open the jaws of the current clamp and align to the 50 turns coil.
5.
Connect calibrator 20 A and AUX LO terminal to 50 turns coil. Configure calibrator to generate a
current of 4 A with a 55 Hz frequency (equivalent to 200 A, 55 Hz with 50 turns coil) for the
adjustment of the current clamp.
6.
Remove two Phillips screws on the back of the current clamp and proceed to adjust VR2 until the
display on the multimeter indicates AC 200 mV ± 0.2 mV. Refer to Figure 4 for the position of VR2.
Remember to replace the screws to their original position after performing the calibration
adjustments.
Maintenance
Repair or service should only be performed by a qualified personnel.
To avoid electrical shock or damage to the current clamp, do not allow moisture to get
inside the case and remove all connections before opening the case.
Cleaning
-
Periodically wipe the case with a damp cloth and mild detergent. Do not use cleaners or solvents.
-
Open the jaws and wipe the metal areas of the jaws with a lightly oiled cloth, and then wipe the oil
with a dry cloth. Do not allow rust or corrosion to form on the metal surface of the jaws.
Troubleshooting
If the current clamp does not perform properly, follow the steps below to identify the problem:
1.
Inspect the mating surface of the jaws for cleanliness. The presence of foreign material may
prevent the jaws from closing properly and affects the measurement results.
2.
Verify and ensure the current clamp range is appropriate.
3.
Verify and ensure the function and range selection on the multimeter or oscilloscope are
appropriate.
VR1 for AC 40 A
adjustment
VR2 for AC 400 A
adjustment
© Keysight Technologies 2009-2020
Edition 7, September 2020
Printed in Malaysia
U1583-90107
www.keysight.com
