Current Shunt
The 4-terminal current shunt is used to eliminate output current measurement error caused by voltage
drops in the load leads and connections. It has special current-monitoring terminals inside the load
connection terminals. Connect the voltmeter directly to these current-monitoring terminals.
Electronic Load
Many of the test procedures require the use of a variable load capable of dissipating the required
power. For all tests, a Keysight MP4300 mainframe, with MP4361A modules can be used as a load. The
electronic load unit is considerably easier to use than load resistors.
Fixed load resistors may be used in place of a variable load, with minor changes to the test procedures.
To avoid contact with any high voltages during operation, use switches to connect, disconnect, or
short the load resistors.
Also, if computer controlled test setups are used, the relatively slow (compared to computers and
system voltmeters) settling times and slew rates of the unit under test may have to be taken into
account. "Wait" statements can be used in the test program if the test system is faster than the unit
under test.
Keysight MP4300 Series Operating and Service Guide 169
6 Verification and Calibration
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