2 Verification and Adjustments
56 Keysight E36200 Series Service Guide
Measurement techniques
Voltmeter
To ensure that the values read by the voltmeter during both the verification
procedure and the calibration procedure are not affected by the instantaneous
measurement of the AC peaks of the output current ripple, make several DC
measurements and average them.
Current-monitoring resistor
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. If a variable resistor is used, switches should be
used to connect, disconnect, or short the load resistor. For most tests, an
electronic load can be used. The electronic load is considerably easier to use than
load resistors, but it may not be fast enough to test transient recovery time and
may be too noisy for the noise (PARD) tests.
Fixed load resistors may be used in place of a variable load, with minor changes to
the test procedures. Also, if computer controlled test setups are used, the
relatively slow (compared to computers and system voltmeters) settling times and
slew rates of the power system may have to be taken into account. “Wait”
statements can be used in the test program if the test system is faster than the
power system.
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