Specifications

Performance Verification 2
Series N6700 Service Guide 11
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.
If you are using an Agilent 3458A DMM, you can set up the voltmeter
to do this automatically. From the instrument’s front panel, program
100 power line cycles per measurement. Press NPLC 100 ENTER.
If you are using an Agilent 3458A DMM, turn on auto-calibration
(ACAL) and the autorange function (ARANGE). For best results,
auto-calibration should be performed every 24 hours when verifying
or calibrating models N678xA SMU.
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.
Unless stated otherwise, an N6784A power module should be used as
the load when testing models N678xA SMU, and transient response
for models N6783A.