Instrument Requirements Recommended Model Use
1
Variable voltage trans-
former or AC source
Adjustable to highest rated input voltage
Power: 500 VA
Keysight 6813B or equivalent V
RC – for N678xA transient
test
Capacitor: 150 μFfixed film
Resistor 50 mΩ
EPCOS B32526R0157K
Vishay LVR01R0500FE70
V
1
V = Verification C = Calibration
2
Dependent on rating of model being tested
Measurement Setups
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. You can set up the
voltmeter to do this automatically by programming 100 power line cycles per measurement.
If you are using a Keysight 3458A DMM also 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 Shunt
The 4-terminal current shunt is used to make accurate current measurements. It has two monitoring
terminals as well as two load terminals. Connect the voltmeter directly to the monitoring terminals.
Also allow sufficient airflow for cooling.
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.
Note that an N6784A SMU power module should be used as the load when testing transient response
on models N678xA SMU and N6783A.
Program Control
You may chose to automate the calibration and verification procedures. If computer controlled test
setups are used, the relatively slow settling times and slew rates of the power system must be taken
into account. "Wait" statements can be used in the test program to allow for the appropriate settling
times for the power system.
Keysight N6700C Operating and Service Guide 331
6 Verification and Calibration
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