Specifications

Verification and Calibration
line cycles per measurement. If you are using an Agilent 3458A DMM also turn on auto-calibration (ACAL) and the
autorange function (ARANGE).
Current 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 cool-
ing.
Electronic Load
Many of the test procedures require the use of a variable load capable of dissipating the required power. For most tests,
an electronic load can be used. The electronic load is considerably easier to use than load resistors. Note that for proper
operation, the electronic load requires a minimum of 3 V to be present at its input terminals. To avoid contact with any
high voltages during operation, use switches to connect and disconnect the electronic load.
When paralleling loads for higher currents during transient response testing, use the external trigger input on the loads
to synchronize the transition from low current to high current operation.
Note that you may use load resistors instead of an electronic load. To avoid contact with any high voltages during oper-
ation, use switches to connect, disconnect, or short the load resistors.
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 supply must be taken into account. "Wait" statements
can be used in the test program to allow for the appropriate settling times for the power supply.
120 Agilent N8900 Series Operating and Service Guide