Specifications
Performance Verification
Voltage Programming and Readback Accuracy
This test verifies that the voltage programming and measurement functions are within specifications.
Step 1. Turn off the power supply and connect a DMM and an electronic load to the output (see Test Setup A). Also con-
nect the remote sense leads to the output.
Step 2. Turn on the power supply and program the instrument settings as described in the test record form under
“Voltage Programming & Readback, Min Voltage”. Turn the output on.
Step 3. Turn on the electronic load and set it to CC mode. Program it to the current setting described in the test record
under “Voltage Programming & Readback, Min Voltage”. The power supply's output status should be “CV”, and the out-
put current should be close to the electronic load's current setting.
Step 4. Record the output voltage reading from the DMM and the voltage measured over the interface. The readings
should be within the limits specified in the test record form for the appropriate model under “Voltage Programming &
Readback, Minimum Voltage”.
SHOCK HAZARD The next step applies the full output voltage of the power supply to
the output terminals.
Before proceeding to step 5, turn off the output of the power supply and turn off the
electronic load. If the electronic load is rated less than the voltage rating of the power
supply, you must also physically disconnect the load from the power supply. Use a
switch as shown in Test Setup A. Only open the switch when the output is turned off.
Step 5. Turn on the output and program the instrument settings as described in the test record form under “Voltage
Programming & Readback, High Voltage”.
Step 6. Record the output voltage reading from the DMM and the voltage measured over the interface. The readings
should be within the limits specified in the test record form for the appropriate model under “Voltage Programming &
Readback, High Voltage”.
Step 7. Turn off the output. Disconnect the remote sense leads from the output and repeat steps 1 through 6. This
verifies the voltage programming and readback accuracy with local sensing. In local sense mode the sense terminals
are internally connected to the output terminals.
Constant Voltage Load Effect
This test measures the change in output voltage resulting from a large change in output current.
Step 1. Keep the connections as in Voltage Programming and Readback Accuracy (see Test Setup A). Connect the
remote sense leads.
Step 2. Turn on the power supply and program the instrument settings as described in the test record form under “CV
Load Effect”.
Step 3. Set the electronic load to the first current value as described in the test record form under “CV Load Effect”.
The power supply's output status should be “CV”.
Step 4. Record the output voltage reading from the DMM.
Step 5. Set the electronic load to the second current value as described in the test record form under “CV Load Effect”.
Record the voltage reading from the DMM again. The difference between the DMM readings in steps 4 and 5 is the load
effect, which should not exceed the value listed in the test record form for the appropriate model under “CV Load
Effect”.
124 Agilent N8900 Series Operating and Service Guide