Constant Current Load Effect
This test measures the change in current resulting from a change in voltage from a short to full scale.
Step 1. Turn off the unit under test. Connect the current shunt directly across the output terminals.
Connect the DMM directly across the current shunt (see
). Note that the RP79xxA load is
not used in this portion of the test.
Step 2. Turn on the unit under test and program the instrument settings as described in the test record
under “CC Load Effect”. The output status should be “CC”, with the output voltage be close to zero.
Wait 5 minutes for the temperature to settle.
Step 3. Divide the voltage drop (DMM reading) across the current shunt by the shunt resistance to
convert to amps and record this value.
Step 4. Turn off the unit under test and connect the RP79xxA load unit between the current shunt and
the output terminals (see
).
Step 5. Set the RP79xxA load for voltage priority mode and program its voltage and current limit as
described in the test record under “CC Load Effect”. Enable the load's output.
Step 6. Program the unit under test to the settings as described in the test record under “CC Load
Effect”. Enable the output of the unit under test. The output status should be “CC”. If it isn’t, adjust the
load so that the output voltage drops slightly.
Step 7.Divide the voltage drop (DMM reading) across the current shunt by the shunt resistance to
convert to amps and record this value. The difference in this current reading and the reading in step 3
is the load effect, which should not exceed the value listed in the test record for the appropriate model
under “CC Load Effect”.
Current Sink Capability Verification
This test checks the ability of the power supply to sink up to 10% of its rated output current.
Step 1. Turn off the unit under test and connect the RP79xxA unit as an external source to the + and -
output terminals (see
). Make sure that the voltage rating of the RP79xxA external source
is at least half of the voltage rating of the unit under test.
Step 2. Set the RP79xxA external source for voltage priority mode and program it to the voltage as
described in the test record under “10% of current rating (Isink)”.
Step 3. Turn on the unit under test. Set the operating mode to voltage priority. Program the instrument
settings as described in the test record under “10% of current rating (Isink)”.
Step 4. Check the front panel display of the unit under test and verify that it is sinking approximately
10% of its rated current, and has a -CL status. Divide the voltage drop (DMM reading) across the
current shunt by the shunt resistance to convert to amps and record this value. The readings should
be within the limits specified in the test record form under “Current Sink Tests”.
6 Verification and Calibration
234
Keysight N69100 Series Operating and Service Guide
Содержание N69100 Series
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