2 - Verification and Performance Tests
Transient Recovery Time
This test measures the time for the output voltage to recover to within the specified value following a 50% change in the load current.
tttt
Loading Transient
vt
t
v
Unloading
Transient
Figure 2-2. Transient Waveform
a.Turn off the supply and connect the output as in Figure
b.Turn on the supply and program the output voltage to the
c.Set the load to the Constant Current mode and program the load current to 1/2 the power supply
d.Set the electronic load's transient generator frequency to 100 Hz and its duty cycle to 50%.
e.Program the load's transient current level to the supply's
f.Adjust the oscilloscope for a waveform similar to that in Figure
g.The output voltage should return to within the specified voltage (v) in less than the specified time (t). Check both loading and unloading transients by triggering on the positive and negative slope.
Constant Current (CC) Tests
CC Setup
Follow the general setup instructions in the Measurement Techniques paragraph and the specific instructions given in the following paragraphs.
Current Programming and Readback Accuracy
This test verifies that the current programming and readback are within specification.
a.Turn off the supply and connect the current monitoring resistor across the power supply output and the DVM across the resistor. See "Current Monitoring Resistor" for connection information.
b.Turn on the supply and program the output voltage to 5 V and the current to zero.
c.Divide the voltage drop (DVM reading) across the current monitoring resistor by its resistance to convert to amps and record this value (Iout). Also, record the current reading on the front panel display. The readings should be within the limits specified in the performance test record card for the appropriate model under CC PROGRAMMING @ 0 AMPS.
d.Program the output current to
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