f. Set the oscilloscope to 50 mv/div, ac coupled, 10
us/div, internal trigger, normal, and – slope.
g. Turn on the load switch to perform the transient
response test. Alternatively, remove R1 and
modulate an electronic load between 100 mA and
0.5 Amp(25W) or 1 Amp(50W). Note that if an
electronic load is used, the load’s current rise time
must be less than 25 µsec. to perform an adequate
test. If a load with longer rise time is used, the
transient response recovery time may appear to be
out of specification.
h. Adjust the oscilloscope trigger level for a stationary
waveform as shown in Figure 3-5 and check that
the loading transient is within 75 mV of its final
value in less than 75 µs.
i. Change the oscilloscope settings to + slope and
repeat steps g and h for the unloading transient (see
Figure 3-5).
j. Repeat steps a through I for each output in your
supply.
3-17 Turn On/Off Overshoot. This test measure the
amplitude of any transients in the output during turn on or
turn off of the supply.
a. Turn off the supply and connect an oscilloscope
across the + V and – V terminals of the output to be
tested.
b. Set the oscilloscope to 50 mV/div, dc coupled, 1
sec/div, and + slope.
c. Turn on the supply while observing the
oscilloscope. The maximum transient amplitude
should not exceed ± 100 mV. Repeat test by
observing the scope after turning off the supply.
d. Repeat the test (steps a through c) for each output
in your supply.
3-18 Programmable OV Accuracy Test. This test checks
the overvoltage (OV) programming accuracy. Taking the OV
programming accuracy and the voltage programming
accuracy into account.
a. Turn off the supply and disconnect all loads and
test equipment.
b. Turn on the supply and select the output to be
tested (OUTPUT SELECT key on the front panel).
c. Program the OV to 49 V. Send the following string:
OVSET <ch>, <49>
d. Program the output voltage to 48.44 volts by
sending the following string:
VSET <ch>, <48.44>
e. Note that the overvoltage should not trip and the
front panel should display the programmed output
voltage and no current.
f. Program the output voltage to 49.55 by sending the
following string:
VSET <ch>, <49.55>
g. Note that the overvoltage has tripped as indicated
by the display showing “OVERVOLTAGE”.
h. Reset the output by setting the OV to 55V and
resetting the OV circuit as shown below:
OVSET <ch>, <55>
OVRST <ch>
i. Check that the front panel again displays the
programmed output voltage and no current.
j. Repeat steps b through I for each output in your
supply.
3-19 Constant Current (CC) Tests
3-20 CC Setup. Follow the general setup instructions of
paragraphs 3-5 through 3-9 and the specific instructions
given in the following paragraphs.
3-21 Current Programming and Readback Accuracy. This
test verifies that the current programming, GPIB readback,
and front panel display functions are within specifications.
An GPIB controller must be used for the READBACK
accuracy part of this test. The accuracy of the current
monitoring resistor must be 0.005% or better.
a. Turn off the supply and connect a 0.1 ohm current
monitoring resistor across the output and a DVM
across the resistor (see paragraph 3-8).
b. Turn on the supply and select the output to be
tested (OUTPUT SELECT key on the front panel).
c. Select the low current range and program the
output voltage to 5 V and the current to zero by
sending the following strings:
IRSET <ch>, <.015(25W) or .2(50W)>
VSET <ch>, 5
ISET <ch>, 0
3-7
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