8.
Take the difference between the current readings in steps 6 and 7 is the load regulation current
(I
load
– I
short
). The difference of the readings during the immediate change should be within the
specification limits.
CCline regulation
1.
Turn off the power supply using the AC line switch.
2.
Connect the power supply output with a DMM, an electronic load and a current shunt. See Recom-
mended test equipment for details.
3.
Connect the AC power cord of the power supply to the AC power source.
4.
Turn on the power supply using the AC line switch.
5.
Program the output voltage and output current as described in the test record form under CC line
regulation.
6.
Operate the electronic load in constant voltage mode and set its voltage to the power supply output
value as described the test record form under “CC Line Regulation”. See the Test Record Forms
under Test Description of “CC Line Regulation” for details. Check that the front panel CC annun-
ciator of the power supply remains lit. If it turns to CV or UNREG, adjust the load so that the output
current drops slightly until the CC annunciator lights up.
7.
Adjust the AC power source to low line voltage limit (90 VAC for nominal 100 VAC, 104 VAC for nom-
inal 115 VAC, 194 VAC for nominal 215 VAC, or 207 VAC for nominal 230 VAC). Record the output
current reading (I
lowline
) by dividing the voltage reading on the DMM by the resistance of the cur-
rent monitoring resistor.
8.
Adjust the AC power source to high line voltage (110 VAC for nominal 100 VAC, 127 VAC for nominal
115 VAC, 237 VAC for nominal 215 VAC or 253 VAC for nominal 230 VAC). Record the current read-
ing (I
highline
) again immediately by dividing the voltage reading on the DMM by the resistance of
the current monitoring resistor.
9.
Take the difference between the DMM readings in steps 7 and 8 is the CC line regulation (I
lowline
–
I
highline
). The difference of the readings during the immediate change should be within the spe-
cification limits.
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