HP SCR-1P Series Operating And Service Manual page 39

5-16. LOAD REGULATION
5-17 . CONSTANT VOLTAGE. Proceed as follows:
a. Connect the 48 -ohm load resistor across the output terminals and the
differential voltmeter across the -S and +S tenninals.
b. Tum front-panel CURRENT controls fully clockwise (maximum).
c. Tum the front-panel VOLTAGE controls until rront-panel ammeter indi-
cates2. 5 amperes.
d . Record voltage indicated on differential voltmeter.
e. Disconnect load resistor.
f. Differential voltmeter indication
should change by less than- 120 mvdc.
5 - 18. CONSTANT CURRENT. Proceed as follows:
a. Connect test setup shown in figure 5-3.
b. Turn front-panel VOLTAGE controls fully clockwise (maximum) .
c. Turn front-panel CURRENT controls until front-panel ammeter indicates
2. 5 amperes.
d . Record voltage indicated on differential voltmeter.
e. Close the shorting switch.
f. Differential voltmeter indication should change by less than 25 mvdc.
5-19 . RIPPLE AND NOISE
5-20 . Proceed as follows:
a . Connect the 48 -ohm load resistor across the output terminals and the
ac voltmeter across the -S and +S terminals.
b. Tum front-panel CURRENT controls fully clockwise (maximum) .
c. Connect the variable voltage transformer between the input power source
and the power supply power input. Adjust the variable voltage transformer to 125
vac.
d . Tum front-panel VOLTAGE controls until front-panel ammeter indicates
~. 5amperes.
e. The ac voltmeter should indicate less than 240 mvrms .
5-4