3-1TURN-ON CHECKOUT PROCEDURE
3-2 The following checkout procedure describes the use of the front panal controls and indicators (Figure 3-1) and ensures that the supply is opera- tional.
a. Set LINE circuit breaker ① to ON, and observe that pilot light ② lights.
b. Adjust VOLTAGE controls ③ until desired voltage is indicated on voltmeter ④ .
c. To ensure that overvoltage crowbar circuit is operational, rotate OVERVOLTAGE ADJUST control ⑤ (screwdriver adjust) counterclockwise until unit crowbars. Overvoltage lamp ⑥ will light and output voltage will fall to zero volts.
d. To deactivate crowbar, return OVERVOLT- AGE ADJUST control to its maximum clockwise position and turn off supply. Turn supply back on and voltage should again be value obtained in step
(b).
e. To check out constant current circuit, turn off supply. Short circuit rear output terminals and turn on supply.
f. Adjust CURRENT controls ⑦ until desired output current is indicated on ammeter ⑧ .
g. Remove short circuit and read following paragraphs before connecting actual load to supply.
3-3OPERATING MODES
3-4The power supply is designed so that its mode of operation can be selected by making strapping connections between particular terminals on the terminal strip at the rear of the power supply. The terminal designations are stenciled in white on the power supply below their respective terminals. The following paragraphs describe the procedures for utilizing the various operational capabilities of the power supply. A more theoretical description concerning the operational features of this supply is contained in Application Note 90, Power Supply Handbook (available at no charge from your local Hewlett-Packard sales office). Sales office addresses appear at the rear of the manual.
3-5NORMAL OPERATING MODE
3-6 The power supply is normally shipped with its rear terminal strapping connections arranged for constant voltage/constant current, local sensing, local programming, single unit mode of operation. This strapping pattern is illustrated In Figure 3-2.The operator selects either a constant voltage or a constant current output using the front panel controls (local programming; no strapping changes are necessary).
