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the supply senses this through the connection to its A2
terminal and reduces the output current to zero. (If this
automatic shutoff feature is not required, the 10k ohm
resistor may be omitted.) As shown in Figure 3-17, Rx
must be selected so that its I R drop is less than the
maximum rated output voltage of the supply, but greater
than the initial battery voltage.
3-94
To give a battery a constant-current discharge,
proceed as follows:
a. Turn off the power supply and disconnect the
jumpers from terminal A1 to A2 and from A2 to A3.
(This step disables the supply's VOLTAGE controls.)
b. Connect terminal A3 to +S and leaves all other
jumpers connected as for normal operation as shown in
Figure 3-1 7.
c. Connect the positive terminal of the battery to A2
through a 10kS7 resistor.
d. Connect the positive terminal of the supply to the
negative terminal of the battery.
e. Connect Rx between the negative terminal of the
supply and the positive terminal of the battery, rotate
the supply's current control fully counterclockwise (CCW),
energize the supply, and set the current control for the
desired discharge current as indicated on the front panel
meter.
EXT.
CROWBAR
TRIGGER
+
^ Al AS A3 A4 A5 A6 A7 A8 +S -S A9
Eg = INITIAL BATTERY VOLTAGE
I D * CONSTANT DISCHARGE CURRENT
Eg = MAX
RATED VOLTAGE OF SUPPLY
Rv (MINIMUM )« —
id
Eg (MINIMUM) = RXID
Figure 3-17. Battery Discharging
3-14
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