Operation - HP 712B Operating And Servicing Manual

5 MA
Output terminal for the variable (0-150
volt) regulated bias voltage supply.
GND
Terminal for making connection to the
chassis. Anyone of the output terminals
may be connected to the chassis by con-
nection to terminal GND.
COM +HV GND
These binding posts are terminals for the
high voltage supply, common conductor,
and chassis ground.
+HV
Output terminal for the regulated 0-500
volt voltage supply.
COM
Output terminal common to the HV, 5 MA
(variable bias), and -300V 50 MA (fixed
bias) cir cuits •
GND
Terminal for making connection to the
chassis.
-BIAS CONTROL
This control varies the output of the regu-
lated bias voltage supply from 0 to 150 volts.
HV CONTROL
This control varies the output of the regu-
lated high voltage supply from 0 to 500 volts.
METER RANGE
This switch connects the regulated high
voltage supply circuit to the voltmeter on
either the 0-150V or 0-500V range. Opera-
tion of the switch to 0-150 -BIAS connects
the variable bias supply circuit to the volt-
meter.
2-2 OPERATION
CAUTION
Avoid electric shock by turning the
high voltage switch to the off posi-
tion before making any connections
to the instrument.
2-2
The procedure for operating the Model 712B
Power Supply is as follows:
a. Connect the power cable to aIlS V power
line and turn the AC POWER switch to
ON.
NOTE
The triple -conductor power cable is
supplied with the new NEMA approv-
ed three-prong plug. The third con-
ductor provides a chassis ground.
An adapter may be obtained to per-
mit use of this plug with two-conduc-
tor receptacles.
b. With the HIGH VOLTAGE switch in the
off position, connect the output terminals
to the load.
c.
If the bias supply is to be us ed, set the
METER RANGE switch to the 0-150V
-BIAS position and adjust the -BIAS CONTROL
for the desired voltage.
NOTE
The internal impedance of the vari-
able bias circuit can be as high as
10, 000 ohms, depending on the set-
ting of -BIAS CONTROL.
d. Set the METER RANGE switch at the 0-
150V or 500V position, and adjust the
HV C ONTR OL for the des ired output voltage.
e. Turn the HIGH VOLTAGE switch to ON,
check the bias voltage, and readjust -BIAS
CONTROL if necessary.
f. If the Model 712B is to be used for an
application which requires a power sup-
ply of more than 500 volts, up to 300 volts
additional may be made available by connect-
ing the load across +HV and -300V 50 MA.
Ground may be connected to either terminal,
as desired.