(5) Change the dc voltmeter VOLTS
put binding posts of the power sup-
ply. (VOLTS RANGE of the dc volt-
RANGE switch to the 0.5-volt range.
meter switch in the 50-volt position)
until the dc voltmeter reads between
-0.01 and -0.02 volts dc.
(2) Rotate the COARSE ADJ. control to
provide a maximum reading on the
Note: It may not be possible to obtain
the required voltage given in (6) above.
In this case, repeat the procedure given in
(3) through (6) above until the proper
range is obtained. It should take approx-
until the dc voltmeter reading indi-
imately four trials before the specification
cates between 35.7 to 36.3 volts dc
can be met.
(7) The final voltage range after the pro-
Note : It may not be possible to obtain
cedures given in (1) through (6)
this dc reading on the first trial. In this
above are completed should be -0.02
case, adjust R24 to obtain a voltage close
volt minimum (COARSE ADJ. set
to the requirement.
extremely counterclockwise) and 36
(4) Change the COARSE ADJ. control
volts 0.3 maximum.
to its extreme counterclockwise po-
Figure 6-3. Connections for calibration of COARSE ADJ. control.
This test determines whether there is a com-
This test checks the dc output voltage
plete connection between the front output bind-
range which is established by the FINE ADJ.
ing posts and the rear output terminal strip.
control. Connect the equipment and set the
tween the points listed in the chart below.
a. Set up the dc voltmeter for a dc voltage
range of 0.5 volt dc.
To rear terminal
Front panel binding post
b. Adjust the variac to provide an input
of 115 volts ac to the power supply.
C. Connect the dc voltmeter test leads across
the output binding posts of the power supply.
d. Rotate the FINE ADJ. control over its
e. The dc voltmeter should indicate a devia-
tion of approximately 0.8 volt.
Connect the equipment and set the panel
Note: This deviation will cause the voltmeter to
change from a negative to a positive dc value.
this test, it will not be necessary to perform