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d
.
Connect the
resistance box
in place of R4
l
(shunt)
e
.
Adjust the
resistance box
until the differential voltmeter
indicates
2
.
5
*
·
0.25 vdc.
f
.
Choose
resistor
R4
l
(shunt)
equal to the resistance value required
in
step e.
5-66
.
ZERO
CURRENT OUTPUT
5
-6 7 .
Proceed
as
follows:
a
.
Connect test setup shown in figure
5-3.
b
.
Connect a
jumper
betw
een the
A
1
and A3 terminals on
the rear terminal
strip
of
the
power supply
.
c
.
Connect the resistance box
in place of R20.
d.
Adjust
the
resistance box
until the voltage
indicated by
the
differential
voltmeter is
between
zero
and 5
.
Omvdc.
e. Choose resistor R20
equal
to
the
resistance
value
required in
step d.
NOTE
If the resistance value required
is
les
s
than
7,
000 ohms
or greater
than 17, 000
ohms, change
R46.
Replace the
original R2 0
.
5-6
8.
BIAS AND REFERENCE LINE REGULATION
5-69
.
Proceed
as
follows
:
a
.
Connect
the variable voltage transformer
between the
input power source
and
the
power supply
power
input. Adjust the variable voltage
transformer to 105
v
ac
.
b
.
Connect the
differential
voltmeter between the
+S a
nd -S terminals
.
c. Connect the resistance box in place
of
R45.
d
.
Tum
front-panel
VOLTAGE controls until the differential voltmeter
indi-
cates 120 vdc.
e
.
Adjust
the variable voltage
transformer to
125
vac
.
5-16
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