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Table
5-6.
Checks
and
Adjustments
After
Replacement
of
Semiconductor
Devices
5-41
I ~ E T E R
ZERO
I
5-42
~ i o c e e d a s follows to mechanically zero
meter:
Adjust
R2
4
R2
4
R36,R37
R36,R37
R36,
R37
a!
Turn
off
instrument
(after'it
h a s
reached
I
normal
operating
temperature)
and allow
30
sec-
I
onds
for
a l l
capacitors
to
discharge.
b!
Insert
sharp
pointed object
(pen
point
or
I
awl)
int,o
the
small indentation
near
top
of
round
black
plastic
d i s c
located
directly
below meter
face.
c.
Rotate
plastic
d i s c
clockwise
(cw)
until
I
meter
reads
zero,
then
rotate
ccw
slightly
in
I
order
to,
free
adjustment
screw
from
meter
suspen-
sion.
Bf
pointer
moves,
repeat
s t e p s
b
and
c.
I
i
Check
Line
and
load
regulation
zero
volt
output
Line
and
load
regulation.
Current
limit
Reference
voltages
Current
limit
Programming
current
Programming
current
Line
and
load regulation
zero
volt output
Reference voltages
Programming
current
Output
voltage
-
1
volt
a t
point
12
Line
and
load
regulation
Programming
current
Output
voltage
I
Reference
~ e s i b n a t o r
I
I
""t2
Q4
I
Q5
O6
I
I
CR1,
CR3
I
CR2,
CR4-
~ ~ 6 4 ~ ~ 1 9 ,
CR2
q
CR8
1
CR9
1
I
CRl
g
I
CR27,
CR2
9
I
I
CR2
8
I
5-44
T?
adjust
the
electrical
meter
accuracy,
proceed
a s
follows:
Function
Voltage
feedback
amplifiers
Constant
voltage
and
current
limit
driver
Reference
s e r i e s
regulator
Constant
programming
current
amplifier
Protection
diodes
Seri.es
reference
diodes
Series
regulator protection
diode
Bias
diode
Series
regulator
Q6
protection
diodes
Series
regulator
protection
diode
a.
Connect the 100: 1 attenuator and the dif-
ferential voltmeter a s illustrated in Figure 5-2.
b. Adjust the VOLTAGE RANGE switch and
the VERNIER until the differential voltmeter indi-
c a t e s 12 volts.
c. Adjust R46 until the front panel voltmeter
indicates exactly 1200 volts.
5-45 OUTPUT VOLTAGE (PROGRAMMING CURRENT)
ADJUSTMENT
5-46 To adjust the output voltage, proceed a s
follovvs:
a.
Connect the 100: 1 attenuator and the
differential voltmeter a s illustrated in Figure 5-2.
b.
Turn the VOLTAGE RANGE switch to
1500 Vdc and the VERNIER control fully counter-
clockwise.
c.
Remove R36 and R37 and connect the
decade box ( s e t t o approximately 200 ohms) to the
standoff terminal i n place of R37.
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