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7α 16 Α
TEXT CORRECTIONS
Section 3
Circuit
D
escription
Page 3-2
CH A NGE :
Under INPUT SOURCE
F
OLLO W ER
c
hange
l
ast sentence to
r
ead :
"R160
i
s
u
sed to
b
alance the input to the
P
olarity Amplifier ."
CHANGE :
Under 2Χ GAIN AMPLIFIER change
p
aragraph to
r
ead :
"The output of
t
he Polarity Amplifier is connected to α gain switching
amplifier,
U
450 .
The gain
o
f U450
i
s set by
t
he control bases, pins 11 and
12 .
In the 5 mV p osition, full drive
i
s provided to the
f
ollowing stage from
pins 6 and 8.
In the 10 mV
p
osition,
R
413 sets the current through
t
he second
o
utput
p
air, pins 5 and 9.
This causes the emitter currents to divide equally
t hrough R440, 8442 and R501, 8503 .
R
501,
R
503 provide the only drive to the
f
ollowing stage, thus forming α 2 Χ gain attenuator .
R
436
p
rovides
l
ow fre-
quency thermal compensation .
R
453 (2 Χ Βα1)
i
s
u
sed to balance the emitter
c
urrents .
CR507 and
R
507
m
aintains α constant
i
nput
v
oltage while switching
between the 5 mV and 10 mV positions ."
Section 2
Operation
P
age 2-2
DELETE :
Under
P
ROCEDURE delete step 5 .
Section 5
Calibration
Pa6e 5-2
C
H
A
N
G
E:
U
nd
e
r
t
i
O
RT F
ORT: ZI
-RU
C2
:D
U
RE,
ste
p
4, c
h
a
n
ge seco
n
d li
n
e to read ;
"exact
ly f
o
u
r
v
ert
i
ca
l divi
s
i
o
n
s w
h
e
n
t
h
e
V
O
LT
S/
DIV"
C
HANGE :
Under jΗURΤ
F
ORM
P
ROCEDURE, step 5, change second line to
r
ead :
"display of exactly five vertical divisions when
t
he "
P
age 5-5
Cέ
l
AΓ
JU
E
: U
nd
e
r
8 A
DJU
S
T L
OW
FR
E;j
U
E
N
CY C ΟΜΡιιΝ S ΑΤΙΟΝ ste
p b .
c
h
a
n
ge seco
nd l
i
n
e
to
r
ead:
"approximately
s
ix vertical divisions of α 1 kHz"
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