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SECTION V
ALIGNMENT
PROCEDURE
5.1
INTRODUCTION
The Model 113
is
a stable, reliable
instrument
which should
give
trouble-free service.
If
a
component
is
replaced,
however, alignment may be necessary, depending on
what
circuit
the
component
belongs to. For locating
components
and
testpoints
mentioned
in
this section. refer
to
the
photograph and
the
circuit-board
layout
diagram
in
Section
VII.
5.2
PRELIMINARY
Before operating from ac line power, make sure the
rear-panel switch
is
in
the
position indicating
the
line
voltage
to
be used, and be sure
the
proper size line fuse
is
installed
(1/16
A for
115
V operation
or
1/32
A for
230
V
operation, located
on
inside rear panel). Then
connect
the
ac line power and energize the instrument.
NOTE: This alignment procedure assumes
that
no compo-
nents
in
the
instrument
are defective. The technician should
make sure of this by making
the
appropriate voltage and
signal checks before and during alignment.
5.3 EQUIPMENT NEEDED
(1) Sinewave generator,
500
kHz range, low distortion.
(2) Oscilloscope,
500
kHz frequency response and
mV
/cm
sensitivity.
(3) Precision rms voltmeter, 0.1 % accurate, such as
Hewlett-Packard Model
400
EL.
(4) Dc voltmeter, capable
of
measuring 0 V
to
within 1
mV, and capable
of
measuring
11
V
to
within
50
mV.
(5) Variable
dc
supply, floating
output,
12 V max.
(6)
Attenuators,
2000:
1 and 10:
1,0.1%
accurate.
5.4 A2 FET GATE SOURCE ZERO ADJ.
(1)
Use
a
short
clip-lead
to
connect
the
wiper
of
the
HF
Roll
off
switch
to
ground;
connect
at
the
switch.
(2)
Set
the
Gain switch
to
10
4
•
(3) Monitor the
output
BNC with
the
dc
voltmeter.
(4) Adjust R211 for 0 V (±2 mV).
(5) Remove the clip-lead.
('
5.5 COMMON-MODE REJECTION ADJ.
(1)
Set
both
input
coupling switches
to
their
ground
positions.
V-1
(2)
Set
the
LF Rolloff switch
to
DC.
(3) Adjust
the
front
panel
dc
zero control for 0 V
dc
at
the
output
BNC.
(4) Monitor the
output
with
the
oscilloscope.
If
oscilla-
tion
is
present, adjust C200
to
just
beyond
the
point
where oscillation stops.
(5)
Connect
a 4 V pk-pk
100
Hz
sinewave signal
to
the
A
and B inputs (common mode).
(6) Set both
input
coupling switches
to
DC.
(7)
Set
the
gain switch
to
10k.
(8)
Set
the
HF
Rolloff switch
to
1 kHz.
(9)
Adjust
R118
(eMR
ADJ.) for
minimum
100
Hz
out-
put,
as
indicated
by
the
oscilloscope.
(10) Adjust
the
signal generator
to
2 V pk-pk,
100
kHz.
(11)
Set
the H F Rolloff control
to
300
kHz.
(12) Adjust
the
gain
as
necessary
to
obtain
a display on
the
oscilloscope (still
connected
to
the
output).
(13) Adjust
Cl05
and
Cl16
for minimum
100
kHz
on
oscilloscope.
(14) Adjust
the
signal generator
to
2 V pk-pk,
300
kHz.
(15)
Set
the
Model
113gaintol00.
(16) Adjust
C1
08
for minimum signal
output.
(17) Repeat steps
10
through
16
several times for
optimum
common-mode rejection.
5.6
GAIN
CALIBRATION
(1) Connect the
2000:
1
attenuator
to
the
output
of
the
signal generator, and
connect
the
output
of
the
attenuator
to
the
Model 113's A input.
(2)
Set
the
113's A
input
coupling switch
to
DC,
the
B
coupling switch
to
GND,
the
HF Rolloff switch
to
300
kHz, LF Rolloff switch
to
DC,
and
set
the
Gain switch
to
2 k (cal).
(3) Monitor the
output
of
the
signal generator with
the
precision rms voltmeter;
the
attenuator
must
remain
connected
to
the
signal generator so
that
a change
of
load does
not
occur
that
would change
the
signal
amplitude. Adjust
the
rnis voltage
to
1 V (exactly) @
400
Hz.
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