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CALIBRATION
NOTES
10.
(CONT)
b.
Check
DC overdrive
recovery:
<0.dmV shtft after
1 second
Change
the
B
INPUT
switch
to
GND,
position
the
trace
to graticule
center
and
change
TIME/CM
to
50uSEC.
Return
the
B
INPUT
switch
to
DC,
wait
10
seconds
and
check
for
0O.5cm
of
shift
between
flat
portion
of
pulses
and.graticule
center.
Repeat
the
step
in INPUT
A by moving
the
TYPE
106
signal
setup
to A INPUT,
DISPLAY
to
A-Vc,
B
INPUT
to
GND
and
TRIGGER
SLOPE
back
to
+.
Change
A
INPUT
switch
to DC
and
again
note
<0.5cm
shift
in
10
seconds
time.
Remove
TYPE
106
signal
setup.
11.
AMPLIFIER
CMRR
a.
Adjust DIFF BAL CMRR:
>20,000:1 @20Hz2
Connect
the
OUTPUT
of
the
LFSWG
to
A and
B INPUT
with
the
Dual
Input
Coupler.
Set
the
INPUT
ATTEN
to
1000,
MILLIVOLTS/CM
to
10,
DISPLAY
to
A-B
and
adjust
the
LFSWG
for
3cm
of
20Hz.
Change
the
B
INPUT
switch
to
DC,
INPUT
ATTEN
to
1
and
MILLIVOLTS/CM
to
1.
Adjust
the DIFF BAL for minimum
ampli-
tude,
<l.5cm.
b.
Adjust 20kH2z CMRR:
>20,000:1
Change
the
INPUT
ATTEN
to
1000,
MILLI-
VOLTS/CM
to
10
and
DISPLAY
to
A-Vc.
Set
the
LFSWG
for
3cm
of
20kHz.
Re-
turn
the
DISPLAY
to
A-B,
INPUT
ATTEN
to
1, MILLIVOLTS/CM
to
1 and
position
the
display
at
graticule
center.
Adjust
C216
for minimum
amplitude,
<l.5cm.
@.
Cheek AC coupled CMRR:
>1,000:1
G6 0H2
Change
the
A and
B INPUT
switches
to
AC,
INPUT
ATTEN
to
1000,
MILLIVOLTS/CM
to
10 and
DISPLAY
to A-Vc.
Set
the
LFSWG
for a 3cm display
of 60Hz.
Re-
turn
the DISPLAY
control
to A-B and
INPUT ATTEN
to 1.
Check
for <3cm of
amplitude.
March 1969
W
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