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CALIBRATION
NOTES
/.
GRID
CURRENT
AND MICROPHONICS
a.
Cheek
grid
current:
<InA
a.
Approx.
3mm
of
trace
shift
can be
caused
by
a leaking
input
diode
Remove
SAC
output
cable
from
the
.
:
:
and
is
considered
excessive.
B INPUT.
Change
the
DISPLAY
switch
to A-Vc
and
the MILLIVOLTS/CM
to
1.
Change
both
AC-DC-GND
switches
to
GND
and
the
INPUT
ATTEN
to
l.
Center
the
trace
with
the
POSITION
control.
Change
the
A AC-DC-GND
switch
to
DC.
Check
for <InA
(lcm)
trace
shift
caused
by
the
nuvistor.
Return
A AC-DC-GND
switch
to
GND.
Repeat
for
B
INPUT.
b.
Check microphonics:
<ImV
Change
the plug-in
scope
TIME/CM
switch
to
lmSEC.
Use
the
micro-
shock
hammer
on
the
top,
front,
center
of
the
plug-in
scope.
Check
for
<lcm
of
microphonics,
with
no
ringing.
e.
Check trace drift:
<0.dem
Set
the
TYPE
W
DISPLAY
to
A-Vc.
Change
the
TYPE
76TU
to
103.5V,
wait
1 minute.
Position
the
trace
to
graticule
center.
Change
the
TYPE
76TU
to
126.5V,
wait
1 minute.
Check
for <0.5cm
trace
shift
from
graticule
center.
Change
the
DISPLAY
switch
to Bc-B
and
repeat
for
B INPUT.
Return
TYPE
76TU
to
115V.
d.
Check notse:
<&mm wtth <Imm jttter
Check
for
trace
width
of
3mm
or
less
with
Imm
or
less
of .trace
jitter.
Change
the
DISPLAY
switch
to A-Vc.
Check
for
trace
width
of
3mm
or
less
with
lmm
or
less
trace
'jitter.
8.
AMPLIFIER
TRANSIENT
RESPONSE
a.
Setup
Connect
TYPE
106 +OUTPUT--GR
to BNC
Adapter--502
cable--502
Terminator--
Dual
Input
Coupler--A&B
INPUT.
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