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i
1
10
MHz
EXT STO
SIGNAL
GENERATOR
[
STO
OUT
INPUT
COUNTER
j
RF
ABC
?
1
c
)
0
o
Fig.
6.4
Connections
for Input
A
System Adjustment
(5)
Verify that the
EXT
STD LED
(front
panel)
is
lit,
and
that
INPUT A TRIG LED
is
flashing.
(4)
Set the signal
generator output
to
100
MHz
at
a level
of 3.0
mV
r.m.s.
(6)
Adjust
R192
to
obtain the
most
stable display of 100.0
E
6
±0.1
E
6,
with the
GATE LED
flashing.
NOTE:
Care
is
required
when
adjusting
R192.
The
display indication
is
random when R192
is
set
to
either
side
of
its
correct
position.
30
Complete
the following
procedure:
(1)
Turn
off
the
RF
output
of
the
signal
generator.
(2)
Press the
RESOLUTION
f
key
five
times
until
00000000
is
displayed.
NOTE:
Disregard
any
noisy
readings
that
may
be experienced.
(3)
Turn on
the
RF
output
of
the
signal
generator.
(4)
Increase the generator's
output
to 13
mV
r.m.s.
(5)
Adjust
R149
slowly clockwise
until
the display
just
becomes
unstable.
Turn
R149
slowly
counterclockwise
until
the
display
is
just
stable,
showing
100.000000 E 6±O.QQ0Q01
E
6.
(6)
Reduce
the generator's
output
to
7
mV
r.m.s.
Verify
that the
GATE LED
stops
flashing.
If
flashing continues,
repeat
steps
4
through
6.
(7)
Turn
off the
counter and disconnect
the
test
equipment.
Input
B
System
31
Required
test
equipment
includes a signal generator
(see
Table
6.1;
Item
4).
32
First,
set resistors
R150
fully
counterclockwise and
R193
to
its
midposition.
R193
is
located
inside the
screened
module
(access holes provided) as
shown
in
Fig
6.5.
6-21
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