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NOTE:
Care
is
required
when
adjusting
R193. The
display indication
is
random when R193
is
set
to
either
side
of
its
correct
position.
34
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
R150
slowly
clockwise
until
the display
just
becomes
unstable.
Turn
R150
slowly
counterclockwise
until
the
display
is
just
stable,
showing
100.000000
E
6
±0.000001
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
C
Assembly
(Option 41 only)
35
Required
test
equipment
includes a
signal
generator and connector lead
(see
Table
6.1;
Items
4
and
8).
36
Connect
the test
equipment
as
shown
in
Fig.
6.7.
I
10
MHz
EXT STD
SIGNAL
GENERATOR
STD
OUT
INPUT
COUNTER
RF
ABC
M
p
oop
1
Fig. 6.7
Connections
for Input
C
Assembly Adjustment
37
Complete
the following procedure:
(1)
Set
resistor
R27
on
the Input
C
Assembly
board
fully
clockwise.
(2)
Turn
on
the counter.
Select function
FREQ
C. Verify that the
EXT
STD LED
(front panel)
is
lit.
6-23
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