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(3)
Set the
signal
generator output
to
1
GHz
at
a
level of 5.0
mV
r.m.s.
(4)
Adjust
R27
slowly
counterclockwise
until
the
GATE
LED
just starts
flashing
and
the display
shows 1000.00000 E
6
±0.00001
E
6.
(5)
Turn
off the
RF
output
of the signal
generator.
Decrease
the output
level to
4.5
mV
r.m.s.
(6)
Turn on
the
RF
output
of the signal generator.
Verify that the 1994
is
not
counting.
If
it
is,
repeat steps
3
through
6.
(7)
Turn
off the
counter
and disconnect
the
test
equipment.
Internal
Frequency
Standard
-
Routine
Calibration
38
Required
test
equipment
includes
a
frequency standard
(see
Table
6.1;
Item
1).
NOTE:
If
either
Option
04
A
or
04E
ovenized frequency standard
is
installed,
allow the
counter
to
warm
up
for
one hour (switched
to
standby,
if
required)
before
making
any adjustment.
39
Complete
the following procedure:
(1)
Turn
the counter
on.
Select function
FREQ
A. Verify
that
00000000
is
displayed.
If
Option
04E
is
installed,
press the
RESOLUTION
f
key
until
000000000
is
displayed.
(2)
Connect
the
test
equipment
as
shown
in
Fig
6.8.
10
MHz
Fig
6.8
Connections
for Internal
Frequency
Standard
Adjustment
6-24
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