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Model 5245L
Section
III
Tab1e
3-2
Table
3-2.
Irr-Cabinet
Performance Check
(cont'd)
AC INPUT
Repeat
the
procedure given
for
DC
INPUT in steps
a
through
e
with the input signal
connected
to the
AC
Input.
Frequency range
50
MHz
to:
1)
25 Hz
lower
range on
0. 1
attenuator
setting,
2)
i
Hz
lower
range on
l
attenuator setting, with
l
volt input, and
3) 0.5 Hz lower range on
10
attenuator setting,
with
10V input.
2.
GATE
TIME:
selectable
from
1
microsecond
to
10 seconds.
a.
Set
Counter
controls as follows:
SENSITIVITYto.IVOLT
SAMPLE
RATE slightly clockwise out of
POWER
OFF
TIME
BASE
to
1 ps
FIJNCTION
to
FREQUENCY
- LEVEL+ to
PRESET
b.
Connect Frequency Synthesizer output
to
Counter DC SIGNAL INPUT.
c.
Set
Frequency Synthesizer
for
10
MHz
at
0.
l
V rms.
d.
Rotate
TIME BASE switch counterclockwise through
10s gate
position
and
observe
counter reading
for
each
setting.
Record
results
on
test
card.
3.
ACCURACY:
t
1
count,
*
time
base
accuracy.
a.
Set
Counter
controls
as
follows:
SENSITIVITY
to .1
VOLT
SAMPLE
RATE slightly clockwise out of
POWER
OFF
TIME
BASE
to
1
ps
FIJNCTION
to
FREQUENCY
- LEVEL
+
to
PRESET
b.
Allow Counter to warm
up
for
?2
hours.
Lrternal
crystal
should be
stabilized.
c.
Connect
output
of
Frequency Synthesizer
to the Counter DC INPUT.
d.
Set
Frequency Synthesizer
to
50
MHz
at
0.
lV
rms.
e.
With TIME
BASE
switch in the
l
ps position, the Counter should count
50
MHz
r
1
count.
Record
accuracy
on
test
card.
f.
Change
the
TIME
BASE
switch to the
10s gate
position.
The
Counter should count
b0
MHz
r
12 counts.
Record
accuracy
on
test
card.
4-
OUTPUT
DISPLAY:
8
significant figures with decimal point units of measure (kHz
or
MHz).
SELF-CHECK:
counts
10
MHz
for
the
gate
time
chosen
by
the TIME
BASE
switch.
a.
Use Self-Check
procedure; see Figure
6-1,
page
6-4.
b.
Record
results
on
test
card.
SCATING
1.
RANGE:
0
to
50 MHz
a.
Set
Counter
controls as follows:
SENSITIVITY
to
.
lV
SAMPLE
RATE slightly cloclavise out of
POWER
OFF
TIME
BASE
to
10s
FI]NCTION
to
MANUAL START
-
LEVEL
+
to
PRESET
MODE
(rear
panel)
to
SCALER
OUTPUT
(rear
panel)
to
SCALER
RATIO
10
3-3
02349-1
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