HP 5245L Service Manual

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

HP 5245L Specifications

General

Brand	HP
Model	5245L
Category	Cash Counter
Language	English