HP 5245L Service Manual

Model
5245L
Table
3-2.
In-Cabinet Performance
Check
(cont'd)
3.
PERIOD
MEASUREMENT
ACCURACY:
+
1
count
t
time base
accuracy
*
trigger
error where the
trigger
error is
expressed as
x0,3Vo
over
l
period
divided
by the
number of
periods
averaged
for
signals
with a
signal to noise
ratio of
greater
than 40
dB.
a. Set Counter
controls
as follows:
SENSTTTIIYto.l VOLT
SAMPLE RATE to
slightly cloclnvise out
of
POWER
OFF
TIME
BASE to
. 1
psec
FIINCTION
to
1
PERIOD AVERAGE
-
LEVEL +
to
PRESET
b. Connect
output
of
Frequency
Synthesizer to
Counter
DC
SIGNAL INPUT.
c. Set Frequency
Synthesizer
for
1
MHz
at 0.
1
V rms.
d.
Counter
should display
1
ps
t
1
count. Record results
on test card.
4. PERIODS
AVERAGED:
1 to
105
periods
in
decade
steps.
a. Set
Counter
controls
as follows:
SENSITIVITYto.I VOLT
SAMPLE
RATE
slightly
cloclnvise
out
of POWER
OFF
TIME
BASE to
. 1
psec
FUNCTION
to
1
PERIOD
AVERAGE
-
LEVEL +
to
PRESET
b.
Connect output
of
Frequency
Synthesizer
Counter
DC SIGNAL
INPUT.
c. Set Frequency
Synthesizer
for
l
MHz
at 0.
1V
rms.
d.
Rotate FLNCTION
switch
from
1
PERIOD
AVERAGE
through
100K
(t051
PERIOD
AVERAGE
and
observe
count in
each
setting. Record
results on
test card.
5. OUTPUT
DISPLAY:
8
significant figures
with decimal
point
and
units
of measure
(sec,
ms,
or
ps).
This is
checked
by
mark
test
card
OK.
Item
2
,
FREQUENCY
RANGE MULTIPLE
PERIOD.
If
check is
satisfactory,
6.
SELF
CHECK:
Gate
time is
10
ps
to 1 sec
(periods
averaged
of
100
kHz);
counts
100
kHz from
the
time
base.
use
self check
rable
6-5,
page
6-5.
Record
results
on test
card.
FREQUE NCY
RATIO'UIEASUREffIENTS
1.
F1
FREQUENCY
RANGE:
0 to 50
};,IHz
a,
Set Counter
controls
as follows:
SENSITIVITYto.IVOLT
SAMPLE
RATE
slightly cloclnvise
out of POWER
OFF
TIME
BASE to
EXT.
FUNCTION
to
1
PERIOD
AVERAGE
-
LEVEL +
to
PRESET
b.
Connect Frequency
Synthesizer to Counter
TIME
BASE EXT
connector
and
set
output
to
0.
1V
rms.
Connect
HP 5245L
100 Hz
OUTPUT
STD
FREQ
to
Counter
DC SIGNAL
INPUT
(F2
INnUT).
Observe
ratio
ot
F/t
MHz
by
selecting
Fl
on
Frequency
SynthesLzer
as
shown
in
table on the
following
page;
record
readings.
Section
III
Table 3-2
02349-1
3-5

HP 5245L Specifications

General

Brand	HP
Model	5245L
Category	Cash Counter
Language	English