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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
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