Fluke PM6681 - Page 15

Check
on
HOLD OFF
function
“
Verify
that the
counter counts correctly. (The last
digit
will be
unstable).
Press PRESET on the timer/counter.
Select the following settings
for
the
timer/counten
-
Press CHECK.
-
Select
PER
A.
-
The
counter
should
show 10 s*.
-
Select HOLD OFF.
-
The counter should
show 1
s*.
-
Set the Hold off
time
to
500"®
s.
-
The counter should show 500 s*.
*
The
LSD
digits
may vary.
Options
Check on Prescalers
To verify the specification of the HF inputs in the
instru-
ment, perform the measurements below.
•
PM
9621
Required Test Equipment Suggested instrument
HF
signal generator
Fluke 6062A
Table
2-10
Test equipment for 1.3 GHz
HF-input
—
Connect the output
of
the signal generator to
the HF in-
put of the counter.
-
Connect
the
10
MHz REFERENCE
OUT of
the
generator
to the REFERENCE
IN
at the rear panel
of
the
counter.
Setting for the timer/counter after Preset.
-
Function
=
FREQ
C.
-
EXT REF.
Figure
2-4
Connect the output of the signal generator
to the HF-input of the counter.
—
Generate a sine wave in accordance with the correspon-
ding
table below.
Frequency
Amplitude Pass/Fail
MHz
mVpiv/ip;
dBm
70-900
10
-27
-1100
15
-23
-1300
40
-15
Table
2-11
Sensitivity
of PM
9621
•
PM
9624,
PM
9625B,
or
PM
9625
Required
Test Equipment Suggested instrument
HF signal generator
Wiltron
6717B-20
Table
2-12
Test equipment for
2.1, 4.2,
and 4.5 GHz HF-in-
puts
-
Connect the output of the signal
generator
to
the HF in-
put of
the counter.
“
Connect the 10
MHz
REFERENCE OUT
of
the generator
to the REFERENCE IN at the rear panel of the
counter.
Setting for the timer/counter after Preset.
“
Function
=
FREQ
C.
-
EXT
REF.
-
Generate
a sine wave in accordance with the correspon-
ding tables below.
Frequency Amplitude
Pass/Fail
MHz
mVpivict
dBm
100-300 20
-21
-2500
10
-27
-2700
20
-21
Table
2-13
Sensitivity of PM
9624.
Frequency
Amplitude Pass/Fail
MHz
dBm
150-300
20
-21
-2200
10
-27
-3500
15
-23.5
-4200
25
-19
Table
2-14
Sensitivity
of
PM
9625B.
Frequency
Amplitude Pass/Fall
MHz
mVRMp;
dBm
150-300
20
-21
-2500
10
-27
-3500
15
-23.5
-4200
25
-19
-4500
50
-13
Table
2-15
Sensitivity of PM
9625.
-
Verify
that the counter counts
correctly. (The
last digit
wili be unstable).
Performance
Check,
Check on HOLD OFF
function
2-7