Check Of Hold Off Function; Rf Options - Fluke PM6690 Service Manual

– Check that the timer/counter performs the correct mea-
surement by displaying the result as shown under the
"Display" column in Table 2-8.
– Select function via
MEAS FUNC
Check of HOLD OFF
Function
– Recall the DEFAULT settings.
– Select Period Single A .
Select the following common timer/counter settings for both
Input A and Input B via the hard menu keys
:
PUT B
W impedance.
–
50
– coupling.
DC
– ual trigger, attenuation.
MAN x1
– Press and activate
SETTINGS
and set the
On Trigger Hold Off
value 20 ns.
– Connect the rear panel output marked 10 MHz OUT to
Input A.
– Increase the
Trigger Hold Off
the UP cursor key and note the results:
If Trigger Hold Off time <100 ns the result is about 100 ns,
i.e. the same value as without Hold Off.
If Trigger Hold Off time >100 ns the result is about 100 ns +
Trig Hold Off time.
– Connect the signal to Input B, select
Period Single B and repeat the tests above.
and
INPUT A IN-
. Select
Hold Off Hold Off
time to the minimum
time in steps by means of

RF Options

Input C Check
To verify the specification of the different RF prescalers
(Input C), use the following basic test setup:
– Connect the output of a signal generator covering the
specified frequency range to the RF input of the counter.
– Connect the 10 MHz REF OUT from the generator to
the EXT REF IN on the rear panel of the counter.
– Choose from the
Meas Ref
.
External
– Choose Freq C from the
– Generate a sine wave in accordance with the tables.
– Verify that the counter is counting correctly. (The last
digits will be unstable)
Frequency Amplitude
MHz mV
RMS
100-300 20
300-2500 10
2500-2700 20
2700-3000 40
Table 2-9
RF input sensitivity,
3 GHz Option.
Frequency Amplitude
MHz mV
RMS
300-500 20
500-3000 10
3000-4500 20
4500-6000 40
6000-8000 80
Table 2-10
RF input sensitivity,
8 GHz Option.
Performance Check, Check of HOLD OFF Function 2-7
menu and select
SETTINGS
MEAS FUNC menu.
P/F
dBm
-21
-27
-21
-15
P/F
dBm
-21
-27
-21
-15
-9