–
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
INPUT A and IN
-
PUT B
:
–
50 W impedance.
–
DC coupling.
–
MANual trigger, x1 attenuation.
–
Press
SETTINGS and activate Hold Off. Select Hold Off
On
and set the Trigger Hold Off time to the minimum
value 20 ns.
–
Connect the rear panel output marked 10 MHz OUT to
Input A.
– Increase the
Trigger Hold Off time in steps by means of
the
UP cursor key and note the results:
If Trigger Hold Off ti me <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.
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
Meas Ref from the SETTINGS menu and select
External.
–
Choose
Freq C from the MEAS FUNC menu.
–
Generate a sine wave in accordance with the tables.
–
Verify that the counter is counting correctly. (The last
digits will be unstable)
Performance Check, Check of HOLD OFF Function 2-7
Frequency Amplitude P/F
MHz mV
RMS
dBm
100-300 20 -21
300-2500 10 -27
2500-2700 20 -21
2700-3000 40 -15
Table 2-9 RF input sensitivity,
3 GHz Option.
Frequency Amplitude P/F
MHz mV
RMS
dBm
300-500 20 -21
500-3000 10 -27
3000-4500 20 -21
4500-6000 40 -15
6000-8000 80 -9
Table 2-10 RF input sensitivity,
8 GHz Option.
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