Fluke PM6690 - Measuring Functions; Check of HOLD off Function

–
Activate start arming by keying in the fol
-
lowing sequence:
SETTINGS ® Start Chan ® E
–
The counter does not measure.
–
Apply one single pulse to Ext Arm Input.
–
The counter measures once and shows
10 MHz on the display.
Measuring
Functions
–
Connect a 10 MHz sine wave signal with
approx. 1 V
RMS
amplitude into 50 W via a
power splitter to Input A and Input B, e.g.
from 10 MHz Out on the rear panel. Use
equal cable lengths from the power splitter
to the inputs.
– Recall the DEFAULT settings.
Select the following settings for the
timer/counter via INPUT A and INPUT B:
–
50 W impedance for A and B.
–
MANual trigger.
–
POS slope.
–
Check that the timer/counter performs the
correct measurement by displaying the re
-
sult as shown under the “Display” column
in Table 7-7.
–
Select function via MEAS FUNC.
Check of HOLD
OFF Function
–
Recall the DEFAULT settings.
Select the following common timer/counter
settings for both Input A and Input B via the
hard menu keys INPUT A and INPUT B:
–
50 W impedance.
–
DC coupling.
–
MANual trigger, x1 attenuation.
–
Trigger level = 0.5 V.
–
Press SETTINGS and activate Hold Off.
Select Hold Off On and set the Trigger
Hold Off time to 1 ms.
–
Connect the pulse generator with the fol-
lowing settings to Input A :
–
Period = 100 ms.
– Duration 10 ns.
–
Double pulse.
–
Delay = 1 ms.
–
Amplitude = 1.0 V
PP
, (high level +1V and
low level 0V).
–
Rise time 2 ns.
–
Check the following results:
–
Freq A with Hold Off On = 10 kHz.
–
Freq A with Hold Off Off = 20 kHz.
–
Connect the signal to Input B, select
Freq B and repeat the tests above.
Performance Check
7-10 Measuring Functions