Fluke PM6690 - Measuring the Second Burst Pulse

Set the time delay to a time longer than the
duration of a pulse burst and shorter than the
repetition time of the pulse bursts.
See Fig. 5-10.
Use the same test setup as in the preceding ex
-
ample but enter a suitable Start Arm Delay.
#2 Measuring the Second
Burst Pulse
The next task is to measure the width of the
second pulse in the pulse train from example
1. How can we now synchronize the measure-
ment start to the start of the second pulse? In
this case auto-synchronization, without the
use of the arming function, cannot work.
Auto-synchronization can be used only to syn-
chronize on the first trigger event in a burst.
Depending on the SYNC signal’s position rel
-
ative to the burst, and the duration of the
SYNC signal, the measurement can be per
-
formed with or without using arming delay.
If the trailing edge of the SYNC signal occurs
after the leading edge of the first pulse but be
-
fore the second pulse in the pulse burst, then
normal start arming without delay can be
used. Select triggering on positive slope on in
-
put A and negative slope on input E. The
slope for the active arming channel is set in
the SETTINGS ® Arm ®Start Slope
menu.This example is shown in the following
figure:
If the SYNC-pulse timing is not so suitable as
in the above measurement example, then arm
-
ing must be used combined with a time delay;
see the following figure:
Use the same test setup as in the preceding ex
-
ample but enter a suitable Start Arm Delay.
The set delay time must be set to expire in the
gap between pulse #1 and #2.
Arming Examples 5-11
Measurement Control
S y n c E
I n p u t A
D e l a y
Fig. 5-10 Synchronization using start
arming with time delay.
S y n c E
I n p u t A
S t a r t A r m i n g
Fig. 5-11 If the trailing edge of the sync
signal appears before the sec
-
ond pulse, use arming without
delay.
S y n c E
S t a r t A r m i n g
I n p u t A
D e l a y
Fig. 5-12 Use arming with delay if the
trailing edge of the sync signal
appears too late to be useful.