Arming Setup Time; Arming Examples; Introduction To Arming Examples; Measuring The First Burst Pulse - Fluke PM6690 Operator's Manual

Arming Setup Time

The arming logic needs a setup time of
about 5 nanoseconds before the counter is
really armed; see Fig. 5-6.
A r m i n g S i g n a l
M e a s u r e d S i g n a l
Fig. 5-6 Time from active external control
edge until measurement is
armed:
When arming delay is selected, the setup time
is different; see Fig. 5-7. It illustrates the ef-
fect of the 100 ns delay resolution.
A r m i n g S i g n a l
M e a s u r e d
S i g n a l
S e t u p T i m e :
r a n g e f r o m
Fig. 5-7 Time from expired time delay un-
til measurement is armed: . –60
to +40 ns.
Fig. 5-7 shows that a start trigger signal may
be detected although it appears 60 nanosec-
onds before the programmed time delay has
expired. The start trigger signal must come 40
nanoseconds after the programmed time delay
has expired to guarantee correct start of the
measurement.
S e t u p T i m e
P r o g r a m m e d
D e l a y
- 6 0 t o + 4 0 n s
Measurement Control

Arming Examples

Introduction to Arming
Examples
The following arming examples are available:
#1 Measuring the first pulse in a burst
#2 Measuring the second pulse in a burst
#3 Measuring the time between pulse #1
and #4 in a burst
#4 Profiling
Examples 1 and 2 measure the pulse width of
a selected positive pulse in a burst. You can,
however, also measure the period, rise time, or
duty factor by changing FUNCTION, and you
can measure on a negative pulse by changing
trigger slope.
If you do not know the basic parameters of the
signal to be measured, we recommend to use
an oscilloscope for monitoring. Then you can
estimate roughly how to set trigger slope,
arming slope and arming delay.
#1 Measuring the First Burst
Pulse
S y n c E
I n p u t A
Fig. 5-8 Synchronizing the measurement
so that the pulse width of the first
pulse is measured.
In the first example we will measure the width
of pulse #1 in a repetitive pulse burst. In this
example, a synchronization signal (SYNC)
with TTL levels is also available. See Fig. 5-8.
However, the quick and simple method de-
Arming Setup Time 5-9