
7 Analog Modules Time Interval Analyzer
228 System Reference, January 2001
• Pulse Width Measurement
This mode is used to measure the negative or positive
pulse width of a signal.
Figure 103
TrigDelayCnt
Parameters for Pulse Width Measurement
For PW+ or PW-, after the trigger is detected, the TIA
counts rising edges and falling edges, respectively. The
TIA measures the interval from the edge for
TrigDelay-
CntStart
to the edge for
TrigDelayCntStop
.
– For PW+,
TrigDelayCntStart
determines at
which rising edge to start the measurement and
TrigDelayCntStop
determines at which falling
edge to stop the measurement.
For PW-,
TrigDelayCntStart
determines at
which falling edge to start the measurement and
TrigDelayCntStop
determines at which rising
edge to stop the measurement.
In the above example, as
TrigDelayCntStart(1)
and
TrigDelayCntStop(1)
are specified, the TIA measures
from the first rising edge of the signal after the trigger to
the first falling edge of the signal after the rising edge.
NOTE You can set number of sampling points by using POINTS.
In this case, an interval of sampling points is more than 30
µs.
PW+(PW )
Trigger
Signal
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TrigDelayCntStart(1) TrigDelayCntStop(1)
The TIA measures this interval.
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