ETAS
Digital Input Channels ("DI" Connection)
ES930.1
-
User Guide
40
5.2.5
Time Measurement
Measuring Procedure
In the time measurement, the ES930.1 always acquires the active time and the
inactive time of the signal at the measuring channel. With these measured val
-
ues, the signals can be determined completely in different periods.
The signal at the measuring channel is used for the time measurement inde
-
pendent of signals at other measuring channels. With each measuring channel,
the active and/or inactive duration of the input signal can be determined. The
period for the measurement of this time is configured in the application soft
-
ware. The ES930.1 can determine active and inactive times with the following
time-controlled measuring procedures:
• Measurement during the last period
• Measurement during the last complete cycle
• Measurement between two sampling points
• Measurement until the last current sampling point
The following operating modes can be selected in the application software for
the time measurement:
• Resetting the timer after every sampling point or
• Timer in free running mode. The timer counts from the start of the mea
-
surement without being reset during the measurement. If the counting
scope (overflow) is reached and the measurement is not yet finished, the
timer starts counting again from the start. The overflow of the timer
occurs after (2
32
- 1) signal transitions to be counted or after 2
32
*
15
ns
= 64
s.
The following figures show examples for determining different time sections
from the start of the measurement added up until the current sampling point.