ETAS ES441.1 - Standard with Qualifying Signal Counter Mode

ES441.1 - User’s Guide44
Functional Description ETAS
5.7.3 “Standard with Qualifying Signal” Counter Mode
Every measurement channel can be assigned any other measurement channel of
the module as a qualifying channel (trigger channel) in the “Standard with qual-
ifying signal” counter mode. Depending on the configuration in the calibration
software, the input signal of the qualifying channel is evaluated and measure-
ment controlled at the assigned measurement channel.
In this mode, the ES441.1 can count edges with the following additional mea-
surement modes:
• Up-counter with measurement control (triggering) in acc. with
– the state of the qualifying signal,
– the edges of the qualifying signal and
• up-/down-counter with control of the counting direction in acc. with the
state of the qualifying signal.
The following counter operating modes can be selected in the calibration soft-
ware for measurement modes with a qualifying signal:
• Resetting the counter after every sampling point or
• Resetting the counter with the edge of the qualifying channel selected in
the calibration software or
• Counter in Free Running Mode. The counter counts from the start of mea-
suring without being reset during measuring. If the count scope (over-
flow) is reached and the measurement is not yet completed, the counter
starts to count from the beginning again. The counter overflows after 2
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signal transitions to be counted.
The following figures show examples of the “Standard with qualifying signal”
counter mode.
Counting with Resetting in acc. with the Qualifying Signal
In this counter mode, the ES441.1 is configured as an up-counter with the
counter being reset by the signal at the qualifying channel (trigger channel).
In this mode, the ES441.1 can count edges with the following measurement
modes in accordance with the configuration in the calibration software:
• Counting the edges when the input signal changes from inactive to active
state
• Counting the edges when the input signal changes from active to inactive
state
• Counting the edges when the input signal changes from inactive to active
state and from active to inactive state and
• Counting the cycles
Note
During the measure phase determined by the qualifying signal, continually
updated counting results are available.