ETAS
Functional Description
ES441.1 - User Guide
46
Fig. 5
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18
X1 Counter Mode
“X2” Counter Mode
In counter mode “X2”, the ES441.1 is configured as an up-/down-counter with
the count direction being controlled by comparing the state of the signals at the
measurement channel and the qualifying channel (trigger channel). The inac
-
tive-active and active-inactive edges are counted at the measurement channel:
• The counter is incremented when there are inactive-active and active-
inactive edges at the measurement channel and the states of the mea
-
surement channel and qualifying channel differ,
and
• decremented when there are inactive-active and active-inactive edges at
the measurement channel and the states of the measurement channel
and qualifying channel are identical,
The phase difference of the signals of the two channels determines the count
direction.
In the calibration software, the type of counter resetting can be selected for this
counter mode:
• Resetting the counter after every sampling point or
• Counter in Free Running Mode (no resetting of the counter).
Fig. 5
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19
X2 Counter Mode
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