ETAS
Functional Description
ES441.1 - User Guide
51
The following figures show examples of determining different time sections
with a qualifying signal.
Measuring the Active Time with a Qualifying Signal
Fig. 5
-
26
Measuring the Active Time During an Active Qualifying Signal
5.9
Frequency Measurement
During frequency measurement, the ES441.1 always acquires the duration
within a period or a cycle of the signal at the measurement channel, regardless
of the measure value selected in the calibration software.
The period duration measured directly is the basis of the subsequent frequency
calculation in the ES441.1:
f = 1 / T
The values determined are linked to an additional calculation error coupled to
the resolution of the ES441.1 (see section 5.9.5 on page 54).
5.9.1
Measurement Modes
In the calibration software, parameters and measurement modes can be
selected for frequency measurement for every measurement channel:
• Duration of the measurement
• Evaluation of the signal at the measurement channel regardless of sig
-
nals at other measurement channels (without qualifying signal) or
• Evaluation of the signal at the measurement channel depending on any
other measurement channel of the module which is assigned to the
measurement channel as a qualifying channel (trigger channel)
NOTE
As the edges of the signal at the measurement channel and the signal at the
qualifying channel do not necessarily occur at the same time, a new measure
value only becomes available when the window defined by the qualifying sig
-
nal has been exited.
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