Delphin ProfiMessage, Руководство по оборудованию

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Profi Message
The trigger signal is best received from one of the four digital inputs. One of the
eight analogue inputs may alternatively be used with a preset threshold.
Note on above diagram:
In example a) the trigger signal starts recording. Recording stops when the record-
ing time parameter has been reached (refer to the next section).
In Examples b) and c), the trigger signal controls starting and stopping of the
recording – irrespective of the trigger pulse parameter. In the event that the stop
trigger does not occur, recording is limited to the recording time parameter (refer
to next section).
Recording parameters
A vibration signal is recorded with respect to the time signal according to three
parameters: sampling frequency, number of samples and recording time. A fre-
quency spectrum is determined according to the parameters: frequency range,
number of lines and frequency resolution.
Parameters are closely related to each other. The following table provides an over-
view:
Parameter Symbol Calculation Example
Sample rate Sample rate fs — 2560 Hz
Number of
samples Number of
samples
ns — 2048
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Delphin Technology AG
Dezember 2015
Profi Message Manual