Delphin ProfiMessage, Hardware Manual

Page: 279 / 322

Profi Message
Measurement accuracy
Measurement accuracy is determined by acquisition of the fn basic frequency via
the digital frequency input.
Select the settings Sampling frequency and Number of samples to enable acquis-
ition of more than one but less than ten signal periods in a time signal block. This
achieves an accuracy of ±1
…
5 degrees for the phase angle.
The following table is for a frequency spectrum with 2048 and 4096 lines.
Acquired sig-
nal periods
>1 2 5 10 20
Measurement
deviation
phase angle
±1 degrees ±2 degrees ±3 degrees ±5 degrees ±10 degrees
The rule of thumb for a measurement deviation of ±5 degrees:
Examples
Sample rate 2560 Hz 2560 Hz 1280 Hz
Number of samples 2048 4096 4096
Input signal range for a measurement devi-
ation of ±5 degrees 1.25 to
25 Hz 0.625 to
12.5 Hz 0.3125 to
6.25 Hz
Converting a sine definition to a cosine definition
279
Delphin Technology AG
Dezember 2015
Profi Message Manual