Delphin ProfiMessage, Hardware Manual

Page: 289 / 322

Profi Message
Window function
Enables a weighting function for the time signal. The weighting is applied prior to
running the FFT analysis. Options are "Hanning" (recommended for high fre-
quency precision) or "Flat Top” (recommended for high amplitude precision).
Compression
Frequency spectrums can be compressed prior to transmission. This can reduce
transmission speed and increase storage capacity in the data logger memory.
Select the required
Method :
l
None
The frequency spectrum is transmitted without compression.
l
Log. compression (µ-law)
Amplitude values undergo logarithmic compression, whereby the com-
pression factor is 2:1. The amplitude error following decompression is ±2%
max.
Averaging
A frequency spectrum can be averaged within the device via measurement cycles
n = 2
…
32.
The intermediate block values setting transmits a frequency spectrum of the cor-
responding averaging level (1, 2, 3,
…
, n) for each measurement.
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Delphin Technology AG
Dezember 2015
Profi Message Manual