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NORMA 4000/5000
Operators Manual
8-20
The following function keys are available:
Function Key Description
→ lin
→ lin % (not for FFT and STD raw mode)
→ log
→ log % (not for FFT and STD raw mode)
→ abs
→ % (not for FFT and STD raw mode)
Switch to linear Y axis (absolute RMS values)
Switch to linear Y axis (relative % to fundamental)
Switch to logarithmic Y axis (absolute RMS values)
Switch to logarithmic Y axis (relative % to
fundamental)
Switch to absolute values in table view
Switch to relative % values in table view
→ mode (FFT and DFT)
→ group (STD)
Toggle calculation between spectrum and integer
harmonics
Step through the available grouping modes for STD
zoom Zoom and shift X axis
→ table
→ graph
Switch to numeric table view
Switch to graphic view
Detail Switch between U, I and P or overview of one phase
Config Configure analysis method and parameters
Press Config function key to configure the calculation method and parameters:
FFT Method: Fixed sampling frequency FFT with Hanning (aka Cosine Bell) windowing
Parameter: Select frequency range
Result: Harmonic spectrum (absolute RMS values only)
DFT Method: Calculation of fundamental and integer harmonics from above FFT by
interpolation
Parameter: Select frequency range
Result: Fundamental frequency and integer harmonics (absolute or relative to
H01)
STD Method: Synchronized FFT compliant to EN61000-4-7 Ed 2.1 standard (rectangular
window)
Parameters: Select # of cycles per analysis interval; select grouping method
Result: Raw harmonic bins or grouped integer harmonics and / or inter-harmonics
Requirement: Valid synchronization frequency
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