PPA5xx/15xx user manual
8-1
8 Application specific modes
Select the application specific options from the APP menu.
8.1 Lighting ballast
Electronic lighting ballast waveforms consist of a high
frequency carrier signal modulated by the line frequency.
The PPA5xx/15xx measures the line frequency
independently of the input waveform frequency and
synchronises the measurement period to the line
frequency.
The carrier frequency measurement ignores any ‘dead
band’ around the zero crossing of the ac line to compute
the actual switching frequency of the ballast.
Both the frequency measured on the input waveform and
the frequency of the line input are displayed.
As the switching frequency can vary over the cycle, the
analysis frequency of the DFT measurement is continually
adjusted to give an optimum measurement of the
fundamental and harmonics. The response of the tracking
algorithm can be adjusted to suit the ballast being
measured:
Fixed time (no adjustment)
Fast
Medium
Slow
To select lighting ballast mode, press the APP key, select
the mode with the cursor keys, move down to the ‘default
settings’ option and press ENTER. The defaults are loaded,
and the particularly important parameters can then be
changed.
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