PPA45xx Quick User Guide
Page 20
Lighting Ballast
Electronic lighting ballast waveforms consist of a high
frequency carrier signal modulated by the line
frequency. The instrument 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 is displayed, the output of the ballast
should always be connected to Phase 1
Default Settings
All default parameters will be selected when “ENTER”
is pressed
Frequency Tracking
Selectable tracking speed from drop down menu
Efficiency
(Not applicable to the PPA4510) Efficiency can be
measured between selected channels from the drop
down menu
Inrush Current
Inrush current (surge) requires very fast sampling to
catch the highest instantaneous value. Measurements
must be made under conditions of manual ranging
and with the voltage applied to the instrument. Then
when the load is switched on the highest peak value
can be detected. If the peak current is unknown then
a minimum of two tests should be performed, one to
set the range and a second test to capture the inrush
current
Default Settings
All default parameters will be selected when “ENTER”
is pressed
Minimum Range
Select the minimum current range applicable from the
drop down menu
Auxiliary Device
Allows PCIS inrush switch to be used for
measurement of Inrush Current. If selected phase
offset and waveform cycle for results will require
setting