PPA5xx/15xx user manual
8-3
To utilise “range up only” to determine an appropriate
range, it is advisable to make the following settings;
1. Speed, medium
2. Smoothing, fixed time
3. Low frequency mode, ON
4. RANGE, current, range up only
After these settings are made, the device under test
should be connected to the voltage source repeatedly until
the range up only function, no longer “ranges up”.
If at any time you observe the range briefly ranging up
and then ranging back down, you should revert to manual
ranging and perform the tests manually until a suitable
range is found.
After these tests are made, the appropriate range should
be set to manual and smoothing and low frequency mode
disabled.
The user can then select an appropriate update speed for
their tests, if the single cycle “peak RMS current” is of
interest, then setting the window size to that of the
fundamental time period will provide an RMS current
measurement after each cycle is completed.
If you wish to analyse the peak current (this is the highest
single sample point detected) within any cycle, then a
slower speed can be selected and the surge parameter in
RMS mode will provide this value.
For the worst case inrush current the input to the device
under test must be switched on at the worst point in the
cycle (90˚ or 270˚ for a capacitive load, 0˚ or 180˚ for an
inductive load). The Phase Controlled Inrush Switch, or
PCIS, available as an accessory for the PPA5xx/15xx,
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