5 Theory and internal operation
89
Figure 1: Motor/generator and inductive/capacitive phase/polarity diagram
5.1.15 Waveform
snapshoot
During measurement campaign PowerQ4 has ability to take waveform snapshot. This is
particularly useful for memorizing characteristic or extreme network behavior.
Instruments internally store 10 cycles of samples which can be later observed with
MEMORY LIST menu (see 3.11) or with PowerView.
Each Waveform snapshoot store:
- all displayed measurement for particular connection type (see section 4.3 for
details)
- 10 cycles (1024 samples) of all measurement signals
5.1.16 Inrushes
Inrush logger is intended for analysis of voltage and current fluctuations during start of
motor or other high power consumers. I
½Rms
values per 10 ms (half period) are
measured and average is logged in each preset interval. Inrush logger starts when the
preset trigger occurs.
