MI 2792 PowerQ4 Plus
Theory and internal operation
118
Inrush, fluctuation or other event
Measured signal
Inrush logger
I
t
U or I
t
I
½Rms
Trigger Level
Slope:
Figure 5.12: Inrush (waveform and RMS)
Storage buffer is divided into pre-buffer (measured values before trigger point) and post-
buffer (measured values after trigger point).
Triggering
Input: I
1
, I
2
, I
3
, I
N
U1, U2, U3, U
N
- trigger channels
Level: predefined TRMS value
Slope: rise / fall / both
Slope: rise
t
t
Slope: fall
Pre-buffer: 0 to (Total buffer – 1)
Pre-buffer is treated as negative time
Total buffer
Start logging
Stop logging
Trigger point
pre-buff.
post-buff.
Pre-buffer and post-buffer
Figure 5.13: Inrush triggering
