5 Theory and internal operation
90
Figure 5.10: Inrush (waveform and RMS)
Inrush logging starts when the trigger even occurs. 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
- trigger channels
Level: predefined TRMS value
Slope: rise / fall
Slop
e: rise
t
t
Slop
e: fall
Pre-post - buffer: 20 / 80 % of total buffer
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 5.11: Inrush triggering
