METREL MI 2885, Руководство пользователя

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MI 2893 / MI 2892 / MI 2885 Measurement methods
208
voltage U
Rms(1/2)
values (one cycle RMS voltage refreshed each half cycle) is measured for each interval.
In following figures, Level triggering is shown.
Inrush, fluctuation or other event
Measured signal
Inrush record
t
U or I
t
I
R
ms(1/2)
or
U
Rms(1/2)
Trigger Level
Slope: Fall
U or I
Trigger point
Figure 173: Level triggering
Triggering slope
S
lo
p
e
:
r
is
e
t
t
S
lo
p
e
:
f
a
ll
Figure 174: Triggering slope
5.1.20 Transient recorder
Transient recorder is similar to waveform recorder. It stores a selectable set of pre- and post-trigger
samples on trigger activation, but with higher sampling rate:
-
1MHz for MI 2893
- 49 kHz for MI 2892/MI 2885
Recorder can be triggered on envelope or level.
Envelope trigger is activated if difference between same samples on two consecutive periods of
triggering signal, is greater than given limit.