Hioki 8847, Instruction Manual

Page: 168 / 372

9.3 Triggering by Analog Signals
158
Suppressing Noise Effect
Noise near the trigger level can erroneously increment the event count. Set the trig-
ger filter to avoid such effects.
When Using Noisy Signals for Triggering
Method 1: Enable the trigger filter
By setting the filter width to prevent triggering on noise, triggering occurs only
when the trigger criteria continue to be met for at least the specified width
(interval).
Method 2: Setting an Event Count
If triggering occurs too frequently, an event count can be specified so that a
trigger is accepted only after the specified number of trigger events has
occurred.
Trigger Level
The noise does not cause triggering.
T
Trigger Point
Filter Width
2.5 V
5 V
0 V
Trigger Level
T
1 2 3 4
Example: When the event count is set to [4] (Slope:
↑
)
Event Count
2.5 V
5 V
0 V
Trigger Level
T
1 2 3 4
Event Count
x
Filter Width