Hioki MR8740, Instruction Manual

Page: 203 / 424

8.3 Triggering by Analog Signals
191
7
Cha
pter 8 T
rigger Set
tings
8
5. Glitch Trigger( only) ___________________________________
Triggering occurs when the input signal crosses the trigger level (threshold volt-
age) if its pulse width is shorter than the specified width.
Suppressing Noise Effect
Noise near the trigger level can erroneously increment the event count. Set the trig-
ger filter to avoid such effects.
Type Parameters
[Grit.]
[L] (Level) Sets the level (voltage value) for the trigger. (The setting
can be made in 1/50 increments.)
[S] (Slope) Determines whether triggering occurs when the signal
crosses the threshold (trigger level) on the upslope (rising
edge) or on the downslope (falling edge). (
↑, ↓
)
[Event]
The number of signal rising edge (or falling edge) events
is counted, and triggering occurs when the Event number
set here is exceeded. (1 to 4000)
[Width] Sets the pulse width (time) that is used to determine a
glitch. Triggering occurs when the width is lower than this
value. (The available setting range depends on the sam-
pling frequency. Lower limit: sampling frequency x 2, up-
per limit: sampling frequency x 4000)
Glitch Width
Trigger Level
Input Waveform
Trigger Slope: [
↑
]
T
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