Hioki 8860-50, Instruction Manual

Page: 166 / 490

6.7 Triggering by Analog Signals
154
Description
About period range settings
The period range settings for period triggering depend on the sampling period
(sampling rate). (Changing the timebase also changes the period setting range.)
The sampling rate setting can be verified on the Status Settings screen.
The upper threshold of the period range cannot be set below the lower threshold,
and vice-versa.
Lower threshold: can be set either to zero, or to at least five times the sampling
period.
Upper threshold: can be set to no more than 2,000 times the sampling period.
To apply a trigger when the frequency increases (shorter period) above the
upper threshold:
Set the period trigger type to [Peri-In] , and the lower threshold to [0] .
The lower threshold is ignored, and triggering occurs when the frequency
exceeds that corresponding to the upper threshold.
To apply a trigger when the frequency decreases (longer period) below the
upper threshold:
Set the period trigger type to [Peri-Out] , and the lower threshold to [0].
The lower threshold is ignored, and triggering occurs when the frequency drops
below that corresponding to the upper threshold.
About the trigger point of the Out-of-Period trigger
Triggering occurs when the period of sequential crossings of the specified refer-
ence voltage exceeds the period range.
The point at which triggering occurs depends on the specified period range and
the period of the measured signal.
Operating Key Procedure
7
Set the trigger filter (as occasion demands) (p. 149).
8
Set the event count (as occasion demands) (p. 149).
When using the Memory function, or when using the Recorder func-
tion with [Timing] set to [Start & Stop]
Set the trigger to Start or Stop (p. 151).
Reference
Voltage Level
Input Signal
Period
T
Triggering occurs when the rising edge
(

trigger slope) of the input signal
crosses the reference voltage level, be-
fore reaching the lower period thresh-
old.
When the input signal period is shorter than the specified lower threshold
(Trigger Slope:

)
Lower Threshold
Upper Threshold
T
Triggering occurs when the upper
threshold period is reached, before the
rising edge (

trigger slope) of the input
signal crosses the reference voltage
level.
Therefore, the trigger point is deter-
mined by the upper threshold of the pe-
riod range.
When the input signal period is longer than the specified upper threshold
(Trigger Slope:

)
Reference
Voltage Level
Input Signal Period