Hioki MR8740-50, Instruction Manual

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111
Triggering the Instrument Using Analog Signals (Analog Trigger)
4. [Period-in] trigger and [Period-out] trigger
The instrument measures periods of an input waveform, which are time lags between consecutive
two points at which an input voltage crosses the specified level in the positive or negative direction.
The period-trigger condition is satisfied when a period is inside the specified range (In) or outside
the specified range (Out).
An trigger point lags behind the actual trigger point by one sample.
These triggers cannot be specified either when Model 8970, Model MR8990, or Model U8991 is
used.
Refer to “Setting of the period range” (p. 112) and “[Period-out] trigger” (p. 112).
Level
Period upper limit
Period lower limit
Upper limit value
Out of the range
Within the period range
Setting Description
Level –f.s. to +f.s.
Default: 0 
Allows you to enter a level for detecting the
rising or falling slopes of a signal.
Slope With OR
 , Allows you to choose which of the following
points to use to calculate periods: two
consecutive points at which a signal crosses
the specified level in the positive direction; or
those in the negative direction.
With AND HIGH  , LOW
Period lower
limit *
Zero or 5 times the sampling period
or longer
The lower limit of periods cannot be set to a
value higher than that in the [Period upper
limit] box. When the lower limit of periods is
set at [0] , the instrument ignores the value in
the [Period lower limit] box, and the period-
trigger condition is satisfied using the value in
the [Period upper limit] box only.
Period upper
limit *
20,000 times or less of the sampling
period
The higher limit of periods cannot be set to
a value lower than that in the
[Period lower
limit] box.
Event With OR 1  to 4,000 Allows you to enter the number of events.
The instrument counts the number of times
the period-trigger condition is satisfied. Only
after the count reaches the specified number of
events, an analog trigger is generated.
With AND
Not available
Filter Off  , 10 to 10,000 Allows you to enter a filter width in the number
of samples. Only after the period-trigger
condition is continuously satisfied during the
specified period, an analog trigger is generated.
Specifying this option prevents the instrument
from being unintentionally triggered due to
noise.
*: Ranges of values that can be set in the period lower limit and period upper limit boxes varies in conjunction
with the sampling rates (periods).
5
Configuring the
Trigger Settings