Hioki MR8740-50, Instruction Manual

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112
Triggering the Instrument Using Analog Signals (Analog Trigger)
Setting of the period range
The period range settings of the period trigger vary depending on the sampling periods (sampling
rates).
(The setting value of the period range also changes in conjunction with the sampling period [sampling
rate] setting.)
Select
[Status] > [Condition] > [Sampling]
and check the sampling rate setting.
To set the period-trigger condition such that it is satisfied when an input frequency exceeds
the upper limit value (when the period becomes shorter)
Set [Type] to [Period-in] and set [Period lower limit] at [0] . The instrument ignores a value in
the [Period lower limit] box, and the period-trigger condition is satisfied when an input frequency
exceeds a value in the [Period upper limit] box.
To set the period-trigger condition such that only when an input frequency falls below the
upper limit value (when the period becomes longer):
Set [Type] to [Period-out] and set [Period lower limit] at [0] . The instrument ignores a value in
the
[Period lower limit]
box, and the period-trigger condition is satisfied when an input frequency
falls below a value in the [Period upper limit] box.
[Period-out] trigger
The instrument calculates periods by monitoring times when an input signal crosses the specified
level in the positive or negative direction, and the period-trigger condition is satisfied when a period
gets out of the specified period range.
Points at which the period-trigger condition is satisfied varies depending on the specified period
range and the period of a measuring object.
When an input signal period is shorter than the specified lower limit of periods (with the
slope set to positive [ ] ).
Level at
time
Period of the input signal
Period lower limit
The period-trigger condition is satisfied when a rising
slope of an input signal crosses the specified level
before the lower limit of periods elapses.
When an input signal period is longer than the specified upper limit of periods (with the
slope set to positive [ ] )
Period of the input signal
Period upper limit
Level
The period-trigger condition is satisfied when the upper
limit of periods elapses before a rising slope of an input
signal crosses the reference voltage level.
Thus, points at which the period-out-trigger condition is
satisfied varies depending on the upper limit of a period
range.