User Manual

3-9

Setup

Additional Start Trigger Parameters

The following are the parameters that need to be configured for the Count Down, CH1,

SONIC, and Microphone start triggers when Normal, Real-Time, or Fast is selected as the

mode.

• If you specify CH1, SONIC, or Microphone for the [Start Trigger] parameter, you should

also use the [Trigger] tab of the Setup dialog box to specify an appropriate start trigger for

the selected sensor. Failure to specify an appropriate start trigger for the selected sensor

will cause an error to occur.

Count Down Start Trigger

Additional Parameter Initial Default Range

Timer 5 sec 1 to 10 sec

Timer: With this start trigger, performing the sampling operation starts a countdown*, and

actual sampling begins when the end of the countdown is reached. The countdown

start value can be specified in the range of 1 to 10 seconds.

* While a countdown is in progress, a countdown tone sounds from the Data Logger

and a Count Down dialog box remains on the ClassPad display. If you cancel the

countdown while this dialog box is displayed, the countdown tone will continue to

sound until the end of the preset Timer time is reached.

CH1 Start Trigger

Additional Parameter Initial Default Range

Sensor — —

Trigger Threshold Depends on connected sensor Depends on connected sensor

Trigger Edge Rising Rising, Falling

Sensor: This parameter shows the sensor that is currently connected to the CH1

channel. This parameter cannot be changed manually. Sampling is

triggered in accordance with the input value of the sensor connected to

the CH1 channel. The timing of the trigger is controlled in accordance

with the following two parameters.

Trigger Threshold: Specify a threshold value to specify when sampling is triggered.

Trigger Edge: Select either [Rising] (reaching the [Trigger Threshold] value from a value

less than it) or [Falling] (reaching the [Trigger Threshold] value from a

value greater than it) for this parameter.

Tip

• With this start trigger, executing a sampling operation initially enters the standby state, and

sampling does not start until sampled values cross the threshold in the specified direction (rising

or falling). When [Rising] is specified for [Trigger Edge], for example, sampling will not start if the

input value is already greater than the specified threshold value when the sampling operation is

executed. This is because the threshold has not been crossed after execution of the sampling

operation.

• When specifying the Trigger Threshold, be sure to specify a value that represents a relatively

significant change for the current or normally measured value. A threshold value that is too close

to the current or normally measured value can cause problems with triggering.