Trigger Mode Setup And Operation - Extech Instruments 407790A User Manual

3.7 Trigger Mode Setup and Operation

A measurement can be initiated by one of three triggers: time trigger (time-controlled
triggering), level trigger (sound level controlled triggering), and external trigger (triggering by an
external signal).
Level trigger 1: Measurement starts when the trigger level is exceeded and ends after the
measurement time.
The trigger level is valid at any time.
Setting items:
Trigger Slope Type: +, -
Trigger Level: 25 to 130dB, 1-dB steps.
Trigger Band: MAIN AP/31.5Hz/63Hz/125Hz....8kHz (1/3 octave bands)
Level trigger 2: Single measurement is made when trigger level is exceeded.
The trigger level is valid at any time.
Setting items:
Trigger Level: 25 to 130dB, 1-dB steps.
Trigger Band: MAIN AP/31.5Hz/63Hz/125Hz...8kHz (1/3 octave bands).
Time trigger: This is a reoccurring trigger timer that starts a measurement after a trigger timer.
The measurement ends after the measurement time.
The trigger timer is valid at all times.
Setting items:
Trigger Time: h:m:s
External trigger: A Measurement starts at falling edge of a logic-level (0 to 5V logic) signal at the
external trigger input. A Pulse width of 1ms or more is required.
.
The external trigger is valid at all times
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