
7 Analog Modules Time Interval Analyzer
230 System Reference, January 2001
• Auto Trigger mode
This mode uses the edge of the input signal to channel
1 or 2 as the trigger, as follows:
– ARM on Start:
The TIA starts the interval measurements from the
next pulse after the specified edge of the channel 1
input signal is detected as a trigger.
For the dual channel measurement, the TIA
measures the interval from the specified edge on
channel 1 to the specified edge on channel 2.
However, if the TIA detects the edge on channel 2
before the edge on channel 1, the measurement data
is a negative value.
This function is available for PW/PER/FREQ
measurements on channel 1 and PD measurements.
– ARM on Stop:
The TIA starts the interval measurements from the
next pulse after the specified edge of the channel 2
input signal is detected as a trigger.
For the dual channel measurement, the TIA
measures the interval from the specified edge on
channel 1 to the specified edge on channel 2.
However, if the TIA detects the edge on channel 2
before the edge detection on channel 1, the
measurement data is a negative value.
This function is available for PD measurements.
– ARM Start First:
The TIA starts the interval measurements from the
next pulse after the specified edge of the channel 1
input signal is detected as a trigger. This mode
requires a minimum 1 ns setup time.
For the dual channel measurement, the TIA
measures the interval from the specified edge on
channel 1 to the specified edge on channel 2. Even if
there are some edges on channel 2 before the edge
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