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Time Interval Analyzer 7 Analog Modules

System Reference, January 2001

227

• Period/Frequency Measurement

This mode is used to measure the period or frequency of a

periodic signal.

Figure102

TrigDelayCnt

Parameters for Period/Frequency Measure-

ment

For PER or FREQ, after the trigger is detected, the TIA

counts the rising edges of the signal to start and stop the

measurement using

TrigDelayCntStart

and

TrigDe-

layCntStop

. In this case, the TIA first measures the

interval from the edge determined by

TrigDelayCnt-

Start

to the edge determined by

TrigDelayCntStop

then divides the interval by the number of cycles to get an

averaged period/frequency. In the above example, the

interval to be measured includes 4 (5-1) cycles of the

clock. Therefore, to get an averaged period, the measured

interval is divided by 4.

NOTE By default, 1 is set to both

TrigDelayCntStart

and

TrigDelayCntStop

. To specify one cycle of a waveform

to be measured,

TrigDelayCntStop

must be greater

than

TrigDelayCntStart

Trigger

Signal

1 2345TrigDelayCntStart(1) TrigDelayCntStop(5)6

The TIA measures this interval, then divides the measured

interval by 4 (5-1) to get averaged period/frequency.

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