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5-9
MEASUREMENT TIME
There are four basic functions for which measurement time can be calculated:
frequency/period, time interval, ratio and phase.
The equations to determine the actual measurement time for the four functions are as follows:
Frequency/Period:
Frequency/period measurement times are equivalent to the actual gate time. The actual gate
time always exceeds the programmed gate time by up to 2 periods of the input signal. Thus,
the total measurement time is the sum of the programmed gate time and up to two periods
of the measurement signal. (See discussion of gate time following this application note).
Meas. Time = Programmed Gate Time + < 2 Periods of a Signal
Time Interval (includes rise/fall time and pulse width):
The time interval measurement time is equivalent to the actual time interval to be measured.
Thus, some idea of the time interval should be known in order to calculate the measurement
time.
Meas. Time = 1 nS to 8x10 S (Signal Dependent)
7
Ratio:
Ratio measurement time is equivalent to the actual gate time. The actual gate time always
exceeds the programmed gate time by up to 2 periods of the slower input signal. Thus, the
total measurement time is the sum of the programmed gate time and up to two periods of the
measurement signal. (See discussion of gate time following this application note).
Meas. Time = Programmed Gate Time + < 2 Periods of Slower Signal
Phase:
A ratio measurement, a period measurement, and a time interval measurement are performed
by the counter in order to produce a phase measurement value. Thus, the phase
measurement time is equivalent to the summation of three measurement times.
Meas. Time = Ratio Meas. Time + Period Meas. Time + Time Interval Meas. Time
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