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Model 5328A
Theory of Operation
Figure 4-5, Synchronizer Operation with Time Interval Averaging
4-33. There are occasional situations where time interval averaging cannot be performed on
a periodic signal. This problem occurs when the input time interval repetition rate is synchro-
nous with the internal clock.
4-34. SOURCES OF MEASUREMENT ERROR
4-35. The major sources of measurement error are the ±1 count ambiguity, the time base error
and trigger error. These are discussed in the following paragraphs.
4-36. ±1 Count Ambiguity
4-37. Since the signal input to the main gate of the counter and the clock input are not coherent,
an inherent ±1 count ambiguity exists in the count accumulated in the decade counting assem-
blies. This is illustrated by Figure 4-6.
Figure 4-6. ±1 Count Ambiguity
NOTE
The main gate is open for the same time, t
m
, in both cases. incoher-
ence between the clock and the input signal can result in two different
counts which for this example is one for case A and two for case B.
4-5