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H
Fundamentals of Time Interval
Measurements
Application Note 200-3
Electronic Counter Series
1
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Table of Contents
Precision Time Interval Measurement
Using an Electronic Counter ..................................................... 5
Preface ........................................................................................................... 5
Time Interval Measurement Using an Electronic Counter ........ 6
Introduction .................................................................................................. 6
What can be Measured ................................................................................ 6
How Measurement is Made ......................................................................... 7
Resolution ...................................................................................... 8
One-Shot Measurements ............................................................................. 8
TI Averaging .................................................................................................. 8
Minimal Interval, Dead Time and Pulse Width ......................................... 9
Start and Stop Signal Input Channels ....................................... 10
General ........................................................................................................ 10
Desirable Characteristics .......................................................................... 10
Controls Associated with Time Interval Measurements ....................... 11
Input Circuit Operation as it Affects the User ........................................ 11
Input Signal Conditioning Controls and
Trigger Circuit Operation ........................................................ 13
Signal Conditioning Controls Set the Trigger Point............................... 13
Other Input Controls .................................................................................. 13
Trigger Operation ....................................................................................... 16
Determining the Hysteresis Window and Triggering at Zero Volts ..... 24
Hysteresis Compensation.......................................................................... 27
Polarity Control .......................................................................................... 29
Input Attenuators for Measuring Higher Amplitude Signals ................ 30
Trigger Lights .............................................................................................. 30
Markers ........................................................................................................ 31
Delay ! Control ......................................................................................... 34
Time Interval Averaging ............................................................. 36
Reduce +1 or