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H Fundamentals of Time Interval Measurements Application Note 200-3 Electronic Counter Series 1 2 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