Advanced Telemetry Systems, Inc. R4500S Reference User Manual R05-11-A
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15.0 Setting Stationary Scan Time
The minimum stationary Scan Time should be set to allow for at least 5 pulses from the transmitter with the longest
pulse repetition period to be detected.
Once a valid signal has been detected during a Time Out period, the Time Out time is overridden by the Scan
Time. The Scan Time is the length of time to attempt to detect a valid pulse rate. The R4500S uses a pattern
matching algorithm to verify a pulse rate. The pattern matching algorithm uses 4 valid consecutive pulses and the
entered pulse rate information to verify a pulse rate. A setting for 5 consecutive pulses is needed because the first
pulse is not used. The Scan Time should be greater than the minimum setting to help allow for filtering out false
detections. Noise can trigger a false pulse rate. With a longer Scan Time, the number of detected pulses for a
transmitter located in the area will be greater, and separating a valid pulse rate stored to memory from a noise
generated pulse rate stored to memory will be easier.