REV 1 DIGITMR S2 PC USER’S MANUAL
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3.0 GLOSSARY OF TERMS
Breaker Bounce-Back Distance
Bounce-back is the distance the breaker contact moves before the resting position after the
over-travel. Bounce-back is typically found in the close operation.
Breaker Over-Travel Distance
Over-travel is the distance the contact moves beyond the resting position. Over-travel is
typically found in the close operation.
Breaker Stroke
Circuit breaker contact stroke is the absolute distance measured from the open position to the
close position, excluding the over-travel and bounce-back distance. The DigiTMR S2 PC uses a
digital transducer to measure a breaker's contact stroke, over-travel and bounce-back. The
digital transducer outputs 200 counts per linear inch of travel, therefore the resolution is
accurate to about 1/200 inch. The output resolution is ±0.01 inch on the test result report.
Unlike resistor-type transducers, the DigiTMR S2 PC’s transducer needs no calibration or setup.
A user verifies the transducer’s functionality by selecting a diagnostic test for the transducer.
Breaker Velocity (Speed)
The DigiTMR S2 PC, when used with a travel transducer, calculates the breaker contact velocity
through the arc zone. Users need to program the calculation points or analysis points on the
travel curve for the unit to calculate the contact velocity. Velocity calculation points are shown
as Point 1 and Point 2 under the “Speed Analysis” section of the tabulated report.
Contact Wipe
Contact wipe is the distance measured from the close position to the contacts touching or
parting positions. In the close operation, contact wipe is measured from the contacts touching
position to the final close position. In the open operation, the contact wipe is measured from
the close position to the contact break or parting position.
NOTE
Contact wipe is measured during an operation. The measurement may not be as
accurate as the measurement done using the Slow-Close Mode. It is recommended
that the Slow-Close Test be used to verify the contact wipe measurement.
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