Use this electronics calculation for a first-pass component, converter, signal, motor, or sensor estimate when the stated operating conditions and units match the device data.

First Closure Milliseconds (ms)

Required number input.

Last Transition Milliseconds (ms)

Required number input.

Observed relay contact-bounce duration from first closure to last stable transition. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Bounce Milliseconds (ms)

The resulting bounce milliseconds returned as a number.

• Relay timing, coil power, inductance, and bounce depend on coil voltage, temperature, driver, suppression network, mechanical load, contact material, current, and aging. Contact ratings differ for AC, DC, resistive, inductive, and inrush loads.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Check the result against the current datasheet and worst-case operating corners, then verify the circuit or measurement with simulation and bench testing where failure matters.

• Contactor Operate Time

  Observed contactor operate delay from coil energization to completed contact closure.

• Audio Limiter Attack Time

  First-order limiter envelope attack time constant from observed 10% and 90% response-crossing times.

• Relay Coil Inductance

  Calculate relay-coil inductance from measured coil resistance and RL electrical time constant using L=Rτ; contact mechanics are not included.