Description
For nonnegative shiftMinutes, breakMinutes, and unobservedMinutes with break+unobserved<=shift return observedMinutes=shift-break-unobserved.
Occupational exposure calculations combine measured quantities, duration, reference conditions, weighting, and sampling support. Linear concentrations, squared acceleration, and logarithmic sound levels require different arithmetic. A supplied reference or limit is not automatically the applicable standard, and a local calculation is separate from a full exposure and safety assessment.
For nonnegative shiftMinutes, breakMinutes, and unobservedMinutes with break+unobserved<=shift return observedMinutes=shift-break-unobserved.
When to use this tool
Use Shift Break Unobserved Base Token when you need this particular sampling, duration, reference-unit, physical-exposure, or reporting-base term.
How to use the tool and how it works
- Enter shiftMinutes, breakMinutes, unobservedMinutes, excludeBreaks. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read denominatorMinutes, observedMinutes, observedFraction, defined. Inspect defined before interpreting the associated values.
For nonnegative shiftMinutes, breakMinutes, and unobservedMinutes with break+unobserved<=shift return observedMinutes=shift-break-unobserved. Choose denominatorMinutes=shift-break if excludeBreaks, otherwise shift, and return observedFraction when positive or zero with defined=false.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| shiftMinutes | Shift Minutes | Required. Finite number; minimum 0. |
| breakMinutes | Break Minutes | Required. Finite number; minimum 0. |
| unobservedMinutes | Unobserved Minutes | Required. Finite number; minimum 0. |
| excludeBreaks | Exclude Breaks | Required. Boolean. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| denominatorMinutes | Denominator Minutes | Required. Finite number. |
| observedMinutes | Observed Minutes | Required. Finite number. |
| observedFraction | Observed Fraction | Required. Finite number. |
| defined | Whether the stated denominator or quantity is defined; inspect before using a placeholder. | Required. Boolean. |
{
"input": {
"shiftMinutes": 480,
"breakMinutes": 60,
"unobservedMinutes": 20,
"excludeBreaks": true
},
"output": {
"denominatorMinutes": 420,
"observedMinutes": 400,
"observedFraction": 0.9523809523809523,
"defined": true
}
}Limitations and assumptions
- The numerator always excludes breaks and unobserved minutes. Categories and records are supplied, so coverage is not a measure of actual hazard exposure, recovery, or compliance with work-rest requirements.
- Inputs must satisfy both the field types and the cross-field conditions above. Invalid input causes an error; a successful false flag or documented placeholder is a different result.
- Numeric calculations use binary floating point unless exact decimal-integer arithmetic is explicitly stated. No hidden measurement tolerance or decimal rounding is added; nonfinite or out-of-contract results are rejected. Numeric signed-zero results are exported as zero.
Alternative or Complementary methods
Use a complete hazard-specific assessment with calibrated measurements and the appropriate exposure model. Verify reference conditions, sampling coverage, weighting, denominator, and the applicable professional or regulatory method.
References
Similar or alternative tools
- Shift Break Window Gap
Return duration=breakEnd-breakStart and gap=duration-requiredDuration.
- Occupational Sample Break Time Exclusion
Return excludedMinutes, sampledMinutes=shift-excluded, and sampleShare=sampled/shift.