Description
Return corrected = signal-blank and nominalMargin = corrected-suppliedLimit, with lowerMargin = nominalMargin-uncertainty and upperMargin = nominalMargin+uncertainty.
Environmental measurements can require background subtraction, recovery correction, calibration or a common reference basis. Corrected values can be signed; a numerical correction is separate from detection, analytical validity and health interpretation.
Return corrected = signal-blank and nominalMargin = corrected-suppliedLimit, with lowerMargin = nominalMargin-uncertainty and upperMargin = nominalMargin+uncertainty.
When to use this tool
Use Ambient Blank Detection Limit Gap when checking a supplied measurement correction, comparison or calibration term.
How to use the tool and how it works
- Enter signal, blank, suppliedLimit, uncertainty. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read corrected, nominalMargin, lowerMargin, upperMargin. Use the output convention below.
Require nonnegative uncertainty. Return corrected = signal-blank and nominalMargin = corrected-suppliedLimit, with lowerMargin = nominalMargin-uncertainty and upperMargin = nominalMargin+uncertainty. All values share the same signal or concentration unit.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| signal | Signal | Required. Finite number. |
| blank | Blank | Required. Finite number. |
| suppliedLimit | Supplied Limit | Required. Finite number. |
| uncertainty | Uncertainty | Required. Finite number; minimum 0. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| corrected | Corrected | Required. Finite number. |
| nominalMargin | Nominal Margin | Required. Finite number. |
| lowerMargin | Lower Margin | Required. Finite number. |
| upperMargin | Upper Margin | Required. Finite number. |
{
"input": {
"signal": 12,
"blank": 2,
"suppliedLimit": 8,
"uncertainty": 1
},
"output": {
"corrected": 10,
"nominalMargin": 2,
"lowerMargin": 1,
"upperMargin": 3
}
}Limitations and assumptions
- The uncertainty is a supplied symmetric half-width applied after subtraction, not a propagated uncertainty or confidence level. Negative corrected signals remain valid arithmetic outputs; a positive margin is not independently a detection or compliance finding.
- 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 the relevant analytical method, quality-control records and uncertainty model before classifying a corrected measurement.
References
Similar or alternative tools
- Environmental Limit Qualifier Sign
Accept qualifier only as exact, less-than or greater-than.
- Radon Background Reference Gap
Return corrected = (measured-background)*suppliedScale and referenceGap = corrected-reference.