Description
Return correctedSignal = sampleSignal-blankSignal.
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 correctedSignal = sampleSignal-blankSignal.
When to use this tool
Use Drinking Water Sampler Blank Share when checking a supplied measurement correction, comparison or calibration term.
How to use the tool and how it works
- Enter sampleSignal, blankSignal. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read blankFraction, correctedSignal, fractionDefined. Inspect fractionDefined before interpreting the associated values.
Return correctedSignal = sampleSignal-blankSignal. If sampleSignal !== 0, return blankFraction = blankSignal/sampleSignal and fractionDefined = true; otherwise return blankFraction = 0 and fractionDefined = false. Both signals share a common unit and calibration basis.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| sampleSignal | Sample Signal | Required. Finite number. |
| blankSignal | Blank Signal | Required. Finite number. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| blankFraction | Blank Fraction | Required. Finite number. |
| correctedSignal | Corrected Signal | Required. Finite number. |
| fractionDefined | Whether sampleSignal is nonzero, so the blank fraction is defined. | Required. Boolean. |
{
"input": {
"sampleSignal": 10,
"blankSignal": 2
},
"output": {
"blankFraction": 0.2,
"correctedSignal": 8,
"fractionDefined": true
}
}Limitations and assumptions
- Signals may be signed and the blank fraction may be negative or exceed one. The zero-denominator placeholder is not an actual blank contribution, and no detection or compliance decision is performed.
- 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 Blank Qualification Gap
Return gap = sampleSignal-blankSignal*suppliedMultiplier and aboveBoundary = sampleSignal > blankSignal*suppliedMultiplier.
- Air Sample Duration Share Tool
Calculate air sample duration share from explicit caller-supplied inputs.