Measurement Time Weighting Lookup
Bounded offline reference: NominalF/Ssoundmeter timeweightingreference. Only explicit listed topics;not exhaustive/live data or diagnosis,safety/compliance/identity certificate.
Description
Sound-level meter time weighting smooths a changing squared-pressure signal over a nominal response time.
Sound-level meter time weighting smooths a changing squared-pressure signal over a nominal response time.1
This bounded reference describes FAST and SLOW exponential time constants and distinguishes them from frequency weighting or Leq integration.
When to use Measurement Time Weighting Lookup
Use this tool to apply the stated measurement time weighting lookup operation with an explicit input and unit basis.
How to use Measurement Time Weighting Lookup and how it works
- Establish the measurement basis and units described above.
- Enter topic and run the tool.
- Read result.text using the output meanings below.
- If input is rejected, correct the stated type, range, ordering or alignment issue and rerun; review successful results under the declared convention.
| Input field | Meaning | Value type | Requirement |
|---|---|---|---|
| topic | Topic. Units, ordering and applicable branch are specified in the algorithm. | string | required; further conditions in the algorithm |
Require an exact topic fast, slow or scope. Return the stored explanation: nominal FAST is 125 ms and SLOW is 1 s; unknown topics are rejected and no instrument compliance is assessed.
text = stored response for exact topic fast, slow or scope Apply the declared units, ordering and branch conditions.
| Exact topic token | Stored response |
|---|---|
| fast | Nominal exponential sound-level FAST time constant125ms. |
| slow | Nominal exponential sound-level SLOW time constant1s. |
| scope | Timeweighting is not frequencyweighting,Leqintegrationduration or a guaranteeofinstrumentcompliance. |
| Output field | Meaning | Value type |
|---|---|---|
| result | Object containing the declared output fields. | object |
| result.text | Stored response for the exact topic token. | string |
{
"input": {
"topic": "fast"
},
"output": {
"result": {
"text": "Nominal exponential sound-level FAST time constant125ms."
}
}
}Limitations and assumptions
The output applies the declared operation to the values you supply. Establish the measurement basis, units, coefficients and any caller-selected rules before interpreting it. The tool does not independently collect or verify observations or decide whether a model or reference applies.
Supply explicit required fields with the documented types and dense aligned arrays. Unknown fields, wrong types and nonfinite numbers are rejected. Branch-specific constraints are explained above. A returned boolean, signed difference or tied result follows the stated convention; an input error instead means the required input contract was not satisfied. Very large inputs or outputs may be rejected by shared resource limits.
Alternative or Complementary methods
For a related operation, use A-Weighting Correction Lookup. A weighting applies a nominal frequency-dependent correction commonly used in sound-level reporting.
For a related operation, use C-Weighting Correction Lookup. C weighting describes a nominal frequency-dependent adjustment to sound levels.
References
-
Measurement Time Weighting Lookup — tool.io
Similar or alternative tools
- A-Weighting Correction Lookup
A weighting applies a nominal frequency-dependent correction commonly used in sound-level reporting.
- C-Weighting Correction Lookup
C weighting describes a nominal frequency-dependent adjustment to sound levels.