FieldengInstrumentation & Controls
Instrument Zero / Span Error
Zero shift at LRV and span/gain error between measured and reference endpoints.
Instrumentation & Controls
Zero shift at LRV and span/gain error between measured and reference endpoints.
App id: INST-21. Reference version 1.0.
How to fill it
Fill the inputs. The tool shows the outputs.
On the tool screen, Calc is the working sheet. Presets stores values you reuse. Reference is the formula, assumptions, and provenance below.
Formula
zero = LRV_meas − LRV_ref; gain = (URV_meas − LRV_meas) / (URV_ref − LRV_ref)Inputs
| Name | Unit |
|---|---|
| LRV reference | psi |
| URV reference | psi |
| Measured LRV | psi |
| Measured URV | psi |
Outputs
| Name | Unit |
|---|---|
| Zero deviation (hero result) | psi |
| Span deviation | psi |
| Measured span | psi |
| Gain (measured/reference) | 1 |
Diagnose
Observations are context. They do not pass or fail a structure. See Diagnose.
| When | Observation | Severity |
|---|---|---|
|gain - 1| > 0.05 | Large calibration correction | caution |
Assumptions
- Reference URV ≠ LRV.
Provenance
- Field zero/span check. Gain of 1 is a perfect span match.