Description
commonMode = (left+right)/2; differential = left-right; centeredCommonMode = commonMode-reference.
A resistive bridge relates two divider outputs to differential and common-mode voltages. Numerical balance depends on arm ratios, while practical balance, sensitivity and readout limits also depend on loading and calibration.
commonMode = (left+right)/2; differential = left-right; centeredCommonMode = commonMode-reference.
When to use this tool
Use Bridge Sensor Common Mode Reference when checking a supplied ideal bridge or common-mode quantity.
How to use the tool and how it works
- Enter left, right, reference. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read differential, commonMode, centeredCommonMode. Use the output convention below.
commonMode = (left+right)/2; differential = left-right; centeredCommonMode = commonMode-reference.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| left | Left | Required. Finite number. |
| right | Right | Required. Finite number. |
| reference | Reference | Required. Finite number. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| differential | Differential | Required. Finite number. |
| commonMode | Common Mode | Required. Finite number. |
| centeredCommonMode | Centered Common Mode | Required. Finite number. |
{
"input": {
"left": 5,
"right": 3,
"reference": 1
},
"output": {
"differential": 2,
"commonMode": 4,
"centeredCommonMode": 3
}
}Limitations and assumptions
- All inputs share a voltage unit and reference. This is a supplied-node comparison, not an amplifier model, common-mode rejection assessment or proof of acceptable input range.
- 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 full bridge, sensor and amplifier model for calibration, tolerances, common-mode range and measurement uncertainty.
References
Similar or alternative tools
- Bridge Arm Ratio Balance Residual
outputVoltage = supply*(bottomLeft/(topLeft+bottomLeft)-bottomRight/(topRight+bottomRight)); balanced checks exact topLeft*bottomRight === topRight*bottomLeft.
- Electricity: Transformer Turns Polarity Sign Tool
Apply an ideal transformer turns ratio with an explicit common/opposed dotted voltage-reference orientation; not a winding safety or saturation model.