Optimizing Strain Gage Excitation Levels A calculator for Attenuation Factor For correcting indicated strain when an inactive resistor is used to reduce bridge voltage & power-density over the grid area.

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Independent Variables Inactive Resistor (ohms), Gage Resistance (ohms), Dependent Variable Attenuation Factor (dimensionless),

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Calculator

Inactive Resistor:

Gage Resistance:

Attenuation Factor:

"9"){ return false } } return true } function DontChange(){ CalculateValue() } // rounds inputVal to specified decimal places function RoundValue(inputVal, decPlaces){ //...add (or subtract) just enough of the value to handle the truncation later... inputVal = parseFloat(inputVal) if (inputVal >= 0){ inputVal = inputVal + (5 * Math.pow(10, -(decPlaces+1))) } else{ inputVal = inputVal - (5 * Math.pow(10, -(decPlaces+1))) } inputStr = "" + inputVal outputStr = "" isDecimal = false exponentFound = false for (var i = 0; i < inputStr.length; i++){ var oneChar = inputStr.charAt(i) //... if a decimal has been already found, decrement the counter if (isDecimal) --decPlaces; // ...if decimal point located, set flag, and exit with value if no decimal places are needed if (oneChar == '.'){ isDecimal = true if (decPlaces == 0){ continue } } // ...add the character if necessary if ((oneChar == 'E') || (oneChar == 'e') || (oneChar == 'D') || (oneChar == 'd')) { exponentFound = true } // ...Add character if necessary if (exponentFound || decPlaces >= 0) { outputStr = outputStr + oneChar } } return outputStr } // End Script -->

Related Calculator A for calculating the value of the inactive resistor.