Visual Accuracy Calculator

Fill Out the Form Below to Receive Your Accuracy Calculations

Fill in the specifications for your device and you will receive an accuracy calculation heat map in PDF form. If you have questions, please contact us at 614-777-1005.

Enter your device parameters

The entry boxes below allow the user to enter the device’s key error parameters as the manufacturer states them and calculate an error as a % of Full Scale. Some entry boxes may not apply to your type of device and the program “greys” these boxes out.

A few tips to save frustration

  • OSI typically includes linearity, electrical offset and/or hysteresis in the base accuracy specification. Other manufacturers follow different practices.
  • Enter all separately listed parameters in the space provided. If an accuracy parameter is not included on the manufacturer’s specification sheet, ask the manufacturer for the specific value.
  • As always, please contact our Tech Support Team by email, chat or phone if you have any questions. We’re at 1.614.777.1005 from 8am – 5pm Eastern.
  • When offered a “Maximum” value vs. a “Typical” value, use the “Maximum” value. That’s the specification. The other is an estimate.
  • Some specifications are quoted as “ppm per…”. It’s a simple conversion, e.g., 500ppm = 0.05 %. Those values can be directly inserted.
  • Some temperature specs employ multiple parameters that must be summed to determine total error. You may add the percentages.
  • Verify that Full Scale and Calibration point match
  • Hysteresis/Magnetic influence should state the Overload, typically as a multiple of Full Scale; however, we’ve seen at least one example where the influence occurs at Full Scale. It pays to read carefully.
  • An AC value specified “Avg. RMS” is typically the less complex Average – but it can only be one or the other.

Guide for Calculator Inputs

Measurement - Select Amps, Volts or Watts
Full Scale Input - Enter full scale value of measurement
Accuracy - Enter % of full scale accuracy. You may need to calculate full scale if accuracy is stated as % of reading.
Output - Select from industry standard typical outputs.
Linearity Offset (optional) - Enter linearity value if stated separately. Many OSI products include linearity in total accuracy.
Electrical Offset (optional) - Enter electrical offset value if stated separately. Many OSI products include electrical offset in total accuracy.
Hysteresis/Magnetic Offset (optional) - Enter hysteresis offset value if stated separately. Many OSI products include hysteresis offset in total accuracy.
Low Temperature - Enter low value temperate operating range. For low temperature range of zero, replace with "0.5".
High Temperature - Enter high value of temperature range.
Temperature Effect/Coefficient - Enter accuracy value of temperature per degree Celsius or Kelvin. If %/°C is not available, please contact factory for assistance.

Please chat with OSI sales representative for assistance with % of full scale temperature calculation.

Select Watts, Volts, or Amps from the dropdown menu.
Enter the minimum value you want to measure. Must be greater than zero.
Enter the full scale or max rated value of your device
Enter the product’s full-scale accuracy in %. If using % of reading, contact OSI Tech Support.
Select from Industry Standard outputs. Contact OSI Tech Support if you require a different output type
(Optional.) This factor measures error due to the conductor position within the device window. Enter specified value. When not stated, and position is critical (typically small conductor in a larger window), please ask the manufacture for a value. This field is only for current sensing devices and should be left blank when measuring watts or volts.
(Optional) This value captures how much the actual measurement curve departs from ideal. NOTE: Many OSI specifications already include linearity error in the base accuracy statement.
OR
This captures the difference between the output value and a reference. Commonly measured as a deviation from zero and typically stated in mA or mV. The program automatically inserts base value from the output selection.
OR
Measurement error resulting from change in direction and magnitude of input current or power. Only significant in DC applications. It’s important to note the magnitude of the change, as this impacts significance. Typically stated as 3X, 10 X or 20X rated, though it may reach 1000X. The program automatically inserts base value from the output selection.
Calculated total uncertainty as a % of full scale
OR
This captures the impact of temperature on measurement error is stated as either “mA or mV per °C or °K” or as a “ % per °C or °K” If the first then enter the specified value in the “Value” box. The program automatically inserts base value per the output selection. If a “ % per °C or °K” is given insert that value in the lower box.
OR
This captures the additional impact of temperature on gain (referred to as Temperature coefficient of G or Uout) and is commonly stated as either “mA or mV per °C or °K” or as a “% per °C or °K” If the first, then enter the specified value in the “Value” box. The program automatically inserts base value per the output selection. If a “ % per °C or °K” is given insert that value in the lower box.
This is a simple sum of the two temperature errors. No input is required.
Enter the low operating temperature in °C. This will determine the lower limit of the graph.
Enter the high operating temperature in °C. This will determine the upper limit of the graph.
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