Potentiometer Position Accuracy Calculator

Posted by Robbie Dickson on

Potentiometer Position Accuracy Calculator

Estimate potentiometer feedback quantization, linearity error, worst-case error, and RSS position error from stroke, ADC counts, linearity, and repeatability. The result is a preliminary engineering estimate, not a product rating or safety approval.

Calculate pot position error

Enter the measured or assumed inputs in one unit system. The calculator converts to SI internally, evaluates the stated model, and displays the result in the selected unit system.

mm
Enter measured stroke for the modeled condition.
1
Enter usable adc counts for the modeled condition.
percent
Enter linearity error for the modeled condition.
mm
Enter repeatability error for the modeled condition.
Position quantization step --
Linearity position error --
Worst-case position error --
RSS position error estimate --
Enter values inside the documented model domain.

Engineering visualizer

Potentiometer Position Accuracy Calculator visualizer Schematic, not to scale. The drawing updates from the production calculation engine and labels the main outputs.

Schematic, not to scale. The drawing updates from the production calculation engine and labels the main outputs.

Calculator by FIRGELLI Automations.

Embed this calculator

The responsive iframe opens the calculator-only view without Shopify navigation or footer. FIRGELLI attribution, the visualizer, and calculation-error reporting remain available.

What This Calculator Calculates

What does potentiometer position accuracy mean? This quantity describes one specific part of the actuator design problem. It should be read as a model output, not as a complete product selection rule.

How To Interpret The Results

How should I interpret the potentiometer position accuracy result? A larger result means the checked effect is becoming more important and should be compared with product data, mounting limits, or the next design check. A smaller result does not prove the whole system is safe.

When Not To Use This Calculator

When should I not use the potentiometer position accuracy model? Do not use this model when the inputs are unknown, the mechanism is outside the stated boundary, or the decision depends on manufacturer ratings, fatigue, shock, compliance, or regulated safety approval.

Engineering model and calculation details

Estimate potentiometer feedback quantization, linearity error, worst-case error, and RSS position error from stroke, ADC counts, linearity, and repeatability.

The page separates the calculator result from product selection. It explains the inputs, limitations, interpretation, and next design checks so the result is not mistaken for a complete actuator rating.

Governing equations

Quantity Equation Model meaning
Position quantization step q = stroke/counts Calculates position quantization step for the stated simplified model.
Linearity position error e_l = stroke pct Calculates linearity position error for the stated simplified model.
Worst-case position error E_wc = q + e_l + r Calculates worst-case position error for the stated simplified model.
RSS position error estimate E_rss = sqrt(q^2+e_l^2+r^2) Calculates rss position error estimate for the stated simplified model.

Variables and canonical units

Symbol Variable SI unit Domain
stroke Measured stroke m finite engineering value in the documented model domain
adc_counts Usable ADC counts 1 finite engineering value in the documented model domain
linearity_error Linearity error 1 finite engineering value in the documented model domain
repeatability Repeatability error m finite engineering value in the documented model domain
quantization_step Position quantization step m finite result from valid inputs
linearity_position_error Linearity position error m finite result from valid inputs
worst_case_error Worst-case position error m finite result from valid inputs
rss_error RSS position error estimate m finite result from valid inputs

Assumptions and boundary conditions

  • Inputs represent one consistent operating condition.
  • The model uses the simplified boundary stated on the page.
  • The model begins and ends at the user-defined actuator or mechanism boundary.

Limitations and omitted checks

  • The result depends on user-entered values and simplified boundary conditions.
  • The model does not replace FIRGELLI product data, installation review, endurance testing, or a qualified engineering review.
  • Shock, fatigue, misalignment, mounting strength, and controller behavior may govern before the calculated value.

Worked example

Stroke 150 mm, 1023 usable ADC counts, linearity 1%, repeatability 0.30 mm. q = 0.147 mm, e_l = 1.50 mm, E_wc = 1.95 mm, E_rss = 1.54 mm. Linearity dominates.

Related checks: Hall-sensor position resolution calculator, backlash and position error budget, Heavy Duty actuators.

What this model evaluates

Mode or effect Status Disclosure
calculated quantity evaluated The named output is evaluated for the stated model.
manufacturer rating not evaluated The result is not a manufacturer product rating.
installation detail not evaluated Mounting, alignment, shock, fatigue, and environment require separate review.

Common mistakes

  • Treating a simplified estimate as a manufacturer rating.
  • Mixing units or entering values measured at a different operating point.
  • Ignoring mounting, alignment, shock, duty cycle, or controller limitations.
  • Failing to compare the result with the next logical FIRGELLI design check.

Engineering references

  1. Barry N. Taylor and Chris E. Kuyatt. Guidelines for Evaluating and Expressing the Uncertainty of NIST Measurement Results. National Institute of Standards and Technology, NIST Technical Note 1297. Supports: Root-sum-square treatment of independent standard uncertainty components.. Accessed 2026-07-28. Source.
  2. National Institute of Standards and Technology. NIST Guide to the SI. National Institute of Standards and Technology, Accessed 2026. Supports: SI unit definitions and unit-consistent engineering calculation display.. Accessed 2026-07-28. Source.

Author, validation, and review status

Author: Robbie Dickson

Author profile: Robbie Dickson prepares FIRGELLI actuator education and calculator content for product users and engineering teams.

Engineering model type: Potentiometer feedback resolution and accuracy estimate

Validation: The production JavaScript engine is compared with a separately written Python oracle across known-answer, SI/imperial-equivalent, boundary, invalid-input, and randomized cases.

Questions about this calculator or found an error? Message our engineering team.

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