ETI SYSTEMS CUTS POSITION FEEDBACK ERRORS WITH NEW POTENTIOMETER CALIBRATION STANDARD
Author : Emma Harper | Published On : 14 Aug 2026
Carlsbad, CA. Position feedback errors remain one of the more persistent and often overlooked sources of inaccuracy in industrial control systems. Even when an actuator and controller are functioning correctly, small calibration inconsistencies in the sensing element can introduce errors that compound over time, showing up as inconsistent stop positions, uneven response across a system's travel range, or setpoints that drift slightly from one cycle to the next. These errors rarely trace back to a single failed part. More often, they trace back to how the sensing device was calibrated in the first place.
ETI Systems is addressing this issue directly with a new calibration standard for its Potentiometer product line, designed to tighten output consistency across the full range of motion and reduce the small, cumulative errors that degrade positioning accuracy over an equipment's operating life. The standard applies stricter reference-point verification during production, giving engineers a more reliable baseline to scale their control systems around from the moment a unit is installed.
Reduce Cumulative Error With Tighter Potentiometer Reference-Point Verification
Position feedback errors often originate at a handful of specific reference points along a component's travel: the starting position, the midpoint, and the upper limit of range. If any one of these reference points is calibrated with even a small deviation, that error propagates across every position calculation the controller makes downstream, since the entire scaling relationship depends on those anchor points being accurate.
ETI Systems' updated calibration standard tightens the acceptable deviation at each of these reference points during final testing, rather than relying solely on a single end-to-end resistance check. Every Potentiometer built under the new standard is verified at multiple points across its travel, not just at the two end terminals, which catches inconsistencies that a simple total-resistance measurement would miss entirely. For engineers building closed-loop control systems, that extra verification step translates directly into tighter positioning accuracy without requiring any additional calibration work on the customer's end.
Why Small Calibration Errors Compound Into Larger Control Problems
A calibration error that looks negligible on a single unit's datasheet can still cause real problems once that unit is integrated into a working control loop. Controllers scale their output based on the feedback device's specified range, and if the actual calibration deviates from that specification, every position command calculated against it inherits a proportional error.
This is where the distinction between a Potentiometer and a general-purpose Variable Resistor becomes practically important. A potentiometer used strictly for basic adjustment, where a small output shift is tolerable, doesn't need the same calibration precision as one feeding a closed-loop position control system, where the controller trusts that a specific voltage always corresponds to a specific physical position. In precision applications, even a calibration deviation well under one percent can accumulate into a noticeable positioning error after enough repeated cycles, particularly in systems where the actuator sees frequent starts, stops, and direction changes.
Calibration Practices That Reduce Long-Term Feedback Drift
- Multi-Point Reference Verification: Confirm output accuracy at the start, midpoint, and end of travel, not just total resistance.
- Matched Electrical and Mechanical Range: Align the sensing element's electrical output precisely with its actual mechanical travel.
- Consistent Reference Voltage During Testing: Calibrate under the same supply conditions the unit will see in the field.
- Documented Baseline Values: Record calibration data at the factory level so field technicians have a verified reference point.
- Element-Appropriate Tolerance Standards: Apply tighter tolerances for precision feedback applications than for general-purpose Variable Resistor uses.
- Post-Calibration Verification Testing: Re-test units after calibration to confirm values hold under normal operating conditions.
How Calibration Drift Develops Over an Equipment's Operating Life
Calibration errors rarely announce themselves immediately. A unit that passes final testing within acceptable tolerance can still show a small measurable deviation months into service, as mechanical wear, thermal cycling, and repeated use gradually shift how the resistive element responds. The earliest signs typically show up in repeatability testing rather than everyday operation: a commanded position lands correctly once, then misses by a small margin on a later cycle.
Because the sensing element still produces a valid signal throughout this process, the control system usually continues operating without triggering an obvious fault. That's precisely what makes calibration-related drift difficult to catch through casual inspection. It takes a documented baseline, established at the point of manufacture, to give a maintenance team something concrete to compare current readings against months or years later.
Service Checks That Confirm Potentiometer Accuracy Without Full Recalibration
ETI Systems recommends that customers verify feedback accuracy against factory baseline values at scheduled service intervals, rather than waiting for a visible control problem to prompt an inspection. Checking output at the same reference points used during original calibration, start, midpoint, and full travel, gives technicians a fast way to confirm whether a Potentiometer is still performing within its original specification.
If measured values fall outside the documented baseline, the next step is isolating the cause before adjusting controller settings. Mechanical alignment, mounting integrity, and environmental exposure should all be reviewed first, since correcting the actual source of drift protects the original control strategy and avoids masking a mechanical issue with a software-side recalibration that only treats the symptom.
ETI Systems' Commitment to Calibration Precision Across Its Product Line
ETI Systems designed this new calibration standard around a straightforward goal: giving engineers a feedback device they can trust to behave exactly as specified, from first installation through years of continuous operation. Precision position sensing depends on more than component quality alone. It depends on verified, documented calibration that holds consistently across every unit that ships.
By applying multi-point verification standards across its Potentiometer line and distinguishing calibration requirements between precision feedback applications and general-purpose Variable Resistor use, ETI Systems is giving control engineers a more reliable foundation to build accurate, repeatable systems on, without adding complexity to integration or commissioning.
Contact
- Business Name: ETI Systems
- Business Address: 1954 Kellogg Avenue, Carlsbad, CA 92008
- Email: [email protected]
- Tel: (760) 929-0749
