WX118

WX118 High-Precision Medium-Power Wire-Wound Potentiometer

Product Overview

The WX118 is a wire-wound potentiometer specially designed for high-precision, medium-power applications. Its resistive element is precisely wound from constantan wire or nickel-chromium alloy wire onto an insulating frame. With outstanding performance parameters, this potentiometer has become a core component in precision instruments, military equipment, and other fields. It boasts strong stability, extremely low noise, resistance to high voltage and large current, precise resistance values, and excellent high-temperature tolerance, meeting the demanding requirements of accurate resistance adjustment under harsh operating conditions.

Operating Principle

The WX118 wire-wound potentiometer employs a brush-contact design, with the brush sliding and making intermittent contact across the exposed metal winding surface. Since each turn of alloy wire represents a discrete resistance step, its resistance changes in small, stepped increments, imposing certain resolution limitations. Although this winding structure slightly restricts the continuity of resistance adjustment, it delivers exceptionally high resistance accuracy and stability, fully satisfying the stringent need for precise resistance control in high-precision devices.

Key Performance Parameters

1. Rated Power: 1W–25W or higher
2. Resistance Tolerance: Up to ±1% or ±2%
3. Independent Linearity: Up to ±0.1%
4. Temperature Coefficient: As low as ±20ppm/°C
5. Temperature Drift: Approximately 90% lower than that of ordinary carbon-film potentiometers
6. High-Temperature and Low-Temperature Stability: In extreme temperature cycles ranging from -55°C to +125°C, resistance deviation remains ≤0.2%

Core Advantages

1. Unparalleled Stability: Thanks to its wire-wound structure and high-quality alloy wire materials, the WX118 exhibits far superior resistance stability compared to conventional carbon-film potentiometers. Even in complex environments, it maintains precise resistance values, providing reliable underlying performance support for equipment.
2. Extremely Low Noise: The wire-wound design ensures minimal noise during adjustment, preventing additional signal interference—particularly suitable for precision measurement, audio, and instrument applications where signal purity is critical.
3. Resistance to High Voltage and Large Current: With excellent electrical load capacity, it can withstand high-voltage and high-current conditions, making it ideal for stable use in medium-power devices and preventing equipment failure due to overload.
4. Exceptionally Precise Resistance: With resistance tolerances as tight as ±1% and independent linearity up to ±0.1%, it enables highly refined resistance adjustments, meeting the rigorous demands of high-precision experiments and calibration equipment.
5. Superior High-Temperature Performance: Featuring a temperature coefficient as low as ±20ppm/°C, it maintains resistance deviation within ≤0.2% even in extreme temperature ranges from -55°C to +125°C, with temperature drift reduced by approximately 90% compared to standard carbon-film potentiometers—fully suited for military, outdoor, and other extreme environments.

Core Product Value

1. Ultra-stable resistance performance provides dependable underlying control for precision equipment and military instruments, preventing device errors or failures caused by resistance drift.
2. Ultra-low-noise design ensures signal transmission purity, enhancing the accuracy of testing and experimental data as well as the operational stability of equipment.
3. Wide power compatibility and exceptional environmental resilience expand application scenarios, meeting the demanding requirements of medium-power and extreme-temperature conditions.
4. High-precision resistance adjustment helps precision calibration and experimental equipment achieve accurate parameter control, boosting overall device performance.

Target Customer Base

Manufacturers of high-precision linear power supplies, suppliers of precision laboratory testing equipment, manufacturers of military electronic devices, producers of precision calibration instruments, and companies developing high-end physics experiment apparatuses.

Application Scenarios

With its outstanding performance, the WX118 is widely used in scenarios demanding extreme precision and stability, including vintage aviation instruments, precision calibration power supplies, high-precision physics experiment apparatuses, military measurement and control equipment, and medium-power high-precision linear power supplies. In these applications, it accurately adjusts resistance values, stably transmits signals, and ensures continuous, reliable operation of equipment under complex conditions.

Solutions to Industry Pain Points

1. Addressing Carbon-Film Potentiometer Resistance Drift: Ordinary carbon-film potentiometers are prone to significant resistance drift due to fluctuations in ambient temperature and humidity. In contrast, the WX118 reduces temperature-induced drift by approximately 90%, maintaining resistance deviation within ≤0.2% even in extreme temperature environments, thereby completely resolving this common industry issue.
2. Solving Overheating Failures in Medium-Power Applications: Carbon-film potentiometers often overheat rapidly when handling several watts of power, leading to failure. The WX118 supports rated powers from 1W to 25W or even higher, with excellent heat resistance and current-carrying capacity, making it suitable for stable use in medium-power devices.
3. Enhancing Precision in Precision Equipment: Conventional potentiometers struggle to meet the stringent resistance tolerance and linearity requirements of high-precision devices. The WX118 offers resistance tolerances as tight as ±1% and independent linearity up to ±0.1%, providing precise resistance adjustment for precision equipment and improving overall device performance.

Common Questions FAQ

Q1: What are the core advantages of the WX118 compared to ordinary carbon-film potentiometers?
A: The WX118 uses constantan wire or nickel-chromium alloy wire for winding, reducing temperature drift by approximately 90% compared to ordinary carbon-film potentiometers. Its resistance tolerance is as tight as ±1%, with independent linearity reaching ±0.1%. It offers stronger stability, lower noise, and greater resistance to higher power levels and extreme temperature environments, thoroughly addressing the common shortcomings of carbon-film potentiometers.
Q2: What is the applicable power range of the WX118?
A: This potentiometer typically has a rated power of 1W–25W or higher, capable of meeting the resistance adjustment needs of most medium-power devices and stably handling high-current conditions.
Q3: Can the WX118 be used in military equipment?
A: Yes. The WX118 maintains resistance deviation within ≤0.2% even in extreme temperature cycles from -55°C to +125°C, with a temperature coefficient as low as ±20ppm/°C. Its unparalleled stability makes it an ideal choice for providing reliable underlying resistance control in military equipment.
Q4: What are the characteristics of resistance adjustment with the WX118?
A: Due to its wire-wound structure, the WX118 exhibits small, stepped changes in resistance, which imposes certain resolution limitations. However, this structure simultaneously delivers exceptionally high resistance accuracy and stability, making it particularly suitable for applications prioritizing precision over continuous adjustment.