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A capacitive encoder measures angular position using changes in an electric field between the rotor and stator. Unlike optical encoders, it does not rely on optical lenses or light sources, and unlike magnetic encoders, it is inherently immune to magnetic fields.
Netzer’s Electric Encoder™ technology combines high accuracy with generous installation tolerances, resistance to shock and vibration, and strong EMI/RFI performance. The latest VLZ series reaches accuracy levels of up to ±0.001°, depending on the model.
Capacitive encoders are holistic, multi-sensing, and provide high accuracy while allowing high installation tolerances. Moreover, immune to magnetic fields, compact hollow-shaft designs, and reliable operation without optical lens sensitivity.
Resolution defines the smallest detectable change in position that can be measured by the encoder. Accuracy defines how close the measured position is to the true position.
Some variable capacitance sensors are indeed quite sensitive to one or more of the above. However, the Electric Encoder™ breakthrough, which was made in the context of defense applications, has demonstrated the opposite and its superiority has been demonstrated in a wide range of applications besides defense. It is covered by several basic patents and relies on a continuous development effort since 1994.
The Electric Encoder™ provides the absolute position and its continuous, exceptionally smooth output signals proportional to the SIN and COS of the measured rotary displacement. Rather than directly encoding the displacement it leaves the encoding task to the A/D converter and software optimized for it.
Yes, the output signals convey the absolute rotary position without any movement.
Thanks to the relatively low number of ECR the output signals are confined to the low end of the frequency spectrum and are less prone to errors due to PWM noise. The absence of temperature, or time, degradation mechanisms ‐ ball bearings, LEDs, etc. virtually eliminate any failure mechanisms.
An internally generated space/time modulated electric field interacts with a rotor which is made of a dielectric composite material. The rotor includes a peripheral sinusoidally shaped 3D pattern that serves the Fine channel, and a recessed sinusoidal pattern that serves the Coarse channel. The electric field is integrated over the full rotor area (hence “holistic”) and the resulting signal is processed and separated into Sine and Cosine output channels. Since a common channel processes both the Sine and Cosine outputs they are nearly matched and the decoded angle is stable over time and temperature.
The Electric Encoder™ is inherently immune to magnetic fields, internally shielded from electrical fields, and is also insensitive to RFI as evidenced by many defense applications.
Very well, since it integrates signals over the entire rotor area, averaging out vibration effects. It is being used in demanding defense applications.
The Rotary Electric Encoder™ utilizes the entire physical area of the rotor at all times, unlike optical and magnetic encoders, which rely on only a small section. Additionally, its sine and cosine output signals are generated and processed within a common channel, ensuring high purity and precise matching. This design makes it highly resistant to mechanical assembly variations, vibrations, installation errors, temperature fluctuations, and contaminants. As a result, the traditional correlation between high measurement accuracy and precise mechanical construction is no longer a limiting factor.
Netzer encoders are designed for ease of integration, with generous installation tolerances and robustness to minor mechanical misalignments. They support standard industrial communication protocols such as BiSS-C and SSI and are complemented by configuration tools that simplify setup and calibration.
Netzer encoders are designed to meet stringent EMI requirements. Enhanced shielding can be requested when compliance with military standards is required.
In sensitive environments, grounding the cable shield can further improve the system’s EMI robustness.
Yes, Netzer encoders are simple to installation both in production and in development. The Encoder Explorer even gives a precise reading of the quality of installation to give reading.
Netzer encoders feature a simple push-button or app-based calibration process that requires just a few seconds of movement. This is a one-time setup—once calibrated, the encoder is ready to use. Additionally, its absolute position is instantly available upon wake-up, eliminating the need for recalibration.
A non-flat installation can affect accuracy. Proper alignment is recommended for optimal performance. However, Netzer value comes in the form of the holistic design that allows operation in descent mechanics while others might have greater issues.
If the gap is larger than specified, shims (that Netzer offers as accessories) or adjustments may be required to ensure proper alignment and functionality.
The required flatness depends on the encoder model, but precise mounting surfaces are essential for best performance.
Calibration tools typically include the use of our free downloadable Encoder Explorer application software.
Yes, specific models support SPI communication. Please check the product specifications.
No concern, this is one of the many advantages of capacitive technology that perform excellent in noisy EMI environments. Grounding is recommended to minimize electromagnetic interference for reliable performance.
Yes, proper grounding reduces noise and enhances signal integrity.
Using EVL with the Electric Encoder Explorer software, users can configure the encoder communication protocol, set the resolution in bits, enable/disable BIT (Built-In Test) alerts, and add a software-based multi-turn counter. The software also allows adjustment of the excitation frequency and the encoder bandwidth.
EVL is Netzer’s encoder model that allows users to modify encoder parameters such as resolution, communication protocols, and more, used for evaluation and configuration through the Electric Encoder Explorer software.
Segmental calibration requires at least 9°–30° of rotation, depending on the encoder model.
Yes, the EEC provides insights into installation quality, helping to optimize mechanical alignment.
The EEC requires proper connection, compatible software, and adherence to installation guidelines for accurate performance.
Check the connections, ensure the latest software version is installed, and refer to the troubleshooting guide. If issues persist, contact support.
An update is required during the initial installation to ensure optimal performance, compatibility, and access to the latest features. However, no further updates are needed after installation.
Not always. The EEC is used for calibration and diagnostics, but some Netzer encoders feature a push-button calibration, eliminating the need for the EEC in those cases.
SSI and BiSS-C absolute serial protocols are standard features. The VLZ model also supports A Quad B incremental output. The VLA series offers Sine and Cosine analog outputs, with documentation provided for customers to handle signal interpolation on their end.
The VLS series is LEO-space-proven and based on COTS technology adapted for LEO space missions. For GEO or more demanding space environments, dedicated space-grade encoder configurations are available upon request.
Yes, Netzer COTS VLS encoders are designed and tested to withstand LEO environments, including radiation exposure, low outgassing, and single-event effects.
VLS encoders are competitively priced, space-tested COTS solutions.
No, VLS encoders are tested only for LEO/MEO missions. For GEO applications, we have extensive experience in developing custom solutions based on specific SOW requirements.
Yes, Netzer has encoders that comply with relevant NASA standards and qualifications. Some products have space qualified cables, some are using COTS components that are tested for radiation and low outgassing requirements.
Our encoders have a proven track record of dozens of space missions, demonstrating reliability in harsh environments.
The encoder can tolerate brief exposure to 150°C, but prolonged exposure may impact performance.
The encoder is designed to operate in a wide temperature range from -55°C to 125°C, with specific limits depending on the model.
Yes, we offer batch testing to ensure performance before final integration.
Netzer encoders are designed for demanding operating environments, with capabilities that vary by product family and model. Depending on the configuration, Netzer solutions support requirements involving shock and vibration, temperature extremes, EMI/RFI, and magnetic fields.
Specific product families address specialized environmental requirements. The VLS series is designed and tested for LEO space applications, including radiation exposure and low-outgassing requirements. The VLT series supports high-temperature applications, with configurations operating up to +125°C, while the DS series features an encapsulated design for embedded applications.
Yes. Netzer’s CustomFit program supports applications where a standard encoder configuration does not fully meet the design requirements.
Customization options include scalable dimensions and form factors, mechanical interfaces and mounting features, performance trade-offs, electronic layout, output signals and communication requirements, and housing or material selection. Netzer engineers work directly with OEM customers to adapt the encoder to the requirements of the application.
Netzer Precision maintains internationally recognized quality management certifications, including ISO 9001:2015, ISO 13485:2016, and AS9100. Netzer also provides compliance documentation for REACH and RoHS requirements.
These standards support quality and supplier qualification requirements across applications including aerospace, defense, medical devices, and industrial systems.
Accuracy and resolution depend on the encoder family and model. Across Netzer’s current portfolio, nominal accuracy ranges from ±0.001° on the VLZ series to ±0.15° on compact models such as the VLP-13, with available resolutions ranging from approximately 14 to 26 bits.
Operating temperature, accuracy, resolution, and other performance specifications are model-specific, so the relevant product datasheet should be used when selecting an encoder for a particular application.
Netzer encoders are used in applications that require accurate absolute position feedback, compact integration, and long-term reliability. Typical applications include robotics, defense systems and gimbals, surgical and medical equipment, semiconductor manufacturing and metrology, space mechanisms, CNC and precision motion systems, and energy applications.
Netzer offers multiple product families covering a broad range of sizes and performance requirements for these applications.
No. Netzer absolute encoders provide position information immediately upon power-up, without requiring a homing sequence. This is particularly valuable in applications where homing is impractical or adds unnecessary startup time, such as robotics, defense systems, medical equipment, and multi-axis automation.
The existing Netzer FAQ also states that absolute position is instantly available upon wake-up after the initial calibration process.
An absolute encoder provides a unique position value for every shaft angle, so the position is available immediately at power-up without requiring movement. An incremental encoder generates pulses as the shaft rotates and relies on a reference point and pulse count to determine position. After a power interruption, an incremental system typically needs to re-establish its reference, while an absolute encoder can report its position immediately when power is restored.
Yes. Netzer encoders are competitively priced considering their high accuracy, compact design, immunity, and advanced sensing technology.
Pricing depends on the encoder type and quantity. Some encoders are designed for cost-sensitive industrial applications, while others are built to meet stricter performance or environmental requirements. Please contact Netzer or an authorized distributor to receive a quotation.
MTBF is estimated using standard reliability prediction methods based on component data, operating conditions, and environmental factors.
Only in the VLZ family, NCP can be used for monitoring and diagnostics during operation, although configuration changes are typically done during setup.
BiSS and SSI are operational position communication protocols used by motion controllers. NCP is used for configuration, calibration, diagnostics, and accessing internal encoder parameters.
NCP (Netzer Communication Protocol) is a communication protocol used to access encoder parameters, calibration, diagnostics, and internal data through Netzer tools. It is not an operational communication protocol.
Yes, Netzer encoders meet relevant environmental standards such as ISO 9001, Iso 13485, CE and more.
Yes, we offer customization options to fit specific requirements.
The lifespan depends on operating conditions, but Netzer encoders are designed for long-term reliability of over 15 years MTBF.
Most Netzer encoders are designed to achieve an MTBF of over 15 years, depending on the specific model and operating environment. This high reliability is largely due to the contactless and holistic, multi-sensing principle.
Yes, a longer cable can be used. Contact us for recommendations.
No, Netzer encoders are maintenance-free.
Netzer encoders use standard 28/30 gauge cables, selected for their flexibility to accommodate challenging installations. Various lengths and connector options are available. For detailed cable specifications, refer to your product guide. Space-grade cable options can be found in the VLS product guide. CustomFit and specialized cable and connector solutions are available upon request.
