Calibration resistors Manufacturers online

Calibration resistors are precise resistive elements used in measurement technology to calibrate and check measuring devices and other electronic systems.

The calibration resistors are used to allow test currents to flow during the various test methods. The extent to which the measured voltage and current values displayed by the test device to be calibrated match the measured values of the external calibration measuring device is checked.

Below you will find an explanation of how calibration resistors work, an overview of typical resistance values and deviations, their areas of application and their important properties:

How they work:

Calibration resistors represent a very accurate resistance value that is used as a reference for calibration. They allow the measured value of a device to be compared with a defined and precise resistance value. This allows deviations to be detected and corrected.

Typical resistance values and deviations:

• Typical values are between 10 μΩ and 100 kΩ, depending on the application and the device to be calibrated.
• The tolerances range between ± 0.01 and a maximum of 1%

Areas of application:

1. Testing and adjusting measuring devices:
Electrical measuring devices that measure resistance, such as multimeters, are checked with calibration resistors.

2. Quality control:
Calibration resistors are used in laboratories and production facilities to ensure that the measuring devices provide correct values.

3. Calibration of resistance thermometers:
Particularly important for the calibration of Pt100 and Pt1000 sensors, which are based on precise resistance values.

Important properties:

• High accuracy: calibration resistors provide very accurate and stable resistance values.
• Long-term stability: They are stable over long periods of time and offer consistent values.
• Low temperature coefficient: They react little to temperature fluctuations and provide consistent results at different temperatures.

Calibration resistors are essential for the precise calibration of temperature and resistance-dependent measuring devices and sensors.

Here are the most important aspects to look out for when buying calibration resistors:

When purchasing calibration resistors, there are some crucial factors to consider to ensure they meet the requirements for accurate calibrations and measurements.

• Look for resistors with a very low tolerance, e.g. ±0.01% or better, to ensure accurate calibration.
• Very low resistance values are usually required for high current applications, e.g. in the milliohm or microohm range. This reduces voltage drops and minimizes heating.
• The resistor must be designed for use with high currents, e.g. from a few amperes up to several hundred or thousand amperes, depending on the application.
• Ensure that the resistor has been calibrated by the manufacturer and that a calibration certificate with the specified tolerances and uncertainties is included.
• Choose calibration resistors that maintain stable resistance values over a long period of time to enable repeatable calibrations.
• Low drift of the resistance value over time is important to maintain accuracy over years.
• The temperature coefficient indicates how much the resistance varies with temperature. Select calibration resistors with a very low TC (e.g. ±1 ppm/°C) to minimize temperature dependencies and maximize measurement accuracy.
• Select calibration resistors that correspond to the typical measuring ranges of your devices, e.g. 100 Ω for Pt100 sensors. Other common values are 10 Ω, 1 kΩ and 10 kΩ.
• Ensure that the calibration resistor has a robust design that is resistant to mechanical stress, vibrations and environmental influences.
• A protective housing or special insulation can help to protect the resistor from external influences such as moisture and dirt.
• Make sure that the manufacturer is ISO 17025 accredited to ensure that the calibration resistors meet the highest quality and calibration standards.
• A detailed calibration certificate documenting the resistance value and uncertainty is a must.
• Compare the prices of different suppliers and pay attention to the price-performance ratio, especially with regard to accuracy and long-term stability.
• A high-quality calibration resistor can be more expensive, but offers long-term benefits due to its durability and precision.

When purchasing calibration resistors, the focus should be on accuracy, long-term stability, temperature coefficient, suitable resistance values and certification by the manufacturer. High-quality calibration resistors ensure precise and reliable calibrations for your measuring devices.

Calibration resistors can be purchased from various suppliers. Comprehensive information about manufacturers and suppliers of Calibration resistors from all over the world can be found on Exportpages.