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Use and Maintenance of Multi-Function Calibrator

A multi-function calibrator is an essential tool used in the calibration and verification of various instruments, including digital and analog meters, as well as locomotive systems. It ensures that measurements are accurate and reliable, which is crucial for on-site inspections and maintenance. Proper use and regular calibration of this device are vital to prevent measurement errors that could lead to misjudgments or even safety issues in critical operations.

The Role of a Multi-Function Calibrator

Multi-function calibrators like the SWP-CA102S/CA103 series are widely used as reference standards to verify and calibrate field instruments. These devices offer multiple functions, high precision, a wide measurement range, and high automation levels. They are ideal for daily calibration tasks such as checking 4.5-digit digital multimeters and various 0.2 and 0.5-grade pointer-type voltmeters. Ensuring proper use and maintenance of these calibrators significantly improves the reliability and accuracy of field measurements.

How to Use a Multi-Function Calibrator

The calibrator consists of a power supply, signal source, high-power amplifier, and sampling feedback unit. To ensure its stable and safe operation, it's important to follow specific guidelines:

Working Environment Requirements

The instrument contains sensitive components, so it should be placed in a dry, clean, and well-ventilated area. The ideal operating temperature is between 0°C and 40°C with a relative humidity of no more than 80%. Avoid placing it near heat sources or in areas with poor air circulation. Using an air conditioner can help maintain a stable environment and prolong the life of the device.

Power Connection

To avoid electric shock, always use a three-wire grounded power cord. Ensure the voltage matches the device’s requirements and that the fuse is properly installed before connecting it to a grounded socket. It's recommended to use a regulated power supply to protect the internal circuitry from voltage fluctuations.

Checking and Replacing the Fuse

If the device fails to operate, check the fuse. Follow these steps: 1. Turn off the power. 2. Open the fuse holder and gently remove the fuse using a screwdriver. 3. Replace the fuse with one of the correct specification (220V, 2A/250V). 4. Reinstall the fuse securely into the holder.

Preheating the Instrument

As a precision instrument, the calibrator must be preheated for at least 5 minutes to reach thermal stability. If the device has not been used for a long time or in high-humidity conditions, extend the preheating time up to 30 minutes. This ensures accurate readings and optimal performance.

Verification and Calibration Procedure

When performing verification or calibration, follow these key steps: 1. Do not exceed the calibrator’s output range. 2. Before turning on the output, set the switch to neutral and adjust the output to zero. Do not connect the device under test until ready. 3. Connect the appropriate output port using suitable test leads. For high-voltage tests, use leads rated for 1500V or higher. For current tests, use leads with a current density of about 3A/mm². 4. Select the correct range before testing to avoid damaging the device under test. Adjust the coarse and fine controls carefully, especially when working with high currents. 5. When using high-current ranges (e.g., 5A or 10A), limit the output time to prevent overheating and damage. 6. Always return the coarse and fine adjustment knobs to their minimum position before switching ranges or items to avoid overloading the instrument.

Calibration and Verification of the Multi-Function Calibrator

Each multi-function calibrator comes with an absolute uncertainty indicator for one year after factory calibration. During daily use, you can perform adjustments based on the following procedures:

Determining Maximum Allowable Error

The maximum allowable error is a key factor in determining whether the instrument meets technical specifications. Typically, the calibration cycle is one year. The absolute uncertainty of the SWP-CA102S/CA103 model serves as the standard for evaluating whether the instrument is within tolerance. After confirming the uncertainty, select a high-level standard for calibration and test the calibrator’s performance to determine if it is qualified.

Adjusting the Calibrator’s Indicators

The technical indicators of the calibrator reflect factors like drift and environmental effects. Some users prefer to adjust the device only when it goes out of tolerance, while others recommend periodic calibration during verification to ensure optimal performance. Regardless, the calibrator offers built-in self-calibration features that allow for optimization of its technical parameters during each calibration cycle.

Verification Cycle and Process

The verification cycle reflects how long the instrument can maintain its specified performance. A one-year absolute uncertainty is provided to indicate the stability of the device over time, accounting for temperature variations, linearity, and load changes. The verification process involves checking the instrument’s stability and recalibrating its technical specifications to ensure continued accuracy and reliability.