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The role of multi-function calibrator

As an important configuration of locomotives and other equipment, as well as various digital and pointer instruments for monitoring and measurement, which are necessary for on-site inspection and maintenance, they must be verified and calibrated by a multi-function calibrator to determine whether the measurement accuracy meets the requirements. The accuracy of the measurement standard instrument directly affects the on-line operation quality of the most instrument on the spot. If it is verified and used improperly, it will cause measurement inaccuracy. Lead to misjudgment of the measured parameters, and even affect the safe operation of the locomotive.

The SWP-CA102S/CA103 series multi-function calibrator is used as a measurement standard instrument to verify/calibrate each field instrument. The instrument has many advantages such as multi-function, high accuracy, wide measuring range, high degree of automation, good stability and convenient use. It can efficiently and reliably complete the four-and-a-half digital three-meter meter, various grades of 0.2 and 0.5. Daily calibration/calibration of the following pointer-type voltmeters. Therefore, proper maintenance and use of the multi-function calibrator is of great significance for the daily use and verification/calibration of field instruments.

How to use the multi-function calibrator

The multi-function calibrator consists of a power supply, a signal source, a high-power amplifier, and a sampling feedback unit. It has strong stability, high index accuracy, and strong load capacity. In order to ensure its reliable operation, the following points should be noted:

Working environment requirements

The multi-function calibrator is equipped with a high-power amplifier and a temperature-sensitive reference component. Therefore, the instrument should be placed in a well-ventilated, dry, clean, clean place, especially if the vents of the instrument cannot be shielded and effectively Achieve air convection. The instrument is suitable for operation in an environment with a ring temperature of 0 to 40% and a relative humidity of 80% or less. Therefore, the air conditioning device can ensure the stability of the instrument.

Power connection

In order to avoid the danger of electric shock, the three-wire power cord should be used and grounded reliably. After checking that the power supply voltage of the connected person is correct and the fuse is installed correctly, the multi-function calibrator can be connected to the reliable grounded three-wire power socket.

The input power supply is preferably regulated to prevent the fluctuation of the external power supply from damaging the power supply circuit of the instrument.

Check replacement fuse

Check and replace the fuse as follows:

1) Disconnect the power supply;

2) Open the fuse holder, insert the blade of the screwdriver on the left side of the fuse holder, and gently shake it until it can be removed by hand;

3) Remove the fuse from the fuse holder for replacement or inspection. When reinstalling, be sure to install the fuse of the correct specification (220V, 2A/250V);

4) Push the fuse holder back to its original position until it locks.

Instrument preheating

The multi-function calibrator is a precision instrument. To achieve the best index, the instrument must be fully preheated to make the internal unit of the instrument reach thermal stability before it can be used normally. Under normal circumstances, preheat for 5 minutes. If it is not used for a long time or when the humidity is high, the preheating time should be longer, and the longest time should not exceed 30 minutes.

Verification/calibration test

1) It is forbidden to exceed the detection range of the multi-function calibrator range.

2) Power-on: The multi-function calibrator has a high-voltage and high-current output function. Before starting the output, the output item selection switch should be placed in the neutral position, the output is adjusted to zero, and the output terminal should not be connected to the instrument to be inspected.

3) Connection: Select the output port of the calibrator according to the item and gear position of the checklist, and connect the checklist and the calibrator reliably with the test line. Test lines with an insulation strength of 1500V or higher should be used when testing high voltages; test lines with a current density of about 3A/mm2 should be used when testing currents.

4) At the time of inspection, the corresponding range should be selected before the power can be tested to avoid damage to the instrument under test due to improper gear selection or personal safety. In case of open circuit of the metered current circuit and fine adjustment of the current output “coarse adjustment”, if there is no response between the meter and the instrument display, the knob should not be adjusted to avoid damage to the instrument; the load is large and the volume is gradually increased. Coarse adjustment" and the watch and instrument display changes little. The verification work must be stopped immediately.

5) When the current file (5A, 10A) is used near the upper limit, the time for outputting the indication value should not be too long, otherwise the instrument may be damaged.

6) Every time or item is checked. The output “coarse” and “fine” knobs (counterclockwise) should be rotated to the minimum position before allowing conversion to other ranges or other items. In order to avoid damage to the meter and instrument output circuit due to excessive output voltage and current.

Calibration and verification of multi-function calibrator

The multi-function calibrator is factory-provided with an absolute uncertainty indicator within one year after calibration. During daily use, the multi-function face meter can be adjusted by the following procedure.

Determination of the maximum allowable error

The maximum allowable error is the basic basis for the measurement of the positioning mechanism to determine whether the instrument meets the requirements of the technical indicators. First, to clarify the calibration/calibration cycle, usually the calibration period is one year. Then, the absolute uncertainty index of the Shaoxing Zhongyi CA102S/CA103 multi-function calibrator should be used as the basis for judging whether the instrument is out of tolerance.

After the absolute uncertainty indicator of the multi-function calibrator is clarified, the calibration standard, that is, the high-level standard table, is selected according to the index, and the calibrator indicators are tested to determine whether the multi-function calibrator is qualified.

Multi-function calibrator indicator adjustment

The technical indicators given by the multi-function calibrator mainly reflect the effects of instrument accumulation drift and environmental impact. In the use of the verification process, when it is necessary to adjust the output of the instrument, one view is that adjustment is only made when the instrument is out of tolerance or close to the tolerance; another point of view is that when possible, in the implementation of the verification During the process, it should be calibrated. The day is to put the actual performance of the instrument in the middle of its range to make the instrument in the best condition. Regardless of whether the verification point is out of tolerance, the multi-function calibrator has the functions of source calibration and internal software self-calibration, and each calibration cycle can be calibrated and adjusted to optimize its technical specifications.

Verification cycle and verification process

Technical specifications are technical requirements that the instrument can meet at specific time intervals. This time reflects the calibration/calibration cycle, which reflects the ability to maintain its given specifications for a specific period of time. The verification process is to determine the ability of the instrument to maintain technical specifications during the verification interval. A one-year absolute uncertainty indicator is given to the multi-function calibrator, reflecting the stability of the instrument within 1 year after calibration, the influence of temperature influence factors, linearity, transmission line and load adjustment, and the calibration standards used. Source capacity, the sum of these effects is less than absolute uncertainty. The verification of the instrument is to assess this indicator.

For the verification/calibration of the multi-function calibrator, the calibration should be performed first to determine that the stability, drift and other factors of the instrument meet the requirements during the verification period; then, the technical specifications of the instrument are calibrated to optimize the technical specifications.