Calibration and Inspection Center for Measuring Instruments issues testing report

Calibration and Inspection Center for Measuring Instruments issues testing report

The following is an example of a voltage tester calibration procedure:

Pre-calibration preparation

1. Check the appearance of the voltage tester to ensure that there is no damage or deformation, and that the connecting wires, test electrodes, etc. are normal.

2. Confirm that all components of the tester are complete and that buttons, switches, and other functions are functioning properly.

3. Prepare calibration equipment such as standard voltmeters, standard ammeters, and standard resistors with appropriate range and accuracy requirements.

4. Preheat the voltage tester for about 30 minutes to stabilize its performance.

5. The calibration environment temperature is maintained at (20 ± 5) ° C, the relative humidity is less than or equal to 75%, the power supply voltage is (220 ± 10%) V, and the power supply frequency is 50 or 60Hz.

Calibration steps

1. Voltage calibration: Connect the standard voltmeter to the output terminal of the voltage tester, and set the voltage tester to a single voltage withstand test state. Press the start button and adjust the voltage adjustment knob to make the standard voltmeter reading reach the calibration point of each range. If the full calibration range is within the range of 40% Um to 100% Um, select no less than 4 points uniformly, and for other ranges, select 40% Um, 70% Um, and 100% Um. Check whether the voltage display window value of the tester is consistent with the standard voltmeter. If not, adjust the corresponding potentiometer on the printed board.

2. Current calibration: Connect the standard ammeter to the voltage tester, select a suitable load resistor and connect it in series to the test circuit. Set the withstand voltage tester to the state of single withstand voltage test, place the leakage current selector switch in the appropriate gear, press the start button to make the instrument in the test state, adjust the output voltage to make the reading of the standard ammeter a specific value, and then adjust the potentiometer of the withstand voltage tester to make the reading of the instrument ammeter consistent with that of the standard ammeter. Check if the alarm values for different current levels are within the specified range.

3. Insulation resistance calibration: Set the instrument to a single insulation resistance test state, connect the standard resistor to the test terminal, and the resistance indication should be consistent with the standard resistor. Otherwise, adjust the corresponding potentiometer on the printed board.

4. Voltage holding time verification: Select at least one verification point within the range of more than 20 seconds, with 60 seconds being a mandatory point. Also select at least one verification point within the range of less than or equal to 20 seconds. Set the voltage holding time of the withstand voltage tester as the verification point time, start the test, and observe whether the actual holding time of the tester matches the set time.

Work after calibration

1. Check again whether the functions of the voltage tester are normal.

2. Organize calibration equipment and tools.

3. Record calibration results, including calibration date, calibration personnel, calibration data, etc., and issue calibration certificates or reports.

4. For pressure testers that fail calibration, they should be labeled, stopped from use, sent for repair or scrapped.

The calibration cycle is generally one year. If the usage environment is harsh or frequent, the calibration cycle can be appropriately shortened.

Calibration and Inspection Center for Measuring Instruments issues testing report

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Our measurement process:
1. Send the instrument calibration list to the customer, which includes (instrument name, model, quantity in a table), and send it to our salesperson to arrange a written quotation;
2. Both parties shall coordinate prices, reach a cooperation agreement, and determine the time for engineers to inspect at the factory or for self delivery;
3. Arrange engineers to go to the factory for calibration or retrieve calibration according to the agreed time;
4. Within 3-5 working days, issue the calibration certificate and return or retrieve the instrument;
5. Send out certificates and invoices, provide follow-up tracking services

Service advantages:
1. The service mode is flexible, with three calibration methods: factory calibration, on-site collection of instruments, and express delivery of instruments
2. Factory calibration services can be arranged nationwide, with no more than 3 working days from placing an order to arranging for factory calibration, on-site collection of instruments, and express delivery of instruments, ensuring that it does not affect the normal operation of customers
When the instruments entrusted by the customer to our company for calibration exceed the tolerance, we can provide free calibration services within our capabilities (without repair)
4. It usually takes 5 working days from on-site calibration to certificate issuance (unless otherwise agreed), and 6 working days for those brought back to our company for calibration (10 working days for proxy inspection). If urgent arrangements are needed, please make an appointment in advance
5. There are branch offices in various cities across the country that can arrange on-site services.