1. First observe the dial of the multimeter. You will see that the multimeter has many gears, but these gears need to be calibrated.

2. Then use the standard to calibrate the multimeter. When calibrating the power supply, output voltages of +100mV, +1V, +10V, +100V and +1000V respectively, and record the indicated values.

3. When calibrating the DC voltage block of the multimeter, output voltages of 200mV, 2V, 20V, 200V and 1000V respectively, and record the indicated values.

4. When measuring the electronic block, a standard resistance box is needed for measurement. The resistance value of the resistance box generally used is 200Ω-20MΩ. Then measure several resistance values and record them separately.

5. Compare the recorded indications to see if the error value is within the specified position. If not, it is unqualified.