1. Standard test conditions: temperature 20 ° C, humidity 70%, for the test results are not different, can also be tested under normal temperature and humidity

2. Current sensitivity: the pointer is from the zero scale to the maximum scale (full scale position) Sensitivity 1200 uA ± 10 %

3. Internal impedance: 400Ω ± 10%

4. Insulation resistance: 500V DC plus 50M ohm or more for the outer box and electrical circuit of the meter. The insulation resistance of the meter case and the electrical circuit is tested by the 500V DC voltage.

5. Zero position: The meter uses the standard posture, and the position of the front end of the pointer and the center of the zero scale is used as the reference.

  The tolerance of the pointer and zero scale overlap is ±1mm

6. Equilibrium: The allowable error range of the meter when the standard position is tilted 90 degrees back and forth ±1mm

7. Sticker: Instantly add three times overcurrent to the full scale current, and slowly reduce it to a reading of 1/2 of the current sensitivity. At this point, the pointer will return to the scale of 1/3 of the scale.

8. Friction: When the current is added to the meter and slowly increased or decreased to a certain value, the error range of the indication point is ±1mm.

9. Brake: Instantly add the current value of the scale 2/3, within one second from the start to the time required for the pointer to indicate the position