Portable Electrostatic Charge Meter

Calibration environmental conditions and requirements are as follows:
a) Ambient temperature: 20 °C ± 5 °C
b) Relative humidity: 30-60%
c) There should be no measurable electrical, magnetic, positive, or negative ions in the environment.
d) Grounding wire, grounding wire resistance <100Ω

2. Calibration Equipment
The equipment used for calibration must be calibrated by a metrology technical organization to meet calibration requirements and be within its validity period.

Calibration equipment mainly includes: DC high-voltage meter, DC high-voltage power supply, standard flat electrode, distance adjuster, etc. The test table is placed on the center line of the calibration plate. The block diagram of the non-contact electrostatic voltmeter calibration device is as follows:

The equipment and equipment requirements are as follows:

C--Product to be calibrated: static test table

D1--DC high-voltage power supply: output range -30KV to +30KV, continuously adjustable or minimum step 1V, measurement uncertainty must be less than 1/4 of the permissible error limit specified in the calibration table;

D2--DC high voltage meter: measurement range -40KV～+40KV, measurement uncertainty should be less than 1/4 of the calibration table's permissible error limit;

D3--Standard plate electrode: The plate electrode should be round or square-round. The curvature radius of the electrode edge should not cause corona formation. It is recommended that the electrode edge be wrapped with insulating material; the area of the plate should be sufficiently large. The diameter or edge length should not be less than 0.4 m. The size of our calibration plate is a 600mm*600mm square stainless steel plate.

-Protection resistance: The resistance of the protection should be >20KV, the protection current and human body current should be <5mA, and the resistance value should meet the requirements of the following formula:

Here: the unit for protection resistance is ohm (Ω);

The resistance of the insulation bracket is in ohms (Ω), resistance >1013Ω, and pressure resistance >25KV.

The different resistance values of the above two resistors may cause the static voltage values detected under the same standard voltage to be different.

S1 - Insulation bracket S2 - Scale, measurement range: 5mm to 700mm, measurement uncertainty less than 0.5mm

S3 - Distance adjuster: Place the test measurement device on top of the calibration device. The front end of the test table should be extended. The geometry and material of the support structure should be minimized so as not to affect the electric field distribution at the front end of the test diagram.