The Trek Model 520 (±2kV) and Model 523 (±20kV) Hand-Held Electrostatic Voltmeters provide accurate, noncontacting measurements of electrostatic
surface voltage for ESD applications in either ionized or non-ionized environments.

These two voltmeters utilize a measurement technique that overcomes the disadvantage of the typical hand-held field-meter by providing surface voltage measurements which are essentially independent of the sensor probe-to-measured surface spacing.

Model 520 Key Specifications 

• Measurement Range: 0 to ±2 kV DC 

• Measurement Accuracy: Better than ±5% of full scale over the entire recommended probe-to-surface separation range of 5 mm to 25 mm 

• Speed of Response (10% - 90%): Less than 25 ms for a 0 to ±2 kV input step change (520-2 Voltage Monitor Output) 

Model 523 Key Specifications 

• Measurement Range: 0 to ±20 kV DC 

• Measurement Accuracy: Better than ±5% of full scale over the entire recommended probe-to-surface separation range of 30 mm to 60 mm 

• Sampling Rate: 2.5 readings per second