The Trek Models 876 and 884 Hand-Held Electrostatic Voltmeters provide accurate, noncontacting measurements of electrostatic surface voltage for ESD applications in either ionized or non-ionizedenvironments. Industrial applications include measuring charge accumulation in the LCD manufacturing process or measuring static charge in semiconductor production. The Models 876 and 884 voltmeters utilize a new measurement technique that overcomes the disadvantage of the typical hand-held fieldmeter by providing surface voltage measurements which are essentially independent of the sensor probe to measured surface spacing.
Model 876 (0 to ±2 kV DC)
Over a spacing range of 5 mm to 25 mm, the 876 voltmeter provides better than a 5% voltage measurement accuracy, while the typical fieldmeter provides a voltage measurement error in excess of 50%.
Model 884 (0 to ±20 kV DC)
Over a spacing range of 30 mm to 60 mm, the 884 voltmeter provides greater than a 5% voltage measurement accuracy, while the typical fieldmeter provides a voltage measurement error in excess of 50%.
The Models 876 and 884 hand-held voltmeters employ an efficient and compact sensor probe design. The probe design allows for higher spatial resolution capability by allowing the measurement of small surface areas.
The probe is attached to the meter with 6 feet of cable length. The length of cable provides the flexibility to make measurements in many locations that are impossible to reach using the large bulky sensing surfaces of the typical hand-held fieldmeter. A "hold" push button retains the displayed measured voltage value for recording purposes. The Models 876 and 884 provide a measurement system with calibration traceable to the National Institute of Standards and Technology.