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Precision Electrostatic Charge Monitoring Instruments

Trek's electrostatic voltmeters accurately measure surface potential (voltage) on materials.

Infinitron® Ultra-High Impedance Voltmeters

Trek's new ultra-high impedance voltmeters (Model 800 & Model 820) allow contacting voltage measurements with virtually no charge transfer.

Model	Measure- ment Range (DC or peak AC)	Speed of Re- sponse (10% to 90%)	Accuracy	Special Feature
Infinitron® 800	0 to ±100 V	Less than 3.5 ms for a 100 V step	0.1% of full scale	Allows contacting voltage measurements with virtually no charge transfer (download PDF product sheet)
NEW Infinitron® 820	0 to ±2 kV	Less than 750 us for a 1 kV step	0.1% of full scale	Allows contacting voltage measurements with virtually no charge transfer (download PDF product sheet)

Electrostatic Voltmeter Models

Trek's non-contacting technology avoids the problems of arc over between the probe and measured surface, delivering a high accuracy measurement that is virtually insensitive to variations in probe-to-surface distances.

Model	Measure- ment Range (DC or peak AC)	Speed of Re- sponse (10% to 90%)	Accuracy	Special Feature
NEW 430	0 to ±2 kV	Less than 50 us for a 1 kV step	0.05% of full scale	(Non contacting) high speed / USB port
320C	0 to ±100 V	Less than 300 ms for a 100 V step	0.05% of full scale	(Non contacting) high sensitivity
323	0 to ±100 V	Less than 300 ms for a 100 V step	0.05% of full scale	(Non contacting) high sensitivity with a variety of probes
325	0 to ±40 V	Less than 3 ms for a 40 V step	0.05% of full scale	(Non contacting) Very high sensitivity
341B	0 to ±20 kV	Less than 200 us for a 1 kV step	0.1% of full scale	(Non contacting) high-voltage, high speed
NEW P0865	0 to ±10 kV	Less than 200 us for a 1 kV step	0.1% of full scale	(Non contacting) high speed
344	0 to ±2 kV	Less than 3 ms for a 1 kV step	0.05% of full scale	(Non contacting) most widely used in electro photography
347	0 to ±3 kV	Less than 3 ms for a 1 kV step	0.05% of full scale	(Non contacting) economical
368A	0 to ±2 kV	Less than 200 us for a 1 kV step	0.1% of full scale	(Non contacting) high speed, multichannel enclosure
370	0 to ±3 kV	Less than 50 us for a 1 kV step	Better than 0.05% of full scale	(Non contacting) high speed, high resolution
370TR	0 to ±3 kV	Less than 200 us for a 1 kV step	Better than 0.05% of full scale	(Non contacting) transparent probe

PROBE INFORMATION CHART

Trek offers a wide variety of probes for use with the company's electrostatic voltmeters. Please refer to our Probe Information Chart for more information.

If you are not sure which probe to use in your application
please contact us for technical assistance. (Email: custserv@trekinc.com )

Electrostatic Voltmeters

Many voltage measurement applications cannot be made using conventional contacting voltmeters because they require charge transfer to the voltmeter, thus causing loading and modification of the source voltage. For example, when measuring voltage distribution on a dielectric surface, any measurement technique that requires charge transfer, no matter how small, will modify or destroy the actual data. In these types of applications a new approach to voltage measurement is needed.

An instrument that measures voltage without charge transfer is called an electrostatic voltmeter. A primary characteristic of electrostatic voltmeters is that they accurately measure surface potential (voltage) on materials without making contact and, therefore, no electrostatic charge transfer and loading of the voltage source can occur.

In practice, an electrostatic charge monitoring probe is placed close (1 mm to 5 mm) to the surface to be measured. Electrostatic voltmeters function to drive the potential of the probe body to the same potential as the measured unknown. This achieves a high accuracy measurement that is virtually insensitive to variations in probe-to-surface distances, as well as preventing arc-over between the probe and measured surface.

Voltmeter Characteristics

Scientific, industrial, or research applications for Trek electrostatic voltmeters include:

• Research and development of electrophotographic processes
  
• Monitoring of the light decay of photoreceptors
  
• High-speed measurements of photoreceptor characteristics
  
• Monitoring of contact potential
  
• Material evaluation
  
• Electrostatic charge accumulation monitoring of LCD production processes
  
• Monitoring surface potentials in electrostatic painting processes
  
• Measuring electrostatic potential on polymers, rubber, fabrics, and paper
  
• Electrostatic charge accumulation monitoring in clean rooms
  
• Radiation effect studies
  
• Measuring electrostatic potential on moving objects or surfaces