TREK Product - Precision Electrostatic Charge Monitoring Instruments

Electrostatic Voltmeters

For information about electrostatic voltmeter technology and applications, click here.

Contacting Voltmeters

Infinitron® Ultra-High Impedance Voltmeters	Measurement Range (DC or peak AC)	Speed of Response (10% to 90%)	Accuracy
Infinitron® 800	0 to ±100 V	Less than 3.5 ms for a 100 V step	0.1% of full scale
NEW Infinitron ® 820	0 to ±2 kV	Less than 750 us for a 1 kV step	0.1% of full scale

Non-Contacting Voltmeters

Voltmeter	Measurement Range	Accuracy	Available Probes	Voltmeter	Measurement Range	Accuracy	Available Probes

341B High-voltage High Speed	0 to ±20 kV	0.1% of full scale	3450 3453ST 3455ET	430 High Speed/USB port	0 to ±2 kV	0.05% of full scale	430P E
P0865 High Speed	0 to ±10 kV	0.1% of full scale	3450 3453ST 3455ET	368A High Speed Multichannel enclosure	0 to ±2 kV	0.1% of full scale	3800E 2 3800S 2 3870ET 2 3870ST 2
370 High Speed High Resolution	0 to ±3 kV	Better than 0.05% of full scale	3800E 2 3800S 2 3870ET 2 3870ST 2 7000ER	706B Low Noise Durable Design	0 to ±1 kV	0.05% of full scale
370TR Transparent Probe	0 to ±3 kV	Better than 0.05% of full scale	3627 3629A	323 High Sensitivity	0 to ±100 V	0.05% of full scale	6000B 7C 6000B 8 6000B 15C 6000B 16 6300 7 6300 8
347 Economical	0 to ±3 kV	0.05% of full scale	555P 1 555P 4 6000B 5C 6000B 6 6000B 7C 6000B 8 6000B 13C 6000B 14 6000B 15C 6000B 16 6300 7 6300 8	320C High Sensitivity	0 to ±100 V	0.05% of full scale	3250
344 Most widely used in Electrophotography	0 to ±2 kV	0.05% of full scale		325 Very High Sensitivity	0 to ±40 V	0.05% of full scale	PD1216P

Electrostatic Voltmeter Technology

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.

Electrostatic Voltmeter Applications

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