Electrostatic Voltmeters

Information about Electrostatic Voltmeter Technology and Electrostatic Voltmeter Applications is provided below the table.
Trek also offers additional non-contacting voltmeters for ESD measurement.

Contacting Voltmeters

Infinitron® Ultra-High
Impedance Voltmeters
Resistance Capacitance Measurement Range
(DC or peak AC)
Speed of Response
(10% to 90%)
Accuracy Data Sheet
Trek Model 800Infinitron® 800 1 x 1016 Ω
1 x 10-15 F
0 to ±100 V Less than 3.5 ms
for a 100 V step
0.1% of full scale PDF
Trek Model 820 Infinitron® 820 1 x 1015 Ω
1 x 10-15 F
0 to ±2 kV Less than 500 µs
for a 1 kV step
0.1% of full scale PDF
1 x 1014 Ω
1 x 10-14 F
0 to ±2 kV Less than 500 μs
for a 1 kV step
±1% of full scale PDF
  The Infinitron® models may also be used in Noncontacting mode.  

Non-Contacting Voltmeters

Voltmeter Measurement Range Accuracy Available Probes Data Sheet Voltmeter Measurement Range Accuracy Available Probes Data Sheet
                         See our FAQ for probe fixture information.  
Trek Model 341B
341B
High-voltage
High Speed
0 to ±20 kV 0.1% of full scale PDF Trek Model 368A
368A

High Speed
Multichannel enclosure
0 to ±2 kV 0.1% of full scale PDF
Trek Model P0865
P0865

High Speed
0 to ±10 kV 0.1% of full scale PDF
706B
Low Noise
Durable Design
0 to +1 kV
or
0 to -1kV
0.5% of full scale   PDF
Trek Model 370
370

High Speed
High Resolution
0 to ±3 kV Better than 0.05% of full scale PDF Trek Model 323
323

High Sensitivity
0 to ±100 V 0.05% of full scale PDF
Trek Model 370TR
370TR

Transparent Probe
0 to ±3 kV Better than 0.05%
of full scale
PDF Trek Model 320C
320C

High Sensitivity
0 to ±100 V 0.05% of full scale PDF
Trek Model 347
347

Economical
0 to ±3 kV 0.05% of full scale PDF Trek Model 325
325

Very High Sensitivity
0 to ±40 V 0.05% of full scale PDF
Trek Model 344
344

Most widely used in Electrophotography
0 to ±2 kV 0.05% of full scale PDF          
Electrostatic Voltmeter Technology

Many very high impedance (> 1010 Ω) voltage measurements cannot be made using conventional type voltmeters because charge transfer into the voltmeter is required, 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 an electrostatic voltmeter is required.

An instrument that measures voltage with virtually zero charge transfer is called an electrostatic voltmeter. A primary characteristic of electrostatic voltmeters is that they accurately measure surface potential (voltage) on devices or surfaces, with or without physical contact.

Trek is known for its novel non-contacting voltmeter designs, first introduced in 1968, to address charge transfer issues associated with the contacting voltmeter designs at the time. With these non-contacting electrostatic voltmeters an electrostatic voltage monitoring probe is placed in close proximity (1 mm to 5 mm) to the surface to be measured. These electrostatic voltmeters function to drive the potential of the probe body to the same potential as the measured unknown. This achieves a high accuracy non-contacting measurement that is insensitive to variations in probe-to-surface distances and prevents arc-over between the probe and measured surface.

Trek’s more recently developed novel Infinitron® ultra-high impedance voltmeter technology is ideal for voltage measurement applications that demand virtually infinite loading impedance levels, far beyond the reach of currently available high impedance voltmeter instruments. The Infinitron technology enables contacting (and non-contacting) measurements to be made with virtually no charge transfer due to incredibly high input resistance of 1016 Ω combined with incredibly low input capacitance of 10-15 farads. This allows Trek’s Infinitron products to indicate, with high precision, the voltage level of objects and surfaces – even before contact is made.

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Electrostatic Voltmeter Applications

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

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