For information about electrostatic voltmeter technology and applications, click here.
| Infinitron® Ultra-High Impedance Voltmeters |
Measurement Range (DC or peak AC) |
Speed of Response (10% to 90%) |
Accuracy | Data Sheet | ||
|---|---|---|---|---|---|---|
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 | |
||
| Voltmeter | Measurement Range | Accuracy | Available Probes | Data Sheet | Voltmeter | Measurement Range | Accuracy | Available Probes | Data Sheet |
|---|---|---|---|---|---|---|---|---|---|
![]() 341B High-voltage High Speed |
0 to ±20 kV | 0.1% of full scale | ![]() 430 High Speed/USB port |
0 to ±2 kV | 0.05% of full scale | ||||
![]() P0865 High Speed |
0 to ±10 kV | 0.1% of full scale | ![]() 368A High Speed Multichannel enclosure |
0 to ±2 kV | 0.1% of full scale | ||||
![]() 370 High Speed High Resolution |
0 to ±3 kV | Better than 0.05% of full scale | ![]() 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 |
![]() 323 High Sensitivity |
0 to ±100 V | 0.05% of full scale | ||||
![]() 347 Economical |
0 to ±3 kV | 0.05% of full scale | ![]() 320C High Sensitivity |
0 to ±100 V | 0.05% of full scale | ||||
![]() 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 |
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.
Scientific, industrial, or research applications for Trek electrostatic voltmeters include: