TREK Product - Probe Selection Chart

Products: Probes

Trek offers a variety of probe types and sizes. More information is provided on select probe models at our Voltmeter Probes web site page which can be accessed via any of the linked models in the chart below. Once there, scroll down the page to find the probe of interest. For other probe models or additional assistance, please contact us. Also note that helpful information is provided just below the following chart.

Probe Selection Chart (PDF version)

VOLTMETER	PROBE Model	DIMENSIONS	BODY SHAPE/ APERTURE LOCATION	SPECIAL FEATURE	SPEED OF RESPONSE	NOISE (rms)
Model 320C 0 to ±100 V DC or peak AC	3250	30.5 mm H 28.7 mm W 57.2 mm L	square / side	high sensitivity	less than 300 ms	less than 3 mV
Model 325 0 to ±40 V DC or peak AC	PD1216P	10 mm dia. 56 mm L	round / side	very high sensitivity	less than 3 ms	less than 1 mV
* Model 323 0 to ±100 V DC or peak AC * probes used with the Model 323 Model 344 0 to ±2 kV DC or peak AC and Model 347 0 to ±3 kV DC or peak AC	555P-1	5.6 mm sq. 49.8 mm L	square / side	miniature	less than 3 ms	less than 3 mV
	555P-4	5.6 mm sq. 49.8 mm L	square / end	miniature	less than 4.5 ms	less than 4 mV
	6000B-5C	11.2 mm dia. 65.7 mm L	round / end	high-resolution	less than 4.5 ms	less than 4 mV
	6000B-6	10.3 mm dia. 69.7 mm L	round / side	high-resolution	less than 3 ms	less than 3 mV
	6000B-7C *	11.2 mm dia. 65.7 mm L	round / end		less than 4.5 ms	less than 4 mV
	6000B-8 *	9.5 mm dia. 68.6 mm L	round / side		less than 3 ms	less than 3 mV
	6000B-13C	10.2 mm sq. 63.7 mm L	square / end	high-resolution	less than 4.5 ms	less than 3 mV
	6000B-14	10.2 mm sq. 68.7 mm L	square / side	high-resolution	less than 3 ms	less than 3 mV
	6000B-15C*	10.2 mm sq. 63.7 mm L	square / end		less than 4.5 ms	less than 4.5 mV
	6000B-16 *	10.2 mm sq. 68.6 mm L	square / side		less than 3 ms	less than 3 mV
	6300-7*	11.8 mm H 11.1 mm W 76.2 mm L	square / end	high temperature (to 100º C)	less than 4.5 ms	less than 10 mV
	6300-8*	11.8 mm H 11.1 mm W 76.2 mm L	square / side	high temperature (to 100º C)	less than 3 ms	less than 3 mV
Model 341B 0 to ±20 kV DC or peak AC	3450	11.8 mm H 11.1 mm W 76.0 mm L	square / side		less than 200 µs	less than 20 mV
	3453ST (similar style to 3450)	11.8 mm H 11.1 mm W 76.2 mm L	square / side	high temperature (to 100º C)	less than 200 µs	less than 20 mV
	3455ET (similar style to 3450)	11.8 mm H 11.1 mm W 76.2 mm L	square / end	high temperature (to 100º C)	less than 200 µs	less than 20 mV
Model 368A 0 to ±2 kV DC or peak AC and Model 370 0 to ±3 kV DC or peak AC	3800E-2	5.6 mm sq. 50 mm L	square / end	miniature	Model 368A is less than 200 us Model 370 is less than 50 us	Model 368A is less than 25 mV Model 370 is less than 20 mV
	3800S-2	5.6 mm sq. 50 mm L	square / side	miniature
	3870ET-2	5.6 mm H 5.6 mm W 50.0 mm L	square / end	high speed
	3870ST-2	5.6 mm H 5.6 mm W 50.0 mm L	square / side	high speed
Model 370 0 to ±3 kV DC or peak AC	7000ER	8.7 mm sq. 69.8 mm L	round / end		50 us	less than 20 mV
Model 370TR 0 to ±3 kV DC or peak AC	3627	11.8 mm sq. 72.2 mm L	square / side		less than 200 us	less than 20 mV
Model 370TR 0 to ±3 kV DC or peak AC	3629A	11.8 mm sq. 72.2 mm L	square / side	nonfringing transparent	less than 200 us	less than 20 mV

Selection Considerations

Aperture Size
The various aperture sizes available permit selection of spatial resolution and noise performance. Smaller aperture sizes provide finer spatial resolution. Larger aperture sizes provide lower noise.

End View/Side View
Trek probes are available with end-viewing or side-viewing detectors to accommodate the constraints of an installation.

Round and Square Bodied Probes
Selected Trek probes are available in round-body and square-body styles to accommodate different mounting requirements.

High Temperature
Probes are available with enhanced operating ranges for high temperature applications.

High Resolution
Probes are available with high resolution for critical measurements.

Transparent Probes
Transparent probes are used in applications where light must pass through the probe, such as photoconductor testing. This allows illumination and measurement of the same spot on the surface. The housing and sensitive electrode of the probe are made of a special optically transparent, electrically-conductive glass.

Special Purpose Probes
Trek application engineers can help solve many problems with custom designs and innovative solutions. Please contact TREK, INC. for more information.

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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 an electrostatic voltmeter is that it accurately measures surface potential (voltage) on any kind of material without physical contact and therefore, no charge transfer and loading of the voltage source can occur.

In practice, an electrostatic probe is placed close (1 mm to 5 mm) to the surface to be measured. The electrostatic voltmeter functions 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.

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esvm applications

Scientific, industrial, or research applications for Trek electrostatic voltmeter systems include:

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

Trek offers a wide variety of probes for use with the company's electrostatic voltmeters. If you are not sure which probe to use in your application please contact us for technical assistance. Email: custserv@trekinc.com )