Electrostatic Products

Trek 341B

High Speed, High Voltage, Electrostatic Voltmeter

Advanced Energy’s Trek 341B is a DC-stable, precision electrostatic voltmeter for non-contacting surface voltage measurements. And it features a field-nulling technique.

  • Measurement Range: 0 to ±20 kV DC or peak AC
  • Measurement Accuracy: Better than ±0.1% of full scale
  • Speed of Response: Less than 200 μs for a 1 kV step
  • Overview
  • Technical Specs
  • Documents
  • Accessories
  • Service & Support
  • Distributors


The high-speed Trek® 341B electrostatic voltmeter does not require fixed spacing to maintain DC-stability and high accuracy. It utilizes a field-nulling technique that allows you to measure stationary or moving surfaces. The Trek 341B also uses a patented probe design that eliminates the need for close-tolerance components. This design significantly improves noise and drift in high humidity and wide temperature ranges.


  • Measure stationary or moving surfaces
  • Eliminate the need for fixed spacing
  • Benefit from patented probe design that eliminates the need for close tolerance components 
  • Achieve DC stability and high accuracy with field nulling technique
  • Improve noise and drift performance


  • Precision voltage monitor output
  • Use low voltage replica of the measured electrostatic potential for monitoring purposes or  as a feedback signal in a closed loop system
  • Easy-to-read LED display
  • Optional probes offer versatility (order separately)
  • Operate via benchtop, or with optional hardware, in a standard 19-inch rack
  • NIST-traceable Certificate of Calibration provided with each unit

Select specifications are shown below. Please see product data sheet for additional specifications.

  • Performance

    Measurement Range

    0 to ±20 kV DC or peak AC

    Measurement Accuracy

    Better than ±0.1% of full scale, referred to
    the voltage monitor

    Speed of Response

    Less than 200 µs for 1 kV step. Less than
    5 ms for 20 kV step change

  • Voltage Monitor


    A buffered output provides a low-voltage
    replica of the measured voltage


    1/1000th of the measured voltage

    Output Noise

    Less than 0.1 Ω

  • Voltage Display

    Voltage Display

    4.5 digit LED display


    0 to ±19.99 kV


    1 V

  • Mechanical

    H x W x D

    230  x 441 x 432 mm (9.06  x 17.36  x 17)


    17 kg (37 lb)

  • Electrical

    AC Line Cord Receptacle

    Standard 3-prong with integral fuse holder

    Line Voltage

    Factory set for one of two ranges: 90 to 127
    V AC or 180 to 250 V AC, at 48 to 63 Hz

  • Typical Applications

    • Charge accumulation monitoring of LCD production processes
      Monitoring surface potentials in the electrostatic painting process
      Measuring of electrostatic potentials on polymers, rubber, fabrics, and paper

Specifications are subject to change without notice. Not all options and accessories are available for all models and configurations. Dimensions listed generally refer to standard configurations and module bodies only. Please confirm technical specifications and customizations with a sales representative. Advanced Energy is not responsible for errors or omissions.

Data Sheets


Non-Contacting Voltmeter Prober | Advanced Energy

Trek Non-Contacting Voltmeter Probes

We offer an assortment of probes with multiple views, shapes, and aperture sizes available. You can also choose from high temperature and resolution probes for extreme temperatures and critical measurements.

Documents & Support

View All Trek 341B Accessories

Global Support & Services

Maximize fab productivity and capital equipment ROI with world-class support through each product lifecycle stage — from startup to long-term operation. Our service offerings are based on more than three decades of precision power and applications expertise.

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Applications Support & Consulting

Accelerate tool installations and process development programs, or address specific applications concerns with Advanced Energy's dedicated applications consultants and engineering staff. Benefit from on-site reviews, analyses, and consultations.

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Decrease variability in maintenance costs and provide additional cost protection. Advanced Energy offers whole-box extended warranties.

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Product Support

U.S.: +1 800 446 9167
Asia: +86 29 8874 1895
China: 400 8899 130
EMEA: +44 800 032 1546
U.K.: 08000 321 546

Thin Film Support
Thermal Product Support
Other Technical Support


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