Electrostatic Products

Trek 541A

Non-Contacting Electrostatic Voltmeter for EOS and ESD Processes

Advanced Energy's Trek 541A provides highly accurate, non-contacting, DC-stable, spacing-independent voltage measurements in either ionized or non-ionized environments. Typical uses include semiconductor, LCD, electronic assembly, and ESD-sensitive applications. 

  • Measurement Range:
    • 541A-1: ±1 kV DC or peak AC
    • 541A-2: ±100 V DC or peak AC
  • Measurement Accuracy: Better than ±1% of full scale over a probe-
    to-surface separation of 2.5 mm ±1 mm
  • Alphanumeric LCD Display: 20 x 4 characters
  • Overview
  • Technical Specs
  • Documents
  • Accessories
  • Service & Support
  • Distributors


The Trek® 541A (pictured with the Model 541PR-S probe) electrostatic voltmeter is configured with a miniature electrostatic field chopper probe. The probe can be remotely located and easily positioned within process equipment. The unit's 20 x 4 alphanumeric LCD screen displays the present measured voltage, positive and negative peak voltage values, and additional menu information. Visual and audible alarms activate when preset voltage-threshold levels are reached.


  • Enable drift-free measurements
  • Remotely locate or easily position miniature field chopper probe
  • Use in ionized or non-ionized environments
  • Take spacing-independent voltage measurements




  • Chopper probe is DC-stable with or without incident airflow
  • Analog voltage monitor output
  • USB and RS-232 serial ports
  • NIST-traceable calibration certificate provided with each unit
  • Walking test adapter kit available

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

  • Performance

    Measurement Ranges

    • 541A-1: 0 to ±1 kV DC or peak AC
    • 541A-2: 0 to ±100 V DC or peak AC

    Speed of Response (10 to 90%)

    Less than 50 ms for a ±1 kV/±100 V step (model dependent)


    1% of full-scale



  • Mechanical

    H x W x D

    97 x 152  x 204 (3.8 x 6 x 8)


    0.77 kg (1.7 lb)

  • Operating Conditions


    15 to 35°C (59 to 95°F)

    Relative Humidity

    5 to 85% relative humidity, non-condensing


    To 2000 m (6561.68 ft)

  • Typical Applications

    • Semiconductor
    • LCD
    • Electronic assembly
    • ESD-sensitive processes

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.


Trek Walking Test Case and Probe Holder Cap

Trek Voltmeter Accessories

Accessories compatible with the Trek electrostatic voltmeters.

Advanced Energy Digital Assets Icon

Trek Serial Chart Installer Software

Software for Trek 541 and 542 - includes continuous data acquisition

Documents & Support

View All Trek 541A 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

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