Electrostatic Products

Trek 325

High Sensitivity, DC Stable Electrostatic Voltmeter, Measures 0 to ±40 V

Advanced Energy's Trek 325 electrostatic voltmeter is a versatile instrument. It performs non-contacting electrostatic voltage measurements in contact potential (surface work function) determination, materials evaluation, and electret studies applications. 

  • Measurement Range: 0 to ±40 V DC or peak AC
  • Accuracy: Better than0.05% of full-scale
  • Speed of Response (10 to 90%): 
    • Fastest Speed Setting: Less than 3 ms for a 10 V step
    • Slowest Speed Setting: Less than 5 ms for a 10 V step
  • Overview
  • Technical Specs
  • Documents
  • Accessories
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The Trek®  was specifically designed for high sensitivity applications. It enables highly accurate, low noise, non-contacting measurement of electrostatic voltages of 0 to ±40 V over a wide range of probe-to-surface distances. A dual-range front panel 3.5-digit LED display resolves ±10 mV.  And you can monitor the measured voltage through a precision 1:1 voltage monitor output and/or a 10:1 voltage monitor output. 


  • Utilize low impedance probe sensor that assures high accuracy in high humidity and contaminated environments (e.g. airborne dust, toner, ions, and chemicals)
  • Minimize variation in monitored voltage values as the probe-to-test surface spacing changes
  • Operate or, with optional hardware, in a half 9.5-inch or standard 19-inch rack
  • Benefit from speed control that adjusts the Trek 325's AC response



  • Sensitivity: 1 mV
  • Null Voltage Source: 0 to ±10 V calibrated supply 
  • Drift/spacing null adjustment
  • Response speed control
  • Voltage monitor output

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

  • Performance

    Measurement Range

    0 to ±40 V DC or peak AC

    Measurement Accuracy

    • Voltage Monitor Output: Better than ±0.05% of full-scale.
    • Voltage Display: Better than or equal to ±2 counts, referred to the voltage monitor

    Speed of Response

    • Fastest Speed Setting: Less than 3 ms for a 10 V step
    • Slowest Speed Setting: Less than 5 ms for a 10 V step
  • Voltage Monitor


    See data sheet


    1:1 and/or 10:1 of the measured voltage

    Output Current

    5 mA minimum

  • Front Panel Meter

    Voltage Display

    3.5-digit LED display.


     selectable for ±10 V or ±40 V full-scale


    • 10 V Range: 0.01 V
    • 40 V Range: 0.1 V
  • Mechanical

    H x W x D

    108 x 223 x 370 mm (4.25 x 8.75 x 14.5 in)


    3.6 kg (8 lb)

  • Electrical

    AC Line Cord Receptacle

    Standard three-prong line cord with integral fuse holder

    Line Supply

    90 to 127 VAC at 48 to 63 Hz  180 to 250 VAC at 48 to 63 Hz option available)

  • Typical Applications

    • Contact potential (surface work function) determination
    • Materials evaluation
    • Electret studies

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 325 Accessories

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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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