Electrostatic Products

Monroe 288B

Easy-to-Use, Innovative High Voltage Electrometer for Testing Low Voltage with Unmatched Stability

Advanced Energy’s Monroe 288B is the first charged plate monitor to offer onboard data storage to automate ionization system testing. The Monroe 288B performs customary manual tests or a series of automated decay and balance tests.

  • Electrometer Dynamic Range: ±1200 V
  • Charge Plate Size: 15 x 15 cm (6 x 6 in)
  • Data Storage: 1500 Readings
  • Overview
  • Technical Specs
  • Documents
  • Service & Support
  • Distributors


The Monroe 288B is an easy-to-use, innovative high voltage electrometer that provides tests to unprecedented low voltage with unmatched stability. All test parameters are programmable, allowing tests to be optimized and not dictated by equipment limitations.

Once programmed, the Monroe 288B will perform a series of tests automatically: ± decays, balance, balance peaks, temperature, humidity, time/date are stored and may be reviewed via the display or downloaded to a PC. The included software permits the user to define and name ionizer locations, test setups, and sequences and upload them to the CPM. All of these features result in a flexible, easy-to-use instrument that facilitates audits while minimizing errors.


  • Perform manual and automated testing of decay and balance
  • Store up to 1500 tests, 500 locations, and 4 test protocols
  • Use the large, easy-to-read, high contrast LCD display
  • Configure operating parameters
  • Utilize soft keys for highly intuitive programming


  • Internal battery for portable operation
  • Detachable 6 x 6-inch plate with optional 1 x 1 in plate
  • Built-in temperature and humidity sensors
  • Auto-ranging to 0.1V resolution below 100V Meets ESD Association Standard ANSI / ESD STM 3.1

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

  • Performance


    ±1200 V


    -3db @ 1Khz 20 V p-p
    -3db @ 10Hz 2000 V p-p
    < 12 mV rms

  • Charge Plate


    20 pF ± 2 pF


    Settable to 1 V increments


    0.3% of setting ±2.5 V

  • Mechanical

    Battery Life

    Typ > 6 hours


    280 x 229 x 152 mm (11 x 9 x 6 in)


    12.5 lb (5.7 kg)

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.

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Product Support

Inside the U.S.: 1.800.446.9167 (option 2)
Outside the U.S.

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