Charged Plate Monitors


TREK Model 158 Charged-Plate Monitor

The Trek Model 158 Charged-Plate Monitor is the premier instrument to evaluate the performance of air ionization systems. 

Unique among charged-plate monitors, the Model 158 features a color graphics display to permit viewing of discharge waveforms and offset voltage in the time domain, and the ability to store test data and waveforms for hundreds of ionizer tests. 

The Model 158 is compact, portable, and stores test results internally, permitting the operator to move freely about the facility to evaluate ionizers, unencumbered by a heavy instrument, laptop computer, and collateral materials to record test results.  With a charge plate, the Model 158 is a complete ionizer audit kit.

The Model 158 can be line or battery operated. The unit ships with two battery packs. The battery pack is easily removed and replaced with a fresh pack to permit operation on the factory floor for extended periods of time. 

Test data is stored on a removable PCMCIA flash memory card. The card containing test results is easily removed from cleanroom facilities to office areas where the test results can be downloaded, evaluated, and transferred to reports. For those demanding very strict ion balance, the Model 158 resolves 0.1 V plate voltage. The Model 158 uses an innovative voltage-follower technique to provide accuracy, stability, and bandwidth that is unavailable from charged-plate monitors which employ fieldmeter-based measurement methods.  

Trek's voltage-follower technique provides virtually immeasurable loading affect of the ion collecting plate, while allowing the plate to be charged and monitored through the same, small diameter cable. The size and shape of the ion collecting plate and the plate's capacitance to ground may be optionally tailored to a particular application.

Show/Hide Product Technical Information

PERFORMANCE

  • Monitored Voltage Range
    0 to ±1100 V DC or peak AC.
  • Bandwidth (-3 dB)
    DC to 80 Hz.
  • Zero Stability (referred to plate voltage)
    • Drift with Time (no incident ion flow)
      Less than 6 V/minute.
    • Drift with Temperature
      Less than 10 mV/°C, noncumulative.
  • Decay Mode Thresholds
    • Start Voltage
      Programmable from
      1 to ±1000 V in 1 V increments.
    • Start Accuracy
      Within ±1 V of 
      programmed start voltage.
    • Stop Voltage
      Programmable from
      0 to ±999 V in 1 V increments.
    • Stop Accuracy
      Within ±1 V of
      programmed stop voltage.
  • Ion Collecting Plate Self-Discharge Rate
    Less than 12 V/minute.

GENERAL

  • Operating Conditions
    • Temperature
      5 °C to 35 °C.
    • Relative Humidity
      To 80%, noncondensing.
  • Instrument Dimensions
    57 mm H x 171 mm W x 222 mm D
    (2.25" H x 6.75" W x 8.5" D).
  • Instrument Weight
    1.3 kg (2.5 lb).
  • Voltage Monitor Connector
    BNC coaxial connector.
  • Ground Receptacle
    Binding ground post.
  • Cable from Instrument to Floating Plate Coaxial type.
    Diameter is 4.95 mm (0.195").
    Length is typically 3 meters (10 ft), nominal.

PRODUCT FEATURES

  • LCD Display  
    (with contrast adjustment)
    3.5 inch x 4.75 inch  (89 mm x 121 mm) displays graphical readouts, numeric data, informational data, programming parameters, and retrieved data. 
    • Sampling Rate
      400 k/s.
    • Analysis Resolution 
      12 bits.
  • Printer Attachment (Optional)
    A small printer attachment for the 158 unit can be used to print test data directly from the Model 158. 
  • Float Mode, (+) Decay Mode, or  (-) Decay Mode 
    Performs offset and discharge EOS/ESD measurements utilizing parameters, guidelines, and standards set by the ESD Association. 
  • For (+) Decay and (-) Decay Modes
    The charged-plate is initially charged to a voltage level just above the programmed (+) or (-) start voltage value and the decay timer is set to zero. Upon test initiation, the plate is allowed to decay toward zero due to the ion impingement on the plate. The time to reach the programmed stop voltage value is displayed on the timer.
  • For Float Mode
    The charged-plate is initially reset to zero. Upon test initiation, the plate is allowed to “float” to a voltage level dictated by ion impingement on the plate.
  • Mode Select/Programming
    Allows multiple operational and programming options. The Model 158 can be preset to perform a number of automated tests and is able to store or retrieve previously defined test parameters. Test locations and results can be saved and retrieved for future reference.
  • PC Memory Card Port
    Computer card port allows information to be saved, retrieved, and exchanged on SRAM or Flash ATA card media.
  • Voltage Monitor Output
    A BNC providing a low voltage replica of the plate voltage.
    • Scale  1/200th of the plate voltage. DC Accuracy Better than 0.1% of full scale. Offset Voltage Less than ±10 mV. Output Noise Less than 10 mV rms (measured using the true rms feature of the Hewlett Packard Model 34401A digital multimeter). Output Impedance Less than 0.1 ohm.
    • DC Accuracy
      Better than 0.1% of full scale.
    • Offset Voltage
      Less than ±10 mV.
    • Output Noise
      Less than 10 mV rms (measured using the true rms feature of the Hewlett Packard Model 34401A digital multimeter).
    • Output Impedance
      Less than 0.1 ohm.

 
  • Ion Collecting Plates (ordered separately)
    • Meets ESD Association Standard ANSI/ESD-STM3.1 requirements for:
      • Dimensions
        150 mm x 150 mm square (6" x 6" square).
        25 mm x 25 mm square (1" x 1" square).
      • Capacitance
        20 pF ±2 pF.
    • Non-standard Option
      • Dimensions
        Specify when ordering.
      • Capacitance
        Specify when ordering.
    High Temperature Ion Collecting Plates
    • Model 156P-HT 150mm x 150mm Charge Plate
      • Dimensions
        15.3 cm x 15.3 cm square, (6" x 6" square) ion collecting plate
      • Cable Length
        2.7 meters
      • Capacitance
        20 pF ±5 pF
      • Operating range
        -60° to 160°
      • Relative Humidity
        To 85%, noncondensing
    • Model PD04002AP
      • Dimensions
        25 mm x 25 mm (1" x 1") ion collecting plate
      • Cable Length
        3 meters
      • Capacitance
        20 pF ±5 pF
      • Operating Range
        -60° to 160° C
      • Relative Humidity
        To 85%, noncondensing

      Charged Plate Monitor Accessories
      DI (de-ionized) Water Probes / Low Profile Charged Plate Information (PDF)

CERTIFICATION

TREK, INC. certifies that each Model 158 is tested and calibrated to specifications using measurement equipment traceable to the National Institute of Standards and Technology or traceable to consensus standards.

Specifications are subject to change.

  • Products
  • Downloads
  • Technical Info
  • Applications
  • Sales & Support
  • News & Events
  • About Trek