Model 706A/1 PORTABLE Electrostatic Voltmeter

The Trek Model 706A/1 portable electrostatic voltmeter is specifically designed as a field-service tool to perform ESD noncontacting surface voltage measurements. Applications include measurement of photoreceptor surfaces in copiers and laser printers.

The Trek Model 706A/1 portable electrostatic voltmeter has a measurement range of 0 to +1 kV or 0 to -1 kV (switch selectable) and employs an easy to read 3½ digit liquid crystal display to indicate the measured electrostatic potential in volts. Accurate electrostatic measurements can be performed by holding the probe at a distance of 1 mm to 5 mm from a surface. 

Model 706A/1 employs a voltage-nulling technique that achieves DC stability and high accuracy even if the probe-to-measured surface spacing varies during use. For example, this permits measurement of rotating electrophotography drums without concern for the effects of measurement accuracy from drum run-out.

The probe design provides low noise and drift performance even in the presence of contaminating toner particles, or under conditions of high humidity and temperature. The small durable probe has a cable length of 183 cm (72"). 

The Model 706A/1 is lightweight, battery operated, and packaged in rugged enclosure that provides a place for convenient probe storage.   

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PERFORMANCE

• All specifications are with a probe-to-surface separation of 3.2 mm.

  Measurement Range 
  (switch selectable)
  0 to +1 kV or -1 kV DC.
  
  Accuracy
  Better than 0.5% of full scale.

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PRODUCT FEATURES

• Battery TEST/READ Switch
  A two-position switch. In the battery 
  TEST position, the batteries should be replaced if the digital display indicates a value lower than 1100. In the READ position, the Model 706A/1 measures surface voltage. 

  Voltage Display
  3½ digit liquid crystal display.
  Range
  0 to ±1000 V.
  Resolution
  1 V.
  Zero Offset
  Less than ±1 count.
  Sampling Rate
  3 readings per second.
  
  Polarity Switch
  A two-position toggle switch to select either the measurement range of 
  0 to +1 kV or 0 to -1 kV.

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PROBES

Probe-to-Measured Surface Distance
1 mm to 5 mm is the recommended probe-to-measured surface distance range to limit measurement errors due to extraneous voltage sources in the vicinity of the probe.

Trek Model 701P-76S Probe Dimensions
8.7 mm diameter x 70 mm L
(0.35" diameter x 2.75" L). 

Cable Length 
1830 mm (72").

Aperture Size (oval shaped)
3.18 mm W x 6.35 mm L 
(0.125" W x 0.25" L). 

Aperture Orientation  
Side viewing. 

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ACCESSORIES

• Accessories Supplied
  • Operator's manual, Two (2) 9-volt batteries

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GENERAL

• Power Requirements
  Two (2) 9-volt alkaline batteries.
  
  Operating Time
  10 hours from new batteries.
  
  Operating Conditions
  Temperature
  5 °C to 35 °C.
  Relative Humidity
  To 85%, noncondensing.
  
  Dimensions
  39 mm H x 130 mm W x 134 mm D,
  (1.6" H x 5.2" W x 5.3" L).
  
  Weight
  455 g (1 lb), with batteries.
  
  Ground Receptacle
  Green banana jack. 

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CERTIFICATION

TREK, INC. certifies that each Model 706A/1 is tested and calibrated to specifications using measurement equipment traceable to the National Institute of Standards and Technology or traceable to consensus standards. A Certificate of Calibration accompanies each instrument when it is shipped from the factory. 

NOTE: The Model 706A/1 is designed to make electrostatic voltage  measurements only! For safety, the Model 706A/1 should never be used to 
perform measurements of “hard” voltage sources or voltage sources 
which can deliver currents high enough to cause harmful shocks or personal 
injury.

All specifications are subject to change.

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