Monroe Electronics Electrostatic Fieldmeter - Portable - model 257D - Manual (Page 4)

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Section 2
GENERAL INFORMATION
The Model 257D Portable Electrostatic Fieldmeter measures electrostatic field (potential
gradient) in kilovolts per centimeter. Using the probe-to-surface separation as a
calibration factor, it may also be used to measure surface voltage.
The instrument utilizes all solid-state components including modern integrated and
hybrid circuits.
It may be operated from its internal re-chargeable battery system or optionally from AC
power lines. All essential operating controls are located on the instrument’s front panel.
A rear panel-mounted BNC connector provides an analog output for monitoring. A
standard banana jack and mating cable with clip is provided for grounding purposes.
The carrying case has storage space for the probe, manual and accessories.
Applications:
One major application of the Model 257D is the monitoring of electrostatic charge
accumulation. As charge increases on the surface of a material, the electrostatic field in
the vicinity also increases proportionately. Thus the Model 257D reliably provides an
output signal proportional to the surface charge accumulation while making NO
PHYSICAL CONTACT to the material being monitored.
Other applications include:
 Monitoring the effectiveness of static elimination equipment
 Atmospheric electricity measurements.
 High voltage DC transmission terminal measurements
 Monitoring of coating, capping or filling processes