The model 257D is a portable, battery-operated fieldmeter for performing static surveys or for use as a diagnostic tool when troubleshooting problems caused by static buildup.
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Two switch-selectable measurement ranges (2 kV/cm and 20 kV/cm)
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Recorder output to pass measurements to auxiliary instruments to display or record the data
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Intrinsically safe sensors are approved for use in hazardous locations when used with approved IS barriers
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Remote sensors can be located up to 1000 feet from the monitor
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Chopper-stabilized measurement technique is drift free, even in ionized environments
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An AC adaptor is provided to recharge the batteries and to operate the Model 257D during longer-term tests]