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344 DC-Stable ESVM


Catalog excerpts

344	DC-Stable ESVM - 1

• Speed of Response: Less than 3 ms for a 1 kV step • Low noise and drift performance • A variety of probes are available for different installation requirements • Precision voltage monitor output • Easy-to-read LED display Model 344DC-Stable Electrostatic Voltmeter • Measurement Range: 0 to ±2 kV DC or peak AC • Accuracy: Better than 0.05% of full scale The Trek Model 344 is a precision electrostatic voltmeter for making noncontacting surface voltage measurements in the range of 0 to ±2 kV DC or peak AC. The Model 344 employs a field-nulling technique for noncontacting voltage measurement that achieves DC stability and high accuracy even if the probe-to-surface spacing changes. This permits measurements of either stationary or moving surfaces without the need to establish fixed spacing to maintain accuracy. The Model 344 patented probe design eliminates the need for close tolerance components. This significantly improves noise and drift performance, both in the presence of contaminating particulates and under conditions of high humidity and wide temperature ranges. A precision voltage monitor provides a low-voltage replica of the measured electrostatic potential for monitoring purposes, or for use as a feedback signal in a closed-loop system. The Model 344 can be operated on a bench top or, with optional hardware, in a standard 19-inch rack. The rack adapter allows two 344 units to be mounted together. The Digital Enable feature provides a connection for a remote device to turn on and off the high voltage of the instrument. This makes the 344 suitable for automated or computer-controlled systems. The Model 344 is designed to be operated on a bench top.

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344	DC-Stable ESVM - 2

Model 10/40A Specifications Model 344 Specifications All specifications are with a 6000B-8 probe at a probe-to-surface separation of 2 mm. Performance Measurement Range 0 to ±2 kV DC or peak AC. Accuracy Voltage Monitor Better than ±0.05% of full scale. Voltage Display Better than ±0.1% of full scale, referred to the voltage monitor. Speed of Response (10% to 90%) Less than 3 ms for a 1 kV step change. Stability Drift with Time Less than 100 ppm/hour, noncumulative. Drift with Temperature Less than 100 ppm/°C. General Line Supply 100, 115, or 230 V AC ±10%, 50-60 Hz (specify when ordering)....

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