This non-contacting electrostatic voltmeter provides precision and value for surface voltage measurements in the range of ±3 kV DC or peak AC. Model 347 utilizes a field-nulling technique for non-contacting voltage measurement that achieves DC stability and high accuracy, with no need for fixed probe-to-surface spacing. This permits the accurate measuring of stationary or moving surfaces. Patented probe design enhances noise and drift performance in the presence of contaminating particulate or under conditions of high humidity and/or wide temperature ranges. Key Specifications • Measurement Range: 0 to ±3 kV DC or peak AC • Measurement Accuracy: Better than 0.05% of full scale (monitor) • Speed of Response: Less than 3 ms for a 1 kV step (10% to 90%) Typical Applications Include • Surface voltage measurements of photoconductors or dielectric surfaces • Charge monitoring in semiconductor production • Measuring of electrostatic potentials on film, polymers, and paper • Superb noise and drift performance • Precision voltage monitor output • 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 • Digital Enable allows an external device to turn the internal HV power supply on/off • Well-suited for automated or computer-controlled systems • Easy-to-read LED display • Large selection of optional probes offer versatility (order separately) • Can be operated on a bench top, or with optional hardware, in a standard 19-inch rack . NIST-traceable Certificate of Calibration provided with each unit . compliant Available Probes Standard Resolution End-viewing, round body Side-viewing, round body End-viewing, square body Side viewing, square body End-viewing, round body Side-viewing, round body End-viewing, square body Side-viewing, square body Miniature PN 555P-4: End-viewing, square body PN 555P-1: Side-viewing, square body High Temperature (up to 100°C) PN 6300-7: End-viewing, square body PN 6300-8: Side-viewing, square body TREK, INC. • 190 Walnut Street • Lockport, NY 14094 • USA • 800-FOR TREK 716-438-7555 • 716-201-1804 (fax) • www.trekinc.com • sal

Performance Measurement Range Measurement Accuracy Voltage Monitor Output Voltage Display Speed of Response (10% to 90%) 0 to ±3 kV DC or peak AC Better than ±0.05% Better than ±0.1% of full scale, referred to the voltage monitor Less than 3 ms for 1 kV step Stability Drift with Time Less than 100 ppm/hour, noncumulative Drift with Temperature Less than 100 ppm/°C Voltage Monitor Output A buffered output provides a low-voltage replica of the measured voltage Ratio 1/100th of the measured voltage (Other scale factors available) Output Noise Less than 2 mV rms* Output Impedance Less...