The Trek Model 370TR is a precision electrostatic voltmeter with the unique capability of making noncontacting surface voltage measurements in the range of 0 to ±3 kV DC or peak AC. • Automatic gain control eliminates manual adjustment • One step, push-button zeroing • Precision voltage monitor output • Remote ON/OFF operation capability • Optional data acquisition module • C€ compliant Model 370TRDC-Stable Electrostatic Voltmeter • High speed of response: Less than 200 |js for a 1 kV step • Transparent probe enables simultaneous radiation and measurement of surfaces • Measurement range: 0 to ±3 kV DC or peak AC • Measurement accuracy: Better than 0.05% of full scale The 370TR employs an electrostatic field-nulling technique which achieves high DC stability and high measurement accuracy even if the probe to measured surface spacing changes. This permits measurements of either stationary or moving surfaces without the need to establish fixed spacing to maintain accuracy. The Model 3629A Transparent probe permits light to pass through the probe to provide simultaneous radiation and measurement of a surface. This is useful for photosensitive surface studies such as ‘time of flight’ measurements of photoconductor surfaces. A Digital Enable connection permits remote ON/OFF measurement capability. An automatic gain control feature of the 370TR eliminates the need for manual adjustment when changing probes or when changing the probe to measured surface separation. The 370TR also features one-step, push-button zeroing. When the ZERO button on the front panel is pressed, the 370TR automatically adjusts the output to zero volts when the probe is coupled to a known zero volt surface. A precision voltage monitor provides a low-voltage replica of the measured electrostatic voltage for external monitoring purposes, or for use as a feedback signal in a closed-loop system. An optional data acquisition module is available, featuring an IEEE-488 compatible interface, 14-bit resolution, 12-bit accuracy, and a programmable sampling period from 10 ms to 30 minutes.

All specifications are with a 3627 or 3629A probe at a probe-to-surface separation of 2 mm unless otherwise noted. Features (cont.)General (cont.) Sampling Rate 2.5 readings per Measurement Range 0 to ±3 kV DC or peak AC. Measurement Accuracy At the Voltage Monitor Better than ±0.05% of full scale. At the Voltage Display Better than ±0.1% of full scale ±1 count, referred to the voltage monitor. Speed of Response (10% to 90%) Less than 200 ms for a 1 kV step. Stability Drift with Time Less than 150 ppm/hour, noncumulative. Drift with Temperature Less than 100 ppm/°C. Zero Control A momentary...