The Trek Model P0865 is a DC stable, precision electrostatic voltmeter for making noncontacting surface voltage measurements in the range of 0 to ±10 kV DC or peak AC. Research and industrial applications include charge accumulation monitoring of the LCD production processes, monitoring surface potentials in the electrostatic painting process, research and development in the electrophotographic process, and measuring electrostatic potentials on polymers, rubber, fabrics, and paper. The Model P0865 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 P0865 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 3450 probe assembly includes a sensitive electrode and preamplifier, which is driven to the same potential as the measured value to eliminate arcing there between. A three (3) meter cable permits remote probe positioning. The Model P0865 can be operated on a bench top or, with optional hardware, in a standard 19-inch rack.
Model P0865 Specif Model 10/40A Spec
All specifications are with a Model 3450 probe at a probe-to-surface separation of 3 mm, ±1 mm.
Performance
Measurement Range 0 to ±10 kV DC or peak AC
Accuracy Better than ±0.1% of full scale (as referred to the voltage monitor).
Speed of Response (10% to 90%) Less than 200 ms for a 1 kV step change. Less than 5 ms for a 20 kV step change.
Full Signal Bandwidth DC to better than 50 Hz.
Stability
Drift with Time Less than 100 ppm/hour,noncumulative.
Drift with Temperature Less than 200 ppm/°C.
Features
High-Voltage Ready LED A LED indicator illuminates when the Model P0865 is ready to make high-voltage measurements.
High Voltage On/Off A two-position toggle switch that turns on and off the high-voltage power supply inside the instrument.
Zero Adjust A 10-turn control to null offsets or other zero errors which occur within the system.
Voltage Monitor Output A BNC output provides a low-voltage replica of the measured voltage.
Scale Factor 1/1000th of the measured voltage.
Output Noise Less than 20 mV rms (measured using the true rms feature of the Hewlett Packard Model 34401A digital multimeter).
Output Impedance Less than 0.1 Ω.
Voltage Display 4½ digit LED display.
Range 0 to ±10,000 V.
Resolution 1 V.
Zero Offset Less than ±2 counts, referred to the voltage monitor.
Sampling Rate 3 readings per second.
Power On/Off A two-position rocker switch that turns on and off the main power.
General Dimensions 134 mm H x 432 mm W x 432 mm D (5.25² H x 17² W x 17²D).
Weight 15 kg (33 lb).
Voltage Monitor Connector BNC connector.
Ground Receptacle Green binding post.
AC Line Cord Receptacle Standard three-prong line cord receptacle with an integral fuse holder.
Line Supply Factory set for one of three nominal AC line voltages: 100 V, 115 V, or 230 V AC [CE compliant], at 48 to 63 Hz (specify when ordering).
Operating Conditions
Temperature 0 °C to 40 °C.
Relative Humidity To 90%, noncondensing.
High Voltage On/Off Probe-to-Surface Separation 3 mm ±1 mm (recommended).
