Electrostatic Voltmeter Instruments

Model 430

Model 430 DC Stable Electrostatic Voltmeter

The Trek Model 430 Electrostatic Voltmeter represents the next generation of DC-stable noncontacting, precision surface voltage measuring instruments which incorporates the exclusive Trek vibrating electrode probe sensor.

Excellent step response characteristic eliminates measurement jitter, maintains signal integrity and provides a consistent flat and stable measurement with low noise characteristics.

Trek's patented probe design significantly improves noise and drift performance, both in the presence of contaminating particulates and under conditions of high humidity and wide temperature ranges.

A rear panel USB Connector allows data transfer to a computer with a sampling rate of either 1 ms or 10 us between data points (stream data or block data transfer protocols). PC software records and graphs the unit's output.

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.

A front panel potentiometer adjusts for zero allowing the capability to provide up to ±10 volts zero level correction.

The Model 430 is designed for bench top operation.

PERFORMANCE

All specifications are with a 430P-E probe at a probe-to-surface separation of
1 mm unless otherwise specified.

Measurement Range
0 to ±2 kV DC or peak AC.

Measurement Accuracy at the Voltage Monitor
Better than ±0.05% of full scale.
Measurement Accuracy at the Voltage Display
Better than ±0.1% of full scale ±1 count, referred to the voltage monitor.
Note: The measurement accuracy degrades to the larger of ±1.2% or 36 V in the presence of line transients or RF fields up to 3 V/m.

Speed of Response (10% to 90%)
Less than 50 us for a 1 kV step.

Stability
Drift with Time
Less than 300 mV/hour, noncumulative.
Drift with Temperature
Less than 200 mV/°C.

PRODUCT FEATURES

• USB Connector
  Allows data transfer to a computer with a sampling rate of 1 ms or 10 us between data points (stream data or block data transfer protocols). PC software records and graphs the unit's output.

• Digital Enable
  A TTL compatible input to enable or disable the measurement. A TTL high will disable the measurement, while a TTL low will enable the measurement.
• Zero Control
  A front panel potentiometer provides up to ±10 volts zero level correction when the probe is coupled to a known zero volt surface.

  Voltage Display
  3½ character, 7-segment LED display.
  Range
  0 to ±2000 V.
  Resolution
  1 V.
  Zero Offset
  ±1 count, referred to the voltage
  monitor.
  Sampling Rate
  2.5 readings per second.

• Voltage Monitor Output
  A buffered output providing a low-voltage replica of the measured voltage.
  Scale Factor
  1 V/200 V.
  Offset Voltage
  Less than 5 mV.
  Output Noise
  Less than 10 mV rms (measured with the true rms feature of the Hewlett Packard Model 34401A digital multimeter).
  Output Current Limit
  ±10 mA.
  Output Impedance
  Less than 0.1 ohms.

PROBE

Probe-to-Surface Separation
2 mm ±1 mm.

Model 430P-E Probe
Body Shape
Square.
Aperture Size
2.35 mm diameter.
Aperture Location
End.
Dimensions
6.4 mm sq. x 76 mm L.

Probe Cable Length
3048 mm ±76 mm (10 ft. ±3 in.)

ACCESSORIES

• Accessories Supplied
  • Operator's manual, AC/DC Universal Power Cube,
    PC software, and ground cord. (Probes are sold separately)

GENERAL

• Dimensions
  102 mm H x 203 mm W x 356 mm D
  (4" H x 8" W x 14" D).

  Weight
  1.6 kg (3.5 lb).

  Digital Enable
  BNC connector.

  Voltage Monitor Output Connector
  BNC connector.
  
  USB Port
  Type B port.

• Ground Receptacle
  Binding post.
• ower Requirements
  Available for all nominal line voltages. The wall cube provides the following input power to the ESVM:
  Voltage
  24 V DC, ±5% @ 1 Amp.
  Input Connector
  2.1 mm DC power plug.

  Operating Conditions
  Temperature
  0 °C to 40 °C.
  Relative Humidity
  To 85%, noncondensing.
  Altitude
  To 2000 meters