The Trek Model 323 Electrostatic Voltmeter performs highly sensitive voltage measurements using a variety of Trek side view probes with various body types (round, square).
The Model 323 is a versatile instrument used for a variety of electrostatic applications including materials evaluation, electret studies, charge accumulation on disk drive assemblies, and other extremely sensitive ESD sensitive components.
The Model 323 is specifically designed for high sensitivity applications and performs highly accurate, noncontacting measurement of electrostatic potentials of 0 to 100 V over a wide range of probe-to-surface distances.
The Model 323 has adjustments to compensate for many sensitive testing conditions. The response Speed control adjusts the speed/noise tradeoff of the AC response. The Drift/Spacing Null Adjustment minimizes the variation in zero offset voltage as the probe to test surface spacing changes.
The front panel has an easy to read 3½ digit LED display. The detected output voltage can be monitored through a 1:1 voltage monitor output and a switch selectable scale of 10:1 or 20:1 voltage monitor output.
Trek patented low impedance probes assure measurement accuracy essentially independent of probe-to-test-surface spacing, humidity conditions, and contamination such as airborne dust, toner, ions and chemicals.
The Model 323 meets the requirements described for an electrostatic monitor under the Environmental Protection Agency (EPA); Title 40 Part 86 – Control of Emissions from New and In-Use Highway Vehicles and Engines. Specifically 40 C.F.R. 86.1312-2007 - Filter stabilization and microbalance workstation environmental conditions, microbalance specifications, and particulate matter filter handling and weighing procedures.
This EPA regulation for emission control describes the procedure for measuring particulates from vehicle emissions that are accumulated on a filter for weighing. During the weighing process static neutralizers such as Po-210 sources are used to neutralize any charge build up on the filter that could interfere with the filter weighing. To insure the Po-210 sources (or other static neutralizers) are operating properly a static monitor is used to measure residual charge on the filter before weighing. Static charge on the filter needs to be less than ±2V DC which requires the use of a static measuring device having sufficient low voltage resolution, low zero offset, and good sensitivity. The Model 323 with 0.01V of resolution and 5mV of sensitivity meets these requirements to insure accurate and repeatable measurements required by EPA regulation 40 C.F.R. 86.1312-2007.
All specifications are with a Model 6000B-8 probe with a probe-to-surface separation of 1 mm.
Speed of Response (10% to 90%)
Standard Resolution Probes:
Null Voltage Source
Response Speed Control
Drift/Spacing Null Adjustment
Voltage Monitor Output (1:1 ratio)
Voltage Monitor Output (10:1 or 20:1 ratio)
AC Line Cord Receptacle
Voltage Monitor Connector
TREK, INC. certifies that each Model 323 is tested and calibrated to specifications using measurement equipment traceable to the National Institute of Standards and Technology or traceable to consensus standards. A Certificate of Calibration accompanies each instrument when it is shipped from the factory.
All specifications are subject to change.