325 ADVANCEDENERGY | Alldatasheet
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©2021 Advanced Energy Industries, Inc. The Trek® 325 electrostatic voltmeter is a versatile instrument used for performing noncontacting electrostatic voltage measurements in applications which include contact potential (surface work function) determination, materials evaluation and electret studies. The Trek 325 was specifically designed for high sensitivity applications to allow highly accurate, low noise, non-contacting measurement of electrostatic voltages of 0 to ±40 V over a wide range of probe-to-surface distances. Special features of the Trek 325 allow adjusting the performance of the unit to compensate for specific test conditions. A calibrated null voltage supply of 0 to ±10 volts nulls measured surface contact potential when measuring voltages on test surfaces. PRODUCT HIGHLIGHTS Response speed control adjusts the speed/noise trade-off of the AC response Drift/spacing null adjustment minimizes the variation in zero offset voltage as the probe-to-test surface spacing changes Dual range front panel 3.5 digit LED display resolves ±10 mV Monitor the detected output voltage through a 1:1 voltage monitor output and/or a 10:1 voltage monitor output 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 Bench top operable or, with optional hardware, in a half 9½ in or standard 19 in rack NIST-traceable Certificate of Calibration provided with each unit Measurement Range 0 to ±40 VDC or peak AC Sensitivity 1 mV Noise Less than 1 mV rms, referenced to measured voltage High Speed of Response Less Than 3 ms for a 10 V step Voltage Monitor Accuracy Better than 0.05% of full scale Null Voltage Source 0 to ±10 V calibrated supply Drift Spacing/Null Adjustment Minimizes variations in voltage values as probe-to-test surface spacing changes AT A GLANCE TREK 325 Highly sensitive versatile instrument for highly accurate, low noise, and non-contacting measurement of electrostatic votages of 0 to ±40 V.
2 advancedenergy.com TREK ELECTROSTATIC VOLTMETER 325 TECHNICAL DATA Performance Specifications Measurement Range 0 to ±40 VDC or peak AC Sensitivity 1 mV Accuracy Voltage Monitor Output Better than ±0.05% of full scale Voltage Display Better than or equal to ±2 counts, referred to the voltage monitor Speed of Response (10 to 90%) At Fastest Speed Setting Less than 3 ms for a 10 V step At Slowest Speed Setting Less than 5 ms for a 10 V step Noise Less than 1 mV rms, referenced to measured voltage. (typical) Stability Drift with Time Less than 50 ppm/hour, noncumulative Drift with Temperature 1:1 monitor output Less than 50 ppm/°C 10:1 monitor output Less than 100 ppm/°C Mechanical Specifications Dimensions (H x W x D) 108 x 223 x 370 mm (4.25 x 8.75 x 14.5 in) Weight 3.6 kg (8 lb) Voltage Monitor Connector BNC connector Ground Receptacle Banana jack AC Line Cord Receptacle Standard three-prong line cord with integral fuse holder
Features
Null Voltage Source A calibrated 10-turn dial representing a 0 to ±10 volt supply with switch selectable polarity, is used to produce zero volts output when the probe is coupled to a known zero volt surface. It is also used to null contact potentials on measured surfaces relative to the probe's gold sensitive reference electrode. Range ±10 volts Accuracy 1% Resolution 10 mV Drift/Spacing Null Adjustment This back panel adjustment minimizes the variation in monitored voltage values as the probe-to-test surface spacing changes. Voltage Display 3½ digit LED display. Range Switch selectable for ±10 V or ±40 V full scale Resolution 10 V Range: 0.01 V 100 V Range: 0.1 V Zero Offset ±2 counts, referred to the voltage monitor Sampling Rate 3 readings per second Voltage Monitor Output (1:1) A buffered 0 to ±40 V output providing a replica of the measured voltage Scale Factor 1:1 of the measured voltage Output Noise Less than 1 mV rms (measured using the true rms feature of the Hewelett Packard Model 34401A digital multimeter) Output Current 5 mA Output Impedance 100 W, nominal Voltage Monitor Output A buffered 0 to ±4 V output providing a replica of the measured voltage. Scale Factors 10:1 of the measured voltage or 20:1 of the measured voltage (switch selectable) Output Current 5 mA. Output Impedance 0.1 W, nominal. All specifications are with a Trek PD1216P probe with a probe-to-surface separation of 0.4 mm.
advancedenergy.com 3 TREK ELECTROSTATIC VOLTMETER 325 Trek 325 Electrostatic Voltmeter 325-L Trek 325-L (90 to 127 VAC) 325-H Trek 325-H (180 to 250 VAC) Probes PD1216P Trek PD1216P High-Sensitivity Probe REFERENCE NUMBERS Probe During operation, the metallic surfaces of the probe are driven to voltage levels equal to the measured surface voltage value, therefore, the probe holding fixture must be of an insulating material of 7 11 approximately 10 to 10 ohms/square. Phenolic or other dissipative type material is recommended to avoid any fixture charge retention. Probe-to-Surface Separation 0.2 mm to 2 mm (recommended) Trek PD1216P Sensor Probe Aperture Orientation 10:1 of the measured voltage or 20:1 of the measured voltage (switch selectable) Aperture Size 5 mA. Probe Body Type 0.1 W, nominal. Dimensions (D x L) 10 x 56 mm (0.4 x 2 in). Probe Cable Length 2743 ±127 mm (9 ft ±5 in). TECHNICAL DATA
For international contact information, visit advancedenergy .com. sales.support@aei.com +1.970.221.0108 ABOUT ADVANCED ENERGY Advanced Energy (AE) has devoted more than three decades to perfecting power for its global customers. AE designs and manufactures highly engineered, precision power conversion, measurement and control solutions for mission-critical applications and processes. AE’s power solutions enable customer innovation in complex semiconductor and industrial thin film plasma manufacturing processes, demanding high and low voltage applications, and temperature-critical thermal processes. With deep applications know-how and responsive service and support across the globe, AE builds collaborative partnerships to meet rapid technological developments, propel growth for its customers and power the future of technology. Specifications are subject to change without notice. Not responsible for errors or omissions. ©2021 Advanced Energy Industries, Inc. All rights reserved. Advanced Energy®, Trek®, and AE® are U.S. trademarks of Advanced Energy Industries, Inc. ENG-ESVM-Trek-325-235-01 3.21