Trek Model 542A Non-Contacting Electrostatic Voltmeter for EQS/ESD The Trek Model 542A Electrostatic Voltmeter (pictured at left with the Model 542P-S probe) provides accurate non-contacting measurements of the electrostatic surface voltage associated with EOS/ESD processes. The instrument is configured with a miniature electrostatic field chopper probe that can be remotely located and easily positioned within process equipment to provide highly accurate, non-contacting, DC-stable, spacing-independent voltage measurements in either ionized or non-ionized environments. A 20x4 alphanumeric LCD screen displays the present measured voltage, the positive peak voltage value, the negative peak voltage value and additional menu information. Key Specifications • Measurement Range Model 542A-1: ±10 kV DC or peak AC Optional walking test adapter kit [CN 1K040] for the Model 542A allows analysis of charge levels on the human body in support of EN 1815, Assessment of Static Electrical Propensity on Resilient and Textile Floor Coverings. • Measurement Accuracy Better than ±5% of the reading ±0.2% of full scale over a probe-to-surface separation of Model 542A-1: 15 mm to 30 mm • Alphanumeric LCD Display: 20 x 4 characters Typical Applications Include • Semiconductor • LCD • Electronic assembly • ESD-sensitive processes Features and Benefits • Chopper probe is DC-stable with or without incident air flow • Drift-free measurements • LCD screen displays present voltage and holds the most positive and negative values • Visual and audible alarms activate when the preset voltage threshold levels are reached • Analog voltage monitor output • USB and RS-232 serial ports • NIST-traceable Certificate of Calibration provided with each unit • compliant • Optional Walking Test Adapter kit available TREK, INC. • 190 Walnut Street • Lockport, NY 14094 • USA • 800-FOR TREK 716-438-7555 • 716-201-1804 (fax) • www.trekinc.com •

Performance Measurement Ranges Model 542A-1 Model 542A-2 Speed of Response (10% to 90%) Accuracy 0 to ±10 kV DC or peak AC 0 to ±20 kV DC or peak AC Less than 50 ms for a ±1 kV step Better than ±5% of the reading ±0.2% of full scale over a probe-to-surface separation of: 15 mm to 30 mm 30 mm to 60 mm Drift with Time Less than ±1% full scale, non-cumulative Monitor Output Model 542A-1 Model 542A-2 Output Noise Output Impedance 1/1000th of the measured voltage 1/2000th of the measured voltage Less than 30 mV rms* 47 W Features Activated if measured voltage exceeds preset threshold limits; positive/negative limits...