Trek 541A User Manual

Trek Model 541A Non-Contacting

Electrostatic Voltmeter for EOS/ESD

The Trek Model 541A Electrostatic Voltmeter (pictured at left with

the Model 541PR-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, the negative peak voltage and additional menu information.

Key Specifications

Measurement Range

Model 541A-1: ±1 kV DC or peak AC

Model 541A-2: ±100 V DC or peak AC

Measurement Accuracy: Better than ±1% of full scale over a

probe-to-surface separation of

2.5 mm ± 1mm

Alphanumeric LCD Display: 20 x 4 characters

Walking Test Adapter

Typical Applications Include

! Semiconductor ! LCD ! Electronic assembly ! ESD-sensitive processes

Optional Walking Test Adapter kits for the Model 541A allow analys i s o f c h a rge leve l s accumulated on the human body per compliance with ANSI/ESD STM97.2. and IEC Standard 61340-4-5. See page 2 for details.

Features and Benefits

! Chopper probe is DC-stable with or without incident air ion 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 ! Voltage output monitor for remote monitoring or control ! USB and RS-232 serial ports ! NIST-traceable Certificate of Calibration provided with each unit ! compliant ! Optional Walking Test Adapter kits available

TREK, INC. • 190 Walnut Street • Lockport, NY 14094 • USA • 800-FOR TREK

716-438-7555 • 716-201-1804 (fax) • www.trekinc.com • sales@trekinc.com

Model 541A Specifications

Performance

Measurement Ranges

Model 541A-1

0 to ±1 kV DC or peak AC

Model 541A-2

0 to ±100 V DC or peak AC

Speed of Response (10% to 90%)

Less than 50 ms for a ±1 kV step (541A-1)

Less than 50 ms for a ±100 V step (541A-2) Accuracy

1% of full scale

Resolution

0.1%

Monitor Output

Model 541A-1

1/100th of the measured voltage

Model 541A-2

1/10th of the measured voltage

Output Noise

Less than 30 mV rms*

Output Impedance

47 W

Features

Alarms

Activated if measured voltage exceeds preset threshold limits; positive/negative limits may be programmed separately

Visual

Front-panel LEDs illuminate when thresholds are reached

Audible

ON/OFF programmable pulsating or continuous tone. (+) and (-) alarms have different tone rates for the pulsating tone selection

Alarm Relay Output

Form C relay contact with barrier strip terminals; changes state when voltage thresholds are met or exceeded

Alarm Digital Output

TTL output with a TTL low (0 to 0.8 V) as the alarm “ON” status; TTL high (2.5 to 5.0 V) indicates a normal condition

Reset Button

Resets alarms and peak hold to zero

Zero Control

Adjustable to produce zero volts when probe coupled to a known zero voltage source

Alphanumeric LCD Display

20 character by four line (20x4) LCD displays the present voltage and holds the most positive and most negative values

Ground Receptacle

Banana jack

Serial Port and USB Port

Provides control of specific functions and acquires sensor data utilizing Trek software and a PC connected to the RS-232 serial port or the USB Type B port (connectors are on back panel)

Current Output

Provides a current of 4 mA to 20 mA representing -1 kV to +1 kV (541A-1) and

-100 V to +100 V (541A-2)

Features (cont.)

Menu ↑↓Buttons

Select and program menu options - the set the alarm threshold voltages, alarm conditions and alarm reset type

↑↓

Mechanical

Dimensions

97 mm H x 152 mm W x 204 mm D (3.8” H x 6” W x 8” D)

Weight

0.77 kg (1.7 lb.)

Operating Conditions

Temperature

15°C to 35°C (59°F to 95°F)

Relative Humidity

5% to 85% RH, non-condensing

Altitude

To 2000 m (6561.68 ft.)

Electrical

Power

15 V DC ±20%, 800 mA, power bus or AC/DC adapter with a 2.1 mm DC plug.

Power ON/OFF

Rear panel switch

Supplied Accessories

PN: 24005 Operator Manual (with software CD), PN: N9056 6P/4C Plug, PN: BA108 Serial Cable, PN: N9044 Ground Cord

Optional Accessories

AC/DC Adapter PN: F5054R

Walking Test Adapter - Round Body Probe CN: 1K037

Walking Test Adapter - Square Body Probe CN: 1K038

Probes

Probe

Miniature electrostatic field chopper probe

End-view orientation (round body)

Model No: 541PR-E. Aperture 1.6 mm (0.06”) diameter. Dimensions 9.7 mm dia x 50 mm L (0.38” dia. x 2” L)

Side-view orientation (round body)

Model No: 541PR-S. Aperture 2.3 mm (0.09”) diameter. Dimensions 9.7 mm dia x 53 mm L (0.38” dia x 2.1” L)

Side-view orientation (square body)

Model 541P-S. Aperture 2.5 mm (0.1”) diameter. Dimensions 5.6 mm sq x 50 mm L (0.22” sq x 2” L)

Probe Cable Length

3 meters nominal(9.8 ft.)

Probe-to-Surface Separation Distance

2.5 mm ±1 mm (recommended)

End View Probe Aperture

1.6 mm

50 mm

Side View Probe Aperture

2.3 mm

50 mm

*Measured using the true rms feature of the HP Model 34401A digital multimeter

Measurement and Power Solutions

Side View Probe Aperture

2.5 mm

5.6 mm