Trek 542A User Manual

Trek Model 542A Non-Contacting

Electrostatic Voltmeter for EOS/ESD

The Trek Model 542A Electrostatic Voltmeter (pictured at left

with the Model 542P-S probe) provides accurate non­contacting 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
Model 542A-2: ±20 kV DC or peak AC

!

Measurement Accuracy -

Better than ±5% of the reading ±0.2% of full scale over a probe-to­surface separation of

Model 542A-1: 15 mm to 30 mm
Model 542A-2: 30 mm to 60 mm

Alphanumeric LCD Display: 20 x 4 characters

!

Typical Applications Include

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

Walking Test Adapter

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.

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 • [e-mail]

Model 542A Specifications

Performance

Measurement Ranges

Model 542A-1

0 to ±10 kV DC or peak AC

Model 542A-2

0 to ±20 kV DC or peak AC

Speed of Response (10%
to 90%)

Less than 50 ms for a ±1 kV step

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

Model 542A-2

30 mm to 60 mm
Drift with Time

Less than ±1% full scale, non-cumulative

Monitor Output

Model 542A-1

1/1000th of the measured voltage

Model 542A-2

1/2000th 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 LED illuminated at threshold

Audible

Programmable pulsating or continuous
tone. (+) and (-) alarms have different tone
rates for the pulsating tone selection

Alarm Relay Output

Form C relay contact rated at 175 V
maximum, 5 W

Alarm Digital Output

TTL output with a TTL low as the alarm
“ON” status

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
measured 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 RS­232 serial port or the USB Type B port
(connectors for each are on the back
panel)

Features (cont.)

Current Output

Provides a current of 4 mA to 20 mA
representing -10 kV to +10 kV (542A-1) and

-20 kV to +20 kV (542A-2)

Menu ↑↓Buttons

Used to 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 x8” 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.
Positive polarity connected to the center
contact

Power ON/OFF

Rear panel switch

Supplied Accessories

Operator’s Manual

PN: 24004 (with PN 45833 software CD)

6P/4C Plug

PN: N9056
Serial Cable

PN: BA108

Ground Cord

PN: N9044

Optional Accessories

AC/DC Adapter

PN: F5054R

Walking Test Adapter

CN: 1K040

Probes**

45º Orientation

Model No: 542P-45D. Aperture 3.8 mm (0.15”)
diameter. Dimensions 11 mm dia x 79 mm L
(0.43” dia. x 3.1” L)

Side Orientation

Model No: 542P-S. Aperture 4 mm (0.156”)
diameter. Dimensions 13 mm dia x 75 mm L
(0.51” dia x 3” L)

Probe Cable Length

5 meters (16 ft.) nominal

Probe Aperture

Probe Aperture

11 mm

13 mm

79 mm

9.7 mm

75 mm

9.7 mm

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

Measurement and Power Solutions

**Vacuum application probes are also available
Copyright ã 2013 TREK, INC. All specifications are subject to change. 1339/JRB

TM