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
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
Copyright ã 2013 TREK, INC. All specifications are subject to change. 1340/JRB
TM
5.6 mm
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