Trek 341B User Manual

Trek Model 341B

High-Speed, High-Voltage Electrostatic Voltmeter

The Trek Model 341B is a DC-stable, precision electrostatic
voltmeter for making noncontacting surface voltage
measurements. The 341B employs a field-nulling technique that
achieves DC stability and high accuracy even if the probe-to­surface spacing changes. This permits measurements of either
stationary or moving surfaces without the need to establish fixed
spacing to maintain accuracy. The instrument also utilizes a
patented probe design that eliminates the need for close tolerance
components which significantly improves noise and drift under
conditions of high humidity and wide temperature ranges.

Key Specifications

! Measurement Range: 0 to ±20 kV DC or peak AC

! Measurement Accuracy: Better than ±0.1% of full scale
! Speed of Response: Less than 200 µs for a 1 kV step

Typical Applications Include

! Charge accumultion monitoring of LCD production processes
! Monitoring surface potentials in the electrostatic painting process
! Measuring of electrostatic potentials on polymers, rubber, fabrics and paper

Features and Benefits

Superb noise and drift performance

!

Precision voltage monitor output

!

Monitor provides a low voltage replica of the measured electrostatic potential for

!

monitoring purposes or for use as a feedback signal in a closed loop system
Easy-to-read LED display

!

Optional probes offer versatility (order separately)

!

Can be operated on a bench top, or with optional hardware, in a standard 19-inch rack

!

NIST-traceable Certificate of Calibration provided with each unit

!

compliant

!

Available Probes Available Configurations

Standard Resolution Model 341B

PN 17157: Model 3450 Side-viewing PN 341B-L, 341B Electrostatic Voltmeter (90-127 V AC)

PN 341B-H, 341B Electrostatic Voltmeter (180-250 V AC)

High Temperature (up to 100°C) Model 341B-1 (for use with 3460-1 Line Driver)
PN 17284 Model 3455ET End-viewing PN 341B-1-L, 341B-1 Electrostatic Voltmeter (90 to 127 V AC)
PN 17285 Model 3453ST Side viewing PN 341B-1-H, 341B-1 Electrostatic Voltmeter (180 to 250 V AC)

PN 17181, Model 3460 Line Driver (used with 341B-1)
(Model 341B-1 utilizes a separate line driver for extended probe cable lengths)

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 347 Specifications

Performance

Measurement Range

0 to ±20 kV DC or peak AC

Measurement Accuracy

Better than ±0.1% of full scale, referred to
the voltage monitor

Speed of Response
(10% to 90%)

Less than 200 µs for 1 kV step. Less than
5 ms for 20 kV step change

Full Signal Bandwidth

DC to better than 25 Hz

Stability
Drift with Time

Less than 100 ppm/hour, noncumulative
Drift with Temperature

Less than 100 ppm/˚C

Voltage Monitor

Output

A buffered output provides a low-voltage
replica of the measured voltage

Ratio

1/100th of the measured voltage

Output Noise

Less than 20 mV rms*

Output Impedance

Less than 0.1 W

Voltage Display

Voltage Display

4 ½ digit LED display

Range

0 to V±19.99 k

Resolution

1 V

Zero Offset

±2 counts, referred to the voltage monitor

Sampling Rate

3 readings per second

Features

High Voltage Ready LED

LED indicator illuminates when the Model
341B is ready to make high-voltage
measurements

High Voltage ON-OFF

Two-position toggle switch that turns on
and off the high-voltage power supply
inside the instrument

Zero Control

A 10-turn control to null offsets or other
zero errors that occur within the system

Mechanical

Dimensions

230 mm H x 441 mm W x 432 mm D
(9.06” H x 17.36” W x 17” D)

Weight

17 kg (37 lb)

Voltage Monitor
Output Connector

BNC connector
Ground Receptacle

Green binding post

Operating Conditions

Temperature

0°C to 40°C (32°F to 104°F)

Relative Humidity

To 90%, noncondensing

Altitude

To 2000 m (6561.68 ft.)

Probe-to-Surface
Separation

3 mm ±1mm (recommended)

Electrical

AC Line Cord
Receptacle

Standard 3-prong with integral fuse holder

Line Voltage

Factory set for one of two ranges: 90 to 127
V AC or 180 to 250 V AC, at 48 to 63 Hz

Power ON/OFF

Two-position rocker switch that turns ON
and OFF the main power to the instrument

Supplied Accessories

Operator’s Manual

PN: 23306

Line Cord

PN: N5002 (for 90 to 127 V AC)
PN: Determined by the geographical
destination (for 180 to 250 V AC)

Optional Accessories

Probes

Please refer to Page 1

Probe Line Driver
(required when used
with the 341B-1 and
an extended cable
length)

Model: 3460-1

Probe Extension
Cable (from the 341B
to the probe)

PN: 17218, Model 3450EC Probe Extension
Cable
Full-Rack Mount Kit

Model 603RA (19-inch)

Certification

TREK, INC. certifies that each Model 341B is tested and calibrated to
specifications using measurement equipment traceable to the
National Institute of Standards and Technology or traceable to
consensus standards.

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

Measurement and Power Solutions

Copyright ã 2012 TREK, INC. All specifications are subject to change. 1234/DEC

TM