Trek 344 User Manual
Model 344
DC-Stable Electrostatic Voltmeter
! Measurement
Range:
0 to ±2 kV
DC or peak AC
!
! Accuracy:
Better than 0.05% of
full scale
!
The Trek Model 344 is a precision electrostatic voltmeter for
making noncontacting surface voltage measurements in the
range of 0 to ±2 kV DC or peak AC.
! Speed of Response:
Less than 3 ms for
The Model 344 employs a field-nulling technique for
noncontacting voltage measurement that achieves DC stability
and high accuracy even if the probe-to-surface spacing changes.
This permits measurements of either stationary or moving
surfaces without the need to establish fixed spacing to maintain
accuracy.
The Model 344 patented probe design eliminates the need for
close tolerance components. This significantly improves noise
and drift performance, both in the presence of contaminating
particulates and under conditions of high humidity and wide
temperature ranges.
A precision voltage 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.
The Model 344 can be operated on a bench top or, with optional
hardware, in a standard 19-inch rack. The rack adapter allows
two 344 units to be mounted together.
The Digital Enable feature provides a connection for a remote
device to turn on and off the high voltage of the instrument. This
makes the 344 suitable for automated or computer-controlled
systems.
a 1 kV step
!
! Low noise and
drift performance
!
! A variety of probes
are available for
different installation
requirements
!
! Precision voltage
monitor output
!
! Easy-to-read
LED display
The Model 344 is designed to be operated on a bench top.
Measurement and Power Solutions
www.trekinc.com
TM
Model 344 Specifications
All specifications are with a 6000B-8 probe at a probe-to-surface separation of 2 mm.
Model 10/40A Specifications
Performance Features Features (cont.)
Measurement Range Zero Control Voltage Display
0 to ±2 kV DC or peak AC. A ten-turn control to null offsets that may 3½ digit LED display.
be present at the voltage monitor output
Accuracy
Voltage Monitor Resolution
Better than ±0.05% of full scale.
Voltage Display
Better than ±0.1% of full scale, ±1 count.
referred to the voltage monitor.
Speed of Response (10% to 90%)
Less than 3 ms for a 1 kV step change.
Stability
Drift with Time
Less than 100 ppm/hour,
noncumulative.
Drift with Temperature
Less than 100 ppm/°C.
General
Line Supply
100, 115, or 230 V AC ±10%, 50-60 Hz
(specify when ordering).
Operating Conditions
Temperature
0 °C to 40 °C.
Relative Humidity
To 90%, noncondensing.
when the 344 is measuring zero volts.
Response Control
A ten-position push-button switch that
adjusts the gain of the 344 to optimize the
AC response. The response control is
normally adjusted when changing the type
of probe being used or when changing the
probe-to-surface separation.
Voltage Monitor Output
A buffered BNC output providing a lowvoltage replica of the measure voltage.
Scale
1/100th of the measured voltage.
(1/200th and 1/1000th ratios
are available.)
Output Noise
Less than 2 mV rms (measured with
the true rms feature of the Hewlett
Packard Model 34401A digital
multimeter).
Output Impedance
Less than 0.1 W.
Probe-to-Surface Separation
2 mm ± 1 mm (recommended).
Range
0 to ±999 V.
1 V.
Zero Offset
Mechanical
Dimensions
64 mm H x 220 mm W x 270 mm D
(2.5" H x 8.7" W x 10.6" D).
Weight
2 kg (4.4 lb).
Voltage Monitor Output Connector
BNC connector.
Ground Receptacle
Banana jack.
AC Line Cord Receptacle
Standard three-prong line cord receptacle.
Certification
TREK, INC. certifies that each Model 344 is
tested and calibrated to specifications using
measurement equipment traceable to the
National Institute of Standards and
Technology. A Certificate of Calibration
accompanies each instrument when it is
shipped from the factory.
Copyright ã 2011 TREK, INC. All specifications are subject to change. 1226/DEC
Model 344 Ordering Information
Model 344
Item Part No.
±2 kV Electrostatic Voltmeter (100 V AC). . . . . . . . . . . . . . . . . . . 344-F
±2 kV Electrostatic Voltmeter (115 V AC) . . . . . . . . . . . . . . . . . . 344-G
±2 kV Electrostatic Voltmeter (230 V AC) . . . . . . . . . . . . . . . . . . 344-K
1/100th voltage monitor ratio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 344
1/100th voltage monitor ratio with rear panel probe connector 344-1
1/1000th voltage monitor option . . . . . . . . . . . . . . . . . . . . . . . . 344-6
1/200th voltage monitor option . . . . . . . . . . . . . . . . . . . . . . . . . 344-9
Accessories
Item Part No.
Supplied
Operator's Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23012
Line Cord (100 V AC and 115 V AC). . . . . . . . . . . . . . . . . . . . . . N5002
Optional 611RA 19-inch Rack Adapter (2 instrument capacity)C5006
6003B Probe Line Driver (required when a very long probe
extension cable is used) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17126
6004B-EC Probe Extension Cable (from 344 to line driver) . . . 17102
6005B-EC Probe Extension Cable (from 344 to probe). . . . . . . 17127
Probes
Item Part No.
Standard Resolution
Model 6000B-7C (end-viewing, round body) . . . . . . . . . . . . . . . 17053
Model 6000B-8 (side-viewing, round body). . . . . . . . . . . . . . . . 17054
Model 6000B-15C (end-viewing, square body). . . . . . . . . . . . . 17046
Model 6000B-16 (side-viewing, square body). . . . . . . . . . . . . . 17047
High Resolution
Model 6000B-5C (end-viewing, round body) . . . . . . . . . . . . . . . 17051
Model 6000B-6 (side-viewing, round body). . . . . . . . . . . . . . . . 17052
Model 6000B-13C (end-viewing, square body). . . . . . . . . . . . . 17044
Model 6000B-14 (side-viewing, square body). . . . . . . . . . . . . . 17045
Miniature
Model 555P-4 (end-viewing, square body) . . . . . . . . . . . . . . . . 17205
Model 555P-1 (side-viewing, square body) . . . . . . . . . . . . . . . . 17184
High Temperature (up to 100 C)
Model 6300-7 (end-viewing, square body) . . . . . . . . . . . . . . . . 17287
Model 6300-8 (side-viewing, square body) . . . . . . . . . . . . . . . . 17288
°
TREK, INC. • 190 Walnut Street • Lockport, NY 14094 • USA • 800-FOR TREK
(fax) • www.trekinc.com • sales@trekinc.com 716-438-7555 • 716-201-1804
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