Trek 347 User Manual
Trek Model 347
DC-Stable Electrostatic Voltmeter
This non-contacting electrostatic voltmeter provides precision
and value for surface voltage measurements in the range of ±3 kV
DC or peak AC. Model 347 utilizes a field-nulling technique for
non-contacting voltage measurement that achieves DC stability
and high accuracy, with no need for fixed probe-to-surface
spacing. This permits the accurate measuring of stationary or
moving surfaces. Patented probe design enhances noise and
drift performance in the presence of contaminating particulate or
under conditions of high humidity and/or wide temperature
ranges.
Key Specifications
! Measurement Range: 0 to ±3 kV DC or peak AC
! Measurement Accuracy: Better than 0.05% of full scale (monitor)
! Speed of Response: Less than 3 ms for a 1 kV step (10% to 90%)
Typical Applications Include
! Surface voltage measurements of photoconductors or dielectric surfaces
! Charge monitoring in semiconductor production
! Measuring of electrostatic potentials on film, polymers, 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
Digital Enable allows an external device to turn the internal HV power supply on/off
!
Well-suited for automated or computer-controlled systems
!
Easy-to-read LED display
!
Large selection of 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
Standard Resolution High Resolution
PN 6000B-7C: End-viewing, round body PN 6000B-5C: End-viewing, round body
PN 6000B-8: Side-viewing, round body PN B000B-6: Side-viewing, round body
PN 6000B-15C: End-viewing, square body PN 6000B-13C: End-viewing, square body
PN 6000B-16: Side viewing, square body PN 6000B-14: Side-viewing, square body
Miniature High Temperature (up to 100°C)
PN 555P-4: End-viewing, square body PN 6300-7: End-viewing, square body
PN 555P-1: Side-viewing, square body PN 6300-8: Side-viewing, square body
TREK, INC. • 190 Walnut Street • Lockport, NY 14094 • USA • 800-FOR TREK
585-798-3140 • 585-798-3106 (fax) • www.trekinc.com • sales@trekinc.com
Model 347 Specifications
Performance
Measurement Range
0 to ±3 kV DC or peak AC
Measurement Accuracy
Voltage Monitor Output
Better than ±0.05%
Voltage Display
Better than ±0.1% of full scale, referred to
the voltage monitor
Speed of Response
(10% to 90%)
Less than 3 ms for 1 kV step
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
(Other scale factors available)
Output Noise
Less than 2 mV rms*
Output Impedance
Less than 0.1 W
Front Panel Meter
Voltage Display
3 ¾ digit LED display
Range
0 to V±3 k
Resolution
1 V
Zero Offset
±1 count
Sampling Rate
2.5 readings per second
Features
Zero Control
A multi-turn control to produce zero volts
output when the probe is coupled to a
known zero volt surface
Automatic Gain Control
A ten-position, push-button switch that
adjusts the gain of the 347 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.
Digital Enable
An open collector, TTL compatible input
to turn on and off the internal high-voltage
power supply. A TTL high will turn off the
high voltage. A TTL low will turn on the
high voltage.
Mechanical
Dimensions
108 mm H x 233 mm W x 357 mm D
(4.25” H x 8.75” W x 14” D)
Weight
3 kg (6.6 lb)
Voltage Monitor
Output Connector
BNC connector
Digital Enable
Connector
BNC connector
Probe to Surface
Separation
2 mm, ±1 mm (recommended)
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.)
Electrical
AC Line Cord
Receptacle
Standard 3-prong with integral power switch
and 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 Consumption
50 VA, maximum
Supplied Accessories
Operator’s Manual
PN: 23106
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 the
probe cable length
exceeds 6 meters
Model: 6003B
Probe Extension
Cable (from the 347
to the driver)
Model: 6004B-EC
Probe Extension
Cable (from the 347
to the probe)
Model: 6005B-EC
Full-Rack Mount Kit
Half-Rack Mount Kit
Model: 603RA
Model: 604RA
*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. 1230/DEC
TM
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