Trek 368A User Manual
Model 368A
High-Speed, DC Stable Noncontacting
Electrostatic Voltmeter
! Noncontacting
measurement range
0 to ±2 kV or peak AC
!
! Speed of Response
less than 200 ms for a
1 kV step
!
! Accuracy better than
0.1% of full scale
!
Trek’s Model 368A High-Speed Electrostatic Voltmeter provides
precision noncontacting measurement of the surface voltages
associated with electrostatic imaging processes as employed by
the electrophotographic reproduction and laser printing industries.
Highly accurate electrostatic voltage measurements are also
associated with applications such as photoreceptor research and
semiconductor processing. The 368A is used in research and
development applications and to measure electrostatic potentials
on objects or surfaces such as polymer, film, fabric, and paper.
The miniature sensor probes utilize a patented dual chopper
design. This design provides high-speed, DC stable measurements
with exceptional low noise and drift performance in wide
temperature range conditions, under high humidity, and even
in the presence of contaminating particulates. Sensor probe
options include standard or high-temperature probes with either an
end-viewing or side-viewing orientation.
The voltage of moving or stationary surfaces can be easily
measured with high accuracy over a wide range of sensor probe to
measured surface spacings. The noncontacting measurement
ensures that no charge transfer will take place to modify or destroy
the actual data.
A user selectable dual range precision voltage monitor provides a
low-voltage replica of the measured electrostatic voltage for
external monitoring purposes or for use as a feedback signal in a
closed loop control system.
Rack mount options are available to permit up to four independent
measurement channels in a standard full rack or for compact
bench top operation.
! Easy to read 3½ Digit
LED display
!
! Superb noise and drift
performance
!
! Miniature probes
!
! Precision voltage
monitor provides lowvoltage replica of
measured voltage
!
! Up to four independent
channels in full rack
mountable
configuration
!
! compliant
Measurement and Power Solutions
www.trekinc.com
TM
Model 368A Specifications
All specifications are with a probe to surface separation of 2 mm.
Model 10/40A Specifications
Performance Features General (cont.)
Measurement Range Zero Control
0 to ±2 kV DC or peak AC. A 10-turn control to null offsets that
may be present at the voltage monitor
Measurement Accuracy
Voltage Monitor Output
output when the Model 368A is
measuring zero volts.
Better than ±0.1% of full scale.
DPM Voltage Display
Better than ±0.15% of full scale,
±1 digit referred to the voltage
monitor.
Voltage Display
3 ½ digit LED display.
Range
0 to ±1999 V.
Dimensions
Stand-Alone Instrument
133 mm H x 113 mm W x 341 mm D
(5.3" H x 4.5" W x 13.5" D).
Half Rack (holds up to two channels)
133 mm H x 271 mm W x 353 mm D
(5.3" H x 10.7" W x 13.9" D)
Full Rack (holds up to four channels)
133 mm H x 483 mm W x 353 mm D
(5.3" H x 19" W x 13.9" D).
Resolution
Speed of Response (10% to 90%)
Less than 200 ms for a 1 kV step
change.
Stability
Drift with Time
Less than 100 ppm/hour,
noncumulative.
Drift with Temperature
Less than 200 ppm/°C.
Probe-to-Surface Separation
2 mm ±1 mm (recommended).
Probe (standard)
Aperture Size
3800E-2 end viewing
1.85 mm diameter.
3800S-2 side viewing
2.35 mm diameter.
Cable Length
3 m (10 ft), nominal.
3800E-2
APERTURE 1.85 mm
(end viewing type)
2.8 mm
C
W 5.6 mm
C
L
H 5.6 mm
C
L
L
3800S-2
APERTURE 2.35 mm
(side viewing type)
C
L
3.5 mm
Note: The probe body is driven to match
the measured voltage value and must
be insulated from ground.
1 V.
Zero Offset
Better than or equal to ±1 count,
referred to the voltage monitor.
Sampling Rate
2.5 readings per second.
Voltage Monitor Output
A BNC provides a low-voltage
replica of the measured
voltage.
Scale Factors
1/200th or 1/1000th of the
measured voltage (switch
selectable). Calibration
potentiometers for both scales
are accessible from the front
panel.
Output Noise
Less than 25 mV rms
(measured using the true
rms feature of the Hewlett
Packard Model 34401A digital
multimeter).
Output Impedance
Less than 0.1 W.
Power ON/OFF
Two position toggle switch.
General
Voltage Monitor Connector
BNC connector.
Copyright ã 2011 TREK, INC All specifications are subject to change.1122/DEC
Weight
Stand-Alone Instrument
2 kg (4.4 lb).
Half Rack
1.5 kg (3.3 lb), add 1.5 kg (3.3 lb)
per channel.
Full Rack
2.5 kg (5.5 lb), add 1.5 kg (3.3 lb)
per channel.
Ground Receptacle
Banana jack.
AC Line Cord Receptacle
Standard IEC 320 three-prong AC line
connector with an integral fuse holder.
Power Requirements
Line Voltage
Factory set for one of two ranges:
90 to 127 V AC or 180 to 250 V AC,
at 50/60 Hz
(specify when ordering).
Power Consumption
35 VA, maximum.
Operating Conditions
Temperature
0°C to 35°C.
Relative Humidity
To 85%, noncondensing.
Altitude
To 2000 meters.
Model 368A Ordering Information
Model 368A Probes
Item Part No.* Item Part No.
Stand-Alone Instrument . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 368ASU Standard
Half-Rack, One Channel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 368ASX
Half-Rack, Two Channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 368ADX
Full-Rack, One Channel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 368AS
Full-Rack, Two Channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 368AD
Full-Rack, Three Channels. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 368AT
Full-Rack, Four Channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 368AQ Optional
*Add the suffix L for 90 to 127 V AC operation and the
suffix H for 180 to 250 V AC operation.
Model 3800E-2 (end viewing) . . . . . . . . . . . . . . . . . . . . . . . . . . 17351
Model 3800S-2 (side viewing). . . . . . . . . . . . . . . . . . . . . . . . . . 17350
High-Temperature (up to 60°C)
Model 3870ET-2 (end viewing) . . . . . . . . . . . . . . . . . . . . . . . . . 17379
Model 3870ST-2 (side viewing) . . . . . . . . . . . . . . . . . . . . . . . . . 17380
Model 3800EC-2 Probe Extension Cable . . . . . . . . . . . . . . . . . 17385
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
Loading...