Trek 320C User Manual
Model 320C
High-Sensitivity , DC Stable
Electrostatic Voltmeter
! Measurement Range:
0 to ±100 V DC or peak AC
!
! Sensitivity: 1 mV
!
! Speed of Response:
Less than 300 ms for a
100 V step
!
! Measurement Accuracy:
Better than 0.05% of
full scale
The Trek Model 320C Electrostatic Voltmeter is a versatile
instrument which is used for a variety of electrostatic
applications including contact potential measurements,
materials evaluation, and electret studies. The Model 320C
makes highly accurate, noncontacting measurement of
electrostatic potentials of 1 mV to 100 V over a wide range of
probe-to-surface distances. The Model 320C is specifically
designed for high sensitivity applications.
The Model 320C has adjustments to compensate for many
sensitive testing conditions. A calibrated Null Voltage supply
of ±10 volts nulls contact potentials when measuring
voltages on dissimilar materials. The Null Voltage source may
be used to null different work function voltages of the test
surface or to function as a zero suppression voltage source.
!
! Null Voltage Source:
10 volt nulling supply for
contact potential
measurements
!
! Response Speed Control:
AC response adjusted for
speed/noise
!
! Drift Spacing/Null
Adjustment:
A response Speed Control adjusts the speed/noise tradeoff
of the Model 320C AC response. A self locking Drift/Spacing
Null Adjustment
values as the probe to test surface spacing changes.
The front panel has an easy to read 3½ digit LED display. The
detected output voltage can be monitored through a 1:1
voltage monitor output and a switch selectable scale of 10:1
or 20:1 voltage monitor output.
The Trek patented low impedance probe assures
measurement accuracy which is essentially independent of
probe-to-test-surface spacing while eliminating the external
environmental effects of high humidity and contamination,
such as airborne dust, toner, ions and chemicals, on
measurement accuracy.
minimizes the variation in monitored voltage
Measurement and Power Solutions
www.trekinc.com
Minimizes variations in
voltage values as probe to
test surface spacing
changes
!
! Available Monitor Outputs:
1:1 of Voltage Monitor
Output 10:1 or 20:1
(switch selectable)
!
! compliant
TM
Model 320C Specifications
All specifications are with a probe-to-surface separation of 1 mm.
Model 10/40A Specifications
Performance Features (cont.) Features (cont.)
Measurement Range Response Speed Control Voltage Monitor Output
0 to ±100 V DC or peak AC. A front panel potentiometer that A buffered 0 to ±10 V output
adjusts the speed/noise tradeoff of providing a replica of the
Sensitivity
1 mV.
Accuracy
Voltage Monitor Output
Better than ±0.05% of full scale.
Voltage Display
Better than or equal to ±2 counts,
referred to the voltage monitor.
Speed of Response (10% to 90%) 100 V Range
Less than 300 ms for a 100 V step. 0.1 V.
Stability
Drift with Time
Less than 50 ppm/hour,
noncumulative. 3 readings per second.
Drift with Temperature
Less than 50 ppm/°C
(1:1 monitor output).
Less than 100 ppm/°C
(10:1/20:1 monitor output).
Features
Null Voltage Source
A calibrated 10-turn dial
representing a 10 volt supply, with
switch selectable polarity, used to
produce zero volts output when the
probe is coupled to a known zero
volt surface. Also used to null
contact potentials on dissimilar
surfaces.
Range
±10 volts
Accuracy
1%
Resolution
20 mV.
the Model 320C AC response. measured voltage.
Scale Factors
Voltage Display
3½ digit LED display. 20:1 of the measured voltage
Range
Switch selectable for ±10 V
or ±100 V full scale. 5 mA.
Resolution Output Impedance
10 V Range
0.01 V.
10:1 of the measured voltage or
(switch selectable)
Output Current
0.1 W, nominal.
General
Zero Offset
±1 count, referred to the
voltage monitor.
Sampling Rate
Drift/Spacing Null Adjustment
This back panel adjustment
minimizes the variation in monitored
voltage values as the probe to test
surface spacing changes.
Voltage Monitor Output (1:1 ratio)
A buffered 0 to ±100 V output
providing a replica of the measured
voltage.
Scale Factor
1:1 of the measured voltage.
Output Noise
Less than 5 mV rms
(measured using the true
rms feature of the Hewlett
Packard Model 34401A
digital multimeter).
Output Current
5 mA.
Output Impedance
100 W, nominal.
Dimensions
108 mm H x 223 mm W x 370 mm D
(4.25² H x 8.75² W x 14.5² D).
Weight
3.6 kg (8 lb).
Voltage Monitor Connector
BNC connector.
Ground Receptacle
Banana jack.
AC Line Cord Receptacle
Standard three-prong line cord with
integral fuse holder.
Line Supply
Factory set for one of two voltage
ranges: 90 to 127 V AC or 180 to
250 V AC, at 48 to 63 Hz
(specify when ordering).
Operating Conditions
Temperature
0 °C to 40 °C.
Relative Humidity
To 90%, noncondensing.
Probe-to-Surface Separation
1 mm (recommended).
Model 320C Ordering Information
Model 320C Electrostatic Voltmeter Trek Certification
Item Part No.
Model 320C-L (90 to 127 V AC) . . . . . . . . . . . . . . . . . . . . . 320C-L
Model 320C-H (180 to 250 V AC). . . . . . . . . . . . . . . . . . . . 320C-H
Probe
Model 3250 High-Sensitivity Probe . . . . . . . . . . . . . . . . . . . 17014
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
Copyright ã 2011 TREK, INC.
All specifications are subject to change.
1122/DEC
TREK, INC. certifies that each Model 320C is tested and
calibrated to specifications using measurement equipment
traceable to the National Institute of Standards and Technology
or traceable to consensus standards. A Certificate of Calibration
accompanies each instrument when it is shipped from the
factory.
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