Trek 323 User Manual
Model 323
High-Sensitivity , DC Stable
Electrostatic Voltmeter
! Measurement Range:
0 to ±100 V DC or Peak AC
!
! Sensitivity: 5 mV
!
! Speed of Response:
Less than 300 ms for a
100 V step
!
! Measurement Accuracy:
Better Than 0.05% of Full
The Trek Model 323 Electrostatic Voltmeter performs highly
sensitive voltage measurements using a variety of Trek sideview probes with various body types (round, square).
The Model 323 is a versatile instrument used for a variety of
electrostatic applications including materials evaluation,
electret studies, charge accumulation on disk drive
assemblies, and other extremely sensitive ESD sensitive
components.
The Model 323 is specifically designed for high sensitivity
applications and performs highly accurate, noncontacting
measurement of electrostatic potentials of 0 to 100 V over a
wide range of probe-to-surface distances.
The Model 323 has adjustments to compensate for many
sensitive testing conditions. The response Speed control
adjusts the speed/noise tradeoff of the AC response. The
Drift/Spacing Null Adjustment
offset voltage as the probe to test surface spacing changes.
minimizes the variation in zero
Scale
!
! Null Voltage Source:
10 Volt Nulling Supply
!
! Response Speed Control:
AC Response Adjusted for
Speed/Noise
!
! Drift Spacing/Null
Adjustment: Minimizes
Variations in voltage values
as probe to test surface
spacing changes
!
! Available Monitor Outputs:
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.
Trek patented low impedance probes assure measurement
accuracy essentially independent of probe-to-test-surface
spacing, humidity conditions, and contamination such as
airborne dust, toner, ions and chemicals.
Measurement and Power Solutions
www.trekinc.com
1:1 of Voltage Monitor Output
10:1 or 20:1 (switch
selectable)
!
! Additional Probes Available
!
! Compliant
TM
Model 323 Specifications
All specifications are with a Model 6000B-8 probe with a probe-to-surface separation of 1 mm.
Model 10/40A Specifications
Performance Features (cont.) Features (cont.)
Measurement Range Probe-to-Surface Separation Voltage Monitor Output
0 to ±100 V DC or peak AC. 1 mm to 3 mm. A buffered 0 to ±10 V output
providing a representation of the
measured voltage.
Scale Factors
10:1 of the measured voltage or
20:1 of the measured voltage
(switch selectable).
Output Current
5 mA.
Output Impedance
0.1 W, nominal.
General
Dimensions
108 mm H x 223 mm W x 380 mm D
(4.25" H x 8.75" W x 15" 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.
Copyright ã 2011 TREK, INC.
All specifications are subject to change.
1138/DEC
Sensitivity
5 mV.
Accuracy
DC Accuracy
Better than 0.05% of full scale.
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%)
Less than 300 ms for a 100 V step
(adjustable).
Stability
Drift with Time
Less than 50 ppm/hour,
noncumulative.
Drift with Temperature
1:1 Monitor Output
Less than 10 mV/°C
10:1 Monitor Output
Less than 5 mV/°C
20:1 Monitor Output
Less than 5 mV/°C
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.
Range
±10 volts
Accuracy
1%
Resolution
20 mV.
Response Speed Control
A front panel potentiometer that
adjusts the speed/noise interrelationship of the Model 323
AC response.
Voltage Display
3½ digit LED display.
Range
Switch selectable for ±10 V
or ±100 V full scale.
Resolution
10 V Range
0.01 V.
100 V Range
0.1 V.
Zero Offset
±2 counts, referred to the
voltage monitor.
Sampling Rate
3 readings per second.
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 representation
of the measured voltage.
Scale Factor
1:1 of the measured voltage.
Output Noise
Less than 20 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.
Model 323 Ordering Information
Model 323 Electrostatic Voltmeter Trek Certification
Item Part No.
Model 323-L (90 to 127 V AC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 323-L
Model 323-H (180 to 250 V AC) . . . . . . . . . . . . . . . . . . . . . . . . . . 323-H
Probes
Model 6000B-8 Probe (side-viewing, round body) . . . . . . . . . . 17054
Model 6000B-16 Probe (side-viewing, square body) . . . . . . . . 17047
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
TREK, INC. certifies that each Model 323 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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