Trek 325 DC Stable Electrostatic Voltmeter - Manual

High-Sensitivity , DC Stable
Electrostatic Voltmeter
The Trek Model 325 Electrostatic Voltmeter is a versatile
instrument used for performing noncontacting electrostatic
voltage measurements in applications which include
contact potential (surface work function) determination,
materials evaluation and electret studies. The Model 325
was specifically designed for high sensitivity applications to
allow highly accurate, low noise, noncontacting
measurement of electrostatic voltages of 0 to ±40 V over a
wide range of probe-to-surface distances.
Special features of the Model 325 allow adjusting the
performance of the unit to compensate for specific test
conditions. A calibrated Null Voltage supply of 0 to ±10 volts
nulls measured surface contact potential when measuring
voltages on test surfaces. A response Speed Control adjusts
the AC response of the Model 325. A Drift/Spacing Null
Adjustment minimizes the variation in monitored voltage
values as the probe to test surface spacing changes.
Trek’s patented low impedance probe sensor 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.
The Model 325 is bench top operable or, with optional
hardware, in a half 9½-inch or standard 19-inch rack.
A dual range front panel 3½ digit LED display resolves
±10 mV. The measured voltage can also be monitored
through a precision 1:1 voltage monitor output and/or a
10:1 voltage monitor output.
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Measurement Range:
0 to ±40 V DC or Peak AC
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Sensitivity: 1 mV
!
Noise: Less than 1 mV
rms, Referenced to
Measured Voltage
!
High Seed of Response:
Less Than 3 ms for a
10 V Step
!
Voltage Monitor
Accuracy: Better Than
0.05% of Full Scale
!
Null Voltage Source:
0 to ±10 Volt Calibrated
Supply (nulls measured
surface contact potential
in reference to probe’s
gold sensing electrode)
!
Drift Spacing/Null
Adjustment (minimizes
measured variations in
voltage as probe to test
surface spacing changes)
!
Voltage Monitor Outputs:
1:1 and 10:1 of measured
voltage
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Model 325
Measurement and Power Solutions
TM
www.trekinc.com