Trek 325 DC Stable Electrostatic Voltmeter - Manual (Page 2)

Model 325 Ordering Information Trek Certification
Probe
Item Part No.
Model 325-L (90 to 127 V AC) . . . . . . . . . . . . . . . . . . . . . . 325-L-CE
Model 325-H (180 to 250 V AC) . . . . . . . . . . . . . . . . . . . . . 325-H-CE
Model PD1216P High-Sensitivity Probe . . . . . . . . . . . . . . . PD1216P
TREK, INC. certifies that each Model 325 is tested and
calibrated to specifications using measurement equipment
traceable to the National Institute of Standards and
Technology or traceable to consensus standards.
Performance Features (cont.) Features (cont.)
Probe
General
Features
Response Speed Control Measurement Range Drift/Spacing Null Adjustment
A front panel potentiometer that adjusts 0 to ±40 V DC or peak AC.
the AC response of the Model 325.
Sensitivity
1 mV.
During operation, the metallic surfaces of
Accuracy
the probe are driven to voltage levels
Voltage Display
Voltage Monitor Output
equal to the measured surface voltage
3½ digit LED display.
Better than ±0.05% of full scale.
value, therefore, the probe holding fixture
Range
Voltage Display
must be of an insulating material of
Switch selectable for ±10 V
Better than or equal to ±2 counts,
7 11 approximately 10 to 10 ohms/square.
or ±40 V full scale.
referred to the voltage monitor.
Phenolic or other dissipative type material Resolution
is recommended to avoid any fixture Speed of Response (10% to 90%) 10 V Range
charge retention. At Fastest Speed Setting 0.01 V.
Probe-to-Surface Separation Less than 3 ms for a 10 V step. 40 V Range
0.2 mm to 2 mm (recommended). At Slowest Speed Setting 0.1 V.
Model PD1216P Sensor Probe Less than 5 ms for a 10 V step. Zero Offset
Aperture Orientation
±2 counts, referred to the
Noise (typical)
Side viewing.
voltage monitor.
Less than 1 mV rms,
Aperture Size
Sampling Rate
referenced to measured voltage.
4.6 mm (0.18").
3 readings per second.
Probe Body Type
Stability
Round body.
Voltage Monitor Output (1:1) Drift with Time
Dimensions
A buffered 0 to ±40 V output Less than 50 ppm/hour,
10 mm Diameter x 56 mm L
provides a replica of the measured noncumulative.
(0.4" Diameter x 2" L).
voltage. Drift with Temperature
Probe Cable Length
Scale Factor 1:1 monitor output
2743 mm ±127 mm (9 ft ±5").
1:1 of the measured voltage. Less than 50 ppm/°C.
Output Noise 10:1 monitor output
Less than 1 mV rms Less than 100 ppm/°C.
(measured using the true
Dimensions
rms feature of the Hewlett
108 mm H x 223 mm W x 370 mm D
Packard Model 34401A
(4.25² H x 8.75² W x 14.5² L).
digital multimeter). Null Voltage Source
Weight
Output Current A calibrated 10-turn dial representing a
3.6 kg (8 lb).
5 mA minimum. 0 to ±10 volt supply with switch
Voltage Monitor Connector
Output Impedance selectable polarity, is used to produce
BNC connector.
100 W, nominal. zero volts output when the probe is
Ground Receptacle
coupled to a known zero volt surface.
Banana jack.
Voltage Monitor Output (10:1) It is also used to null contact potentials
AC Line Cord Receptacle
A buffered 0 to ±4 V output on measured surfaces relative to the
Standard three-prong line cord with
providing a replica of the probe’s gold sensitive reference
integral fuse holder.
measured voltage. electrode.
Line Supply
Scale Factor Range
90 to 127 V AC at 48 to 63 Hz
10:1 of the measured voltage ±10 volts
(optionally available at 180 to 250 V AC
Output Current Accuracy
at 48 to 63 Hz).
5 mA minimum. 1%
Output Impedance Resolution
10 mV. 0.1 W, nominal.
This back panel adjustment
minimizes the variation in monitored
voltage values as the probe to test
surface spacing changes.
Model 325 Specifications
Copyright ã 2011 TREK, INC.
All specifications are subject to change.
1122/DEC
All specifications are with a Model PD1216P probe with a probe-to-surface separation of 0.4 mm.
TREK, INC. • 190 Walnut Street • Lockport, NY 14094 • USA • 800-FOR TREK
(fax) • www.trekinc.com • [email protected] 716-438-7555 • 716-201-1804