Trek 875 Electrostatic Voltage Sensor - Manual

Model 875
Electrostatic Voltage Sensor
Copyright Ó 2012 TREK, INC. All specifications are subject to change. 1225/DEC
Trek’s Model 875 Electrostatic Voltage Sensor is designed for in-line monitoring
of electrostatic charge build-up, which if left unchecked, can disrupt
manufacturing processes or cause product degradation and early life failure of
semi-conductors and other charge-sensitive components. Excellent for
monitoring static charge levels within manufacturing equipment such as
conveyors, handlers, and other tools, the 875 features an automatic calibration
technique to maintain high accuracy and speed over wide variations of spacing
between the non-contacting measurement probe and the surface under test.
Other features include a voltage measurement range of ± 500 V DC or peak AC,
accuracy of ±0.5%, speed of 25 ms, and low noise of 1% rms of full scale.
Buffered output voltage and current monitors (4 to 20mA) are provided for remote
monitoring and alarm purposes. The unit is powered by +24 V DC and is housed in
a standard DIN package to enable standardized mounting.
!
Measurement Range of
0 to ±500 V DC or peak AC
! Accuracy is Independent of
Probe-to-Measured Surface
Spacing
!
Voltage Monitor with an
Accuracy Better than
±0.5% of full scale (F.S.)
!
4-20 mA Current Monitor
!
Speed of Response < 25 ms
! Enclosure Mounts on 35mm
DIN RAIL
!
TTL Digital Enable Input
!
TTL Fault Warning Flag
Output
!
compliant
!
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!
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PERFORMANCE FEATURES PROBE
GENERAL
At 4 mm ±1 mm probe-to-surface
Probe Dimensions Voltage Monitor Output
distance
5.6 mm square x 50 mm L A buffered low-voltage replica of the
measured voltage.
Aperture Orientation / Body Type Measurement Range
Scale Factor
Side / Square. 0 to ±500 V DC or peak AC.
1 V / 50 V.
Probe Cable Length
Noise Measurement Accuracy
3.0 ±0.1 meters.
Less than 1% rms of full scale. At the Voltage Monitor Output
Better than ±0.5% of F.S. Recommended Probe-to-Surface
Digital Enable
At the Current Monitor Output Separation
Better than ±3% of F.S. 4 mm ±1 mm.
An optional probe holder fixture is
available - contact factory.
Linearly related to the measured
input voltage.
Fault Warning Output
Power Supply Voltage
A TTL output signal. A TTL HIGH
+24 V DC ±10%.
indicates normal operation of the
Power Supply Current
Model 875. A TTL LOW indicates
150 mA, maximum.
a fault condition such as: out of
range operation (circuit is
Speed of Response (10% to 90%) Power ON Indicator
measuring a voltage greater than
Less than 25 ms for a 0 to ±500 V A LED indicator illuminates when
±500 Volts), failure of the probe,
step change. power is applied to the unit.
or circuit malfunction.
Current Monitor (4-20 mA)
Scale Factor (+4 mA to +20 mA
representing a -500 V to +500 V):
-500 V = 4 mA,
0 V = 12 mA,
+500 V = 20 mA.
An external control TTL signal.
A TTL HIGH (or open) will disable
all internal power supplies.
A TTL LOW will provide normal
ESVM operation.
190 Walnut Street • Lockport, NY 14094 • 800-FOR TREK fax • [email protected] 716-438-7555 • 716-201-1804
Measurement and Power Solutions
TM
www.trekinc.com