Trek's new Electrostatic Voltage Sensor, Model 875, is designed for in-line monitoring of electrostatic charge build-up, which if left unchecked would disrupt manufacturing processes and/or cause product degradation and early life failure of semiconductors and other charge-sensitive components. Used to monitor static charge levels within manufacturing equipment such as conveyors, handlers, and other tools.

At 4 mm ±1 mm probe-to-surface distance

Measurement Range
0 to ±500 V DC or peak AC.

Measurement Accuracy
At the Voltage Monitor Output
Better than ±0.5% of F.S.
At the Current Monitor Output
Better than ±3% of F.S.

Current Monitor (4-20 mA)
Linearly related to the measured input voltage.
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.

Speed of Response (10% to 90%)
Less than 25 ms for a 0 to ±500 V step change.

Voltage Monitor Output
A low voltage output which is linearly related to the
measured voltage value.
Scale Factor
(monitor output to measured value)
1 V/50 V.
Noise
Less than 1% rms of full scale (F.S.)
Output Load Current
5 mA, maximum.
Output Impedance
Less than 100 Ω.

Current Monitor Output (4-20 mA)
An output current which is linearly related to the
measured voltage. The voltage compliance range is +16 V.
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.

Digital Enable
An external control TTL signal.
A TTL HIGH (or open) will disable
all internal power supplies.
A TTL LOW will provide normal
ESVM operation.

Fault Warning Output
A TTL output signal. A TTL HIGH
indicates normal operation of the
Model 875. A TTL LOW indicates
a fault condition such as: out of
range operation (circuit is
measuring a voltage greater than
±500 Volts), failure of the probe,
or circuit malfunction.

ZERO Adjustment
A potentiometer adjusts for zero volts at the voltage
monitor output when the probe is measuring a zero
volt source.

Power ON Indicator
A LED indicator illuminates when power is applied to
the unit.

Probe Dimensions
5.6 mm square x 50 mm L

Aperture Orientation / Body Type
Side / Square.

Probe Cable Length
3.0 ±0.1 meters.

Recommended Probe-to-Surface Separation
4 mm ±1 mm.

An optional probe holder fixture is available - contact factory.