Trek 875 靜電感測器
•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
At 4 mm ±1 mm probe-to-surface distance
0 to ±500 V DC or peak AC.
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.
(monitor output to measured value)
1 V/50 V.
Less than 1% rms of full scale (F.S.)
Output Load Current
5 mA, maximum.
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.
+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
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.
A potentiometer adjusts for zero volts at the voltage
monitor output when the probe is measuring a zero
Power ON Indicator
A LED indicator illuminates when power is applied to
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.