Products: Electrostatic Voltmeter Sensors & Monitors
Model 876 & 884 HAND-HELD Electrostatic Voltmeter
The Trek Models 876 and 884 Hand-Held Electrostatic Voltmeters provide accurate, noncontacting measurements of electrostatic surface voltage for ESD applications in either ionized or non-ionized environments. Industrial applications include measuring charge accumulation in the LCD manufacturing process or measuring static charge in semiconductor production. The Models 876 and 884 voltmeters utilize a new measurement technique that overcomes the disadvantage of the typical hand-held fieldmeter by providing surface voltage measurements which are essentially independent of the sensor probe to measured surface spacing.
Model P0876A (0 to ±2 kV DC)
Over a spacing range of 5 mm to 25 mm, the P0876A voltmeter provides better than a 5% voltage measurement accuracy, while the typical fieldmeter provides a voltage measurement error in excess of 50%.
Model 884 (0 to ±20 kV DC)
Over a spacing range of 30 mm to 60 mm, the 884 voltmeter provides greater than a 5% voltage measurement accuracy, while the typical fieldmeter provides a voltage measurement error in excess of 50%.
The Models 876 and 884 hand-held voltmeters employ an efficient and compact sensor probe design. The probe design allows for higher spatial resolution capability by allowing the measurement of small surface areas. The probe is attached to the meter with 6 feet of cable length. The length of cable provides the flexibility to make measurements in many locations that are impossible to reach using the large bulky sensing surfaces of the typical hand-held fieldmeter. A "hold" push button retains the displayed measured voltage value for recording purposes. The Models 876 and 884 provide a measurement system with calibration traceable to the National Institute of Standards and Technology.
PERFORMANCE
- P0876A
Measurement Range
0 to ±2 kV DC.Accuracy
Better than 5% of full scale over the entire recommended probe-to-surface separation range of 5 mm to 25 mm.
Voltage Display
Better than ±0.5% of full scale, referred to voltage monitor.
Stability
Drift with Time
Less than 600 ppm/hour, noncumulative.
Drift with Temperature
Less than 600 ppm/°C. - Model 884
Measurement Range
0 to ±20 kV DC.
Accuracy
Better than ±5% of full scale over the probe-to-surface
separation range of 30 mm to 60 mm.
Zero Offset
Less than ±4 counts.
Stability
Drift with Time
Less than 600 ppm/hour, noncumulative.
Drift with Temperature
Less than 600 ppm/°C.
PRODUCT FEATURES
- Model 876
- Hold
A push button that, when pressed, commands the voltage display to hold the value displayed until the button is released.
Voltage Display
3½ digit liquid crystal display.
Range
0 to ±1999 V.
Resolution
1 V.
Zero Offset
Less than ±1 count.
Sampling Rate
2.5 readings per second.Power On/Off
A push button.Probe Cable Length
1.8 meter (6 ft.). - Model 884
Hold
A push button that, when pressed, commands the voltage display to hold the value displayed until the button is released.
Voltage Display
3½ digit liquid crystal display.
Range
0 to ±19.99 kV.
Resolution
10 V.
Sampling Rate
2.5 readings per second.Power On/Off
A push button.Probe Cable Length
1.8 meter (6 ft.).
ACCESSORIES
- Accessories Supplied
- Operator's manual, 9-volt battery, 2 m coiled snap-on connector-to-alligator clip cable assembly (for ground reference connection).
GENERAL
- Model 876
- Dimensions
31 mm H x 59 mm W x 127 mm D,
(1.2" H x 2.3" W x 5"L).
Weight
200 g (7 oz), with battery.
Ground Receptacle
Snap-on connector.Power Requirements
One (1) 9-volt NEDA 1604 or equivalent battery.
Operating Time
8 hours with a new battery.
Operating Conditions
Temperature
15°C to 35°C.
Relative Humidity
To 85%, noncondensing. -
Model 884
Power Requirements
One (1) 9-volt NEDA 1604 or equivalent battery.
Operating Time
8 hours with a new battery.
Operating Conditions
Temperature
15°C to 35°C.
Relative Humidity
To 85%, noncondensing.
Dimensions
31 mm H x 59 mm W x 127 mm D
(1.2" H x 2.3" W x 5" L).
Weight
200 g (7 oz), with battery.
Ground Receptacle
Snap-on connector.
CERTIFICATION
TREK, INC. certifies that each Model 876 and Model 884 are tested and calibrated to specifications using measurement equipment traceable to the National Institute of Standards and Technology or to consensus standards.
Pollution Category
Degree 1: Operate in environments where no pollution or only dry, nonconductive pollution occurs.
All specifications are subject to change.