Trek 884 User Manual
Models 876 and 884
Hand-Held Electrostatic Voltmeters
! Model 876
Measurement Range:
0 to ±2 kV DC
!
! Model 884
Measurement Range:
0 to ±20 kV DC
!
! 1.8 meter (6 ft)
probe cable length
!
! Accurately measure
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 876 (0 to ±2 kV DC)
Over a spacing range of 5 mm to 25 mm, the 876 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.
surface voltage at a
wide range of spacings
!
! No need to maintain a
fixed spacing
!
! Inspect small spots for
charge accumulation
!
! Measure charge
accumulation in
difficult-to-reach
locations
!
! Chopper stabilized for
drift-free operation in
ionized environments
!
! Compliant
Measurement and Power Solutions
www.trekinc.com
TM
Models 876 and 884 General Specifications
Model 10/40A Specifications
All Model 876 specifications are with a probe-to-surface separation of 15 mm, ±10 mm.
All Model 884 specifications are with a probe-to-surface separation of 45 mm, ±15 mm.
Model 876 Model 884 Common Features
Performance Performance (cont.)
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.
Model 876 Compared to Typical Fieldmeter
Displayed Voltage vs. Probe-to-Surface Separation
V x 2
Displayed
Voltage
V
0
0 10 20 30 40 50
Probe-to Surface Separation (mm)
Surface Voltage
876 Performance
Typical Fieldmeter
Dimensions
31 mm H x 59 mm W x 127 mm D
(1.2" H x 2.3" W x 5" D).
Weight
200 g (7 oz), with battery.
Measurement Range Operating Time
0 to ±20 kV DC. 8 hours with a new battery.
Accuracy
Better than ±5% of full scale over the
entire recommended probe-to-surface
separation range of 30 mm to
60 mm.
Model 523 Compared to Typical Fieldmeter
Displayed Voltage vs. Probe-to-Surface Separation
Model 884 Compared to Typical Fieldmeter
Displayed Voltage vs. Probe-to-Surface Separation
V x 2
Hold
A push button that, when pressed,
commands the voltage display to
hold the value displayed until the
button is released.
Voltage Display
3 ½ digit liquid crystal display.
Range (Model 876)
Displayed
Voltage
V
0
0 20 40
80 100
60
Probe-to Surface Separation (mm)
Surface Voltage
884 Performance
Typical Fieldmeter
0 to ±1999 V.
Range (Model 884)
0 to ±19.99 kV.
Resolution (Model 876)
1 V.
Resolution (Model 884)
10 V.
Sampling Rate
2.5 readings per second.
Dimensions
31 mm H x 59 mm W x 127 mm D
(1.2" H x 2.3" W x 5" D).
Weight
200 g (7 oz), with battery.
Probe Cable Length
1.8 meter (6 ft.).
Zero Offset
Less than ±4 counts.
Trek designs and manufactures
many instruments for
Common Features
Electrostatic Overstress/
Electrostatic Discharge
(EOS/ESD)
Power On/Off
A push button.
monitoring, detection, and
measurement.
For more information about these
or other products, contact
TREK, INC.
Stability
Drift with Time
Less than 600 ppm/hour,
noncumulative.
Drift with Temperature
Less than 600 ppm/°C.
Copyright ã 2011 TREK, INC. All specifications are subject to change. 1123/DEC
Ordering Information
Models 876 and 884 Accessories Supplied
Item Part No.
Hand-held Electrostatic Voltmeter (0 to ±2 kV DC). . . . . . 876
Hand-held Electrostatic Voltmeter (0 to ±20 kV DC). . . . 884
Power Requirements
One (1) 9-volt NEDA 1604 battery,
IEC 6R61 battery, or equivalent.
Ground Receptacle
Snap-on connector.
Operating Conditions
Temperature
15°C to 35°C.
Relative Humidity
To 85%, noncondensing.
Item Part No.
Operating Instructions (Model 876). . . . . . . . . . . . . . 23100
Operating Instructions (Model 884) . . . . . . . . . . . . . . 23099
Ground Reference Cable Assembly . . . . . . . . . . . . . . . N9079
9-volt NEDA 1604 Battery, IEC 6R61 Battery, or
equivalent. . . . . . . . . . . . . . . . . . . . . . . . . . . . F1003
TREK, INC. • 190 Walnut Street • Lockport, NY 14094 • USA • 800-FOR TREK
(fax) • www.trekinc.com • sales@trekinc.com 716-438-7555 • 716-201-1804
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