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Resistance
Indicator and Probe
Resistance and Resistivity
Measurements:
Meeting Test Standards
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Before specifying a resistance/resistivity
meter for your application, it’s helpful to understand
the standards these meters should meet.
Resistance characterization of material
or finished product is a primary requirement in the
static-control industry to define the static-dissipative
characteristics of ESD-safe material and products. It
is also used wherever the conductive or insulative properties
of materials are required.
Test standards used to describe the
resistance characterization of material define specific
electrode configurations. ASTM D 257 is the test standard
that applies to measurement of surface and volume resistivity
of insulative material using either parallel bar or
concentric ring electrodes. ESD Association Standards
S11.11 and S11.12 define a specific D 257 concentric
ring electrode configuration to measure surface and
volume resistance of dissipative planar material. ASTM
D 991 utilizes a 4-pole measurement fixture for measuring
bulk resistance of conductive material. ESD Association
standards specify a five-point, 2.5"-diameter probe
with conductive rubber electrode for measuring point-to-point
resistance and resistance-to-ground of ESD-protective
work surfaces, floors and seating. ASTM F 150 and NFPA
99 specify a similar probe.
Terra’s line of resistance/resistivity
probes and test fixtures is designed to meet these requirements.
The probes incorporate electrode dimensions that enable
the user to convert a surface resistance measurement
of surface resistivity by multiplying the reading by
10. |
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Autoranging
Resistance Indicator
Comes complete with 9-volt
battery, RTG cable and vinyl case. |
| Cat.
# |
$/Each |
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3100-20 |
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Autoranging Resistance Indicator
- Ideal for measuring surface resistance
and resistance-to-ground (RTG) on conductive mats,
chairs, bench surfaces, packing material and other
ESD-safe surfaces
- Incorporates parallel bar resistivity
electrodes
- Conforms to test requirements specified
in ASTM D 257, EIA-541, NFPA 99, EOS/ESD-4, DAD standards
and ASTM F 150 where a 10-volt excitation voltage
may be used (with optional resistance probe below).
- Delivers 10% measurement accuracy
- Compact and low cost
This precision, easy-to-use instrument
incorporates features found only in more expensive units.
Twelve LEDs indicate the conductive (green), static-dissipative
(yellow) and insulative (red) ranges in one-decade steps
from <103 to >1012 Ohms.
Accuracy is ± 10% of the mean
value, with changeover points of ± .5 decade
on a logarithmic scale. Measurements in the conductive
range are made at 10 volts, and all remaining measurements
are made at 100 volts.
Auxiliary input jacks enable this
resistance indicator to be used for measuring RTG, point-to-point,
and surface and volume resistance utilizing optional
probes and fixtures. The internal electrodes are disconnected
when external ones are attached. |
| Specifications |
| Resistance
Range: |
<103 to >1012 Ohms |
| Surface
Resistivity Range: |
<103 to >1012 Ohms/sq. |
| Range
Selection: |
Autoranging |
| Accuracy: |
±
10% of mean value |
| Open
Circuit Test Voltage: |
10
Volts @ <105 Ohms |
| 100
Volts @ >106 Ohms |
| Dimensions: |
5.0"
x 2.5" x 1.1" (13 x 6.5 x 2.8cm) |
| Weight: |
8.3
oz. (.23 kg) |
| Electrode
Resistance: |
2.5"
(6.25cm) parallel chrome bars |
| Electrode
Resistivity: |
2.5"
(6.25cm) parallel chrome bars |
| Electrode
External: |
VE
& Sense jacks |
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 Resistance
Measuring Kit
A low-cost alternative
for measuring surface resistance, point-to-point
and point-to-ground resistance. Includes No.
3100-20 above, in addition to two No. 3100-13
probes (see below), a utility wiring verifier,
and ground plane, housed in a molded carrying
case. Comes with a Certificate of Calibration
and CE Compliance.
| Cat.
# |
$/Each |
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3100-21 |
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| Specifications |
| Dimensions: |
2.75" diameter x 5.375"
height |
| Weight: |
5 lbs. |
| Electrode: |
2.5" dia., carbon load
silicon rubber
R contact <30 ohms (Pv = 8 ohms/cm)
Hardness: 65 durometer |
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Surface Resistance Probe
| Cat.
# |
$/Each |
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3100-13 |
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Surface Resistance Probe
- Specifically developed to meet EOS/ESD Std. 4, NFPA
99 and ASTM F 150 requirements
- Ideal for measuring the resistance of static-dissipative
surfaces, such as floors, work surfaces and mats
- Operates with a wide range of ohmmeters, including
Auto Ranging Resistance indicator No. 3100-20
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