PRF-912B & PRV-913B Miniature Concentric Ring Fixture Set
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a. The PRF-912B’s center electrode is electrically separated from the outer ring
contacts by a high resistance dielectric (Teflon). The center electrode acts as a
current sensor during resistance measurements. It is connected to the negative (-
) terminal of a wide range measurement instrument via the RG-174 coaxial
cable’s inner conductor, BNC coupler and dual BNC/Banana adapter.
b. The outer ring contacts are electrically connected at a common point. They apply
the test voltage to the material under test during a resistance measurement.
They are connected to the positive (+) terminal of the wide range measurement
instrument via the RG-174 coaxial cable’s outer conductor, BNC coupler and
dual BNC/Banana adapter.
c. The fixture’s total surface contact diameter is approximately 0.30 inches, and is
ideal for measuring surface resistance of small areas, 0.32 inches or larger.
3. The PRF-912B resistance fixture
approximates the same
measurements obtained when
using a standard ESD
Association Standard ANSI/ESD
S11.11 concentric ring fixture.
4. Overall size of the PRF-912B is
0.50 inches in diameter by 5.9
inches (150 mm) long. (Figure 3)
This optimal size and shape
make the fixture very comfortable
and easy to handle. Its outer
housing is made of black
anodized aluminum.
5. PRF-912B Standard accessories
include protective cover, one RG-
174 cable, a BNC/banana
adapter and instructions
6. Optional accessories include the PRV-913B Dual Fixture Verification Reference, de-
scribed below.
Center Electrode
Outer Ring
Contacts
Contact
Diameter
0.30 Inches
Figure 2: Concentric Ring Configuration
