
4Rev. A / September 2007
PRF-922A-B Two-Point Probe Adapter
I. IntroducƟon & DescripƟon
The PRF-922A-B Miniature Two-Point Adapter Resistance Fixture is designed for use with Prostat’s
PRF-912B and PRF-914B Miniature Concentric Ring Resistance Fixtures. The PRF-922A-B 2-Point
Adapter converts the PRF-912B and PRF-914B concentric fixtures to a 2-Point measurement fixture in
accordance with the ANSI/ESD STM11.13 Two-Point Resistance Measurement standard test method. It
will accurately measure surface resistance of small areas. It consists of a housing that fits over the con-
centric ring assembly of either the PRF-912B or PRF-914B miniature probe fixtures, two spring loaded
measurement probes and built in spacer to prevent excess probe pressure. Removable conducve
rubber probe covers are supplied to reduce contact resistance. A locking screw holds the adapter onto
the host fixture and in contact with the PRF-912B or PRF-914B concentric ring test contacts.
Refer to the PRF-912B and PRF-914B Operang manuals for de-
tailed instrucons on use of those fixtures.
A. Descripon
This precision fixture consists of 2 gold plated, spring-loaded
contact electrodes spaced 0.250 inches (6.35mm) apart, center-
to-center. The electronic quality gold plated contact probes are
0.1-inch (2.54mm) in diameter, and are supplied with con-
ducve synthec rubber contact boots, which are 0.125-inch
(3.18mm) diameter. The conducve boots are used to reduce
contact resistance between the gold contact probes and mate-
rials under test in certain applicaons.
1. The resistance measurement range of the PRF-922A-B Adapter fixture is 0.9 ohms at <10 volts
to 1.0E+12 (1.0x1012) ohms at 100 volts.
2. Contacts are pogo-pin type ATE quality probes made of beryllium Copper, coated with 60 micro
inch of hard Gold. Spacing allows for measurement of items with surfaces approximately 0.125
inches wide having a length of 0.32 inches or larger.
3. The contact assembly’s outer housing incorporates “stops” that insure consistent contact pres-
sure during measurement.
4. Overall size of the PRF-922A-B Adapter is 0.50 inches in diameter by 2.7 inches long. This op-
mal size and shape make the fixture very comfortable and easy to handle. Its outer housing is
made of black anodized aluminum.
5. The PRF-922A-B Standard accessories include a protecve cover, 1 Allen Wrench for mounng
and 1 extra pin.
II. CauƟons & Warnings
As with any electrical device, use proper electrical precauons and measurement pracces to avoid per-
sonnel shock. Read this manual in its enrety before aempng to use these products.
NOTE
This manual displays Cauons and Warnings alerng the user to hazardous operaon and ser-
vicing condions. CAUTION or WARNING headings throughout this publicaon flag this infor-
maon, where appropriate. Follow all Cauon and Warning instrucons at all mes.
Figure 1: PRF-922A-B Miniature
2-Point Adapter Resistance Fixture
Set.