Once assembled in the acrylic frame, the two plates form a cavity that becomes the material test
area. Powder substances are loaded into the fixture completely filling the test cavity. A test volt-
age is applied to the power plate and current through the material is sensed on the measure-ment
plate.
B. Measurement Plate
The PRF-930 concentric measurement plate assembly
consists of a center plate with a diameter of approxi-
mately 2.4 cm (0.945 inch), having a surface area of 4.5
cm2 (0.7 in2). The center plate is separated from the
measurement guard plate by a virgin Teflon™ insert
(Figure 3).
When installed in the acrylic fixture the center plate is
positioned directly against the test material. The center
plate connects to the resistance instrument using the
Black receptacle on the plate’s outer surface (Figure 4).
The measurement guard plate connects to the instru-
ment’s ground reference using the Green receptacle on
the outer measurement plate assembly.
C. Power Plate
Power is applied to the material under test by the
fixture’s power plate. Connection to the power plate is
made using the Red connector (Figure 5). Test voltage
is applied to material under test by contact with the
power plate’s inner surface.
Figure 5: PRF-930 Resistance Fixture Power Plate
Figure 3: PRF-930 Measurement Plate As-
sembly – Inner Surface for Sensing Current
Through Test Material
Figure 4: Measurement Plate – Outer Sur-
face Connections
Power Plate
Outer Surface
Power Plate
Inner Surface
Power Connection
6
Rev. A / January 2010
PRF-930 Advanced Powder Fixture
