PRF-912B & PRV-913V Miniature Concentric Ring Fixture Set
5
PRF-912B Resistance Fixture
Overall Length 5.9 Inches (150 mm)
Figure 3: PRF-912B Profile with protective covers removed
B. PRV-913B Dual Verification Fixture Description
1. Approximately 2 inches (50.1mm) square by 0.82 inches (21mm) thick, the PRV-
913B is designed to confirm the proper function of the PRF-912B, PRF-914B and
PRF-922B Microprobe Resistance Fixtures. It consists of a high quality black
anodized housing and circuit board incorporating an array of ten (10) each 10
megohm precision (
±
2%) resistors in parallel, connecting the center pad to each of
the ten peripheral trace pads, it provides a specific reference resistance of 1.0x10
6
ohms (
±
5%) on the concentric ring side.
On the other side, it consists of a circuit board containing 1 each, 1 megohm (1%)
resistor connecting two peripheral trace pads. It provides a specific reference
resistance of 1.0 x 10
6
ohms (+/- 1%) on the two-point side.
2. Properly used, the PRV-913B insures that all PRF-912B
& PRF-914B spring loaded test probes make defined
contact with the reference surface. It has the capability
of providing a 1-megohm (1.0x10
6
ohm) reference
measurement with a theoretical maximum total variance
of 9.5x10
5
to 1.05x10
6
ohms. Typical reference
measurements range from 1.01x10
6
to 1.03x10
6
ohms,
i.e., equal to or less than +3% error.
3. PRV-913B fixture contact surfaces consist of copper
substrates, finished with nickel and hard Gold plating.
a. To accommodate the PRF-912B or 914B center
electrode a single gold contact point is positioned at
the center of the PRV-913B Verification Test
Surface.
The center position is connected to the ten individual
outer ring
trace pads by the ten, 10 megohm resistors.
Figure 4: PRV-913B Resistance
Verification Reference
