Prostat PRF-914B, User Manual

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5
Rev. A / November 2005
PRF-914B High Resistance Miniature Concentric Ring Fixture Set
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-914B resistance fixture approxi¬mates the same
measurements obtained when using a standard ESD Associa
tion Standard ANSI/ESD S11.11 concentric ring fixture.
4. Overall size of the PRF-914B is 0.50 inches in diameter by 6.3
inches (175 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-914B Standard accessories include protective cover, one
RG-174 cable, a BNC/banana adapter and instructions
6. Optional accessories include the PRV-913B Dual Fixture Verifi -
cation Reference, described below.
B. PRV-913B Dual Verification Fixture Description
1. Approximately 2 inches (50.1mm) square by 0.82 inches (21mm) thick, the PRV-913B is de -
signed 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 incor -
porating 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 resis -
tance 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 con -
necting 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 refer¬ence surface. It has the capability of providing a 1-meg -
ohm (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 +5% error.
3. PRV-913B fixture contact surfaces consist of copper substrates, finished with nickel and hard
Gold plating.
Figure 11: Concentric Ring Con -
figuration
Contact
Diameter:
0.30 inches
Outer Ring
Contacts
Center Electrode
Overall Length without covers: 6.3 Inches (175 mm)