Resistivity Tests - Keithley 485 Instruction Manual

2.9.5 Resistivity Tests
The Model 485 may be used along with the Model 6105 to
perform resistivity tests. The Model 6105 is a guarded test fix-
ture for measurement of surface and volume resistivities. The
chamber is designed in accordance with ASTM Standard
Method of Test Electrical Resistance of Insulating Materials,
D257-66. The Model 6105 can be used in conjunction with
the Model 485 and a high voltage power supply, such as the
Modal 247.
Resistivity can be determined by measuring the current
through a sample with a known voltage impressed. The
Model 6105 can accomodate non-rigid sheet samples 2%
inches (63mm) to four inches (102mm) in diameter and %
inch (6mml thick with excitation voltages up to IOOOV. The
Model 6105 has a UHF connector for the bias supply and a
BNC output to the Model 485. A test hook up using the
Model 247 power supply is shown in Figure 2-10.
MODEL* MODEL
32418 4801
CABLE
CABLE
m M~uHF~+C[~
NOT TO
EXCEED IOOOV
*Supplied with Model 247
Figure 2-10. Resistivity Test Set Up
2-10