Keithley 8009 Instruction Manual - page 19
temperature and relative humidity using a type-K thermocouple (included with
Model 6517), and the optional Model 6517-RH relative humidity probe.
The information presented in sections 2.2 through 2.8 covers all aspects of opera-
tion in detail. Section 2.9 integrates the operating information together to provide
a short, but comprehensive procedure to make resistivity measurements. Section
3.3 provides resistivity nomographs that can be used to approximate resistivity.
2.2
ASTM standard
Methods, recommendations and calculations used in this manual to make
resistivity measurements are based on the following ASTM Standard:
American Society for Testing and Materials, Standard Methods of
Test for Electrical Resistance of Insulation Materials, ASTM
Designation D257
2.3
Insulator sample mounting
The minimum and maximum sample sizes are listed in the specifications.
NOTE
Do not handle the insulator sample with bare fingers. Body oil
will provide a conductive path and may corrupt the measure-
ment. The use of acetate rayon gloves is recommended. For
best results, clean the sample surfaces with an alcohol and
ether mixture or other suitable solvent.
Perform the following steps to mount the insulator sample in the Model 8009:
1. The top electrode in the Model 8009 is permanently attached to the top
cover. A test sample is provided with the Model 8009 to protect the
electrodes (this sample can be used for a functional check of the Model
8009). Remove the test sample. When finished, reinstall the test sample to
protect the electrode surfaces from nicks and scratches.
2. Center the insulator sample between the top and bottom electrodes of the
Model 8009. Make sure there are no conductive paths between the electrodes
other than those through the sample.
3. Close the lid of the test fixture and secure the latch.
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