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12 | TAKING READINGS | GEOKON
TO READ TEMPERATURES USING AN OHMMETER:
1.
Connect an ohmmeter to the green and white thermistor leads coming from
the instrument. Since the resistance changes with temperature are large,
the effect of cable resistance is usually insignificant. For long cables a
correction can be applied equal to approximately 48.5Ω per km (14.7Ω per
1000') at 20 °C. Multiply these factors by two to account for both directions.
2.
Look up the temperature for the measured resistance in Appendix B. For the
4420HT refer to Appendix C.
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