INSTRUMENT RESISTANCE SPOILER

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The IRS-1 tests for reference electrode contact resistance. The IRS-1 switch is a portable push button device which momentarily changes the input impedance of a digital multimeter to 1MΩ from its normal value, typically 10MΩ. This feature permits the Corrosion Technician to detect high resistance in the external circuit, such as faulty test lead connections or high resistance contact between a reference electrode and the electrolyte.


The “normally-open” switch allows the meter to display voltage readings in normal operation, but reduces meter input impedance by a factor of 10 when the push button is depressed. If there is ±5% (or more) difference in the display reading, then there is a contact resistance error that requires correction.

Using the IRS-1 during potential surveys enhances performance by reducing the number of inaccurate readings. True potential values may be calculated to provide ‘true’ values in areas having a very dry, frozen, or high resistivity soil.

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