10 TEGAM WAY • GENEVA, OHIO 44041 • 440
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466
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6100 • FAX 440
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466
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6110
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3-2
OPERATING INSTRUCTIONS
3.2
General Theory Of Operation
Measurement Principle
A 4-terminal measurement method is used to determine the
resistance of the item under test. This method allows the
accurate measurement of low values of resistance in spite of
the other resistances present in the connection leads. A
known current is supplied to the item under test via two wire
leads connected to the +I and -I binding posts on the R1L-B
Microohmmeter front panel. Two other wire leads connected
to the +E and -E binding posts on the R1L-B front panel
sense the voltage developed across the resistance under test
due to the supplied known current. The R1L-B then calculates
the resistance of the item under test utilizing Ohm's law, and
displays it on a 3 ½ digit display.
Kelvin Klip Cable Description
A Kelvin clip consists of two opposing jaws of an alligator
style clip which are insulated from each other, so one jaw may
be used to connect a source of current to the resistance
under test, and the other jaw used to measure the voltage at
the test point. The two jaws are spring loaded to clamp onto
a cylinder of ½ inch diameter or less.
WARNING
OPERATING THE R1L-B MICROOHMMETER AND TAKING
RESISTANCE MEASUREMENTS ON A POWERED OR
ENERGIZED COMPONENT COULD CAUSE SERIOUS HARM
TO THE OPERATOR AND/OR DAMAGE THE R1L-B. BE
SURE THE ITEM TO BE MEASURED IS DISCONNECTED
FROM OTHER COMPONENTS AND APPARATUS.
If the battery cells have not been installed, refer to section
2.2. Battery only operation will result in the most stable and
accurate readings. The R1L-B may be operated while
charging the batteries, however it will not conform to
specifications in this configuration.
