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4165 Operations
The guidelines below should be followed for taking measurements using the Model 4165 Contact
Resistance Ohmmeter:
1) Select the 50mV maximum open-circuit voltage. This limits the maximum voltage that will
be present at the CURRENT terminals in a no load situation to ensure a dry measurement.
2) Select the 20KΩ range.
3) Connect the test leads to the ohmmeter as described in 6-2.
4)
Zero Adjustment. This adjustment may be performed at any time but does not need to be
performed before each measurement. To make the adjustment, select the 200Ω range and
connect the ohmmeter to a precision 0.1Ω resistor. Adjust the front panel ZERO
potentiometer so that the display indicates 000.10.
5) Connect the test leads to the load using a 4-wire configuration.
6) Select the most precise reading by downranging the ohmmeter until the display flashes
(indicating an overrange condition) and then moving back up one range.
7) Select the 2V clamp. The resistance reading will be indicated on the display. It is
recommended that the OPEN-CIRCUIT VOLTAGE selector be placed in the 50mV
position before changing ranges or disconnecting the test leads.
4165-1344 Operations
The guidelines below should be followed for taking measurements using the Model 4165-1344
Contact Resistance Ohmmeter:
1) Select the 20mV maximum open-circuit voltage. This switch limits the maximum voltage
that will be present at the CURRENT terminals in a no load situation to ensure a dry
measurement.
2) Select the 20KΩ range.
3) Connect the test leads to the ohmmeter as described in 6-2.
4)
Zero Adjustment. This adjustment may be performed at any time but does not need to be
performed before each measurement. To make the adjustment, select the 200Ω range and
connect the ohmmeter to a precision 0.1Ω resistor. Adjust the front panel ZERO
potentiometer so that the display indicates 000.10.
5) Connect the test leads to the load using a 4-wire configuration.
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