Fluke Calibration 5730A Operator's Manual page 90

5730A
Operators Manual
In resistance output, the selections available at the bottom are:
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In the resistance function, two features are available to enhance accuracy: four-wire
sensing and two-wire compensation. Two-wire compensation works with either a two-
wire connection or a four-wire connection to a two-wire ohmmeter. A full explanation
follows:
Four-wire connection is available for all resistance values except 100 MΩ.To activate
four-wire resistance, turn External Sense on. (Figure 4-4A shows the four-wire
connection.)
For calibrating a meter with a two-wire resistance mode such as a typical handheld digital
multimeter (DMM), refer to Figures 4-4B through 4-4D. For resistances of 19 kΩ or
lower in two-wire mode, compensation circuitry inside the Calibrator is available to
remove errors introduced by resistance in the path between the front panel terminals and
the precision resistor. The 2-wire Compensation item is shown at the bottom of the
display when resistances of 19 kΩ or lower are selected. This selection lets the
compensation circuitry be disabled and enabled.
Depending on how the meter is connected, two-wire compensation referenced at the UUT
terminals (Figure 4-4C) or at the Calibrator terminals (Figure 4-4D) can be used.
Figure 4-4B shows a meter connected in a two-wire connection with the two-wire
compensation circuitry turned off. Use this configuration only if lead resistances are
insignificant. For a two-wire connection, turn External Sense off.
For resistances where uncompensated lead resistances are significant, use the two-wire
compensation circuit and the connection in Figure 4-4C or 4-4D. Use the connection in
Figure 4-4C to calibrate the meter referenced at its terminals. Use the connection in
Figure 4-4D to calibrate the meter referenced at the ends of its test leads.
4-26
External Sense
External Guard
2-wire Compensation
Wideband
Setup Menu