FLUKE 1586A/1HC/C User Manual for the Fluke 1586A/1HC/C Super-DAQ Precision Temperature Scanner with high-capacity module

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1586A

Users Manual

3-6

3-Wire and 4-Wire Sense Input Configuration

For improved resistance measurement accuracy, the Product can connect to 3-wire (PRT

only) and 4-wire instruments with sense connections.

Sense connections cancel out the resistance of the test lead or wire and significantly

improves the accuracy of the measurement. As shown in Table 3-1, many thermistors,

platinum-resistance thermometers (PRTs) and resistors use a 3-wire or 4-wire sense

connection to eliminate lead wire resistance errors.

For 2-wire measurements, the wires can be connected to either the source or sense

channels ChX01 through ChX20. For 3-wire or 4-wire resistance measurements, the

source wires must be connected to channels ChX01 through ChX10 and the sense wires

to the set of terminals directly across from where the source is connected (channels

ChX11 through ChX20).

Note

The Product will not show or let the user select a 3-wire or 4-wire input on

channels ChX11 through ChX20.

Figure 3-3 shows an example of a 4-wire input (PRT) with sense wires connected to the

Input Module, then how it would look in the Channel Setup menu once it is properly

configured.

To use the sense connections, the channel connected to the source wires must be

configured as a 3-wire or 4-wire input as described in “Channel Configuration

Procedures” on page 3-10. When a channel is configured as a 3-wire or 4-wire input, the

Product automatically reserves the sense channel across from the source that prevents the

channel from being independently configured, as shown in Figure 3-3.

1.888.610.7664 sales@GlobalTestSupply.com

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FLUKE 1586A/1HC/C Super-DAQ Precision Temperature Scanner with high-capacity module