6½ Digit Multimeter User's Manual Section 6: Measuring 4-
wire resistance with offset compensation
DMM6500-900-01Rev. A / April 2018 6-3
3. Connect the INPUT HI and SENSE HI connections to one of the device-under-test (DUT) leads.
Connect the sense connection as close to the DUT as possible.
4. Connect the INPUT LO and SENSE LO to the other DUT lead. Connect the sense connection as
close to the DUT as possible.
To prevent electric shock, test connections must be configured such that the user cannot
come in contact with test leads or any device under test (DUT) that is in contact with the
conductors. It is good practice to disconnect DUTs from the instrument before powering the
instrument. Safe installation requires proper shields, barriers, and grounding to prevent
contact with test leads.
There is no internal connection between protective earth (safety ground) and the LO
terminals of the DMM6500. Therefore, hazardous voltages (more than 30 V
RMS
) can appear on
LO terminals. This can occur when the instrument is operating in any mode. To prevent
hazardous voltage from appearing on the LO terminals, connect the LO terminal to protective
earth (safety ground) if your application allows it. You can connect the LO terminal to the
chassis ground terminal on the front panel or the chassis ground screw terminal on the rear
panel. Note that the front-panel terminals are isolated from the rear-panel terminals.
Therefore, if you are using the front-panel terminals, ground to the front-panel LO terminal. If
using the rear-panel terminals, ground to the rear panel LO terminal. Failure to follow these
guidelines can result in injury, death, or instrument damage.
Measuring 4-wire resistance with offset compensation
This application demonstrates how to use the DMM6500 to measure the resistance of a device or
component. You can make this measurement from the front panel or over the remote interface using
SCPI or TSP code. For information about setting up remote communications, see
Remote
communications interfaces (on page 3-1).
For this application, you will:
• Reset the instrument.
• Select the 4-wire resistance function. This method eliminates the effect of the lead resistance on
measurement accuracy.
• Enable offset compensation.
• Make measurements from the front panel or the remote interface.
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