Section 3: Measuring 4-wire resistance with offset compensation
Model DMM7510 7½ Digit Multimeter Application Manual
3-2
DMM7510-904-01 Rev. D March 2021
Device connections
You can use either the front-panel or the rear-panel terminals for this application. The following
figures show the physical connections for the front and rear panels. Note that you must use either the
front terminals or the rear terminals. You cannot mix front and rear connections.
Make sure that the front-panel TERMINALS switch is set to the terminals you are using. When
F
is
displayed next to the switch, the instrument is reading the front-panel terminals.
R
indicates that the
instrument is reading the rear-panel terminals.
The front-panel and rear-panel connections are both safety banana jacks.
To use the 4-wire connection method:
1. Connect one set of test leads to the INPUT HI and INPUT LO terminals.
2. Connect the other set of test leads to the SENSE HI and SENSE LO terminals.
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 power before connecting DUTs. 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 DMM7510. 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. Failure to recognize and observe
normal safety precautions could result in personal injury or death.
