4-wire sense connection
SHOCK HAZARD
Turn off AC mains before making rear panel connections. All wires and straps must be properly connected with
the terminal block screws securely tightened.
SHOCK HAZARD
Floating voltage must not exceed 240 V
DC
. The total voltage on the input terminal and the floating voltage
must not be more than 240 V
DC
from chassis ground.
The electronic load includes built-in relays that connect or disconnect the ± sense terminals from their
corresponding ± input terminals. As shipped, the sense terminals are internally connected to the input terminals.
This is referred to as 2-wire, or local sensing.
4-wire, or remote sensing improves the voltage regulation at the load by monitoring the voltage at the DUT rather
than at the load input terminals. This automatically compensates for the voltage drop in the load leads, which is
especially useful for CV operation with load impedance that vary or have significant lead resistance. Remote voltage
sensing also provides greater accuracy when using voltage readback in all operating modes. Because remote
sensing is independent of other load functions, it can be used regardless of how the instrument is programmed.
Remote sensing has no effect during CC operation.
The following figures illustrate DUT connections using 2-wire sensing and 4-wire sensing.
Connect the DUT to the input terminals using separate connecting wires. Keep the wire-pair as short as possible
and twist or bundle it to reduce lead inductance and noise pickup. Keep the load leads under 14.7 meters (50 feet)
per lead because of inductance effects.
Connect the sense leads as close to the DUT as possible. Do NOT bundle the sense wire-pair together with the load
leads; keep the load wires and sense wires separate. The sense leads carry only a few milliamperes of current and can
be a lighter gauge than the load leads. However, any voltage drop in the sense leads can degrade the voltage
regulation of the instrument.
After turning the unit on, activate 4-wire remote voltage sensing by pressing Source Settings > Sense 4w. Refer to
Specifying 2-Wire or 4-Wire Sense.
Keysight EL30000 Series User's Guide 39
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