4-Wire Sense Connections; Wiring - Keysight N6705C Operating And Service Manual

2 Installation

4-Wire Sense Connections

Wiring

Open Sense Leads
Over-Voltage Protection Considerations
Output Noise Considerations
Wiring
The power analyzer includes built-in relays that connect or disconnect the ± sense terminals from
their corresponding ± output terminals. As shipped, the sense terminals are internally connected to
the output terminals. This is referred to as Local sensing.
4-wire, or remote sensing improves the voltage regulation at the load by monitoring the voltage at the
load rather than at the output terminals. This automatically compensates for the voltage drop in the
load leads, which is especially useful for CV operation with load impedances that vary or have
significant lead resistance. Because remote sensing is independent of other power analyzer functions,
it can be used regardless of how the instrument is programmed. Remote sensing has no effect during
CC operation
The following figures illustrate load connections using local sensing (A), and 4-wire remote sensing
(B). When the 4-wire indicator above the sense terminals is on, it indicates that the sense terminals
must be connected to the load.
1. Twist leads
2. 4-wire disabled
(indicator is off)
3. 4-wire enabled
(indicator is on)
Connect the load to the output 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.
62 Keysight N6705C Operating and Service Guide