Fluke PM2811 User Manual page 63

Using your Programmable Power Supply
Local sensing mode:
Local sensing is used when the voltage across the load does not need to
compensate for the voltage drop across the load leads. This may be the case
when the following conditions exist:
• Short wires between the output channel and the load (R
• Low current through the connected load.
Figure 5.5.5 Connection of a Load in the Local Sense Mode
Remote sensing mode:
Remote sensing is used if the voltage accross the load must exactly match the
programmed value; remote sensing will namely compensate for the voltage drop
accross the load leads. This mode will be useful when the following conditions exist:
• Long leads between the output channel and the load (R
• High current through the connected load.
Figure 5.5.6 Connection of a Load in the Remote Sense Mode
Note that with remote sensing, the readback of the load voltage is monitored at
the load terminals. When using the remote sensing mode, it is necessary to twist
the sense wires to avoid disturbance and noise pickup in the sense input
terminals, which might cause instability of the output.
During remote sensing, the power supply can compensate for voltage drops up to
a specified minimum value. This is called the remote sense capability (see the
Reference Manual, Appendix A). When the voltage drop exceeds this value,
sense FAIL may occur. The output voltage and current are then reduced to zero
and the display shows the FAIL message.
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