Local And Remote Sensing - Fluke PM2811 User Manual

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5.5.2

Local and remote sensing

All models have the ability to sense the output voltage locally or remotely. The
wires between an output channel and the connected load have a resistance,
which causes a voltage drop. If the voltage drop is not acceptable, remote sensing
must be applied.
Figure 5.5.4 Voltage drop due to Wire Resistance R
The formula to calculate the voltage drop is V
• V = the total voltage drop of both wires
drop
• I = the current through the load
load
• R = the total resistance of both wires between the power supply and the
lead
load
Figures 5.5.5 and 5.5.6 show the difference between a local and remote
connection has been indicated.
CAUTION: To prevent shock or short-circuit you must set the power supply to
the standby mode before making any changes in the output
channel connections or you must disable the output channel (only
possible for multiple output models).
All the models and their output channels have the same terminal block (see the
following diagram). This means that all output channels have the local or remote
sensing feature. The load is supplied with power (voltage and/or current) through
the output terminals -V and + V. The readback of the output voltage is done
through the input terminals -S and + S.
1
R
lead
2
+S
+V
V
S
1
R
lead
2
R
load
ST5836
.
lead
= I x R
drop load lead
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