Fluke PM2813 - Local and Remote Sensing

5 - 10 Users Manual
5.5.2 Local and remote sensin
g
All models have the ability to sense the output volta
g
e locally or remotely. The
wires between an output channel and the connected load have a resistance,
which causes a volta
g
e drop. If the volta
g
e drop is not acceptable, remote sensin
g
must be applied.
The formula to calculate the volta
g
e drop is V
drop
= I
load
x R
lead
:
• V
drop
= the total volta
g
e drop of both wires
• I
load
= the current throu
g
h the load
• R
lead
= the total resistance of both wires between the power supply and the
load
Fi
g
ures 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 makin
g
any chan
g
es 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
followin
g
dia
g
ram). This means that all output channels have the local or remote
sensin
g
feature. The load is supplied with power (volta
g
e and/or current) throu
g
h
the output terminals -V and + V. The readback of the output volta
g
e is done
throu
g
h the input terminals -S and + S.
+S
+V
V
S
R
1
2
lead
R
2
1
lead
R
load
ST5836
Fi
g
ure 5.5.4 Volta
g
e drop due to Wire Resistance R
lead
.