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Usin
g
your Pro
g
rammable Power Supply 5 - 11
Local sensin
g
mode:
Local sensin
g
is used when the volta
g
e across the load does not need to
compensate for the volta
g
e drop across the load leads. This may be the case
when the followin
g
conditions exist:
• Short wires between the output channel and the load (R
load
>
R
lead
).
• Low current throu
g
h the connected load.
Remote sensin
g
mode:
Remote sensin
g
is used if the volta
g
e accross the load must exactly match the
pro
g
rammed value; remote sensin
g
will namely compensate for the volta
g
e drop
accross the load leads. This mode will be useful when the followin
g
conditions exist:
• Lon
g
leads between the output channel and the load (R
load
≤
R
lead
).
• Hi
g
h current throu
g
h the connected load.
Note that with remote sensin
g
, the readback of the load volta
g
e is monitored at
the load terminals. When usin
g
the remote sensin
g
mode, it is necessary to twist
the sense wires to avoid disturbance and noise pickup in the sense input
terminals, which mi
g
ht cause instability of the output.
Durin
g
remote sensin
g
, the power supply can compensate for volta
g
e drops up to
a specified minimum value. This is called the remote sense capability (see the
Reference Manual, Appendix A). When the volta
g
e drop exceeds this value,
sense FAIL may occur. The output volta
g
e and current are then reduced to zero
and the display shows the FAIL messa
g
e.
+S
+V
V
S
R
load
ST5837
Fi
g
ure 5.5.5 Connection of a Load in the Local Sense Mode
+S
+V
V
S
R
load
ST5847
Fi
g
ure 5.5.6 Connection of a Load in the Remote Sense Mode