Section 3. Load Connection and Sensing
Load Connection
Load Wiring Length for Operation With Sense Lines
For applications using
remote sensing, you must limit the voltage drop across each load line. See
Figure 3.1
for some maximum allowable lengths for a given load current and wire size. We
recommend that you use the larger load wiring to ensure a smaller voltage drop
(0.1 V typical maximum), although units can compensate for up to 0.5 V drop in
each line
1
.)
Figure 3.1
Maximum Wire Length for 100 mV Line Drop
Noise and Impedance Effects
To minimize noise pickup or radiation, use
shielded pair wiring of the shortest possible length for load wires. Connect the shield
to the chassis via the front panel binding post or a rear panel mounting screw. Where
shielding is impossible or impractical, simply twisting the wires together will offer
some noise immunity.
1.
Any losses in the load cables must be deducted from the maximum output
voltage of the supply. For example, a 15 V supply with a 1 V loss in the load
cables can supply a maximum of 14 V regulated at the load.
15
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