Chapter 7 Tutorial
Connecting the Load
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7
Connecting the Load
Output Isolation
The outputs of all three power supplies are isolated from earth ground. Any output
terminal may be grounded, or an external voltage source may be connected between
any terminal output and ground. However, output terminals must be kept within ±240
Vdc of ground. The ± 25V supplies are tied together at one common terminal. Any
one of the three terminals can be tied to ground as needed. An earth ground terminal
is provided on the front panel for convenience.
Multiple Loads
When connecting multiple loads to the power supply, each load should be connected
to the output terminals using separate connecting wires. This minimizes mutual
coupling effects between loads and takes full advantage of the low output impedance
of the power supply. Each pair of wires should be as short as possible and twisted or
shielded to reduce lead inductance and noise pick-up. If a shield is used, connect one
end to the power supply ground terminal and leave the other end disconnected.
If cabling considerations require the use of distribution terminals that are located
remotely from the power supply, connect output terminals to the distribution terminals
by a pair of twisted or shielded wires. Connect each load to the distribution terminals
separately.
Table 7-1. Wire Rating
Warning To satisfy safety requirements, load wires must be heavy enough not to overheat
while carrying the short-circuit output current of the power supply.
AWG 10 12 14 16 18 20 22 24 26 28
Suggested
maximum
Current(amps)*
40 25 20 13 10 7 5 3.5 2.5 1.7
mΩ/ft 1.00 1.59 2.53 4.02 6.39 10.2 16.1 25.7 40.8 64.9
mΩ/m 3.3 5.2 8.3 13.2 21.0 33.5 52.8 84.3 133.9 212.9
*Single conductor in free air at 30 °C with insulation
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