Agilent Technologies E3631-90002, User Manual, Page: 146 / 166

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
W a r n i n g
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
m
9
/ft 1.00 1.59 2.53 4.02 6.39 10.2 16.1 25.7 40.8 64.9
m
9
/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