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3 - Installation
28
Input Connections
Connect the Power Cord
Connect the power cord to the IEC 320 connector on the rear of the unit. If the wrong power cord was
shipped with your unit, contact your nearest Agilent Sales and Support Office to obtain the correct cord
(refer to the list at the back of this guide).
Check the line voltage rating label on the back of the unit to make sure that it agrees with your ac mains
voltage. Refer to appendix E if the voltage at your site is different from the voltage indicated on the unit.
Output Connections
Turn the unit off before connecting any wires.
Output 1
The main output connector (output 1) has a termination for the + and − output, the + and − sense
terminals, and an earth ground terminal. The 5-pin connector is removable and accepts wires sizes from
AWG 22 to AWG 12. Disconnect the mating plug from the unit by pulling it straight back.
IMPORTANT: You must connect the sense terminals on Output 1 for the unit to operate properly. Refer
to the section on "Open Sense Lead Protection" in this chapter. Install the connector plug
with its supplied sense jumpers before applying power to the unit.
Output 2
Agilent 66319B/D units have a second output connector (output 2). It has the same configuration as the
main output connector. It has a termination for the + and − output, the + and − sense terminals, and an
earth ground terminal. The 5-pin connector is removable and accepts wires sizes from AWG 22 to AWG
12. Disconnect the mating plug from the unit by pulling it straight back. You must connect the sense
terminals on Output 2 for the unit to meet its published specifications.
Current Ratings
Fire Hazard To satisfy safety requirements, load wires must be large enough not to overheat when
carrying the maximum short-circuit current of the dc source.
The following table lists the characteristics of AWG (American Wire Gage) copper wire.
Table 3-2. Ampacity and Resistance of Stranded Copper Conductors
AWG No. Maximum Ampacity (in
free air)
Resistance (at 20 deg. C)
Ω
ΩΩ
Ω/m
Ω
ΩΩ
Ω/ft
24 3.52 0.0843 0.0257
22 5.0 0.0531 0.0162
20 8.33 0.0331 0.0101
18 15.4 0.0210 0.00639
16 19.4 0.0132 0.00402
14 31.2 0.0083 0.00252
12 40 0.0052 0.00159