User`s guide

3 - Installation
28
Input Connections
Connect the Power Cord
1. Unscrew the line fuse cap from the rear panel and verify that the fuse rating matches what is
specified on the FUSES label on the rear panel. Reinstall the fuse. (See table 3-1 for fuse part
numbers.)
2. 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).
Output Connections
Turn the unit off before connecting any wires.
The output connector 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.
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
Voltage Drops and Lead Resistance
To optimize the performance and transient response in your test system, please observe the following
guidelines:
♦ Twist the load leads together and keep them short. The shorter the leads, the better the performance.
♦ When remote sensing, twist the sense leads together but do not bundle them in with the load leads.
♦ Keep the total cable length to 18 inches or less when local sensing.
♦ Keep the total cable length to the load to 20 ft or less when remote sensing. (Note that the unit has
been tested with cable lengths of up to 40 feet.)