Input Connections; Connect The Power Cord; Output Connections; Wire Considerations - Agilent Technologies 6631B User Manual

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 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 (refer to the list at
the back of this guide) to obtain the correct cord.
NOTE: The detachable power cord may be used as an emergency disconnecting device. Removing
the power cord from the ac input connector will disconnect ac input power to the unit.

Output Connections

The output terminal block has connections for the + and − output, the + and − sense inputs, and an earth
ground terminal. The terminal block screws are 6-32 X 3/8 inch. Remove the safety cover by inserting a
flat bladed screwdriver in the opening on the left side of the cover and pushing the locking tab to the left.
This will release the cover.
Optional front panel binding posts are available to connect load wires for bench operation. The front
panel binding posts are paralleled with the rear panel + and − connections. Before using the front panel
binding posts, make sure that the output terminals are jumpered for local sensing.
NOTE: Front panel binding posts are provided for convenience. Only the rear panel terminals are
optimized for noise, regulation, and transient response as documented in Appendix A.

Wire Considerations

To minimize the possibility of instability on the output,
keep load leads as short as possible
♦
bundle or twist the leads tightly together to minimize inductance
♦

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. If there is more than one
load, then any pair of load wires must be capable of safely carrying the full-rated 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.
20
18
16
14
12
Ampacity (in free air)
8.33
15.4
19.4
31.2
40
Resistance (at 20 deg. C)
Ω Ω Ω Ω /m
0.0345
0.0217
0.0137
0.0086
0.0054
Installation - 3
Ω Ω Ω Ω /ft
0.01054
0.00663
0.00417
0.00262
0.00165
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