3 - Installation

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 66309B/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.

24

22

20

18

16

14

12

Maximum Ampacity (in

free air)

3.52

5.0

8.33

15.4

19.4

31.2

40

Resistance (at 20 deg. C)

Ω/mΩ/ft

0.0843

0.0257

0.0531

0.0162

0.0331

0.0101

0.0210

0.00639

0.0132

0.00402

0.0083

0.00252

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.

♦For best performance, 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.)

The load wires must also be of a diameter large enough to avoid excessive voltage drops due to the impedance of the wires. In general, if the wires are heavy enough to carry the maximum short circuit current without overheating, excessive voltage drops will not be a problem.

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Agilent Technologies 66311B, 66309B, 66111A manual Output Connections, Current Ratings, Voltage Drops and Lead Resistance
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66111A, 66309B, 66311B, D specifications

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