Agilent Technologies 668xA, 665xA, 664xA, 667xA User Connections, Rear Panel Connections All Models

4

User Connections

Rear Panel Connections (All Models)

Make application load connections to the output terminals or bus bars, analog connector, and digital connector as shown on the rear-panel drawing for your model power supply. These connections are organized by series as follows:

Series 664xA and 665xA

Series 667xA

Series 668xA and 669xA

Make controller connections (GPIB and serial link) as shown in Figure 4-6 at the end of this chapter.

Load Wire Selection (All Models)

Fire Hazard To satisfy safety requirements, load wires must be large enough not to overheat when carrying the maximum short-circuit current of the power supply. 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 supply. With the larger-capacity supplies (such as Series 668xA), use of two or more load wires in parallel may be required.

Table 4-1 lists the characteristics of AWG (American Wire Gauge) copper wire.

Table 4-1. Stranded Copper Wire Capacity and Resistance

AWG	Ampacityl	Resistance2	AWG	Ampacity1	Resistance2
No.		(Ω/m)	No.		(Ω/m)
14	25	0.0103	2	140	0.00064
12	30	0.0065	1/0	195	0.00040
10	40	0.0041	2/0	225	0.00032
8	60	0.0025	3/0	260	0.00025
6	80	0.0016	4/0	300	0.00020
4	105	0.0010

			NOTES:
1.	Ampacity is based on 30 °C ambient temperature with conductor rated at 60 °C. For ambient temperature other
	than 30 °C, multiply the above ampacities by the following constants:
	Temp (°C)	Constant		Temp (°C)	Constant
	21-25	1.08		41-45	0.71
	26-30	1.00		46-50	0.58
	31-35	0.91		51-55	0.41
2.	36-40	0.82
	Resistance is nominal at 75 °C wire temperature.

User Connections 59