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Keysight N6705C Mode D'emploi page 59

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Note that the minimum wire size required to prevent overheating may not be large enough to prevent
over-voltage tripping or maintain good regulation. Under most conditions, the load wires should also
be heavy enough to limit the voltage drop to no more than l.0 V per lead.
To help prevent nuisance tripping of the over-voltage circuit, select a wire size sufficient to handle the
FULL output current of the unit no matter what the intended load current or current limit setting.
Load lead resistance is also an important factor relating to the CV stability of the instrument when
remote sensing capacitive loads. If high capacitance loads are expected, you should not use wire
gauges heavier than 12 to 14 AWG for long runs of load lead.
Wire Size
Metric size (Note1)
AWG
2 wires bundled
20
7.8
18
14.5
16
18.2
14
29.3
12
37.6
10
51.7
8
70.5
6
94
Area in mm 2
2 wires bundled
0.5
7.8
0.75
9.4
1
12.7
1.5
15.0
2.5
23.5
4
30.1
6
37.6
10
59.2
Notes:
1. Capacity for AWG wires from MIL-W-5088B. Maximum ambient temperature: 55°C. Maximum wire temperature: 105°C
2. Capacity for metric wires from IE Publication 335-1.
3. Capacity of aluminum wire is approximately 84% of that listed for copper wire.
4. "x" indicates wire is not rated for the maximum output current of the power module.
5. Because of wire inductance considerations, it is also recommended that you keep your load leads twisted, tie wrapped, or
bundled together and less than 50 feet (15.24 meters) in length per lead.
6. For models N679xA when reverse protection is activated, because of wire inductance considerations, wire lengths should
be twisted, tie wrapped, or bundled together and less than 100 feet (30.48 meters) in length per lead. The goal is to prevent
large voltage spikes by keeping the wire inductance below 1mH.
Keysight N6705C User's Guide
Resistance
4 wires bundled
Ω per foot
6.9
0.0102
12.8
0.0064
16.1
0.0040
25.9
0.0025
33.2
0.0016
45.7
0.0010
62.3
0.0006
83
0.0004
4 wires bundled
Ω per meter
6.9
0.0401
8.3
0.0267
11.2
0.0200
13.3
0.0137
20.8
0.0082
26.6
0.0051
33.2
0.0034
52.3
0.0020
Max length to limit voltage to 1 V/lead
for 5 A
for 10 A
for 20 A
Wire length in feext
20
x
30
15
50
25
80
40
125
63
200
100
320
160
504
252
126
Wire length in meters
5
x
7.4
x
10
5
14.6
7.2
24.4
12.2
6.1
39.2
19.6
9.8
58
29
14.7
102
51
2 Installation
for 50 A
x
x
x
x
x
x
20
x
30
x
50
20
80
32
50
x
x
x
x
x
x
x
x
x
3.9
5.9
25
10.3
59

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