Keysight Technologies N6700 User Manual

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Keysight Technologies N6700 User Manual Manual pdf 32 page image

2 Installation32 Keysight N6700 User’s GuideWire SizeWARNING FIRE HAZARD Select a wire size large enough to carry short-circuitcurrent without overheating (refer to the table below). To satisfy safetyrequirements, load wires must be heavy enough not to overheat whilecarrying the short-circuit output current of the unit. Keysight ModelN678xA SMU wiring requirements are described on the following page.Along with conductor temperature, you must also consider voltage dropwhen selecting wire sizes. The following table lists the resistance forvarious wire sizes and the maximum lengths to limit the voltage drop to1.0 V per lead for various currents.Note that the minimum wire size required to prevent overheating maynot be large enough to prevent over-voltage tripping or maintain goodregulation. Under most conditions, the load wires should also be heavyenough 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 awire size sufficient to handle the FULL output current of the unit nomatter what the intended load current or current limit settingLoad lead resistance is also an important factor relating to the CVstability of the instrument when remote sensing capacitive loads. If highcapacitance loads are expected, you should not use wire gauges heavierthan 12 to 14 AWG for long runs of load lead.Wire size Current-carrying capacity in Ampsfor stranded copper wireResistance Max. Length to Limit Voltage to 1 V/Leadfor 5 A for 10 A for 20A for 50AAWG 2 wires bundled 4 wires bundled Ω/foot Wire length in feet20 7.8 6.9 0.0102 20 x x x18 14.5 12.8 0.0064 30 15 x x16 18.2 16.1 0.0040 50 25 x x14 29.3 25.9 0.0025 80 40 20 x12 37.6 33.2 0.0016 125 63 30 x10 51.7 45.7 0.0010 200 100 50 208 70.5 62.3 0.0006 320 160 80 326 94 83 0.0004 504 252 126 50Area in mm2 2 wires bundled 4 wires bundled Ω/meter Wire length in meters0.5 7.8 6.9 0.0401 5 x x x0.75 9.4 8.3 0.0267 7.4 x x x1 12.7 11.2 0.0200 10 5 x x1.5 15.0 13.3 0.0137 14.6 7.2 x x2.5 23.5 20.8 0.0082 24.4 12.2 6.1 x4 30.1 26.6 0.0051 39.2 19.6 9.8 3.96 37.6 33.2 0.0034 58 29 14.7 5.910 59.2 52.3 0.0020 102 51 25 10.3Notes: 1. Capacity for AWG wires derived from MIL-W-5088B. Max. ambient temp: 55°C. Max. wire temp: 105°C.2. Capacity for metric wires are derived 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, orbundled together and less than 50 feet (14.7 meters) in length per lead.