Agilent Technologies 6814B, 6834B, 6843A manual Wire Considerations, Voltage Drops, Current Ratings

Page 19

Installation - 2

NOTE: 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

Wire Considerations

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 ac 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 ac source.

Table 2-1 lists the characteristics of AWG (American Wire Gage) copper wire.

Table 2-1. Ampacity and Resistance of Stranded Copper Conductors

AWG No.

14

12

10

8

Ampacity1

25

30

40

60

Resistance2

(Ω/m)

0.0103

0.0065

0.0041

0.0025

AWG No.

6

4

2

1/0

Ampacity1

80

105

140

195

Resistance2

(Ω/m)

0.0016

0.0010

0.00064

0.00040

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)

Temp. (°C)

21-25

1.08

41-45

0.71

26-30

1.00

46-50

0.58

31-35

0.91

51-55

0.41

36-40

0.82

 

 

2. Resistance is nominal at 75 °C wire temperature.

Voltage Drops

The load wires must also be 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. The voltage drops across the load wires should be limited to less than 2% of the output voltage.

Refer to Table 2-1 if you need to calculate the voltage drop for some commonly used AWG copper wire.

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Contents User’s Guide AC Power Solutions Agilent Models 6814B, 6834B, and 6843ACertification Warranty InformationGeneral Safety SummarySafety Symbols EMC DeclarationPrinting History Acoustic Noise InformationTable of Contents Entry Keys Examples of Front Panel Programming Specifications Supplemental CharacteristicsPerforming the Calibration Procedure Error Number ListTopic Document OrientationLocation Agilent Part Number Safety ConsiderationsOptions, Accessories, and User Replaceable Parts Option DescriptionCapabilities DescriptionModel Description Front Panel/Remote Operation Output CharacteristicRanges Output VA Capability AC Source Output Characteristic in real-time modePage Items Supplied CleaningInspection Damage Packaging MaterialNot block the fan exhaust at the rear of the unit LocationBench Operation Rack MountingInput Connections Installing the Power CordInput Source and Line Fuse Output Connections Output ConnectionsAmpacity and Resistance of Stranded Copper Conductors Wire ConsiderationsVoltage Drops Current RatingsRemote Sense Connections Remote Sense ConnectionsOutput Rating Trigger ConnectionsDigital Connections OVP ConsiderationsController Connections Gpib ConnectorRS-232 Data Format Interface CommandsRS-232 Connector RS-232 InterfaceNull Modem Interface Lines Response Data Terminator Hardware HandshakePreliminary Checkout IntroductionCheckout Procedure Using the KeypadVolt Procedure Display ExplanationProtclear Currprot OFF VoltprotCurrlev CurrprotCase of Trouble Error MessagesLine Fuse Page Front Panel, Overall View Front Panel DescriptionAC+DC System Keys Display Command FunctionFunction Keys Annunciator On Phase SelectedImmediate Action Keys KBESSEL, Rect Scrolling KeysMeter Display Keys Display MeasurementDisplay Output Control KeysRST CLS Protection and Status Control KeysAbort Trigger and List Control KeysInitimmed IMMThrough Are used for entering numeric values Is the decimal Entry KeysSet the output to 120 V rms as follows Setting the Output Voltage AmplitudeProcedure for Single-Phase AC Sources Examples of Front Panel ProgrammingTo verify the output, you can measure it as follows Procedure for Three-Phase AC SourcesPhase 3 to 235 Vrms Action DisplaySetting a Protection Feature Setting the Output FrequencyOvercurrent protection feature as follows Voltm Step Using Transient Voltage ModesStep Transient VolttDcycle Pulse TransientVoltm Pulse WidthAction List TransientVoltm Fixed Voltm List Count Volt EOL Step Auto Trigger Delays and Phase SynchronizationExample Display Syncsour PhaseSyncphas Initimmed Example Voltm Step Syncsour Phase Syncphas InitimmedProgramming Slew Rates Using Slew Rates to Generate WaveformsSlewt Voltm FixedSlew Step SlewmCurrpeak Syncsour Phase SyncphasMeasuring Peak Inrush Current RangeAction Display To set the Gpib address, proceed as follows Setting the Gpib Address and RS-232 ParametersTo configure the RS-232 interface, proceed as follows Saving and Recalling Operating StatesAddress Noutputs Table A-1. Performance Specifications1 SpecificationsAgilent 6814B Agilent 6834B Agilent 6843A Table A-2. Supplemental Characteristics Supplemental CharacteristicsSpecifications a Page Equipment Required CharacteristicsRecommended Model Turn-On Checkout Procedure Test SetupPerforming the Verification Tests RMS Current Readback Accuracy Voltage Programming and Measurement AccuracyAction Normal Result Agilent 6843A Current Measurement Accuracy Performing the Calibration ProcedureAgilent 6814B Current Measurement Accuracy Agilent 6834B Current Measurement AccuracyFront Panel Calibration Enable Calibration ModeFront Panel Calibration Menu Calibrating the OVP trip point Calibrating and Entering Voltage Calibration ValuesCalibrating and Entering Current Calibration Values Calpass Changing the Calibration PasswordCalibrating the Output Impedance Agilent 6843A only Saving the Calibration ConstantsAgilent Calibration Program Listing Calibration Error MessagesTable B-3. Gpib Calibration Error Messages Calibration Over the GpibFigure B-2. Calibration Program Listing Sheet 1 Figure B-2. Calibration Program Listing Sheet 2 Page Table C-1. Error Numbers Error Number ListError Messages Error Messages C Page Index Index Index Japan United States Latin AmericaCanada Australia/New Zealand Europe Asia PacificManual Updates
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