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Berkeley COMPSCI 150 - Lab Lecture 4: Using Test Equipment

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1CS150 Lab Lecture 4:Using Test EquipmentJason HuFall 2001OverviewXTest Equipment IntroductionXLab Hints2Past LabsXLoad circuits onto Xilinx and everything worksXWhat if there are problems?XTime for debugging/test equipment!Test EquipmentXHP E3630A Triple-Output Power SupplyXFluke 8010A Digital MultimeterXHP 8112A Pulse GeneratorXHP 54645D 100 MHz Mixed Signal Oscilloscope3HP E3630AXPower SupplyX3 output voltagesX+6V, +20V, –20VHP E3630APress ‘meter’ buttons for voltagesSet Tracking Ratio to rightUse knobs to set voltageUse leads with COMAnd the correct voltage4HP E3630AXDon’t directly connect COM to voltageXLarge current will flowXP = I2R means resistors and wires will fryXAs a safety feature, current is limitedFluke 8010A Digital MultimeterXMeasures AC/DC Voltage, Current, and ResistanceXMore accurate than the power supply display5Measuring VoltageXPress V buttonXConnect Common to ground, and V/kΩ/Sto voltage to measureXConnect probes inparallelMeasuring CurrentXPress mA buttonXConnect black lead to CommonXConnect red lead to ma (0-2000 ma) or 10A (0-10A) XConnect in series to measure current6Measuring ResistanceXPress kΩ/S buttonXConnect black lead to CommonXConnect red lead to V/kΩ/SXDevice must be removedfrom circuit beforemeasurementAdjust Measurement ScaleXAdjust the scale based on the range of values you expect7HP 8112A Pulse GeneratorXGenerate single or period square waveformsXCan vary voltages, periods, duty cycles, pulse widths, and slew ratesChanging ValuesSet Mode to NormCTRL to nothingUse PER for periodDTY is duty cycleWID is pulse widthHIL set high voltageLOL sets low voltage8Adjusting ValuesXUse Vernier to change value of each digitXRange changes magnitudeXMake sure disable is offXUse shown probeXHas two leadsOscilloscopesXCan show analog signals and digital signals from Xilinx pinsXValuable ResourceXUseful on projectXUse soft menusto navigate9Analog InputsXTwo analog inputsXVolts/Div knobs sets Y axisXAuto-scale (white button)does a lot of work for youXCan get exact measurements for voltage, time, etcXUse buttons, then follow menusTriggeringXTriggering determines when to catch and display signalsXTrigger menus for manual adjustmentGood TriggeringBad Triggering10Digital InputsX16 inputsXInput knob selects pinXMain method of seeing XXilinx signalsXCareful when attaching pinsXDon’t bend pinsDigital TriggeringXPattern matchingXCheck signal for High, Low, Positive Edge, Negative Edge, or don’t careXFor project, useful to labelpins so easier to identify11Save/RecallXStore sweeps of dataXSingle gets one sweepXRun/Stop freezes current outputXAuto-store stores on triggersLab 4XMeasure Power Supply VoltageXObserve Pulse Generator with ScopeXBoth basic operations described earlier12Rest of LabXDownload two ROM circuitsXFirst circuit repeatedly outputs 3 16 bit outputsXUse trigger and storage to capture informationX1 output is known, so it can be used as a reference to determine exact contents of other two outputsRest of LabXSecond circuit used to measure propagation delayXLogic analyzer used to measure worst-case delayXUse triggers to mark when worst case transition occursXDelay can be measured off


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Berkeley COMPSCI 150 - Lab Lecture 4: Using Test Equipment

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