Manuals / SRS Labs / Computer Equipment / Computer Hardware

SRS Labs manual SR850 Basics

Models: SR850

1 290

Download 290 pages 36.53 Kb

Page 78

SR850 Basics

3-24

Image 78

SRS Labs manual SR850 Basics

Contents

Model SR850 Page Table of Contents Table of Contents Safety and Preparation for USE Page Reference Channel SR850 DSP LOCK-IN Amplifier SpecificationsSignal Channel DemodulatorDisplays SR850 DSP Lock-In AmplifierInputs and Outputs Analysis FunctionsCommand List VariablesAUX INPUT/OUTPUT CursorMark MathFront Panel Controls SetupPrint and Plot Auto FunctionsInterface Standard Event Status Byte Error Status ByteStatus Byte Definitions StatusGetting Started Your First Measurements Key Types Hardkeys Softkeys KnobGetting Started Basic LOCK-IN Basic Lock-inBasic Lock-in Basic Lock-in Basic Lock-in Displays and Traces Displays and TracesDisplays and Traces Displays and Traces Displays and Traces Displays and Traces Displays and Traces OUTPUTS, Offsets and Expands Outputs, Offsets and ExpandsOutputs, Offsets and Expands Outputs, Offsets and Expands Outputs, Offsets and Expands Scans and Sweeps Scans and SweepsScans and Sweeps Scans and Sweeps Scans and Sweeps Scans and Sweeps Scans and Sweeps Using the Disk Drive Disk DriveStoring and Recalling Data Disk Drive Disk Drive Disk Drive Disk Drive Disk Drive Storing and Recalling Settings TEST1 AUX Outputs and Inputs Aux Outputs and InputsAux Outputs and Inputs Aux Outputs and Inputs Aux Outputs and Inputs Trace Math Trace MathTrace Math Right edge of the graph display. In this case Trace Math Trace Math Trace Math Trace Math Trace Math SR850 Basics What is a LOCK-IN AMPLIFIER? Why use a lock-in?What is phase-sensitive detection? Magnitude and phase Where does Lock-in reference come from?All lock-in measurements require a reference signal SR850 BasicsWhat does the SR850 measure? What does a LOCK-IN MEASURE?RMS or Peak? Degrees or Radians?SR850 Basics SR850 Functional Block Diagram Functional SR850PLL SR850 Basics Reference Channel Reference Oscillators and PhasePhase Jitter Reference InputHarmonic Detection Phase Sensitive Detectors PSDs Digital PSD vs Analog PSDSR850 Basics Digital Filters vs Analog Filters Time Constants and DC GainTime Constants Synchronous FiltersWhat about resolution? Long Time ConstantsDC Output Gain R and Output scales DC Outputs and ScalingCH1 and CH2 R Output Offset and ExpandTrace displays Trace output scalingSR850 Basics SR850 Basics What is dynamic reserve really? Dynamic ReserveDynamic reserve in the SR850 Minimum dynamic reserveSignal Input Amplifier and Filters Input noiseNotch filters Anti-aliasing filter Input ImpedanceDifferential Voltage Connection A-B Common Mode SignalsInput Connections Single-Ended Voltage Connection aCurrent Input AC vs DC CouplingShot noise Intrinsic Random Noise SourcesJohnson noise NoiseSR850 Basics External Noise Sources Capacitive couplingInductive coupling Resistive coupling or ground loops MicrophonicsThermocouple effects Noise Measurements How does a lock-in measure noise?Noise estimation Noise Power Button Front PanelVideo Display Front Panel Signal Inputs Ch1 & Ch2 OutputsFront Panel Soft Key Definitions Default DisplayStatus Activity Indicators Soft KeysTrace 1 Trace 2 Y Trace 3 R Screen DisplayData Traces AI1Single and Dual Trace Displays Screen Display BAR Graphs Plot of X and Y Signal VectorPolar Graphs ScaleStrip Charts Chart ScalingCursor Display Data ScrollingCursor MarksTrace SCANS, Sweeps & Aliasing Default Scan Starting and Stopping a ScanAliasing Effects Settings & INPUT/OUTPUT Monitor Menu Display Status Indicators SRQ ALTScreen Display Keypad Normal and Alternate KeysMenu Keys Additional Menus START/CONT and PAUSE/RESETKeypad Entry KeysCursor Active DisplayMark Cursor MAX/MIN Auto PhaseAuto Setup Auto ReserveHelp Print to a PrinterPrint to a Disk File LocalKeypad RS232 Connector Power Entry ModuleIEEE-488 Connector PC Keyboard ConnectorAUX in 1-4 A/D Inputs Rear Panel BNC ConnectorsRear Panel AUX OUT 1-4 D/A OutputsTrig Using SRS PreampsPreamp Connector TTL OUTRear Panel SR850 Menus Default Settings SR850 MenusAuto Phase Reference and Phase MenuReference Phase Reference PhaseReference and Phase Menu Reference SourceReference and Phase Menu Harmonic Sine Output Source Current Gain Input and Filters MenuInput and Filters Input FiltersInput and Filters Menu Grounding Coupling Line NotchesAuto Gain Gain and Time Constant MenuSensitivity Gain Time ConstantGain and Time Constant Menu ReserveMan Reserve Auto Reserve Time ConstantAnalog Outputs with Short Time Constants Filter dB/oct SynchronousGain and Time Constant Menu Output and Offset Menu Output and OffsetOutput Offset Output and Offset Menu Short Time Constant LimitationsTrace Scan Trace and Scan MenuTrace and Scan Trace 1, 2, 3 orTrace and Scan Menu Sample RateScan Length Shot or LoopTrace and Scan Menu Format Monitor Display Scale Display and Scale MenuDisplay and Scale Display ScaleDisplay and Scale Menu Display and Scale Menu Display and Scale Menu AUX Outputs AUX Outputs MenuAux Outputs Aux Out 1, 2, 3 orAux Outputs Menu Voltage Sweep LimitsTrigger Starts? Aux Outputs Menu Cursor Setup Cursor Setup MenuCursor Setup Cursor SeekCursor Setup Menu Cursor Width Vert Grid DivsCursor Control Cursor Readout Insert Mark Edit Mark MenuEdit Mark Edit MarkEdit Mark Menu Delete Mark Cursor to Next Cursor to PreviousMath Keys Math MenuMath MathMath Menu Smooth PointReturn Fit Math MenuDo Fit Type of Fit View Parameters Line Fit Exp. FitGauss. Fit Left and Right Limit Limit MarkersMath Menu Calc Do CalcOperation Argument Type Math Menu Stats Do StatsDisk Keys Disk MenuDisk DiskDisk Menu Save DataTest 85S SET Recall Data Data Recall File Name Save Settings Recall Settings Disk Utilities Setup Keys System Setup MenuSystem Setup System SetupSystem Setup Menu Settings Settings KeysSystem Setup Menu Output to RS232/GPIBSetup RS232 Setup GpibView Queues System Setup Menu Setup Sound AlarmsKey Click Setup Plotter Plot ModePlot Speed Define Pens Setup Printer Printer TypeSystem Setup Menu Setup Screen Move Right Move Left Move Up Move Down ReturnSetup Time TimeDate System Setup Menu Plot Trace PlotPlot All Plot CursorSystem Setup Menu Info System Setup Menu System Setup Menu Test Hardware Keypad Test Keyboard TestKnob Test Memory Test Disk Drive TestRS-232 Test Screen Test Printer TestRemote Programming Remote Programming Interface Ready and StatusGET Group Execute Trigger Detailed Command List RememberRemote Programming Reference and Phase Commands Harm ? Slvl ?Remote Programming Input and Filter Commands Rmod ? Remote Programming Gain and Time Constant CommandsSens ? Rsrv ?Ofsl ? Sync ?Oexp ? i , x, j Remote Programming Output and Offset CommandsFout ? i , j AoffRemote Programming Trace and Scan Commands TrigRemote Programming Display and Scale Commands AsclDhzs ? i , j RBIN?Cmax Cursor CommandsCsek ? Cwid ? Cdiv ? Clnk ? Cdsp ? CURS?Cprv Mark CommandsCnxt MdelRemote Programming AUX Input and Output Commands OAUX? Auxm ? i , j Auxv ? i Saux ? i , x, y, z Tstr ?Math Commands SmthCopr ? Calc Store and Recall File Commands Setup Commands Pncr ? Pngd ?Pnal ? Prnt ?Pall Remote Programming Print and Plot CommandsPrsc PtrcRemote Programming Front Panel Controls and Auto Functions OAUX? Data Transfer CommandsOutp ? Snap ? i,j ,k,l,m,nSpts ? Trca ? i, j, kTrcb ? i, j, k Trcl ? i, j, k Fast ? Strd IDN? Interface CommandsRST Locl ?ESE ? i ,j Status Reporting CommandsCLS SRE ? i ,jSerial Poll Using STB? to read the Serial Poll Status ByteUsing Serial Poll Status ByteService Requests SRQ Standard EventLIA Status Byte INPUT/RESRVExample Program Remote Programming Remote Programming Remote Programming Remote Programming Remote Programming Declare SUB Txlia LIA%, SND$ Declare SUB Finderr Call TXLIALIA%, WRT$ Call IBCLRLIA% BDNAME$ = LIA Call IBFINDBDNAME$, LIA%If LIA% 0 then Call Finderr Call TXLIALIA%, WRT$Next I% WRT$ = FAST2STRD Call TXLIALIA%, WRT$Call IBRDILIA%, RXBUF% DIM RFBUF10Call IBRSPLIA%, SPR% Loop While SPR% and 2 END SUB Performance Tests HardkeysScreen Brightness Performance Tests General InstallationPower Display PositionTest Record Necessary EquipmentPerformance Tests Warm Up If a Test FailsPerformance Tests Setup ProcedureSelf Tests Performance Tests DC Offset GAIN/TCInput Performance Tests Common Mode Rejection GAIN/PHASEINPUT/FILTER Performance Tests Amplitude Accuracy and Flatness GAIN/TC Amplitude Linearity OUTPUT/OFFSETPerformance Tests Frequency Accuracy Performance Tests Phase Accuracy INPUT/FILTERSPerformance Tests Sine Output Amplitude Accuracy and Flatness Performance Tests DC Outputs and Inputs DISPLAY/SCALE Input Noise TRACE/SCANPerformance Tests Self Tests Common Mode RejectionSR850 Performance Test Record DC OffsetSine Output Amplitude and Flatness SR850 Performance Test Record Amplitude LinearityFrequency Accuracy CH1SR850 Performance Test Record DC Outputs and Inputs Input Noise SR850 Service Circuit BoardsSR850 Service Adjusting the DC Offset and Common Mode Rejection REF/PHASERef. Frequency Select Reference Frequency 1 Enter Enter 1 Hz Input Adjusting the Notch Filters Bottom display should read Press SR850 Service Circuit Description Video Driver and CRTCircuit Description Keypad Interface CPU BoardMicroprocessor System Keyboard InterfaceCLOCK/CALENDAR Expansion ConnectorSpeaker Printer InterfacePower Supply Board Unregulated Power SuppliesPower Supply Regulators Circuit Description DSP Logic Board DAC Outputs Interface to CPU BoardGain Stages and Notch Filters Analog Input BoardInput Amplifier ANTI-ALIASING FilterInterface Power Supply Board Parts List 22U MINJP1 DS1RED PIN, WhiteDSP Logic Board Parts List Parts List 1U Axial PIN DIL Digital Parts List Test Jack Card Ejector Analog Input Board Parts ListGAL/PAL, I.C RCA PhonoParts List PIN DI Analog Parts List PIN Mach AD645JN CPU Board Parts List BR-2/3A 2PIN PC1002 00225-548 DIN PIN DRAGpib Shielded Plcc 68 TH Plcc THStatic RAM, I.C NAT9914BPDChassis Assembly Parts List Be CU / FFT SwitchFAN Guard Card GuideSAS50B DpdtENA1J-B20 Softpot SpkrMiscellaneous Parts List Parts List