National Instruments NI PXI-5422 Uživatelský manuál Strana 1

CALIBRATION PROCEDURENI PXI-5422This document contains step-by-step instructions for writing a calibration procedure for the NI PXI-5422 arbitrary wav

NI PXI-5422 Calibration Procedure 10 ni.comOptional CalibrationYou can choose to skip the adjustment steps of the calibration procedure if the output

© National Instruments Corporation 11 NI PXI-5422 Calibration ProcedureFigure 2. Optional Calibration Programming FlowSelf-CalibrateVerifyDocument Pr

NI PXI-5422 Calibration Procedure 12 ni.comExternal Calibration RequirementsThis section describes the test equipment and test conditions required for

© National Instruments Corporation 13 NI PXI-5422 Calibration ProcedureExternal Calibration Procedures The complete external calibration procedure con

NI PXI-5422 Calibration Procedure 14 ni.comVerifying NI PXI-5422 SpecificationsNote Always self-calibrate the NI PXI-5422 before beginning a verifica

© National Instruments Corporation 15 NI PXI-5422 Calibration ProcedureFigure 3. NI PXI-5422 Front Panel ConnectorsPFI 0PFI 1NI PXI-542216-Bit 200 MS

NI PXI-5422 Calibration Procedure 16 ni.comVerifying the Oscillator Frequency AccuracyThis test verifies the frequency accuracy of the oscillator on t

© National Instruments Corporation 17 NI PXI-5422 Calibration Procedure5. Call niFgen_SetAttributeViReal64 to set the offset (niFgen property node: Ar

NI PXI-5422 Calibration Procedure 18 ni.comA frequency error of 45 Hz for a 10 MHz signal corresponds to an error of 4.5 ppm. This limit accounts for

© National Instruments Corporation 19 NI PXI-5422 Calibration Procedure• IDQuery: VI_TRUE• resetDevice: VI_TRUE• vi: A pointer to a ViSession. The var

NI PXI-5422 Calibration Procedure 2 ni.comAdjusting the Analog Output ...35Adjusting the Oscillator F

NI PXI-5422 Calibration Procedure 20 ni.com7. Call niFgen_SetAttributeViBoolean to enable the analog output (niFgen property node: Basic Operation»Out

© National Instruments Corporation 21 NI PXI-5422 Calibration Procedure12. Call niFgen_SetAttributeViReal64 to set the offset (niFgen property node: A

NI PXI-5422 Calibration Procedure 22 ni.comTable 4. Values for Verifying the Gain of the Main Analog Path Iteration GainIdeal Positive Full-Scale(Vol

© National Instruments Corporation 23 NI PXI-5422 Calibration Procedure21 0.018500 0.018500 – 0.018500 ±0.000530 ±0.00057422 0.013000 0.013000 – 0.0

NI PXI-5422 Calibration Procedure 24 ni.com14. Call niFgen_SetAttributeViReal64 to set the gain (niFgen property node: Arbitrary Waveform Output»Arbit

© National Instruments Corporation 25 NI PXI-5422 Calibration Procedure23. Subtract the Ideal Negative Full-Scale value from the Measured Negative Ful

NI PXI-5422 Calibration Procedure 26 ni.comTable 5. Values for Verifying the Offset of the Main Analog Path Iteration GainIdeal Positive Offset (Volt

© National Instruments Corporation 27 NI PXI-5422 Calibration Procedure21 0.018500 0.009250 – 0.009250 ±0.000532 ±0.00057922 0.013000 0.006500 – 0.0

NI PXI-5422 Calibration Procedure 28 ni.com5. Call niFgen_SetAttributeViReal64 to set the offset (niFgen property node: Arbitrary Waveform Output»Arbi

© National Instruments Corporation 29 NI PXI-5422 Calibration Procedure13. Measure the negative DC voltage out of the NI PXI-5422. Record negative DC

© National Instruments Corporation 3 NI PXI-5422 Calibration ProcedureWhat Is Calibration?Calibration consists of verifying the output accuracy of a d

NI PXI-5422 Calibration Procedure 30 ni.comTable 6. Values for Verifying the Gain of the Direct Analog Path Iteration GainIdeal Positive Full-Scale(V

© National Instruments Corporation 31 NI PXI-5422 Calibration Procedure4. Call niFgen_SetAttributeViReal64 to set the gain (niFgen property node: Arbi

NI PXI-5422 Calibration Procedure 32 ni.com11. Measure the negative DC voltage out of the NI PXI-5422. Record the negative DC voltage out measurement

© National Instruments Corporation 33 NI PXI-5422 Calibration Procedure1. Call niFgen_InitExtCal (niFgen Init Ext Cal VI) to open an NI-FGEN external

NI PXI-5422 Calibration Procedure 34 ni.comFigure 4. NI PXI-5422 External Calibration ProcedureInitialize Ext Cal SessionInitialize Analog Output Cal

© National Instruments Corporation 35 NI PXI-5422 Calibration ProcedureInitializing the External Calibration SessionCall niFgen_InitExtCal (niFgen Ini

NI PXI-5422 Calibration Procedure 36 ni.com3. Call niFgen_SetAttributeViInt32 to set the analog path value (niFgen property node: Output Attributes»An

© National Instruments Corporation 37 NI PXI-5422 Calibration Procedure8. Call niFgen_SetAttributeViReal64 to set the post-amplifier attenuation (niFg

NI PXI-5422 Calibration Procedure 38 ni.com2. Call niFgen_SetAttributeViReal64 to set the post-amplifier attenuation (niFgen property node: Calibratio

© National Instruments Corporation 39 NI PXI-5422 Calibration Procedure5. Call niFgen_SetAttributeViBoolean to set the analog filter state (niFgen pro

NI PXI-5422 Calibration Procedure 4 ni.comThe output accuracy requirements of your application determine how often you should externally calibrate the

NI PXI-5422 Calibration Procedure 40 ni.comf. Call niFgen_SetAttributeViInt32 to set the gain DAC value (niFgen property node: Calibration»Gain DAC Va

© National Instruments Corporation 41 NI PXI-5422 Calibration Procedure8. Call niFgen_CalAdjustMainPathPreAmpOffset (niFgen Cal Adjust Main Path Pre A

NI PXI-5422 Calibration Procedure 42 ni.com3. Call niFgen_SetAttributeViInt32 to set the offset DAC value (niFgen property node: Calibration»Offset DA

© National Instruments Corporation 43 NI PXI-5422 Calibration Procedure6. Call niFgen_SetAttributeViReal64 to set the pre-amplifier attenuation (niFge

NI PXI-5422 Calibration Procedure 44 ni.comg. Call niFgen_WriteBinary16AnalogStaticValue (niFgen Write Binary 16 Analog Static Value VI) to set the ma

© National Instruments Corporation 45 NI PXI-5422 Calibration ProcedureAdjusting the Main Path Post-Amplifier Gain and Offset1. Call niFgen_WriteBinar

NI PXI-5422 Calibration Procedure 46 ni.com6. Call niFgen_SetAttributeViInt32 to set the analog path value (niFgen property node: Output Attributes»An

© National Instruments Corporation 47 NI PXI-5422 Calibration Procedure8. Take the following voltage measurements at the NI PXI-5422 CH 0 front panel

NI PXI-5422 Calibration Procedure 48 ni.com9. Call niFgen_CalAdjustMainPathPostAmpGainAndOffset (niFgen Cal Adjust Main Path Post Amp Gain And Offset

© National Instruments Corporation 49 NI PXI-5422 Calibration Procedure4. Call niFgen_SetAttributeViBoolean to set the analog filter state (niFgen pro

© National Instruments Corporation 5 NI PXI-5422 Calibration Procedurecalling a 32-bit DLL. Many of the functions use constants defined in the niFgen.

NI PXI-5422 Calibration Procedure 50 ni.com9. Call niFgen_SetAttributeViInt32 to set the analog path value (niFgen property node: Output Attributes»An

© National Instruments Corporation 51 NI PXI-5422 Calibration Procedureg. Call niFgen_Commit (niFgen Commit VI) to commit the attribute values to the

NI PXI-5422 Calibration Procedure 52 ni.com12. Call niFgen_CalAdjustDirectPathGain (niFgen Cal Adjust Direct Path Gain VI) using the following paramet

© National Instruments Corporation 53 NI PXI-5422 Calibration Procedure4. Call niFgen_SetAttributeViReal64 to set the offset (niFgen property node: Ar

NI PXI-5422 Calibration Procedure 54 ni.com9. Call niFgen_CreateArbWaveform (niFgen Create Arbitrary Waveform VI) using the following parameters:• vi:

© National Instruments Corporation 55 NI PXI-5422 Calibration Procedurec. Call niFgen_InitiateGeneration (niFgen Initiate Generation VI) to initiate t

NI PXI-5422 Calibration Procedure 56 ni.com5. Call niFgen_SetAttributeViInt32 to set the offset DAC value (niFgen property node: Calibration»Offset DA

© National Instruments Corporation 57 NI PXI-5422 Calibration Procedure• vi: The session handle returned from niFgen_InitExtCal• channelName: "0&

NI PXI-5422 Calibration Procedure 58 ni.com• returnCalibratedValue: VI_FALSE• calADCValue: A ViReal64 variable. The variable passed by reference throu

© National Instruments Corporation 59 NI PXI-5422 Calibration Procedure27. Call niFgen_ReadCalADC (niFgen Read CAL ADC VI) to measure the analog outpu

NI PXI-5422 Calibration Procedure 6 ni.comDocumentationFor information about NI-FGEN and the NI PXI-5422, you may find the following documents helpful

NI PXI-5422 Calibration Procedure 60 ni.com33. Call niFgen_SetAttributeViBoolean to disable the analog output (niFgen property node: Basic Operation»O

© National Instruments Corporation 61 NI PXI-5422 Calibration ProcedureCalibration UtilitiesNI-FGEN supports several calibration utilities that allow

NI PXI-5422 Calibration Procedure 62 ni.comNI-FGENNI-FGEN provides a full complement of calibration utility functions and VIs. Refer to the NI Signal

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© National Instruments Corporation 7 NI PXI-5422 Calibration Procedure3. Select the device that you want to calibrate.4. Initiate self-calibration in

NI PXI-5422 Calibration Procedure 8 ni.comExternal Calibration OptionsExternal calibration involves both verification and adjustment. Verification is

© National Instruments Corporation 9 NI PXI-5422 Calibration ProcedureFigure 1. Complete Calibration Programming FlowAdjust(Cal Dates and Temperature