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National Instruments NI 54 Series Calibration Procedure

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Computer-Based
Instruments
NI 54XX
Calibration Procedure
NI 54xx Calibration Procedure
May 2001 Edition
Part Number 370332A-01

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  • Page 1 Computer-Based Instruments NI 54XX Calibration Procedure NI 54xx Calibration Procedure May 2001 Edition Part Number 370332A-01...
  • Page 2 Singapore 2265886, Spain 91 640 0085, Sweden 08 587 895 00, Switzerland 056 200 51 51, Taiwan 02 2528 7227, United Kingdom 01635 523545 For further support information, see the Technical Support Resources appendix. To comment on the documentation, send e-mail to techpubs@ni.com Copyright © 2001 National Instruments Corporation. All rights reserved.
  • Page 3 The reader should consult National Instruments if errors are suspected. In no event shall National Instruments be liable for any damages arising out of or related to this document or the information contained in it.
  • Page 4 Conventions The following conventions are used in this manual: Square brackets enclose optional items—for example, [ response » The » symbol leads you through nested menu items and dialog box options to a final action. The sequence File»Page Setup»Options directs you to pull down the File menu, select the Page Setup item, and select Options from the last dialog box.

  • Page 5: Table Of Contents

    Analog Channel ..............3-5 Determining the Value of the On-Board High-Precision Voltage Reference..........3-17 Determining the Frequency Response across the Passband....3-19 Determining the SYNC Duty Cycle Constants.........3-21 Determining the VCXO Calibration Constants ........3-25 © National Instruments Corporation NI 54XX Calibration Procedure...
  • Page 6 Contents Appendix A Overview of the Calibration Constants Appendix B Function Reference Appendix C Function Constants Appendix D Technical Support Resources NI 54XX Calibration Procedure ni.com...

  • Page 7: Introduction-Document Scope

    External adjustment involves measuring device output under different configurations using high-precision external measurement devices. Calibrate externally when you want to do a complete calibration of all constants to a high degree of accuracy. © National Instruments Corporation NI 54XX Calibration Procedure...

  • Page 8: Why Should You Calibrate

    Chapter 1 Introduction—Document Scope Why Should You Calibrate? The characteristics of electronic components drift with time and temperature, which can affect output accuracy as the device ages. Calibration restores your device to NI standards. How Often Should You Calibrate? The output accuracy requirements of your application determine the calibration interval of your NI 54XX device.

  • Page 9: Software

    Be aware that many of the functions listed in Chapter 3, Adjustment, use constants defined in the file. To use these variables, you must niArbCal.h include in your code. See Table 1-3 for file locations. niArbCal.h © National Instruments Corporation NI 54XX Calibration Procedure...
  • Page 10 Chapter 1 Introduction—Document Scope Calibration Software The calibration procedure requires the latest version of the NI-DAQ driver on the calibration system. This driver configures and controls the NI 54XX devices. You can download NI-DAQ from the NI Web site, . NI-DAQ supports programming all NI signal ni.com/softlib.nsf sources using a number of languages, including LabVIEW, Measurement Studio, Microsoft Visual C++, and Microsoft Visual Basic.

  • Page 11: Documentation

    DLL. You niArbCal must link to this library when building applications in Microsoft Visual C++ or National Instruments CVI. This is a header file for the accessible vxipnp\winnt(win95)\include\niArbCal.h functions in the DLL. niArbCal...

  • Page 12: Test Conditions

    Introduction—Document Scope The NI-DAQ Function Reference Online Help includes detailed information on the driver functions. You can access the online help by clicking Start»Programs»National Instruments DAQ»NI-DAQ Help. The NI-DAQ User Manual provides instructions for installing and configuring National Instruments DAQ devices.

  • Page 13: Verification

    Amplitude Flatness Over Frequency ±2 dB Sine Spectral Purity (Harmonic and Spurious) Up to 1 MHz –60 dBc Up to 16 MHz –35 dBc Oscillator Frequency Accuracy ±15 ppm, 20 to 30 °C ambient temperature © National Instruments Corporation NI 54XX Calibration Procedure...
  • Page 14 Chapter 2 Verification The verification procedure for each of these specifications includes setting up, programming, and cleaning up. The setup routine described in the next section, Initializing Device for Verification, is the same for each specification you are verifying. For a diagram of the connectors referenced in the procedure that follows, see Figure 2-1.

  • Page 15: Initializing Device For Verification

    Set the following parameters: • vi—The output value that you obtained from sessionHandle function niFgen_init • Channel_Name— ”0” • Amplitude— • DC_Offset— • Frequency— • Waveform— NIFGEN_VAL_WFM_DC • Start_Phase— © National Instruments Corporation NI 54XX Calibration Procedure...

  • Page 16: Verifying Amplitude Accuracy

    Chapter 2 Verification Call to initiate signal generation. niFgen_InitiateGeneration() This function causes the function generator to leave its configuration state and enter its signal generation state. The only parameter required for this function is sessionHandle Measure the 0.0 V DC generated by your NI 54XX device at ARB OUT using the DMM.

  • Page 17: Verifying Amplitude Flatness Over Frequency

    • Filter_Correction_Frequency— Call to select the channel to niFgen_EnableDigitalFilter() enable a digital filter on. Set the following parameters: • vi—The output value that you obtained from sessionHandle function niFgen_init • Channel_Name— ”0” © National Instruments Corporation NI 54XX Calibration Procedure...
  • Page 18 Chapter 2 Verification Call to select the niFgen_ConfigureStandardWaveform() channel to output a waveform. Set the following parameters: • vi—The output value that you obtained from sessionHandle function niFgen_init • Channel_Name— ”0” • Amplitude— , where = the largest possible peak-to-peak amplitude for the power meter.
  • Page 19 Call to disable the analog niFgen_DisableAnalogFilter() filter. Set the following parameters: • vi—The output value that you obtained sessionHandle from the function niFgen_init • Channel_Name— ”0” End FOR Loop. © National Instruments Corporation NI 54XX Calibration Procedure...

  • Page 20: Verifying Total Harmonic Distortion And Spurious Free Dynamic Range

    Chapter 2 Verification 12. Call to close the instrument I/O session, destroy the niFgen_Close() instrument driver session and all of its properties, and release any memory resources the driver uses. The only parameter required for this function is sessionHandle Verifying Total Harmonic Distortion and Spurious Free Dynamic Range Using a spectrum analyzer, verify the spectral purity of your NI 54XX device by generating a 1 MHz sine wave and a 16 MHz sine wave.
  • Page 21 Set the following parameters: • vi—The output value that you obtained from sessionHandle function niFgen_init • Channel_Name— ”0” • Amplitude— • DC_Offset— • Frequency— 16000000 © National Instruments Corporation NI 54XX Calibration Procedure...

  • Page 22: Verifying Device Oscillator Frequency Accuracy

    Chapter 2 Verification • Waveform— NIFGEN_VAL_WFM_SINE • Start_Phase— Call to initiate signal generation. niFgen_InitiateGeneration() This function causes the function generator to leave its configuration state and enter its signal generation state. The only parameter required for this function is sessionHandle Choose the input attenuator setting of the spectrum analyzer such that the input mixer distortion does not limit the measurements.
  • Page 23 The only parameter required for this function is the sessionHandle You have completed verifying the device oscillator frequency accuracy of your NI 54XX device. © National Instruments Corporation 2-11 NI 54XX Calibration Procedure...

  • Page 24: Adjustment

    Install the NI 54XX device in your host computer. Configure the NI 54XX device with MAX. Looking at Table 3-1 and Figure 3-1 as guides, make the appropriate connections to measure the output from the constants you want to calibrate. © National Instruments Corporation NI 54XX Calibration Procedure...
  • Page 25 Chapter 3 Adjustment Table 3-1. Measuring Calibration Output Measurement Constant to Adjust Type of Measurement Output Connection Device A0–A6 DC voltage ARB OUT/VIDEO OUT A7–A9 Magnitude of a sinusoidal ARB OUT/VIDEO OUT voltage (either amplitude, peak-to-peak amplitude, or RMS value) Internal reference DC voltage ARB OUT/VIDEO OUT...
  • Page 26 EXT TRIG MARKER OUT MARKER OUT SYNC SYNC PLL IN PLL IN PLL REF PLL REF SYNC OUT SYNC OUT VIDEO DIGITAL DIGITAL PATTERN PATTERN PCI/ISA Figure 3-1. NI 5411/5431 I/O Connectors © National Instruments Corporation NI 54XX Calibration Procedure...

  • Page 27: Adjusting Your Ni 54Xx-Procedural Overview

    Chapter 3 Adjustment Adjusting Your NI 54XX—Procedural Overview To adjust your NI 54XX device, complete the following steps. You may also want to see the External Calibration examples in LabVIEW or C, which you can find in Table 1-3. Call to open the session using the following ni54xx_CalStart parameters:...

  • Page 28: Finding The Low Frequency Characteristics Of The Analog Channel

    DAC set to 0. To sweep the full range of the offset calibration DAC, write nine values to the device: (–8192, –6144, –4096, –2048, 0, 2048, 4096, 6144, and 8191). © National Instruments Corporation NI 54XX Calibration Procedure...
  • Page 29 Chapter 3 Adjustment Set the gain calibration DAC to zero by calling the function . Use the following parameters: ni54xx_SetGainDAC • sessionHandle—The handle of the calibration session for the device • DACValue— Generate a 0 V DC waveform by calling the function .
  • Page 30 DAC settings using the following parameters: actualData • sessionHandle—The handle of the calibration session for the device • measurementMode— NI54XX_SET_A2 • actualData— offsetSweepDACValues • measuredData— measurements You have completed measuring the outputs for the constant A2. © National Instruments Corporation NI 54XX Calibration Procedure...
  • Page 31 Chapter 3 Adjustment Determining the Interactions of Gains and Offsets in the Main DAC and Gain Calibration DAC (Constants A3 and A4) To calculate constants, sweep the full range of the 12-bit main DAC (–2048 to 2047) by calling with the amplitude ni54xx_GenerateWaveform parameter set to correspond to the DC value of each DAC setting.
  • Page 32 Generate a DC output of amplitude x by calling the function . Set the following parameters: ni54xx_GenerateWaveform • sessionHandle—The handle of the calibration session for the device • waveType— NI54XX_DC • amplitudeInVolts—x • frequencyInHz— Measure the outputs ( mainDACSweepResults[] © National Instruments Corporation NI 54XX Calibration Procedure...
  • Page 33 Chapter 3 Adjustment Feed the measurements to . The ni54xx_CalAdjust measuredData are the new array of measurements, and the are the DAC actualData values corresponding to outputs (see Table 3-2). Call the function using the following parameters: ni54xx_CalAdjust • sessionHandle—The handle of the calibration session for the device •...
  • Page 34 Set the gain calibration DAC to –4079 (the approximate value for a gain of 1) by calling the function . Set the following ni54xx_SetGainDAC parameters: • sessionHandle—The handle of the calibration session for the device • DACValue— – 4079 © National Instruments Corporation 3-11 NI 54XX Calibration Procedure...
  • Page 35 Chapter 3 Adjustment Generate a full scale sine wave at 500 Hz by calling the function . Set the following parameters: ni54xx_GenerateWaveform • sessionHandle—The handle of the calibration session for the device • waveType— NI54XX_SINE • amplitudeInVolts— • frequencyInHz— Measure the outputs ( lowFrequencyAmplitude Enable the 10 dB attenuator by calling the function .
  • Page 36 Enable the 10 dB attenuator by calling the function . Set the following parameters: ni54xx_SetAttenuation • sessionHandle—The handle of the calibration session for the device • attenuation— Measure the outputs ( offsetWith10dbAttenuatorEnabled © National Instruments Corporation 3-13 NI 54XX Calibration Procedure...
  • Page 37 Chapter 3 Adjustment 10. Call for A0. The should ni54xx_CalAdjust measuredData be an array of values. The first element should be the , and the second element should be offsetInResetState . Call the function offsetWithAnalogFilterEnabled using the following parameters: ni54xx_CalAdjust •...
  • Page 38 • sessionHandle—The handle of the calibration session for the device • waveType— NI54XX_SINE • amplitudeInVolts— • frequencyInHz— Measure the outputs ( lowFrequencyAmplitude Enable each attenuator individually and measure the output amplitude. © National Instruments Corporation 3-15 NI 54XX Calibration Procedure...
  • Page 39 Chapter 3 Adjustment For x = (1, 2, 4, 8, 16, 32) Call the function, , using the following ni54xx_SetAttenuation parameters: • sessionHandle—The handle of the calibration session for the device • attenuation—x Measure the outputs ( attenuatedAmplitudes[] Call for A9_UNTERMINATED. The ni54xx_CalAdjust is an array of values corresponding to the outputs for measuredData...

  • Page 40: Determining The Value Of The On-Board High-Precision Voltage Reference

    ADC value from this result to obtain the internal reference. Offsets for the calibration ADC are accounted for internally, so you only need to measure the ADC value and the device output value. © National Instruments Corporation 3-17 NI 54XX Calibration Procedure...
  • Page 41 Chapter 3 Adjustment Set the offset calibration DAC to 0 by calling the function . Set the following parameters: ni54xx_SetOffsetDAC • sessionHandle—The handle of the calibration session for the device • DACValue— Set the gain calibration DAC to –4079 (the approximate value for a gain of 1) by calling the function .

  • Page 42: Determining The Frequency Response Across The Passband

    NI54XX_UNTERMINATED Generate a low frequency full scale (10 V) sine wave by calling the function . Set the following parameters: ni54xx_GenerateWaveform • sessionHandle—The handle of the calibration session for the device © National Instruments Corporation 3-19 NI 54XX Calibration Procedure...
  • Page 43 Chapter 3 Adjustment • waveType— NI54XX_SINE • amplitudeInVolts— • frequencyInHz— Measure the outputs, and store as the first element in the frequency responses array ( frequencyResponses[0] For x = (1000000, 2000000, …15000000, 16000000) Generate a full scale sine wave at frequency x by calling the function .

  • Page 44: Determining The Sync Duty Cycle Constants

    “best-guess” value and repeat the process. Calculate D0 first by converging on a duty cycle of 50%, then calculate D1 by converging on duty cycles of 25% and 75%. © National Instruments Corporation 3-21 NI 54XX Calibration Procedure...
  • Page 45 Chapter 3 Adjustment D0 Constant Enable the analog filter by calling the function . Set the following parameters: ni54xx_SetAnalogFilter • sessionHandle—The handle of the calibration session for the device • filterState— NI54XX_ENABLE Generate a full scale (10 V) sine wave at 1000 Hz by calling the function .
  • Page 46 (in this case, 25). Call using the following parameters: ni54xx_CalAdjust • sessionHandle—The handle of the calibration session for the device • measurementMode— NI54XX_SET_D1_25 • actualData— &desiredDutyCycle • measuredData— &currentDutyCycle © National Instruments Corporation 3-23 NI 54XX Calibration Procedure...
  • Page 47 Chapter 3 Adjustment Try the new “best-guess” by calling the function . Set the following parameters: ni54xx_SetDutyCycle • sessionHandle—The handle of the calibration session for the device • dutyCycle— Measure the new duty cycle ( currentDutyCycle Set a 75% duty cycle by calling the function ni54xx_SetDutyCycle Set the following parameters: •...

  • Page 48: Determining The Vcxo Calibration Constants

    Generate a full scale (10 V) sine wave at 1 MHz by calling the function . Set the following parameters: ni54xx_GenerateWaveform • sessionHandle—The handle of the calibration session for the device • waveType— NI54XX_SINE • amplitudeInVolts— • frequencyInHz— 1000000 © National Instruments Corporation 3-25 NI 54XX Calibration Procedure...
  • Page 49 Chapter 3 Adjustment Set the gain and offset using ni54xx_SetAdjustedGainAndOffset with 0 offset and 0 attenuation, in the unterminated case. Use the following parameters: • sessionHandle—The handle of the calibration session for the device • offsetInVolts— • attenuationInDb— • terminationState— NI54XX_UNTERMINATED Initialize the VCXO calibration for normal mode by calling the function .
  • Page 50 Set the gain and offset by calling the function with 0 offset and ni54xx_SetAdjustedGainAndOffset 0 attenuation, in the unterminated case. Set the following parameters: • sessionHandle—The handle of the calibration session for the device • offsetInVolts— © National Instruments Corporation 3-27 NI 54XX Calibration Procedure...
  • Page 51 Chapter 3 Adjustment • attenuationInDb— • terminationState— NI54XX_UNTERMINATED Initialize the VCXO calibration for M-PAL mode by calling the function . Set the following ni54xx_InitializeVCXOCalibration parameters: • sessionHandle—The handle of the calibration session for the device • type— NI54XX_SET_VCXO_PAL_M Set the VCXO with the current “best-guess” value (M-PAL mode) by calling the function .
  • Page 52 Initialize the VCXO calibration for NTSC mode by calling the function . Set the ni54xx_InitializeVCXOCalibration following parameters: • sessionHandle—The handle of the calibration session for the device • type— NI54XX_SET_VCXO NTSC_M © National Instruments Corporation 3-29 NI 54XX Calibration Procedure...
  • Page 53 Chapter 3 Adjustment Set the VCXO with the current “best-guess” value (NTSC mode) by calling the function . Set the following ni54xx_CalibrateVCXO parameters: • sessionHandle—The handle of the calibration session for the device • type— NI54XX_SET_VCXO_NTSC_M Measure the new frequency ( currentFrequency While the |frequency –...
  • Page 54 Output dependence on the gains of the gain calibration DAC and the main DAC. Output dependence on the offset of the offset calibration DAC. Output dependence on the cumulative offsets of the amplifiers in the analog channel. © National Instruments Corporation NI 54XX Calibration Procedure...
  • Page 55 Appendix A Overview of the Calibration Constants Table A-1. DC or Low-Frequency Gains and Offsets of Components within the Analog Channel (Continued) Constant Name Description The low frequency gain of the analog filter. The gain of the 10 dB attenuator in the analog channel. An array of constants corresponding to the gains of the six post-amplification Unterminated attenuators (1, 2, 4, 8, 16, 32 dB) when device is unterminated.
  • Page 56 40 MHz as possible. For the NI 5431, two additional constants are stored. These constants represent the proper VCXO settings for generating phase alternation line (M-PAL) and National Television System Committee (NTSC) video signals, which require slightly different update rates. © National Instruments Corporation NI 54XX Calibration Procedure...
  • Page 57 NI 54XX devices. This interface provides access to the and can be used to write calibration procedures for any niarbcal.dll NI 54XX device. Note All functions return signed, 32-bit integers corresponding to the status of the operation. © National Instruments Corporation NI 54XX Calibration Procedure...
  • Page 58 Appendix B Function Reference ni54xx_CalStart Format __declspec(dllexport) long __stdcall ni54xx_CalStart( shortdevice, char *password, unsigned long *sessionHandle); Purpose Initiates a calibration session for the specified device. Parameters Name Description A number corresponding to the DAQ device number of the device device to be calibrated. The external adjustment password.
  • Page 59 An array of doubles, a pointer to one double, or actualData NULL depending on the parameter. measurementMode An array of doubles, a pointer to one double, or measuredData NULL depending on the parameter. measurementMode © National Instruments Corporation NI 54XX Calibration Procedure...
  • Page 60 Appendix B Function Reference ni54xx_CalEnd Format __declspec(dllexport) long __stdcall ni54xx_CalEnd(unsigned long *sessionHandle, unsigned long action); Purpose Closes the calibration session and either commits or discards the new constants that have been calculated. Parameters Name Description A pointer to the handle of the calibration session for the sessionHandle device, created with a call to ni54xx_CalStart...
  • Page 61 A0 through A8. do not need to be called with CalStart CalEnd this function. Parameter Name Description A number corresponding to the DAQ device number of the device device to be calibrated. © National Instruments Corporation NI 54XX Calibration Procedure...
  • Page 62 Appendix B Function Reference ni54xx_CalFetchDate Format __declspec(dllexport) long __stdcall ni54xx_CalFetchDate(unsigned long device, long area, long *month, long *day, long *year); Purpose Retrieves the date of the last calibration, either from the internal (self-calibration) or external (manual calibration) area. Parameters Name Description A number corresponding to the DAQ device number of the device...
  • Page 63 A number corresponding to the DAQ device number of the device device to be calibrated. The area (internal or external) from where to get the date area NI54XX_INTERNAL NI54XX_EXTERNAL A pointer to a long integer which receives the count value. count © National Instruments Corporation NI 54XX Calibration Procedure...
  • Page 64 Appendix B Function Reference ni54xx_CalFetchMiscInfo Format __declspec(dllexport) long __stdcall ni54xx_CalFetchMiscInfo(unsigned long device, char *miscInfo); Purpose Retrieves four bytes of data from the external adjustment miscellaneous data area. Parameters Name Description A number corresponding to the DAQ device number of the device device to be calibrated.
  • Page 65 A number corresponding to the DAQ device number of the device device to be calibrated. This should be a char pointer which points to a buffer which miscInfo is at least 4 bytes long. This buffer should be allocated by you. © National Instruments Corporation NI 54XX Calibration Procedure...
  • Page 66 Appendix B Function Reference ni54xx_CalChangePassword Format __declspec(dllexport) long __stdcall ni54xx_CalChangePassword(unsigned long device, char *oldPassword, char *newPassword); Purpose Changes the password, which is needed to do a full external adjustment. Parameters Name Description A number corresponding to the DAQ device number of the device device to be calibrated.
  • Page 67 Use if an internal adjustment goes awry or produces unacceptable results. Parameter Name Description A number corresponding to the DAQ device number of the device device to be calibrated. © National Instruments Corporation B-11 NI 54XX Calibration Procedure...
  • Page 68 Appendix B Function Reference ni54xx_DeviceReset Format __declspec(dllexport) long __stdcall ni54xx_DeviceReset(unsigned long sessionHandle ); Purpose Resets the NI 54XX device and puts it in a default reset state. Parameter Name Description The handle of the calibration session for the device, created sessionHandle with a call to ni54xx_CalStart...
  • Page 69 Enables or disables the output of the device. Parameters Name Description The handle of the calibration session for the device, created sessionHandle with a call to ni54xx_CalStart Indicates whether to enable or disable the output outputState NI54XX_ENABLE NI54XX_DISABLE © National Instruments Corporation B-13 NI 54XX Calibration Procedure...
  • Page 70 Appendix B Function Reference ni54xx_SetAnalogFilter Format __declspec(dllexport) long __stdcall ni54xx_SetAnalogFilter(unsigned long sessionHandle, unsigned long filterState ); Purpose Enables or disables the analog filter of the device. Parameters Name Description The handle of the calibration session for the device, created sessionHandle with a call to ni54xx_CalStart Indicates whether to enable or disable the filter...
  • Page 71 The handle of the calibration session for the device, created sessionHandle with a call to ni54xx_CalStart Indicates whether to enable or disable the filter filterState . This normally NI54XX_ENABLE NI54XX_DISABLE should be enabled. © National Instruments Corporation B-15 NI 54XX Calibration Procedure...
  • Page 72 Appendix B Function Reference ni54xx_SetOutputImpedance Format __declspec(dllexport) long __stdcall ni54xx_SetOutputImpedance(unsigned long sessionHandle, unsigned long impedance ); Purpose Sets the output impedance of the device (50 or 75 ohms). During calibration, the impedance should never be set to 75 ohms because the terminated case assumes a 50 ohm load. This requirement is true also for the NI 5431 devices.
  • Page 73 The amplitude of the waveform (in volts), this is the amplitudeInVolts amplitude into an unterminated (high impedance) load. The frequency of the waveform (in hertz) ignored for the frequencyInHz DC case, of course. © National Instruments Corporation B-17 NI 54XX Calibration Procedure...
  • Page 74 Appendix B Function Reference ni54xx_GenerateVideoWaveform Format __declspec(dllexport) long __stdcall ni54xx_GenerateVideoWaveform(unsigned long sessionHandle, unsigned long waveType, double amplitudeInVolts, double frequencyInHz, unsigned long videoMode); Purpose Causes the device to output a DC voltage or a sine wave with a specified amplitude and frequency.
  • Page 75 The handle of the calibration session for the device, created sessionHandle with a call to ni54xx_CalStart The duty cycle of the SYNC output, in percentage dutyCycle (for example, for 50% duty cycle, dutyCycle = 50.0). © National Instruments Corporation B-19 NI 54XX Calibration Procedure...
  • Page 76 Appendix B Function Reference ni54xx_SetAdjustedGainAndOffset Format __declspec(dllexport) long __stdcall ni54xx_SetAdjustedGainAndOffset(unsigned long sessionHandle, double offsetInVolts, unsigned long attenuationInDb, unsigned long terminatedState ); Purpose Configures the device to output with a certain level of attenuation and a certain offset. It uses the calibration constants for the session (including those that have been changed during the session) to calculate the appropriate settings for the calibration DACs.
  • Page 77 The handle of the calibration session for the device, created sessionHandle with a call to ni54xx_CalStart The integer value to write to the gain DAC ranges from –8192 DACValue to 8191. © National Instruments Corporation B-21 NI 54XX Calibration Procedure...
  • Page 78 Appendix B Function Reference ni54xx_SetOffsetDAC Format __declspec(dllexport) long __stdcall ni54xx_SetOffsetDAC(unsigned long sessionHandle, long DACValue ); Purpose Sets the offset calibration DAC to the specified value, which affects the pre-attenuation offset of the signal. Parameters Name Description The handle of the calibration session for the device, created sessionHandle with a call to ni54xx_CalStart...
  • Page 79 The handle of the calibration session for the device, created sessionHandle with a call to ni54xx_CalStart Amount of attenuation to apply to the signal in dB: (0, 1, 2, 4, attenuation 8, 10, 16, 32). © National Instruments Corporation B-23 NI 54XX Calibration Procedure...
  • Page 80 Appendix B Function Reference ni54xx_SetCalibrationMux Format __declspec(dllexport) long __stdcall ni54xx_SetCalibrationMux(unsigned long sessionHandle, unsigned long muxSetting ); Purpose Determines what value is read by a call to , the ground vs. the ground, ReadCalibrationADC the reference vs. the reference, the output vs. the ground, or the output vs. the reference. You should only set to output vs.
  • Page 81 ADC. Parameters Name Description The handle of the calibration session for the device, created sessionHandle with a call to ni54xx_CalStart A pointer to the value returned by the function. calADCValue © National Instruments Corporation B-25 NI 54XX Calibration Procedure...
  • Page 82 Appendix B Function Reference ni54xx_InitializeVCXOCalibration Format __declspec(dllexport) long __stdcall ni54xx_InitializeVCXOCalibration(unsigned long sessionHandle, unsigned long type); Purpose The VCXO is calibrated iteratively. Call this function before calibrating the VCXO because it sets many internal variables to appropriate values for the calibration. Parameters Name Description...
  • Page 83 The handle of the calibration session for the device, sessionHandle created with a call to ni54xx_CalStart The type of VCXO calibration to be done type NI54XX_SET_VCXO (for the NI 5431 ONLY) or NI54XX_SET_PAL_M (for the NI 5431 ONLY) NI54XX_SET_NTSC_M © National Instruments Corporation B-27 NI 54XX Calibration Procedure...
  • Page 84 This appendix lists the constants which are passed and returned by calibration functions. Status Constants NI54XX_STATUS_SUCCESS NI54XX_STATUS_FUNCTION_NOT_SUPPORTED NI54XX_STATUS_DEVICE_NOT_FOUND NI54XX_STATUS_DEVICE_NOT_SUPPORTED NI54XX_STATUS_BAD_HANDLE NI54XX_STATUS_INCORRECT_PASSWORD NI54XX_STATUS_INVALID_ACTION NI54XX_STATUS_INVALID_WAVE_TYPE NI54XX_STATUS_INVALID_AMPLITUDE NI54XX_STATUS_INVALID_FREQUENCY NI54XX_STATUS_INVALID_VIDEO_MODE NI54XX_STATUS_INVALID_DUTY_CYCLE NI54XX_STATUS_INVALID_OFFSET NI54XX_STATUS_INVALID_ATTENUATION NI54XX_STATUS_INVALID_TERMINATION_STATE NI54XX_STATUS_INVALID_DAC_VALUE NI54XX_STATUS_INVALID_FILTER_STATE NI54XX_STATUS_INVALID_OUTPUT_IMPEDANCE NI54XX_STATUS_INVALID_MUX_SETTING NI54XX_STATUS_INVALID_CALIBRATION_AREA NI54XX_STATUS_INVALID_OUTPUT_STATE © National Instruments Corporation NI 54XX Calibration Procedure...
  • Page 85 Appendix C Function Constants NI54XX_STATUS_BAD_PARAMETER_1 NI54XX_STATUS_BAD_PARAMETER_2 NI54XX_STATUS_BAD_PARAMETER_3 NI54XX_STATUS_BAD_PARAMETER_4 NI54XX_STATUS_BAD_PARAMETER_5 NI54XX_STATUS_BAD_PARAMETER_6 NI54XX_STATUS_UNKNOWN_ERROR Constants that are Option Parameters for the ni54xx_CalEnd Function NI54XX_ABORT NI54XX_COMMIT_CONSTANTS Constants Used as Parameters in Functions that Control the Device NI54XX_50_OHMS NI54XX_75_OHMS NI54XX_DISABLE NI54XX_ENABLE NI54XX_UNTERMINATED NI54XX_TERMINATED NI54XX_DC NI54XX_SINE NI54XX_PAL_M NI54XX_NTSC_M NI54XX_GND_VS_GND...
  • Page 86 These constants specify which calibration constant is currently being adjusted: NI54XX_SET_A1 NI54XX_SET_A2 NI54XX_SET_A3 NI54XX_SET_A4 NI54XX_SET_A7 NI54XX_SET_A8 NI54XX_SET_A0 NI54XX_SET_A5 NI54XX_SET_A6 NI54XX_SET_A9_UNTERMINATED NI54XX_SET_INTERNAL_REFERENCE NI54XX_SET_A9_TERMINATED NI54XX_SET_A9TA NI54XX_SET_FREQUENCY_RESPONSE_UNTERMINATED NI54XX_SET_FREQUENCY_RESPONSE_TERMINATED NI54XX_SET_D0 NI54XX_SET_D1_25 NI54XX_SET_D1_75 NI54XX_SET_D1 NI54XX_SET_VCXO NI54XX_SET_VCXO_PAL_M NI54XX_SET_VCXO_NTSC_M © National Instruments Corporation NI 54XX Calibration Procedure...
  • Page 87 Technical Support Resources Web Support National Instruments Web support is your first stop for help in solving installation, configuration, and application problems and questions. Online problem-solving and diagnostic resources include frequently asked questions, knowledge bases, product-specific troubleshooting wizards, manuals, drivers, software updates, and more. Web support is available through the Technical Support section of .
  • Page 88 Appendix D Technical Support Resources Worldwide Support National Instruments has offices located around the world to help address your support needs. You can access our branch office Web sites from the Worldwide Offices section of . Branch office Web sites provide ni.com...

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