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NI 5114 Calibration Procedure

9.

Fetch a waveform from the device and perform a voltage RMS measurement using the
niScope Fetch (poly) Measurement VI. Select the Measurement Scalar DBL instance of the
VI. This value is the

Measured RMS Voltage

of 50 kHz Sine Wave

used in step 11.e.

10. Configure the horizontal properties using the niScope Configure Horizontal Timing VI.

LabVIEW VI

C/C++ Function Call

Call

niScope_Fetch

Measurement

with the

following parameters:

timeout

:

1.0

vi

: The instrument handle from

niScope_init

channelList

:

"0"

scalarMeasFunction

:

NISCOPE_VAL_VOLTAGE_R

MS

LabVIEW VI

C/C++ Function Call

Call

niScope_Configure

HorizontalTiming

with the

following parameters:

enforceRealtime

:

NISCOPE_VAL_TRUE

numRecords

:

1

vi

: The instrument handle from

niScope_init

minSampleRate

:

250,000,000

refPosition

:

50.0

minNumPts

:

300,000

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Содержание PXI

Страница 1: ...libration 4 Self Calibration 4 Test Equipment 4 Calibration Procedures 5 Initial Setup 5 Test Conditions 5 Self Calibration 6 MAX 6 NI SCOPE Soft Front Panel 6 NI SCOPE 7 Verification 8 Vertical Offse...

Страница 2: ...in the niScopeCal h file To use these constants in C you must include niScopeCal h in your code when you write the calibration procedure For more information on the calibration VIs and functions refer...

Страница 3: ...ace IVI Drivers niScope Examples Directory of NI SCOPE examples for CVI C Visual C and Visual Basic NI High Speed Digitizers Getting Started Guide Contains NI SCOPE installation hardware installation...

Страница 4: ...times a day may cause excessive wear on the relays over time Test Equipment Table 3 lists the equipment required for externally calibrating the NI 5114 If you do not have the recommended instruments u...

Страница 5: ...Always connect the calibrator test head directly to the input BNC of the device or use a short 50 BNC coaxial cable if necessary Long cables and wires act as antennas picking up extra noise that can a...

Страница 6: ...sed in another program MAX To initiate self calibration from MAX complete the following steps 1 Disconnect or disable any AC inputs to the device 2 Launch MAX 3 Select My System Devices and Interfaces...

Страница 7: ...niScope Cal Self Calibrate VI Note Because the session is a standard session rather than an external calibration session the new calibration constants are immediately stored in the EEPROM Therefore y...

Страница 8: ...y of the NI 5114 To verify vertical offset accuracy complete the procedures described in the Vertical Offset Accuracy section for each of the 20 iterations listed in Table 4 for channel 0 then repeat...

Страница 9: ...4 8 125 10 9 125 20 10 125 40 11 20 0 04 12 20 0 1 13 20 0 2 14 20 0 4 15 20 1 16 20 2 17 20 4 18 20 10 19 20 20 20 20 40 Table 4 NI 5114 Input Parameters for Vertical Offset Accuracy and Vertical Ga...

Страница 10: ...W input values 2 Configure the input impedance and the maximum input frequency using the niScope Configure Chan Characteristics VI LabVIEW VI C C Function Call Call niScope_init with the following par...

Страница 11: ...abVIEW VI C C Function Call Call niScope_Configure Vertical with the following parameters coupling NISCOPE_VAL_DC probeAttenuation 1 0 vi The instrument handle from niScope_init channelList 0 range Th...

Страница 12: ...n of the verification 10 Repeat steps 2 through 9 for each iteration in Table 4 11 Move the calibrator test head to device input channel 1 and repeat steps 2 through 10 for every configuration in Tabl...

Страница 13: ...e Calibration Test Limits V Published Specifications V PXI PXIe PCI PXI PXIe PCI 0 04 0 00024 0 00032 0 00032 0 0004 0 1 0 0002 0 00048 0 0005 0 00058 0 2 0 0004 0 00068 0 0008 0 00088 0 4 0 0008 0 00...

Страница 14: ...figureChan Characteristics with the following parameters channelList 0 inputImpedance NISCOPE_VAL_1_MEG_OHM maxInputFrequency The Maximum Input Frequency value in Table 4 for the current iteration Lab...

Страница 15: ...impedance matching and frequency of the calibrator to settle 8 Initiate a waveform acquisition using the niScope Initiate Acquisition VI LabVIEW VI C C Function Call Call niScope_Configure HorizontalT...

Страница 16: ...that corresponds to the vertical range used 11 Wait 2 500 ms for the impedance matching and frequency of the calibrator to settle 12 Initiate a waveform acquisition using the niScope Initiate Acquisi...

Страница 17: ...ifications column listed in Table 6 If the result is within the selected test limit the device has passed this portion of the verification 15 Repeat steps 2 through 14 for each iteration in Table 5 16...

Страница 18: ...Limits and Published Specifications Range V Positive Input V Negative Input V Calibration Test Limits Published Specifications 0 04 0 018 0 018 1 3975 1 5 0 1 0 045 0 045 1 3975 1 5 0 2 0 09 0 09 1 39...

Страница 19: ...eristics with the following parameters vi The instrument handle from niScope_init channelList 0 inputImpedance NISCOPE_VAL_1_MEG_OHM maxInputFrequency 20 000 000 LabVIEW VI C C Function Call Call niSc...

Страница 20: ...ching and frequency of the calibrator to settle 9 Initiate a waveform acquisition using the niScope Initiate Acquisition VI LabVIEW VI C C Function Call Call niScope_Configure HorizontalTiming with th...

Страница 21: ...C Function Call Call niScope_FetchMeasurem ent with the following parameters timeout 1 0 vi The instrument handle from niScope_init channelList 0 scalarMeasFunction NISCOPE_VAL_VOLTAGE _AVERAGE LabVIE...

Страница 22: ...the Measurement Scalar DBL instance of the VI This value is the Measured Negative Voltage used in step 17 17 Calculate the error in the programmable vertical offset as a percentage of input using the...

Страница 23: ...ue of the channelList parameter from 0 to 1 20 End the session using the niScope Close VI LabVIEW VI C C Function Call Call niScope_close with the following parameter vi The instrument handle from niS...

Страница 24: ...re Vertical VI LabVIEW VI C C Function Call Call niScope_init with the following parameters resourceName The device name assigned by MAX idQuery VI_FALSE resetDevice VI_TRUE LabVIEW VI C C Function Ca...

Страница 25: ...dance matching and frequency of the calibrator to settle 8 Initiate a waveform acquisition using the niScope Initiate Acquisition VI LabVIEW VI C C Function Call Call niScope_Configure HorizontalTimin...

Страница 26: ...million ppm using the following formula error a 11 000 000 11 where a is the measured frequency Compare the result to the Published Specifications column listed in Table 8 If the result is within the...

Страница 27: ...h is optional 1 Open a session and obtain a session handle using the niScope Initialize VI LabVIEW VI C C Function Call Call niScope_close with the following parameter vi The instrument handle from ni...

Страница 28: ...istics with the following parameters vi The instrument handle from niScope_init channelList 0 inputImpedance NISCOPE_VAL_50_OHM maxInputFrequency The Maximum Input Frequency value in Table 9 for the c...

Страница 29: ...input impedance of the device 7 Wait 2 500 ms for the impedance matching and frequency of the calibrator to settle 8 Initiate a waveform acquisition using the niScope Initiate Acquisition VI LabVIEW V...

Страница 30: ...l properties using the niScope Configure Horizontal Timing VI LabVIEW VI C C Function Call Call niScope_Fetch Measurement with the following parameters timeout 1 0 vi The instrument handle from niScop...

Страница 31: ...Calculate the power difference using the following formula power 20log10 a 20log10 b where a is the Measured RMS Voltage of Generated Sine Wave b is the Measured RMS Voltage of 50 kHz Sine Wave If th...

Страница 32: ...e entries for iterations 5 and 6 LabVIEW VI C C Function Call Call niScope_close with the following parameter vi The instrument handle from niScope_init Table 9 NI 5114 Bandwidth and Flatness Stimuli...

Страница 33: ...t with the following parameters resourceName The device name assigned by MAX idQuery VI_FALSE resetDevice VI_TRUE LabVIEW VI C C Function Call Call niScope_ConfigureChan Characteristics with the follo...

Страница 34: ...re HorizontalTiming with the following parameters enforceRealtime NISCOPE_VAL_TRUE numRecords 50 vi The instrument handle from niScope_init minSampleRate 250 000 000 refPosition 50 0 minNumPts 1 000 L...

Страница 35: ...e 9 Initiate a waveform acquisition using the niScope Initiate Acquisition VI 10 Acquire a waveform using the niScope Fetch poly VI Select the Cluster instance of the VI LabVIEW VI C C Function Call C...

Страница 36: ...the following changes Change channelList to 0 in steps 2 3 and 10 Connect the calibrator test head to the external trigger channel TRIG in step 7 14 End the session using the niScope Close VI LabVIEW...

Страница 37: ...erform An adjustment is required only once every two years Following the adjustment procedure automatically updates the calibration date and temperature in the EEPROM of the device Complete all of the...

Страница 38: ...rom 0 to 1 10 Using a BNC cable connect REF FREQUENCY OUTPUT on the back of the calibrator to the channel 0 input of the device Make sure the output of the reference frequency is enabled and set to 10...

Страница 39: ...e niScope Cal End VI LabVIEW VI C C Function Call Call niScope_Cal AdjustVCXO with the following parameters sessionHandle The instrument handle from niScope_CalStart stimulusFreq 10 000 000 LabVIEW VI...

Страница 40: ...ify the performance of the NI 5114 after adjustments Table 11 NI 5114 Input Parameters for External Adjustment Iteration Range V Input V 1 40 18 2 20 9 3 10 4 5 4 4 1 8 5 2 0 9 6 1 0 45 7 0 4 0 18 8 0...

Страница 41: ...ts the device is guaranteed to meet or exceed its published specifications for a full calibration interval two years For this reason you must verify against the calibration test limits when performing...

Страница 42: ...ogrammatically using NI SCOPE functions MAX To retrieve data using MAX complete the following steps 1 Select the device from which you want to retrieve information from My System Devices and Interface...

Страница 43: ...ope_CalFetchDate niScope Cal Fetch Date VI niScope_CalFetchMiscInfo niScope Cal Fetch Misc Info VI niScope_CalFetchTemperature niScope Cal Fetch Temperature VI niScope_CalStoreMiscInfo niScope Cal Sto...

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