National Instruments NI PXIe-5624 Скачать руководство пользователя

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NI PXIe-5624R Calibration Procedure

Call

niIFDig ExternalCal v1 Host.lvclass:Amplitude Cal

Initialize.vi

. Wire

External 10 MHz Reference Clock

to the

reference clock

source

input.

Call

niIFDig ExternalCal v1 Host.lvclass:Amplitude Cal

Configure.vi

Configure the signal generator using the following settings:

•

Frequency: value of the

frequency to generate (Hz)

output from

niIFDig

External Cal v1 Host.lvclass:Amplitude Cal Configure.vi

•

Power level: value of the

power to generate (dBm)

output from

niIFDig

External Cal v1 Host.lvclass:Amplitude Cal Configure.vi

plus

12 dB

•

Reference Clock source: Internal

10. Configure the power sensor to correct for the

frequency to generate (Hz)

output from

niIFDig External Cal v1 Host.lvclass:Amplitude Cal Configure.vi

using the power sensor frequency correction function.

11. Measure the power of the signal present at splitter output 1 of the power splitter using the

power sensor. Record this value as the

measured input power

12. Calculate the

corrected input power

using the following equation:

corrected input power

measured input power + splitter balance

Tip

Find the

splitter balance

by choosing the correct data point from the

Characterizing Power Splitter Balance

section. Remember that certain frequencies

are not measured due to harmonics aliasing back on the fundamental.

13. Call

niIFDig ExternalCal v1 Host.lvclass Amplitude Cal Adjust.vi

Wire the

corrected input power

calculated in step 12 to the

actual power (dBm)

input.

Wire the

frequency

output from

niIFDig External Cal v1 Host.lvclass:

Amplitude Cal Configure.vi

to the

actual frequency (Hz)

input.

14. Repeat steps 8 through 13 until the

amplitude calibration complete

output of

niIFDig

ExternalCal v1 Host.lvclass:Amplitude Cal Adjust.vi

returns a value of

TRUE.

15. Call

niIFDig ExternalCal v1 Host.lvclass:Close External

Calibration.vi

. Set the

write calibration to hardware?

input to TRUE to store the

results to the NI 5624R flash memory.

Содержание NI PXIe-5624

Страница 1: ...PXIe 5624...

Страница 2: ...PGA converts data from the ADC into quadrature I Q data This DSP shifts the frequency of decimates equalizes and calibrates the data before storing it into DRAM Use Interactive Spectrum Acquisition Ho...

Страница 3: ...oftware from ni com downloads Documentation You might find the following documentation helpful as you perform the calibration procedure NI PXIe 5624R Getting Started Guide NI IF Digitizers Help NI PXI...

Страница 4: ...for this procedure Verifying absolute amplitude accuracy Adjusting internal frequency reference B22 option needed for this procedure Adjusting absolute amplitude accuracy Frequency range 4 MHz to 2 00...

Страница 5: ...adapter Huber Suhner 31_3 SMA 50 1 1 _UE or Fairview Microwave SM4236 Test system characterization Frequency range DC to 2 GHz Impedance 50 Return loss 23 dB 3 5 mm m to 3 5 mm m adapter Huber Suhner...

Страница 6: ...each verification procedure insert a delay between configuring all devices and acquiring the measurement Adjust this delay depending on the instruments used but make sure it is at least 5 000 ms for t...

Страница 7: ...e verification and adjustment procedures use test points from 5 MHz to 2 005 GHz in 5 MHz steps for the splitter balance characterization Frequencies in which harmonics alias on the fundamental freque...

Страница 8: ...rrection function 7 Use the power sensor to measure the power at the frequency from step 6 8 Repeat steps 5 through 7 by updating the signal generator frequency from 5 MHz to 2 005 GHz in 5 MHz steps...

Страница 9: ...e signal generator frequency from 5 MHz to 2 005 GHz in 5 MHz steps Record the resulting measurements as splitter output 1 power Each frequency should have a corresponding value 16 Calculate the split...

Страница 10: ...ate self calibration using one of the following methods Click Self Calibrate in the upper right corner of MAX Right click the name of the device in the MAX configuration tree and select Self Calibrate...

Страница 11: ...ference using a signal generator Use digitizer mode of the NI 5624R Use Interactive IF Acquisition Without DSP Host vi in the Multirecord Acquisition sample project as a starting point 1 Connect the s...

Страница 12: ...gle Tone Information vi 5 Calculate the deviation using the following equation 6 Compare the value determined in step 5 to the verification test limits in the following table where initial accuracy 20...

Страница 13: ...e across 400 MHz of bandwidth for each center frequency is measured This procedure requires the test setup and data collected in the Characterizing Power Splitter Balance section Characterize the powe...

Страница 14: ...front panel connector The following figure illustrates the complete hardware setup Figure 4 Absolute Amplitude Accuracy Verification Cabling Diagram 1 Power Sensor 2 SMA m to N f Adapter 3 Power Spli...

Страница 15: ...sult as measured input power Note Power sensor readings are in dBm not watts 9 Calculate the corrected input power using the following equation corrected input power measured input power splitter bala...

Страница 16: ...R flash memory Successfully complete all required verifications or successfully complete reverification following adjustment prior to updating the calibration date and time on the NI 5624R Complete th...

Страница 17: ...panel connector to the NI 5624R IF IN front panel connector using an SMA m to SMA m cable The following figure illustrates the hardware setup Figure 5 Internal Frequency Reference Adjustment Cabling...

Страница 18: ...he power splitter balance characterization data for the correct frequency as the following frequencies are excluded from the adjustment procedure due to harmonics aliasing back on to the fundamental a...

Страница 19: ...that the NI 5624R and the signal generator share a common reference The following steps assume you have connected the signal generator reference frequency REF OUT to the NI 5624R REF IN connector 6 C...

Страница 20: ...plitter output 1 of the power splitter using the power sensor Record this value as the measured input power 12 Calculate the corrected input power using the following equation corrected input power me...

Страница 21: ...NI Refer to the Worldwide Support and Services section for information about support resources or service requests Worldwide Support and Services The National Instruments website is your complete reso...

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