National Instruments NI PXIe-5624, Процедура калибровки

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CALIBRATION PROCEDURE
NI PXIe-5624R
2 GS/s, 12-Bit IF Digitizer
This document contains the verification and adjustment procedures for the NI PXIe-5624R
(NI 5624R) IF digitizer. Refer to
ni.com/calibration
for more information about
calibration solutions.
NI LabVIEW Instrument Design Libraries for IF Digitizers includes example FPGA images to
use the NI 5624R in two modes of operation:
•
Digitizer Mode
—IF data is captured directly from the ADC without DSP and stored into
DRAM. This data is not equalized or calibrated. Use
Interactive IF Acquisition
Without DSP (Host).vi
from the Multirecord Acquisition sample project to acquire
data in digitizer mode.
• Digital Downconversion (DDC) Mode —Signal processing on the FPGA 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 (Host).vi
from the Multirecord Acquisition sample
project or
IQ Acquisition (Host).vi
to acquire data in DDC mode.
Contents
Software.................................................................................................................................... 2
Documentation.......................................................................................................................... 2
Test Equipment......................................................................................................................... 2
Test Conditions......................................................................................................................... 5
Initial Setup............................................................................................................................... 5
Characterizing the Test System ................................................................................................ 5
Zeroing the Power Sensor................................................................................................. 6
Characterizing Power Splitter Balance............................................................................. 6
Self-Calibrating the NI 5624R.................................................................................................. 9
Self-Calibrating Using MAX............................................................................................ 9
Self-Calibrating Using LabVIEW .................................................................................... 9
As-Found and As-Left Limits................................................................................................... 9
Verification ............................................................................................................................... 10
Verifying Internal Frequency Reference .......................................................................... 10
Verifying Absolute Amplitude Accuracy......................................................................... 12
Updating Calibration Date and Time........................................................................................ 15
Adjustment................................................................................................................................ 16
Adjusting Internal Frequency Reference .......................................................................... 16
Adjusting Absolute Amplitude Accuracy......................................................................... 17
Reverification ........................................................................................................................... 20
Worldwide Support and Services ............................................................................................. 20