National Instruments PXIe-6674 User Manual

Contents

National Instruments PXIe-6674 User Manual Manual pdf 25 page image

Refer to Figure 4. on page 15 and Figure 5. on page 16 for an illustration of how thePXIe-6674 performs synchronous routing operations.CalibrationThis chapter discusses the calibration of the PXIe-6674.Calibration consists of verifying the measurement accuracy of a device and correcting for anymeasurement error. The PXIe-6674 is factory calibrated before shipment at approximately25 °C to the levels indicated in the device's specifications. The associated calibration constants—the corrections that were needed to meet specifications—are stored in the onboard non-volatile memory (EEPROM). The driver software uses these stored values.Factory CalibrationThe factory calibration of the PXIe-6674 involves calculating and storing four calibrationconstants. These values control the accuracy of two features of the device, which are discussedin the following sections.OXCO FrequencyThe OCXO frequency can be varied over a small range. The output frequency of the OCXO isadjusted using this constant to meet the specification listed in the PXIe-6674 Specifications.PXI_CLK10 PhaseWhen using the PLL to lock PXI_CLK10 to an external reference clock, the phase between theclocks can be adjusted. The time between rising edges of PXI_CLK10 and the input clock isminimized using this constant.Note The PXI_CLK10 phase is set during manufacturing and does not need to berecalibrated.ComplianceElectromagnetic Compatibility InformationThis hardware has been tested and found to comply with the regulatory requirements andlimits for electromagnetic compatibility (EMC) as indicated in the hardware's Declaration ofConformity (DoC).4 The Declaration of Conformity (DoC) contains important EMC compliance information andinstructions for the user and installer. To obtain the DoC for this product, visit ni.com/certification,search by model number or product line, and click the appropriate link in the Certification column.PXIe-6674 User Manual | © National Instruments | 25