ni5660 Configure Reference Clock

Use this function to configure the reference clock source for the RF Signal Analyzer. Reference clock source options include the high-stability oven-controlled crystal oscillator (OCXO) onboard the RF downconverter module (On Board Clock), a 10 MHz reference clock from an external source (Ref In), or the PXI backplane (PXI Clock 10). You can optionally use this VI to drive the PXI backplane using the specified reference clock source.

receiver info in is the instrument handle that you obtain from the ni5660 Initialize VI. The handle identifies a particular RF Signal Analyzer session.

clock source specifies the RF Signal Analyzer reference clock source. Select one of the following options: Ref In Locks the RF downconverter module reference to an external reference signal connected to the FREQ REF IN connector on the RF downconverter module front panel. On Board Clock Sets the RF downconverter module internal reference clock as the RF downconverter module timebase. PXI Clock 10 Locks the RF downconverter module internal reference to the PXI backplane. This option is useful only when the onboard PXI clock is locked to a more accurate reference (such as a PXI-6608 or another RF downconverter module) installed in PXI Slot 2. To use this option, connect the PXI 10 MHz I/O connector to the FREQ REF IN connector on the RF downconverter module front panel. Default Value: On Board Clock

drive backplane clock specifies whether the reference clock specified in the clock source parameter is propagated to the PXI backplane. When drive backplane clock is FALSE (default), the PXI backplane is independent of the RF Signal Analyzer timebase. When drive backplane clock is TRUE, the PXI backplane is driven by the specified RF Signal Analyzer clock source. Default Value: FALSE

Note  This option is only available when the RF downconverter module is installed in PXI Slot 2, and the PXI 10 MHz I/O connector is wired to the 10 MHz OUT connector on the NI 5600 RF downconverter module front panel as shown in Overview.

digitizer PLL lock time (sec) specifies time in seconds for which the digitizer module reference clock must be phase-locked to the 10 MHz reference of the downconverter module before execution. For most measurements, the PLL may be considered stable after 1 second, but NI recommends a digitizer PLL lock time of 4 seconds to ensure complete settling and utmost accuracy for phase measurements. Default Value: 1.0 second Tip  Setting digitizer PLL lock time to 0 means that the VI does not wait for the PLL to settle before returning. Use this option when it is acceptable for your program to continue executing while the digitizer module PLL settles in the background.

error in accepts error information wired from previously called VIs. The pop-up option Explain Error (or Explain Warning) gives more information about the error displayed. status boolean is either TRUE (X) for an error, or FALSE (checkmark) for no error or a warning. The pop-up option Explain Error (or Explain Warning) gives more information about the error displayed. code input identifies the error or warning. The pop-up option Explain Error (or Explain Warning) gives more information about the error displayed. source string describes the origin of the error or warning. The pop-up option Explain Error (or Explain Warning) gives more information about the error displayed.

receiver info out passes a reference to your instrument session to the next VI. receiver info was obtained from the ni5660 Initialize VI. Note  Do not modify the contents of this wire manually.

error out passes error or warning information out of a VI to be used by other VIs. The pop-up option Explain Error (or Explain Warning) gives more information about the error displayed. status is TRUE (X) if an error occurred, or FALSE (checkmark) for no error or a warning. The pop-up option Explain Error (or Explain Warning) gives more information about the error displayed. code identifies the error or warning. The pop-up option Explain Error (or Explain Warning) gives more information about the error displayed. source describes the origin of the error or warning. The pop-up option Explain Error (or Explain Warning) gives more information about the error displayed.