National Instruments NI PXI-665 Series, Calibration Procedure

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© National Instruments Corporation 7 NI PXI-665x Calibration Procedure
c. Call niSync Connect Clock Terminals VI to connect the oscillator
to
ClkOut .
d. Call niSync Close VI to close the session handle.
3. Complete steps a–c to measure the oscillator frequency through PFI 0.
To obtain an accurate measurement for calibration, the measurement
duration must be made sufficiently long. Refer to Table 1 for the
measurement duration to use.
LabVIEW Block Diagram NI-SYNC C Function Call
Call
niSync_ConnectClkTerminals
with the following parameters:
vi :
“<
SessionHandle
>”
sourceTerminal :
NISYNC_VAL_OSCILLATOR
destinationTerminal :
NISYNC_VAL_CLKOUT
LabVIEW Block Diagram NI-SYNC C Function Call
Call
niSync_close
with the following
parameter:
vi :
“<
SessionHandle
>”
Table 1. Measurement Duration
Device Measure Accuracy
Required Measurement
Duration
NI PXI-6652 200 ppb 0.5 seconds
NI PXI-6653 1 ppb 100 seconds