3.
If the IF digitizer module fails to phase-lock to the PXI backplane driven by the NI 5600
RF downconverter module internal reference, verify the following items:
a)
Verify that the NI 5600 is in Slot 2 of the PXI chassis, immediately adjoining the
PXI controller slot.
b)
Verify that the PXI 10 MHZ I/O connector is securely wired to one of the
10 MHZ OUT connectors using the included cable.
c)
(NI 5600) Verify that in the niRFSA Configure PXI Chassis Clk10 VI, the
PXI
Clk10 source
parameter is set to OnboardClock or that in the
niRFSA_ConfigurePXIChassisClk10
function, the PXIClk10Source
parameter is set to NIRFSA_VAL_ONBOARD_CLOCK_STR.
If failures continue and there is no signal at these output terminals, there may be a problem
with the NOT USED hardware. Contact NI technical support or visit
Related Information
Interconnecting the NI 5661 Modules
on page 6
What Should I Do if the NI-RFSA Soft Front Panel Does Not
Launch?
1.
Verify the front panel interconnections for your RF vector signal analyzer.
2.
Verify the MAX device association for your NI 5661.
3.
If you have verified the interconnections and associations of your device and you are still
unable to launch the NI-RFSA SFP, try uninstalling and then reinstalling NI-RFSA.
Related Information
Interconnecting the NI 5661 Modules
on page 6
Configuring the NI 5661 in MAX
Measurements
What Should I Do if the Device Amplitude Reading Does Not
Match the Source?
1.
Verify that the discrepancy between the NI 5661 and the source is within the error limits
of the devices.
a)
Verify the absolute amplitude accuracy of the NI 5661 using the appropriate value.
b)
Verify the level accuracy of the input signal into the receiver.
2.
Check for cable loss, which can be substantial. For example, an RG58 coaxial cable loses
about 2.1 dB of signal amplitude per foot at 2 GHz. Unless you are using high-quality
cables, expect losses when working with high-frequency signals.
3.
Perform a self-calibration for the NI 5661.
If errors continue, contact NI technical support or visit
.
NI PXI-5661 Getting Started Guide
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© National Instruments
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