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NI PXIe-5694 Calibration Procedure
Verifying Third-Order Intercept Point Out-of-Band
Complete the following procedures to determine the as-found status of the NI 5694. Third-order
intercept point out-of-band (TOI-OB) places one signal within the passband and a second signal
outside the passband.
Note
Refer to the values recorded during system characterization to complete these
procedures.
Determining the Path Gain
Complete the following procedure to determine system path gain.
1.
Ensure that the RF source 1 output is OFF and the RF source 2 output is ON.
2.
Configure the RF source 2 generator as follows:
•
Power level: -20 dBm
•
Frequency: 193.6 MHz
3.
Configure the spectrum analyzer as follows:
•
Center frequency: 193.6 MHz
•
Span: 0 Hz
•
Reference level: 0 dBm
•
Resolution bandwidth: 10 kHz
•
Video bandwidth: 30 kHz
•
Number of averages: 100
4.
Configure the NI 5694 as follows:
•
Reference level: -30 dBm
•
IF output power level: +10 dBm
•
IF conditioning downconversion enabled: Disabled
•
Device instantaneous bandwidth: The first value shown in the
Device Instantaneous
Bandwidth
column in Table 6
•
Step gain: The value in the
Step Gain
column in Table 6 corresponding to the
configured device instantaneous bandwidth
Table 6.
Path Gain, Downconversion Disabled
Device
Instantaneous
Bandwidth (Path)
Step Gain
IF OUT Power
(dBm)
Path Gain
20 MHz
Disabled
Enabled
5 MHz
Disabled
Enabled
