NI PXIe-5653 Calibration Procedure | © National Instruments | 11
Verifying LO3 Amplitude Accuracy
This verification ensures that the internal LO3 circuitry is adjusted for correct amplitude
accuracy. Complete the following procedure to determine the as-found status of the NI 5653.
1. Connect the NI 5653 LO3 front panel connector to the power meter.
2. Create a new device session for the NI 5653.
3. Set the RF frequency to 4 GHz and commit the settings to hardware.
4. Check the signal generation status and verify that there are no reported errors or warnings.
5. After correcting for the measurement frequency, use the power meter to measure the LO3
output power.
6. Ensure that the output power is between 7 dBm and 13 dBm.
7. Close the device session.
Verifying LO1 Phase Noise
This verification ensures that the internal LO1 circuitry is adjusted for correct phase noise
accuracy. Complete the following procedure to determine the as-found status of the NI 5653.
1. Connect the NI 5653 LO1 front panel connector to the signal source analyzer RF IN front
panel connector.
2. Create a new device session for the NI 5653.
3. Configure the signal source analyzer as follows:
• Phase noise measurement using cross-correlation PLLs and internal generators
• Automatic DUT detection
• Spur suppression enabled
• Fast Fourier transform (FFT) mode with Blackman-Harris window
• Measurement span from 100 Hz to 10 MHz (offset frequencies)
4. Use the signal source analyzer to perform a manual frequency sweep at the settings shown
in Table 2.
Table 2. LO1 Manual Sweep Settings
Carrier Frequency Offset Resolution Bandwidth Cross Correlation
100 Hz to 300 Hz 10 Hz 100
300 Hz to 1 kHz 30 Hz 1,000
1 kHz to 3 kHz 100 Hz 10,000
3 kHz to 10 kHz 300 Hz 10,000
10 kHz to 30 kHz 1 kHz 10,000
30 kHz to 100 kHz 1 kHz 5,000
100 kHz to 300 kHz 3 kHz 1,000
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