NI PXI-5650/5651/5652 Calibration Procedure | © National Instruments | 9
Verifying Frequency Accuracy
Complete the following steps to verify the frequency accuracy of the PXI-5650/5651/5652
module using a spectrum analyzer:
1. Connect the 6 dB precision attenuator to the PXI-5650/5651/5652 RF OUT front panel
connector.
2. Connect the spectrum analyzer RF INPUT connector to the 6 dB precision attenuator.
3. Connect the rubidium 10 MHz frequency reference signal to the spectrum analyzer REF IN
rear panel connector.
4. Configure the spectrum analyzer with the following settings:
• Center frequency: 400 MHz
• Reference level: -20 dBm
• Resolution bandwidth: 100 Hz
• Span: 100 kHz
• Reference Clock source: External
• Frequency counter resolution: 1 Hz
5. Generate a signal after setting the following NI-RFSG property settings:
• Frequency (Hz): 400 MHz
• Power Level (dBm): -20 dBm
• Generation Mode: CW
• Reference Clock source: Onboard Clock
6. Use the spectrum analyzer to measure the frequency of the peak tone.
7. Verify that the measurement in step 6 is within the limits in Table 3, with respect to
400 MHz.
Verifying High Power Level Accuracy
Complete the following steps to verify the high power level accuracy of the
PXI-5650/5651/5652 module using a power meter:
1. Connect the PXI-5650/5651/5652 REF IN/OUT front panel connector to the rubidium
10 MHz frequency reference signal.
2. Connect the PXI-5650/5651/5652 RF OUT front panel connector to the power meter
thermal sensor.
3. Generate a single-tone signal after setting the following NI-RFSG property settings:
• Frequency (Hz): 500 kHz
• Power Level (dBm): 5 dBm
• Generation Mode: CW
• Reference Clock source: RefIn
Table 3. Frequency Accuracy Test Limit
Device Test Limit
PXI-5650/5651/5652 9 ppm
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