National Instruments NI PXIe-5673E, Процедура калибровки

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PXIe-5673E Calibration Procedure | © National Instruments | 15
Note
The attenuator is placed in front of the spectrum analyzer to improve the
spectrum analyzer return loss. The power splitter must be characterized so that you
can account for its loss. Refer to the
Characterizing the Power Splitter
section for
more information about how to characterize your power splitter.
1. Connect the input port of the power splitter to the PXIe-5611 RF OUT front panel connector
through the SMA(m)-to-SMA(m) adapter.
2. Connect the PXIe-5650/5651/5652 REF IN/OUT front panel connector to any rubidium
frequency reference rear panel BNC connector through the BNC(m)-to-SMA(m) cable.
3. Connect any available rubidium frequency reference rear panel BNC connector to the
spectrum analyzer REF IN rear panel connector through the BNC(m)-to-BNC(m) cable.
Note
The port used to connect the power splitter to the power sensor in step 8 of
the
Characterizing the Power Splitter
section
must
be the same port used to connect
the power splitter to the power meter in step 4 of this section.
4. Connect port A of the power splitter to the power meter through the SMA(m)-to-N(f)
adapter.
Note
The port used to connect the power splitter to the 6 dB attenuator in step 9 of
the
Characterizing the Power Splitter
section must be the same port used to connect
the power splitter to the 6 dB attenuator in step 5 of this section.
5. Connect port B of the power splitter to the 6 dB attenuator.
6. Connect the available port of the 6 dB attenuator to the spectrum analyzer RF INPUT front
panel connector.
7. Generate a single-sideband tone with a +1 MHz offset from the carrier with the following
niRFSG property settings:
•
Frequency (Hz): 85 MHz
• Power Level (dBm): 5 dBm
• Generation Mode: Arb Waveform
• Reference Clock Source: RefIn
8. Use the power meter to measure power splitter-compensated output power.
Note
Measurements must be adjusted to account for the splitter loss stored in the
Characterizing the Power Splitter
section, as shown in the following equation.
Measurement = power meter reading [i] + splitter loss [i]
9. Repeat steps 7 through 8 for the following frequency ranges in 20 MHz increments,
including endpoints:
•
PXIe-5650: 85 MHz to 1.3 GHz
• PXIe-5651: 85 MHz to 3.3 GHz
• PXIe-5652: 85 MHz to 6.6 GHz
Store the resulting measurements.