2-9 Residual Spurious Response Verification Chapter 2 — Spectrum Analyzer Verification
2-20 PN: 10580-00342 Rev. D MS2720T MM
2-9 Residual Spurious Response Verification
The following two tests are used to verify the residual spurious response of the Spectrum Analyzer of the
MS2720T Spectrum Master and is performed using the positive peak detection mode. The two parts to this test
are the “Residual Spurious Response Test with Preamp Off” immediately below and the “Residual Spurious
Response Test with Preamp On” on page 2-21.
Residual Spurious Response Test with Preamp Off
Equipment Required for MS2720T with option 709, 713 or 720
• Anritsu 28N50-2 50 ohm Termination
Equipment Required for MS2720T with option 732 or 743
• Anritsu 28KF50 50 ohm Termination
Procedure
1. Connect the 50 ohm termination to the Spectrum Analyzer RF In connector.
2. Set the MS27xC to Spectrum Analyzer mode and then Preset the instrument. Press the Shift key, the
Sweep (3) key, Sweep Mode submenu key and then the Performance submenu key.
3. Press the Amplitude key, then press the Reference Level submenu key.
4. Use the keypad to enter –40 and press the dBm submenu key.
5. Press the Atten Lvl submenu key and enter 0, then press the dB submenu key.
6. Confirm that the Pre Amp On/Off submenu key is in the Off position. If the preamp is On, then press the
Pre Amp On/Off submenu key to turn it Off.
7. Press the Detection submenu key and then the Peak submenu key.
8. Press the Freq main menu key and press the Start Freq submenu key.
9. Use the keypad to enter 9, and press the kHz submenu key.
10. Press the Stop Freq submenu key, enter 100, and press the kHz submenu key.
11. Press the BW main menu key and press the RBW submenu key.
12. Use the keypad to enter 300, and press the Hz submenu key.
13. Press the VBW submenu key and use the keypad to enter 10, then press the
Hz submenu key.
14. Wait until one sweep is completed.
15. Press the Marker main menu key and press the Peak Search submenu key.
16. Record the Marker 1 amplitude reading and verify that it is ≤ –90 dBm in Table A-58, “Spectrum
Analyzer Residual Spurious (Preamp Off)” on page A-31.
17. Repeat Step 8 through Step 16 for the other Start and Stop frequencies with the RBW and VBW as listed
in Table A-58 and verify that the readings are within the listed specifications. Note to stop at the
applicable frequency limit of the model under test as listed below:
• 9 GHz for MS2720T with option 709
• 13 GHz for MS2720T with option 713
• 20 GHz for MS2720T with option 720
• 32 GHz for MS2720T with option 732
• 43 GHz for MS2720T with option 743
Note
If a spur with an amplitude larger than –90 dBm occurs, wait another full sweep and observe
whether the spur occurs at the same point on the second sweep. If the spur does not occur at the
same point on the second sweep, then the spur on the first sweep was not real.
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