2-2 Spectrum Analyzer Function Verification Performance Verification 1
2-18 PN: 10580-00177 Rev. D MS2721B MM
Spectrum Analyzer Residual Spurious Response
The following test verifies the residual spurious response of the Spectrum Analyzer. This test is performed
using the positive peak detection mode. This test has two parts:
• “Residual Spurious Test with Pre Amp On”
• “Residual Spurious Test with Pre Amp Off”
Required Equipment:
• Spectrum Master Model MS2721B
• 50 ohm termination, Anritsu Model 28N50-2
Residual Spurious Test with Pre Amp On
Procedure:
1. Connect the 50 ohm termination to the Spectrum Analyzer RF In connector as shown in Figure 2-7.
2. Set the MS2721B to Spectrum Analyzer mode and then preset the instrument.
3. Press the Amplitude key, then press the Reference Level soft key.
4. Use the keypad to enter –50 and press the dBm soft key.
5. Press the Atten Lvl soft key and enter 0, then press the dB soft key.
6. Ensure that the Pre Amp On/Off soft key is in the On position. If the Pre Amp is off, then press the
Pre Amp On/Off soft key to turn it On.
7. Press the Shift key and then press the Sweep (3) key, then press the Detection soft key and then the Peak
soft key.
8. Press the BW key and press the RBW soft key.
9. Use the keypad to enter 10 and press the kHz soft key.
10. Press the VBW soft key and use the keypad to enter 1, then press the kHz soft key.
11. Press the Freq key and press the Start Freq soft key.
12. Use the keypad to enter 100 and press the kHz soft key.
13. Press the Stop Freq soft key, enter 10 and press the MHz soft key.
14. Wait until one sweep is completed.
15. Press the Marker key and press the Peak Search soft key.
16. Verify that the Marker 1 amplitude reading is ≤ –100 dBm and record it in Table A-10, “Spectrum
Analyzer Residual Spurious (Pre Amp On)” on page A-5, if required.
17. If a spur with amplitude larger than –100 dBm occurs, then 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.
18. Repeat
Step 11 through Step 16 for the other Start and Stop frequencies listed in Table A-10.
Residual Spurious Test with Pre Amp Off
Procedure:
1. Connect the 50 ohm termination to the Spectrum Analyzer RF In connector as shown in Figure 2-7.
2. Set the MS2721B to Spectrum Analyzer mode and then preset the instrument.
3. Press the Amplitude key, then press the Reference Level soft key.
4. Use the keypad to enter –40 and press the dBm soft key.
5. Press the Atten Lvl soft key and enter 0, then press the dB soft key.
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