Performance Verification 1 2-2 Spectrum Analyzer Function Verification
MS2721B MM PN: 10580-00177 Rev. D 2-17
Spectrum Analyzer Displayed Average Noise Level (DANL)
The following test can be used to verify the Displayed Average Noise Level of the MS2721B. This test is
performed using the RMS detection mode, first with Pre Amp on, then with Pre Amp off.
Required Equipment:
• Spectrum Master Model MS2721B
• 50 ohm termination, Anritsu Model 28N50-2
Procedure:
1. Connect the 28N50-2 50 ohm termination to the MS2721B Spectrum Analyzer RF In port.
2. Set the MS2721B to Spectrum Analyzer mode and then preset the instrument.
3. Press the Amplitude function hard key, set Attenuation Level to 0 dB, and set the Reference Level
to –50 dBm.
4. Press the Pre Amp On/Off soft key to turn it ON.
5. Press the Amplitude soft key and then press Detection soft key, then press RMS (a red dot appears on the
RMS label).
6. Press the BW function hard key and select an RBW of 100 kHz.
7. Enter the Start and Stop frequencies into the MS2721B from the first 2 columns in Table A-8, “Spectrum
Analyzer DANL (Pre Amp On)” on page A-4.
8. Wait until one sweep has been completed.
9. Press the Marker key and press Peak Search.
10. Record the Marker reading in the “Measured Power (100 k RBW)” column of Table A-8.
11. Repeat Step 7 through Step 10 for the other frequencies in Table A-8.
12. For each measured 100 kHz value in Table A-8, convert the measured value to a 1 Hz RBW value by
subtracting 50 dB. (For example, if the marker shows a value of –110 dBm at 100 kHz RBW, then the
computed value at 1 Hz RBW is –160 dBm.) Enter the computed values in Table A-8.
13. Press the Amplitude function hard key.
14. Set Reference Level to –20 dBm and set the Pre Amp to Off.
15. Repeat Step 7 through Step 11 for the Pre Amp Off measurements.
16. Enter the computed 1 Hz RBW values in Table A-9.
Figure 2-7. Spectrum Analyzer DANL Test Setup
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