Spectrum Analyzer Verification 2-8 Displayed Average Noise Level (DANL)
MT8212E and MT8213E MM PN: 10580-00255 Rev. J 2-19
2-8 Displayed Average Noise Level (DANL)
The following test is used to verify the Displayed Average Noise Level (DANL) of the spectrum analyzer
systems in the MT821xE Cell Master. This test is performed using the RMS detection mode.
Equipment Required
• Anritsu 28N50-2 50 ohm Termination
Procedure
1. Connect the 50 ohm Termination to the MT821xE Spectrum Analyzer RF In connector.
2. Press the On/Off key to turn On the MT821xE Cell Master.
3. On the MT821xE, press the Shift key and then the Mode (9) key. Rotate the knob to highlight
Spectrum Analyzer and then press the Enter key to switch to Spectrum Analyzer mode.
4. Press the Shift key, the Preset (1) key, and then the Preset submenu key to reset the instrument to the
default starting conditions.
5. Press the Shift key, then the Sweep (3) key, then the Sweep Mode key, and then press the Performance
submenu key.
6. Press the Amplitude main menu key, then press the Reference Level submenu key.
7. Use the keypad to enter –20 and press the dBm submenu key.
8. Press the Atten Lvl submenu key and enter 0, then press the dB submenu key.
9. Make sure that the Pre Amp is Off.
10. Press the Amplitude main menu key, then press the Detection submenu key, and then press the
RMS/AVG soft key.
11. Press the BW submenu key and press the RBW submenu key.
12. Use the keypad to enter 100 and press the kHz submenu key.
13. Press the VBW submenu key.
14. Use the keypad to enter
1 and press the kHz submenu key.
15. Press the Freq main menu key and press the Start Freq submenu key.
16. Use the keypad to enter 10 and press the MHz submenu key.
17. Press the Stop Freq submenu key, enter 2.4, and press the GHz submenu key.
18. Wait until one sweep is completed.
19. Press the Marker main menu key, and then press Peak Search submenu key.
20. Record the Marker reading into the test records. Use the Measured Value at 100 kHz RBW column of
Table A-11, “Spectrum Analyzer DANL with Pre Amp Off” on page A-11.
21. Repeat Step 15 through Step 20 for the other frequency settings in Table A-11 that are applicable for the
instrument under test. Change the VBW setting as indicated in the VBW column of Table A-11.
Caution Before continuing, allow a 30 minute warm-up period for the internal circuitry to stabilize.
Note
The noise floor consists of totally random signals in which a spur is a fixed spike of varying amplitude
that is always visible.
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