3-3 Displayed Average Noise level (DANL) Spectrum Analyzer Performance Verification
3-4 PN: 10580-00307 Rev. D MS20xxC MM
3-3 Displayed Average Noise level (DANL)
The following test is used to verify the displayed average noise level (DANL) of the spectrum analyzer in
VNA Master models MS2036C, MS2037C and MS2038C and is performed using the RMS/Avg detection mode.
Equipment Required
• 50 ohm Termination, Anritsu Model 28N50-2
• 50 ohm Termination, Anritsu Model 28K50 (For MS2038C with Option 11 Only)
Procedure
1. Connect the 50 ohm Termination to the Spectrum Analyzer RF In connector of the MS203xC.
2. Press the On/Off key to turn on the MS203xC.
3. Press the Shift key and then the Mode (9) key. Use the rotary 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 soft key to reset the instrument to the default
starting conditions.
5. Press the Shift key, the Sweep (3) key, press the Sweep Mode soft key. Then press the Performance soft
key to set the instrument to Performance Sweep mode.
Displayed Average Noise Level with Preamp Off
6. Press the Amplitude hard key and then the Reference Level soft key.
7. Enter –20 and press the dBm soft key to set Reference Level to –20 dBm.
8. Press the Atten Lvl soft key.
9. Enter 0 and press the dB soft key to set Atten Lvl to 0 dB.
10. Ensure that the Pre Amp On/Off soft key is in the Off position. If the preamp is On, then press the Pre Amp
On/Off soft key to turn it Off.
11. Press the Detection soft key and then the RMS/Avg soft key.
12. Press the BW hard key and then the RBW soft key.
13. Enter 100 and then press the kHz soft key to set RBW to 100 kHz.
14. Press the VBW soft key.
15. Enter 1 and then press the kHz soft key to set VBW to 1 kHz.
16. Press the VBW/Average Type soft key and ensure that Log is selected.
17. Press the Freq hard key and then the Start Freq soft key.
18. Enter 10 and then press the MHz soft key to set Start Frequency to 10 MHz.
19. Press the Stop Freq soft key.
20. Enter 4 and then press the GHz soft key to set Stop Frequency to 4 GHz.
21. Wait until one sweep is completed.
22. Press the Marker hard key and then the Peak Search soft key.
23. Record the Marker 1 amplitude reading into the Measured Value (100 kHz RBW) column of Table A-10,
“Spectrum Analyzer DANL with Preamp Off” on page A-7 for MS2036C, in Table A-31, “Spectrum
Analyzer DANL with Preamp Off” on page A-17 for MS2037C or in Table A-55, “Spectrum Analyzer
DANL with Preamp Off” on page A-30 for MS2038C in Appendix A.
Note Before continuing, allow a 30-minute warm up for the internal circuitry to stabilize.
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