3-3 Residual Spurious Response Chapter 3 — Spectrum Analyzer Verification
3-4 PN: 10580-00324 Rev. N S412E MM
3-3 Residual Spurious Response
The following test is used to verify the residual spurious response of the spectrum analyzer of the S412E.
Equipment Required
• 50 Ohm Termination, Anritsu Model 28N50-2
Procedure
1. Connect the 50 Ohm Termination to the RF In connector of the S412E.
2. Power on the S412E and put the instrument into Spectrum Analyzer mode with the Menu button.
3. Preset the S412E by pressing the Shift key, then the Preset (1) key, then the Preset button on the
touchscreen.
4. Press the Amplitude submenu button.
5. Touch the Detection submenu button and then the Peak submenu button.
6. Press the Sweep menu, then change the Sweep Mode to Performance.
Residual Spurious Test with Preamp Off
7. Set the Reference Level to –40 dBm using the Amplitude menu on the touchscreen.
8. Set the Attenuation Level to 0dB using the Atten Lvl submenu.
9. Make sure that the Pre Amp On/Off submenu button is in the Off position. If the preamp is on, then touch
the Pre Amp On/Off submenu button to turn it off.
10. Set the Start Freq to 10 MHz using Freq menu on the touchscreen.
11. Set the Stop Freq to 1.6 MHz.
12. Set the RBW to 3kHz using the BW menu.
13. Set the VBW to 1kHz.
14. Wait until one sweep is completed.
15.
Touch the Marker main menu button and then the Peak Search submenu button.
16. Verify that Marker 1 amplitude is <
–90 dBm.
17. Record the Marker 1 amplitude reading in Table A-3, “Spectrum Analyzer Residual Spurious Response
with Preamp Off” on page A-3.
18. Repeat this procedure with a Start Frequency of 1.6 GHz and Stop Frequency of 6 GHz if Option 6 is
installed, and record results in Table A-3.
Note Before continuing, allow a 30-minute warm up for the internal circuitry to stabilize.
Note
If a spur larger than –90 dBm appears, wait another full sweep and observe whether the spur
re-appears at the same point on the second sweep. If the spur does not appear at the same point on
the second sweep, then the spur on the first sweep was not real.
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