Anritsu S412E Maintenance Manual page 27

Chapter 3 — Spectrum Analyzer Verification
DANL Test with Preamp On
21. Touch the Amplitude button on the touchscreen main menu and set the Reference Level to –50 dBm.
22. Touch the Pre Amp On/Off submenu button to turn the preamp On.
23. Touch the Freq main menu button and set the Start Freq to 10 MHz.
24. Touch the Stop Freq submenu button and set it to 1.6 GHz.
25. Wait until one sweep is completed.
26. Touch the Marker main menu button and then the Peak Search submenu button.
27. Record the Marker 1 amplitude reading into the 100 kHz RBW Measured Value column in
"Spectrum Analyzer DANL with Preamp On" on page
The noise floor consists of totally random signals where a spur is a fixed spike of varying amplitude
Note
that is always visible.
28. Repeat Step 23 through
29. For each measured 100 kHz RBW value in
40 dB from the 100 kHz RBW measured value.
For example, if the marker shows a value of –100 dBm at 100 kHz RBW, the calculated value at
10 Hz RBW is –140 dBm (–100 dBm – 40 dB = –140 dBm).
30. Enter the calculated values into the 10 Hz RBW Calculated Value column in
31. Verify that the calculated value is less than or equal to the value in the Specification column in
Table A-6.
S412E MM
Step 27 for other frequency settings in
Table
PN: 10580-00324 Rev. N
3-4 Displayed Average Noise Level (DANL)
A-4.
Table A-6
A-6, normalize it to 10 Hz RBW value by subtracting
Table A-6,
if Option 6 is installed.
Table A-6.
3-7