605
Functional Tests
Displayed Average Noise Level (DANL)
Single
4. Press Restart, then wait for Average/Hold to display 20/20.
5. Press View/Display, Display, then press Display Line, On.
6. Rotate the knob and set the display line at the average amplitude of the
displayed noise floor by visual inspection.
7. Confirm that the measurement is performed on the analyzer noise floor
and not on a residual response within the displayed 10 kHz span.
NOTE Ignore the residual response if one appears when taking the measurement.
8. Enter the value of the display line as the Measured Average Noise Level at
10 MHz column in Table 16-2 on page 604.
9. Normalize the measured value to a 1 Hz BW by adding –30 dB to the
measured value.
NOTE The –30 dB value is added because the formula used to calculate the value of
the noise power in a 1 Hz BW when measured with a 1 kHz BW is:
Normalized Noise = 10 Log (BW 2/BW 1) where BW 2 is the 1 kHz BW we
measure and BW 1 is 1 Hz BW to which we want to normalize.
Therefore, 10 Log (1000) = 30 dB, so the noise floor will be 30 dB lower in a
1 Hz BW.
10.Enter the normalized value of the displayed average noise level in
Table 16-2 on page 604.
11.The value of the normalized displayed average noise should be less than
the specification value.
12.Change the analyzer center frequency to the next value listed in
Table 16-2 on page 604. Press: FREQ Channel, Center Freq, [Table 2-1
Value], GHz
13.Repeat step 7 through step 12 to fill in the remainder of Table 16-2 on
page 604 for your analyzer frequency range.
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