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Functional Tests
Displayed Average Noise Level (DANL)
6. Rotate the knob and set the display line at the average amplitude of the
7. Confirm that the measurement is performed on the analyzer noise floor
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
9. Normalize the measured value to a 1 Hz BW by adding –30 dB to the
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:
10.Enter the normalized value of the displayed average noise level in.
11.The value of the normalized displayed average noise should be less than
12.Change the analyzer center frequency to the next value listed in
13.Repeat
Table 18-2
Displayed Average Noise Level (DANL) Results
Center Frequency
10 MHz
2 GHz
6 GHz
13 GHz
20 GHz
26.5 GHz
N9030A PXA Signal Analyzer Service Guide
displayed noise floor by visual inspection.
and not on a residual response within the displayed 10 kHz span.
10 MHz column in
Table
measured value.
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.
18-2
the specification value.
18-2. Press: FREQ Channel, Center Freq, [Table 2-1 Value], GHz
step 4
through
your analyzer frequency range.
Measured Average Noise Level (dBm)
18-2.
step 12
to fill in the remainder of
Normalized Average Noise Level/(1 Hz
BW) (dBm)
Table
Table
Table 18-2
for
Test Limits
(dBm)
–153
–151
–148
–147
–141
–135
569
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Troubleshooting
