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Chapter 3 107
PSA Functional Tests
Displayed Average Noise Level (DANL)
PSA Functional Tests
Displayed Average Noise Level (DANL)
Test Limits (with 0 dB input attenuation)
See Table 3-3 for values.
Test Description
The Displayed Average Noise Level (DANL) of the spectrum analyzer is measured across a
10 kHz frequency span at several center frequencies. The analyzer input is terminated into
a 50
Ω load. A test is performed to assure the measurement is not performed in the
presence of a residual response. The measurement is then averaged, and the result is
normalized to a 1 Hz bandwidth.
Figure 3-3 DANL Test Setup
Procedure
1. Configure the equipment as shown in Figure 3-3.
2. Press
Preset (Factory Preset) on the analyzer.
3. Set up the spectrum analyzer by pressing:
FREQUENCY, Center Freq, 5. MHz
Input/Output
, RF Coupling, DC
Span, 10 kHz
AMPLITUDE
, –70, dBm
Amplitude
, Attenuation, 0, dB
BW/Avg
, 1, kHz
Video BW, 100 Hz
Average
(On), 20, Enter
Item
Critical Specifications
(for this test)
Recommended
Agilent Model
Termination 50
Ω Type-N(m) 909A Option 012