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 Table3-3 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 50Ω 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 50Ω Type-N(m) 909A Option 012