604
Functional Tests
Displayed Average Noise Level (DANL)
Displayed Average Noise Level (DANL)
Test Limits (with 0 dB input attenuation)
See Table 16-2 for values.
The Displayed Average Noise Level (DANL) of the signal analyzer is measured
across a 10 kHz frequency span at several center frequencies. The analyzer
input is terminated into a 50W 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 16-1 DANL Test Setup
Procedure
1. Configure the equipment as shown in Figure 16-1
2. Press Mode, Spectrum Analyzer, Mode Preset on the analyzer.
3. Set up the signal analyzer by pressing:
FREQ Channel, Center Freq, 10, MHz
Input/Output, RF Input, RF Coupling, select DC
SPAN X Scale, Span, 10, kHz
AMPTD Y Scale, –70, dBm
AMPTD Y Scale, Attenuation, Mech Atten, 0, dB
BW, Res BW, 1, kHz
BW, Video BW, 100, Hz
Meas Setup, Average/Hold, Number, 20, Enter
Trace/Detector, Trace Average
Table 16-2 DANL Measurement Requirements
Item
Critical Specifications
(for this test)
Recommended
Keysight Model
Termination, 50W Type-N (m) Frequency: DC to 18 GHz 909A Option 012
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