636 Keysight N9010A EXA Service Guide
Functional Tests
Displayed Average Noise Level (DANL)
Displayed Average Noise Level (DANL)
Test Limits (with 0 dB input attenuation)
See Table 17-1 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 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 17-1 DANL Test Setup
Procedure
1. Configure the equipment as shown in Figure 17-1
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 (except Options 532
and 544)
SPAN X Scale, Span, 10, kHz
AMPTD Y Scale, –70, dBm
AMPTD Y Scale, Attenuation, Mech Atten, 0, dB
BW, Res BW, 1, kHz
Item
Critical Specifications
(for this test)
Recommended
Keysight Model
Termination, 50Ω Type-N (m)
a
Frequency: 10 MHz to 18 GHz 909A Option 012
Termination, 50Ω 2.4 mm (f)
b
Frequency: 10 MHz to 50 GHz 85138B
a. For Options 503, 507, 513, and 526
b. For Options 532 and 544
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