Chapter 5
159
Functional Testing
Displayed Average Noise Level (DANL)
Displayed Average Noise Level (DANL)
Test Limits
The DANL test results should be within the following limits in the four
frequency ranges tested:
Test Description
The DANL test is a measurement of the noise generated internally by
the instrument. With the RF 50
Ω
input terminated in a 50
Ω
load, the
DANL is measured at several frequencies. A visual check is made to
ensure the measurement is not done in the presence of a spurious
response.
Required Equipment
Figure 5-4
DANL/Noise Figure Test Setup
Table 5-12
Frequency
Limits (dBm)
7 MHz to 20 MHz
≤ −
90
20 MHz to 2 GHz
≤ −
106
2 GHz to 3 GHz
≤ −
103
3 GHz to 4 GHz
≤ −
98
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