Keysight N9038A, Service Manual, Page: 652 / 745

Keysight N9038A MXE Service Guide 671
Tests
Displayed Average Noise Level (DANL)
Displayed Average Noise Level (DANL)
Test Limits
See test limits in Table 22-3 and Table 22-4 .
Overview
The Displayed Average Noise Level (DANL) of the EMI receiver is measured
across a 10 kHz frequency span at several center frequencies. The receiver
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.
This measurement is performed for both RF inputs.
Figure 22-1 DANL Test Setup
Table 22-2 Displayed Average Noise Level (DANL) - Required Equipment
Item
Critical Specifications
(for this test)
Recommended
Keysight Model
Termination, 50
Ω
Type-N (m)
Frequency: DC to 18 GHz 909A Option 012
Termination, 50
Ω
a
3.5 mm (f)
Frequency: DC to 26 GHz 909D Option 011
Termination, 50
Ω
b
2.4 mm (f)
Frequency: DC to 50 GHz 85138B
a. Only required for Option C35 (3.5 mm RF Input 1)
b. Only required for Option 544 (44 GHz Frequency Range)