Displayed Average Noise Level (Danl); Procedure - Keysight N9000A Service Manual

Functional Tests

Displayed Average Noise Level (DANL)

Displayed Average Noise Level (DANL)
Test Limits (with 0 dB input attenuation)
See
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.
Item
Termination, 50Ω Type-N(m)
Figure 15-1 DANL Test Setup

Procedure

1. Configure the equipment as shown in
2. Press
3. Set up the signal analyzer by pressing:
294
Table 15-1 for values.
Critical Specifications
(for this test)
Frequency: DC to 18 GHz
,
Mode Spectrum Analyzer
,
FREQ Channel Center Freq
Input/Output, RF Input
,
SPAN X Scale Span
, –70,
AMPTD Y Scale
,
AMPTD Y Scale Attenuation
, , 1,
BW Res BW kHz
, , 100,
BW Video BW
Meas Setup, Average/Hold, Number
Trace/Detector, Trace Average
Single
Figure 15-1
,
Mode Preset
, 10,
MHz
, , select
RF Coupling
, 10,
kHz
dBm
, , 0,
Mech Atten
Hz
, 20,
Enter
Recommended
Agilent Model
909A Option 012
on the analyzer.
DC
dB
Chapter 15