Performance ver
ification
DANL (Displayed Average Noise Lev el)
The intent of the DANL test is to m easure the average internal noise level of the instrument. The DANL specification does
not cover residual spurs. If the specific measurement frequency results in measuring a residual spur that is visible above
the noise level, the DANL specification applies not to the spur but to the noise level on either side of the spur. Please
refer to the Spurious Response specifications.
1. Connect a 50 N termination to the RSA306 RF Input.
2. Reset the RSA306 to factory defaults (Presets > Main).
3. Run the RSA 306 alignment procedure (Tools > A lignments > Align Now).
4. Set the RSA306 as follows:
a. Reference Level = –50 dBm to –90 dBm.
The reference level can be set lower than -50 dBm to display the noise on screen. This helps avoid measuring on
spurious signals since it is easier to determine the presence o f spurious.
b. Set Detection = Avg (V rms) (Setup > Settings > Traces > Detection > Avg).
c. Set Function = Avg (of logs) (Setup > Settings > Traces > Function)
d. Averaging = 100 (Setup > Settings > Traces > Function: select 100 in field)
e. Filter shape = Flat-Top (Setup > Settings > BW > Filter Shape > Flat-top).
f. Center Frequency = 22 MHz
g. Span = 100 kHz
h. RBW = Auto (100 Hz)
5. Set the marker for POWER m easurement:
a. Marker function = Power (dBm/Hz) (M arkers > Define Markers > Readouts (near bottom of screen) > Power)
b. Turn on marker (Markers > Define Markers > Add)
6. Set the RSA306 to each of the center frequencies listed in the DANL frequencies of interest table. (See Table 13 on
page 30.) After averaging is completed, move the m arker near the center screen to the baseline noise on either side of
the center screen spurious. M ake sure the marker is not on a coherent spurious signal. Enter the m arker noise level
amplitude in the DANL frequencies of interest table and the test record and compare with the specification.
29 RSA306 Specifications and Performance Verification
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