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Performance ver

iﬁcation

DANL (Displayed Average Noise Level)

The intent of the DANL test is to measure 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 5

0  N termination to the RSA306B RF Input.

2. Reset the R

SA306B to factory defaults (Presets > Main).

3. Run the RS

A306B alignment procedure (Tools > Alignments > Align Now).

4. Set the RS

A306B as follows:

a. Referenc

e Level = –50 dBm to –90 dBm.

The refe

rence 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 of spurious.

b. Set Detection = Avg (Vrms) (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 PO WER measurement:

a. Marker function = Power (dBm/Hz) (Markers > Deﬁne Markers > Readouts (near bottom of screen) > Power)

b. Turn on marker (M ar ker s > Deﬁne Markers > Add)

6. Set the RSA306B to each of the center frequencies listed in the DANL frequencies of interest table. (See Table 13 on

page 32.) After averaging is completed, move the marker 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 marker noise level

amplitude in the DANL frequencies of interest table and the test record and compare with the speciﬁcation.

RSA306B Speciﬁcations and Performance Veriﬁcation 31

Tektronix RSA306B Technical Reference

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