Displayed Average Noise Level Test

This test applies to the following models:

N9913A/14A/15A/16A/17A/18A with Option 233
N9913B/14B/15B/16B/17B/18B with Option 233
N9935A/36A/37A/38A
N9933B/34B/35B/36B/37B/38B
N9950A/51A/52A with Option 233
N9960A/61A/62A

The purpose of Displayed Average Noise Level (DANL) test is to test the average of the displayed noise. To measure the average of the DANL, the analyzer's input is terminated with a 50 ohm load. The analyzer is placed in 1 kHz span, and the trace data is averaged by summing all 1000 trace points and dividing by 1000. The result is then normalized to 1 Hz RBW by subtracting out the value of 10 x LOG(RBW).

If the DUT has the preamp Option 235, additional testing is performed with the preamp on. All tests are performed in DC-Coupled mode. The test is performed at predetermined frequencies and in 1 kHz span. This avoids measuring residuals.

Test type:	performance
Related specification:	Displayed Average Noise Level (DANL)
Related adjustment:	none

Required Test Equipment

Test Equipment	Recommended Model (see main equipment list for alternative models)
50 W termination, Type-N (m)	909A Opt. 012
50 W termination, 3.5 mm (f) For N9918A/B, N9938A/B	909D Opt. 011
50 W termination, 2.4 mm (f) For N995xA, N996xA	85138B
Adapter, Type-N (m) to 3.5 mm (m) For N9918A/B, N9938A/B without Option 100	1250-1743

Connection Setups

The following notes apply to illustrations in the FieldFox Help:

Only a single representative model will be shown.
Some illustrations may differ than those in TME.
For procedures that apply to multiple ports, illustrations will show the setup on only one test port.

Displayed Average Noise Level Test

This test applies to the following models:

Required Test Equipment

Connection Setups

Displayed Average Noise Level Test Setup