Displayed Average Noise Level (RF1 and RF2) Performance Test

With the E.10.00 release, this test is now run as two separate tests: the first for RF Input 1 and the second test will be run on RF Input 2 which will be a functional test. This topic covers both tests.

Displayed Average Noise Level (DANL) tests the average of the displayed noise. To measure DANL, the EMI receiver’s input is terminated with a 50 ohm load. The DUT is placed in zero span, and the trace data is averaged by summing all 1000 trace points and dividing by 1000. The resulting number is normalized to 0 dB input attenuation by subtracting out the attenuation setting. The result is then normalized to 1 Hz Radiant Bandwidth (RBW) by subtracting out the value of 10 x LOG(RBW). If the DUT has the preamp option, additional testing is performed with the preamp on. All tests are performed in DC-Coupled mode.

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Required Test Equipment

Test Equipment	Model Number1
Termination, 50 ohm	909A Option 012
Termination, 3.5 mm (m) For Option 526	909D
Termination, 2.4 mm (f) For Option 544	85138B
Adapter, 3.5 mm (f) to 3.5 mm (f) For Option C35	83059B
Adapter, Type-N (m) to 3.5 mm (f)2 For Option 526	1250-1744
Adapter, Type-N (m) to 2.4 mm (m)3 For Option 544	11903A

Refer to the main Required Equipment table for a list of alternative models. This adapter is only required when the 3.5 mm termination is used for Option 526 RF Input 2. This adapter is only required when the 2.4 mm termination is used for Option 544 RF Input 2.

 

For Option 503 and 508, Type-N termination will be used in both RF Input 1 and RF Input 2. For Option 526, 3.5 mm termination will be used in RF Input 1, and the user can choose either to use 3.5 mm termination with an adapter or Type-N termination in RF Input 2. For Option 544, 2.4 mm termination will be used in RF Input 1, and the user can choose either to use 2.4 mm termination or Type-N termination in RF Input 2.

Connection Setups

Displayed Average Noise Level, RF Input 2 Test Setup