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SPECTRAN V6 PLUS DANL (NF) with and without optional Preamplifier

  1. I am using a RSA250X without preamplifier. Which DANL do I reach with and without preamplifier?

The typical DANL without preamplifier (Reflevel @ -38dBm) should be within -165dBm/Hz which is an excellent value.

With preamplifier you should reach a whopping -170dBm/Hz (Reflevel @ -60dBm) or even better.

How was this measurement done? With a zero span and 1Hz RBW?

The setting does not really matter:

Sweep and real-time mode both offer quite the same DANL same with the RBW setting.