NFA — N8973B/74B/75B/76B
Power bandwidth (aka, noise bandwidth) is defined as the width (in Hz) of a perfect rectangular frequency-response envelope whose maximum power level is the same as the maximum power of the complex signal under test, and whose integrated power (in Watts) is the same as that of the complex signal spectrum.
In this test, the power bandwidth function is checked at a CW frequency of 50 MHz for resolution bandwidths from 3 Hz to 1.2 MHz in a 1, 3, 10 sequence. The signal source is the internal 50 MHz calibrator signal. The power bandwidth function reads the integrated power between a marker pair which enclose the CW signal. This power is compared to the peak power of the CW signal, as read by the DUT marker.
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