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In this case the SA’s input is one meter of wire acting as an antenna.Ī couple of things to note: first, while the DSA815 and all other SA’s will display amplitude in a variety of units, the most useful is dBm, or dB referenced to 1 milliwatt. The peaks are various radio stations’ carrier frequencies. It’s positioned at 91.5 MHz, the Baltimore classical station. The marker is barely visible as a “1” towards the left side of the screen. The center frequency is 100 MHz with a span of 20 MHz (that is, the SA is sweeping from 90 to 110 MHz), RBW and VBW (more on these later) of 3 KHz. The following picture shows the Rigol displaying the FM radio band. An SA shows amplitude on the vertical and frequency on the horizontal. Everyone knows that an oscilloscope displays voltage on the vertical axis, and time on the horizontal. One large wheel can adjust pretty much anything. Picture swiped from Rigol’s web site.Īs is apparent from the picture, the front panel is well-laid out with individual buttons for each function, plus soft-buttons used to select sub-modes. For instance, you could feed the TG into a filter and the filter’s output to the SA’s input to display the filter’s frequency response. That’s critical for experiments with RF components.
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The tracking generator output is the SA’s local oscillator as the SA scans from the displayed low frequency to the upper one the TG outputs the frequency being displayed.
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If you can live without the TG (tracking generator) option the DSA815 is $1295.īut I’d never buy an SA without the TG. The 1.5GHz unit is just $1495 that climbs to $9500 for the wide-bandwidth model. They sent me a model DSA815-TG which spans to 1.5 GHz, but other models in the series go to 7.5 GHz. Saelig, their US distributor, loaned me one for evaluation, and the bottom line is that this baby packs a ton of capability into one small and inexpensive package. Rigol has a new low-cost spectrum analyzer (SA).