Instrument Configuration 3
U8903A User’s Guide 55
The Ranging circuit conditions the signal to as close to the
full scale of the analog- to- digital converter (ADC) as
possible, optimizing the measurement dynamic range. The
24- bit ADC then converts the analog signal to its digital
form and sends it to the digital signal processor (DSP).
Inside the DSP, the digital signal may optionally pass
through a combination of up to three digital filters, one each
from the low pass, high pass, and weighting filter groups
before sending it to the measurement section.
Signal generation
The DSP generates all the required waveforms, except for
square wave, digitally. The digital waveform data is streamed
realtime into the 24- bit digital- to- analog converter (DAC)
where it is converted to voltage and sent to the output
conditioning block to be amplified or attenuated to the
required amplitude. Finally, the waveform is routed through
either the Balanced (XLR) or Unbalanced (BNC) output
signal connectors to the unit- under- test (UUT).
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