Agilent 33120A User's Guide

Chapter 7 TutorialModulationEquations:Compute the modulation pre-scaler divider:S =kF(truncated to integer value ˜ 1)Compute the number of points for the modulation waveform length:P =2 x C(1 + S) x F(rounded down to even number)Waveshapes are automatically expanded or compressed to match length“P” computed above and downloaded into modulation RAM.Example: Assume that you need to phase-continuously frequency hopbetween the following nine frequencies every 200 ms.15.0 MHz, 1.001 MHz, 9.780 MHz, 12.375 MHz, 0.5695 MHz,3.579 MHz, 0.8802 MHz, 0.6441 MHz, and 10.230 MHz.Solution: Create a modulation arbitrary waveform that is preciselysampled in FM modulation.F = 1 / (9 x 200 ms) = 555.555 Hz(modulation frequency)Round down in sixth digit to get modulation frequency to set.S = 624 / 555.555 = 1.1232 (truncate to 1)P =2 x C(1 + S) x F(rounded down to even number)7295