Keysight M8000 Series of BER Test Solutions User Guide 299
Setting up Generator 5
Please note that both the upper and lower frequency and the
frequency adjustment of all three frequencies are not reflected in the
firmware. The GUI just calculates the resulting bit rate and writes it to
the firmware.
The Deviation of the clock rate. The ranges of SSC deviation are as
follows:
• Down Spread with deviation of 0 … 1 PPM
• Up Spread with deviation of 0 … 1 PPM
• Center Spread with deviation of 0 … 1 PPM
• Asymmetric allows to independently specify up and down deviation.
When this is selected, the deviation is no longer specified in terms of
peak-peak deviation, but independently for up and down deviation.
The value ranges for the up deviation are 0 PPM to 1 PPM and for
down deviation are -1 PPM to 0 PPM. The Asymmetric deviation
type is only available in M8041A and M8046A modules.
• Frequency: The deviation Frequency. The SCC provides the frequency
range of 100 Hz – 200 kHz.
• Type: You can click the drop-down list to choose among Down Spread,
Up Spread, Center Spread and Asymmetric deviation type.
• Profile: Controls the profile of the spread spectrum clocking. You can
use the drop-down list to choose between the Triangular and Arbitrary
profile.
• Shape: For Arbitrary profile, you need to specify the Arbitary Waveform
file. It is a simple text file that contains the data points which define the
arbitrary waveform of the SSC profile.
The deviation in Upspread and Downspread is the p-p value while in
Centerspread it is 1/2 p-p.
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