256 Keysight M8000 Series of BER Test Solutions User Guide
5 Setting up Generator
• High voltage is the upper voltage level of the signal.
• Low voltage is the lower voltage level of the signal.
• Offset voltage is the offset of the average voltage level from 0 V.
• Amplitude of the signal.
When adjusting the output levels, it is important to understand the
concept of how the M8020A/M8030A handles voltages.
Changing the Amplitude
Typically, during tests, when you adjust the amplitude, you want to keep
the offset constant. This keeps the ideal sampling point within the eye. The
M8020A/M8030A handles this by keeping offset voltage constant when
amplitude is changed.
Changing the Output Levels
On the other hand, you may want to adjust the output voltage level
without changing the amplitude. The M8020A/M8030A handles this by
keeping amplitude constant when offset voltage is changed and high/low
voltage are accordingly adjusted.
Voltage Level Restrictions
The M8020A/M8030A cannot generate a signal that has voltage levels out
of range. If you try to enter a value for one parameter that would put
another parameter out of limits, the M8020A/M8030A rejects the change.
This could happen, for example, if low voltage is already at the minimum,
and you try to lower either of high voltage or low voltage, or increase
amplitude.
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