258 Keysight M8000 Series of BER Test Solutions User Guide
5 Setting up Generator
Why Incorrect Terminations Could Damage Your Device
Choosing wrong terminations may cause your device to output voltage
levels that are not as expected. It may also cause excessive current or
current flow in the wrong direction, which can damage your device.
Note that an internal protection circuit becomes active if the termination
voltage is wrongly adjusted. The protection circuit sets the output voltages
to safe levels, typically:
Vhi = Vlo = Vterm = externally measured termination voltage.
If you adjust the termination voltage, and try to enter value(s) which are
outside of the currently allowed window, the Auto Correction
Confirmation message box will pop up with respective apply and discard
options as shown in the following figure:
AC Coupling and Bias Tees
The generator's outputs are always internally DC-coupled; even when AC
termination is selected. For this reason, caution must be taken when
connecting your instrument to a device or test setup.
The diagram below shows a device that is AC coupled. Note that the
capacitor is part of the test setup.
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