Chapter 2 107
Making Measurements
Example 8: External Millimeter Mixers (Unpreselected)
WARNING The open-circuit bias voltage can be as great as +3.5 V through
a source resistance of 300 ohms. Such voltage levels may appear
when recalling an instrument state in which an active bias has
been stored.
NOTE The bias value that appears on the spectrum analyzer display is
expressed in terms of short-circuit current (that is, the amount of
current that would flow if the IF line were shorted to ground). The
actual amount of current flowing into the mixer will be less.
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