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MEASURIMENT SYSTEM e©NFi@yRATi©N
DETEOTION
You do not have to set AC detection on the analyzer unless DC mode was used In the previous
measurement (even If the HP 8757A is turned off, it remembers the measurement mode). If the last
measurement was in DC mode, press [SYSTEM] and select [MODE AC/DCj to turn AC mode on (AC lights
up). You can also press [PRESET] to set the AC detection mode; AC detection is automatically set when
the analyzer presets.
For the majority of measurements, AC detection is the preferred method. It offers greater sensitivity and
immunity to noise and drift with time and temperature. AC detection amplitude measurements require
a modulated test signal. Modulation is provided via an internally modulated source (e.g. the HP 8350B),
or from the HP 8757A rear panel modulator drive. Test set connections depend on the source; Figure 2-2
illustrates a typical measurement.
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