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Chapter 5, FRONT PANEL OPERATION
Figure 5-28, Configuration Menu 2
The Configuration Menu 2 has two controls, which operate as follows:
LINE FREQUENCY
This control is used to set the center frequency of the line frequency rejection filter,
and so should be set to the local AC power line frequency, i.e. 50 or 60 Hz.
PHASE POLARITY
This control sets the measurement polarity for signal phase measurements. When set
to Positive operation is the same as earlier SIGNAL RECOVERY lock-in amplifiers,
such as the models 7220, 7225, 7265, 7265, 7280, 5209 and 5210. When set to
Negative it is the same as earlier versions of firmware in the models 7270, 7124 and
7230.
Pressing the Previous Menu key returns control to Configuration Menu 1.
5.3.23 Spectral Display
When Main Menu 1 is displayed, pressing the Spectral display key accesses the
Spectral Display menu, a typical example of which is shown in figure 5-29.
5-37
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