Reference Channel Menu - Ametek 7280 Instruction Manual

Chapter 5, FRONT PANEL OPERATION

5.6.03 Reference Channel Menu

5-80
path and hence controls affecting the signal channel, such as AC Gain and the line
filter controls, apply to both harmonics. Although the full-scale sensitivity setting can
be independently set for both harmonics, the maximum AC Gain that is possible
depends on the greater of these two values.
In standard instruments, the maximum detection frequency for either harmonic
harmonic is 20 kHz; units fitted with the 7280/99 allow operation to 800 kHz and
2
those with th2 7280/98 allow operation to 2.0 MHz
In dual harmonic mode, the reference channel is controlled by the Dual Harmonic
Reference menu, which differs from the Reference Channel menu used in the other
three modes. In addition, controls are needed for the corresponding output channels,
and so the Output Filters and Output Offset and Expand sub-menus also change. The
relationship of all these menus to Main Menu 1 is shown in figure 5-49. Note that as
with the main menu structure, shown in figure 5-1, it is possible to return to the Main
Display from any menu by pressing the Previous Menu key, but this has been omitted
from figure 5-49 for the sake of clarity.
Figure 5-49, Dual Harmonic Mode Menu Structure
In dual harmonic mode, pressing a key adjacent to the Reference Channel item on
Main Menu 1 accesses the Dual Harmonic Reference menu, shown in figure 5-50.
or
1