Dual Harmonic Main Display - Ametek 7280 Instruction Manual

Chapter 5, FRONT PANEL OPERATION

5.6.02 Dual Harmonic Main Display

5-76
Once dual harmonic has been activated, the Main Display - Dual Harmonic Mode is
displayed, as shown in figure 5-48.
Figure 5-48, Main Display - Dual Harmonic Mode
In dual harmonic mode, controls and displays relating to the first detection harmonic
carry the suffix "1" and those for the second, the suffix "2". Hence, for example, if a
reference frequency of 1 kHz is applied, Harmonic 1 is set to 3 and Harmonic 2 to 5,
the instrument will measure signals at both 3 kHz and 5 kHz. The Sensitivity 1, Time
Constant 1 and Harmonic 1 Phase controls will affect the signal being measured at
3 kHz, while the Sensitivity 2, Time Constant 2 and Harmonic 2 Phase controls will
affect the signal being measured at 5 kHz.
The range of controls that can be placed on the left-hand side of the Main Display
using the Select Control key is therefore extended to include those relating to both
harmonics of the reference, as follows:-
Figure 5-47, Dual Harmonic Setup Menu