Minimum Frequency
can be set to an integer value between 1 kHz and the Maximum Frequency. If
this value is adjusted above the Current Frequency, the Current Frequency is adjusted to comply
with the Minimum Frequency.
Power.
If the power dissipated in the actuator is greater than this value, the actuator power
reading in the status panel changes to bold red text to alert the user.
Start/Stop button.
Enables/disables the signal generator.
The above settings can be adjusted whether the amplifier is stopped or started. The user can also switch
between Test Signal and Resonance Tracking when the amplifier is stopped or started.
Figure 3. Manually controlled frequency and amplitude
3.4
Resonance Tracking Mode (Phase Tracking)
Resonance tracking is achieved by setting the Frequency Control to “Phase Tracking”. In this mode the
amplifier adjusts the frequency of the drive voltage to maintain a constant phase between the drive
voltage and current. All of the controls described above are available in resonance tracking mode, with the
addition of:
Frequency Step
controls the rate of change in the frequency adjustment. The next frequency is
calculated by
𝑓
𝑘+1
= 𝑓
𝑘
+ Freq. Step × (Target Phase − Current Phase)
High values of Frequency Step cause the drive frequency to adjust more quickly but may be less
stable. The Frequency Step can be set between 0.01 and 10.0.
