Soft dB SPM PLL User Guide - Manual (Page 11)

SPM - PLL User’s Manual 11
4.3 Operation Set-up Controls
PLL interface: Operation Set-up Controls
These controls allow the set-up of the reference values and the configuration of the analog output
signals. Up to four analog signals can be generated by the PLL. For each signal, the reference, the
range and the output number can be adjusted. A low pass filter is applied on the output signals and the
frequency cut-off can be adjusted from a menu. There are two LP filters: one for the phase and
excitation frequency signals and another one for the resonator and excitation amplitude signals. For
each output signal, the reference can be automatically set to the current value with the button Set
reference. The minimum and maximum values in unit are presented for each output. The minimum and
the maximum depend on the selected range and the reference value. The sensitivity of the output is
also displayed and can be modified by adjusting the range.
4.4 Excitation Parameters
Output #1 of the PLL generates a high-purity sine wave. The frequency and the amplitude can be
adjusted with these controls. If the phase controller is engaged, the frequency is not adjustable and the
Excitation Freq. (Hz) control becomes an indicator. If the amplitude controller is engaged, the excitation
amplitude is not adjustable and the Excitation Amp. (V) control becomes an indicator.