Soft dB SPM PLL User Guide - Manual (Page 16)

SPM - PLL User’s Manual 16
Signal Description
Resonator Output Resonator output time signal in V. This is the
signal measured by the DSP board on input #1.
Excitation Excitation time signal in V. This is the signal
generated by the DSP board on output #1.
Resonator Phase (raw) Resonator phase in degrees, as measured by
the phase detector. The phase detector
algorithm measures the phase of the resonator
alone, automatically correcting for the phase of
board’s digital and analog chains. This is the
raw signal and no low pass filter is applied.
Excitation Freq. (raw) This value (in Hz) is fixed if the phase controller
is OFF. If the phase controller is engaged, this
signal is the output of the phase corrector. This
is the raw signal and no low pass filter is used.
Resonator Output Amp. (raw) Resonator output signal amplitude, as
measured by the phase detector (in V). This is
the raw signal and no low pass filter is applied.
Excitation Amp. (raw) Excitation amplitude in V. This signal is
constant at the specified value if the amplitude
controller is OFF. If the amplitude controller is
engaged, this signal is the output of the
amplitude corrector. This is the raw signal and
no low pass filter is applied.
Excitation Freq. (filtered) Filtered excitation frequency (in Hz). This signal
is constant at the specified value if the phase
controller is OFF. If the phase controller is
engaged, this signal is the filtered output of the
loop controller. The display low pass filter is
applied to lower the noise. For this signal the
Signal control can be used to present the
absolute value or the shift value. The reference
value in the Operation Set-up tab is used to
compute the shift value.
Resonator Phase (filtered) Filtered resonator phase (in degrees), as
measured by the phase detector. The phase
detector algorithm measures the phase of the
resonator alone, automatically correcting for the