I'm doing a coupled pendula experiment where we are measuring the oscillation of the two pendulums and changing the height of the spring (l) as seen in the figure below.

\fLive voltage read out will freeze while recording data. Channel can not be changed during reading. Voltage 0 plotted in black, voltage 1 plotted in red. 0.05 Current save directory: C:/Users/z5416320/Desktop Select directory Voltage 0: 0.00- -0.01 V Channel: 0-1 - Voltage 1: 0.00 V Channel: 2-3 - Voltage (V) -0.05 Preset read duration: 1.0 minutes Start 0 10 20 30 40 50 60 Time (s) Time: 60.05 Data: 14080 Save data 0.03 0.02 Amplitude 0.01 0.00 0 N 8 10 Frequency (Hz)Live voltage read out will freeze while recording data. Channel can not be changed during reading. Voltage 0 plotted in black, voltage 1 plotted in red. Current save directory: C:/Users/z5416320/Desktop Select directory 0.05 Voltage 0: Voltage 1: 0.00 Channel: 0.00 V Channel: 2-3 - Voltage (V) 0.00 V 0-1 - -0.05 Preset read duration: 1.0 minutes -0.10 Start 0 10 20 30 40 50 60 Time (s) Time: 60.01 Data: 14080 Save data 0.06 0.04 Amplitude 0.02 0.00 0 N 6 10 Frequency (Hz)Live voltage read out will freeze while recording data. Channel can not be changed during reading. Voltage 0 plotted in black, voltage 1 plotted in red. 0.10 Current save directory: C:/Users/z5416320/Desktop Select directory 0.05 Voltage 0: 0.00 - Voltage (V) 0.00 V Channel: 0-1 - Voltage 1: 0.00 V Channel: 2-3 - -0.05 - Preset read duration: 1.0 minutes -0.10 Start 0 10 20 30 40 50 60 Time (s) Time: 60.04 Data: 14080 Save data 0.08 0.06 Amplitude 0.04 - 0.02 0.00 0 N 6 10 Frequency (Hz)