Also use the Sweep Steps button to enter the number of frequency steps, use 100 as the number. Use the Start Frequency entry to set the frequency sweep to start at 100 Hz and use the Stop Frequency entry to the sweep to stop at 20000 Hz. Be sure the Sync AWG check box is selected. Set AWG A mode to SVMI and Shape to Sine. This will be a 1 Vrms (0 dBV) amplitude centered on the 2.5V middle of the analog input range. Set AWG channel A Min value to 1.086 and Max value to 3.914. Under the Options drop down menu click on Cut-DC to select it.
Under the Curves menus select CA-dBV, CB-dBV and Phase B-A. With the circuit connected to the ALM1000 as in figure 1, start the ALICE desktop software.
Using the low pass RC circuit in figure 1, with R 1=100 Ω and C 1=1.0 uF, we can sweep the input frequency from 10 Hz to 5000 Hz and plot the signal amplitude of both channel A and B and the relative phase angle between channel B and A. The ALICE desk-top Bode Plotting software can make generating frequency and phase response plots much easier. This gives the cut-off (roll-off) frequency for the constructed Low Pass RC filter. Compute the 70 % of Vp-p and obtain the frequency at which this happens on the Oscilloscope. Increase the frequency of channel A in small increments until the peak-peak voltage of channel B is roughly 0.7 times the peak to peak voltage for channel A. Start with a low frequency, 50 Hz, and measure output voltage CB- V peak to peak from the scope screen. Also from the Meas CA menu select A-B Phase.Ĥ. From the Meas CA drop down menu select P-P under CA- V and do the same for CB. Adjust the time base until you have at approximately two cycles of the sine wave on the display grid. From the Trigger drop down menu select CA- V and Auto Level. From the ALICE Curves drop down Menu select CA- V, and CB- V for display. From the AWG B Mode drop down menu select the Hi-Z mode.ģ. From the AWG A Shape drop down menus select Sine. From the AWG A Mode drop down menu select the SVMI mode. Set the channel A AWG Min value to 0.5 and Max value to 4.5V to apply a 4Vp-p sine wave centered on 2.5 V as the input voltage to the circuit. Set up the RC circuit as shown in figure 1 on your solderless breadboard, with the component values R 1 = 1 KΩ, C 1 = 1 ♟.Ģ.
Figure 4: Low Pass RC filter breadboard connections.ġ.
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