Instrumentation & Measurement Magazine 23-2 - 100

Fig. 4. The schematic of the system.

sinewave into the system. We had the computer running MATLAB store the values output by the adders when this constant
signal was input. Because the sample-and-hold and adder circuits are linear, we knew that the stored values would always
be the offset's "piece" of the output.
In the next phase, the user was told to enter his/her signal plus the offset. By subtracting the stored values of the
output of the adders to the offset from the measured output,
100	

we effectively removed the influence of the offset. In this way
we were able to enter our three frequencies (one at a time, of
course), and we were able to input a constant voltage by inputting the fixed offset plus the constant voltage. This system has
worked well for us. Over the course of well over a thousand
(fairly simple) measurements, we were able to correctly determine the frequency of the input from the compressed signal
more than 99% of the time.

IEEE Instrumentation & Measurement Magazine	

April 2020



Instrumentation & Measurement Magazine 23-2

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