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I. Introduction

An oxygen sensor was analyzed in order to measure the pulse on human body. The Ch1, Ch2 and Wav1 tools on the Analog Discovery were used in this module to analyze Oscilloscope, wavegen and Network Analyzer to generate Bode plot to analyze filter.

II. Procedure and Results

1. Procedure 1 : The Op-Amp

Figure_1_OpAmp_1

Figure 1: LMC6484 Op-Amp Configuration.

Procedure 2

Table 1 : Table 1: Expected and Measured Voltage for Voltage Divider Circuit without an Op-Amp Buffer.
Expected Voltage at Ch1+
Measured Voltage at Ch1+
1MΩ Voltage Divider
2.5 V
1.722972155 V
499KΩ Voltage Divider
2.5 V
2.549085517 V

Table 2 : Expected and Measured Voltage for Voltage Divider Circuit with an Op-Amp Buffer.

Expected Voltage at Ch1+

Measured Voltage at Ch1+

1 MΩ Voltage Divider

2.5 V

2.757737038 V

499KΩ Voltage Divider

2.5 V

2.52256059 V

Procedure 3

Figure : the relationship between the output and input is a straight line with a negative slope of 10.

Procedure 3

Figure : low pass filter with cut-off frequency value

Procedure 4

Figure : Inverting Amplifier Circuit waveform with 10 mV amplitude, 1 Hz frequency and 2.5 V offset

Figure : Inverting Amplifier Circuit waveform with 10 mV amplitude, 10 kHz frequency and 2.5 V offset

Procedure 5

Figure : pulse reading in term of voltage vs time.