Performance of Electrocardiogram

Performance of electrocardiogram 1
Performance of electrocardiogram.
Name
Institution
Date

Performance of electrocardiogram 2
Introduction
Electrocardiogram is defined as the activity that involves the use of electrodes placed on
the human skin to record the heart’s electrical activities over a given time period (Rodriguez,
2017). It is so far the commonly practiced form of measuring the physiological potential in
humans. In this practical the electrocardiogram instrument to be used is an oscilloscope. An
oscilloscope is an electronic test instrument that instantly displays and analyses electronic
waveforms by drawing a two dimensional graph of the signal voltage against time (Johnson,
Brush, & McTigue, 2016). The oscilloscope in this practical will be used together with a signal
generator in measuring some crucial electrocardiogram recorder parameters. A wave form simulator
will also be used to obtain test traces that will be recorded and analyzed.
Methods
Apparatus
 ECG recorder
 Oscilloscopes
 Signal generator
 Potential divider
 Crocodile clip lead
 ECG waveform simulator
Method Procedure
i. The output of the generator was set to 10Hz sine wave while the sensitivity of the recorder
set to 1cm/Mv
ii. The input voltage of the signal generator was adjusted to give a deflection of 30 to 35 units
for every change in frequency of input signals.
iii. The apparatus were arranged as shown in figure 1 below
iv. All the lead-1 position which uses yellow and red terminus were measured

Performance of electrocardiogram 3
v. The black terminus was connected to the earth of the signal generator side
vi. Peak-to-peak pen deflection of the recorder for peak-to-peak voltage of the signal generator
was recorded for the first 10 points
vii. Peak-to-peak pen deflection of the recorder for varying frequencies from 1 to 100 for a
constant input voltage was recorded.
viii. The results were used in plotting a graph.
Circuit diagram
Figure 1
Discussion on the arrangement of the resistors across the potential divider
The output voltage required guides on the arrangement of the resistors across the
potential divider. From the resistor values given on the potential divider and the required value
of output voltage for a given input voltage, equation Vout = Vin R2/(R1+R2) is used to locate the
resistors to give the required output voltage.