Instruction manual

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5 Analysis 46
Exercise To see Threshold and Tolerance in use, record some pulse data using the Tutorial setting
from one of the Settings groups. Apply the Rate function to the pulse channel.
The Rate function must be able to ignore the second small wave associated with each larger
pulse wave; otherwise, it will report a rate that is twice what it should be. Using the Rate
function on an ECG would mean that Threshold and Tolerance should be set so that only one
wave of the three separate and distinct waves per beat can be counted.
Activating Periodic
Transforms
All Periodic functions are selected in the same manner. To apply any of
these functions to a channel, click on the Add Function button in the
Channel bar. Select Periodic from the Function menu and a submenu
appears. Select one of the functions in the submenu. Click Start in the Main
window to begin recording. AutoScale the raw data, then AutoScale the
calculated channel. No other setup is required.
The functions in the Periodic submenu are:
Rate: The program takes the period in seconds and divides this value into
60. The result is a rate, which is expressed in beats per minute
Frequency: The program takes the period in seconds and divides this value
into 1. The result is a frequency, which is expressed in Hz or cycles per
second.
Period: The program takes the Period for each cycle.
Cyclic Min: The program examines all of the points in the current period and finds the lowest
value.
Cyclic Max: The program examines all of the points in the current period and finds the highest
value.
Cyclic Mean: The program examines all of the points in the current period and finds the
average of all values.
Max dV/dt: The program examines all of the derivatives in the current period and finds the
highest value.
Mean dV/dt: The program examines all of the derivatives in the current period and finds the
average of all values.
Min dV/dt: The program examines all of the derivatives in the current period and finds the
lowest value.
RMS: The program examines all of the points in the current period and finds the Root Mean
Square value for all points.
Integral The integral is the area under the curve. The Integral function, as executed by the DataTrax2
software, calculates a continuous sum of all the data points on a given channel that satisfy a
certain citeria, and plots the running total. There are four types of Integrals:
Standard: Includes all data points in the calculation
Absolute: The Absolute Value of the Integral (Abs. Integral), as the name implies, makes all
values of the integral positive and plots the running total. The Abs. Integral is used for analysis
of cyclic data such as unit action potentials or EMG data.
Positive: Only the positive data points are included in the calculation.