Measurement Computing eZ-PostView rev.2.0 User Manual

Page 128

5-10 Interactive Plot Display

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eZ-Analyst

Function

Description / Comments

Differential

Differential (also referred to as Differentiation) is for display purpose only

and does not modify the data. Differentiation is only active when frequency

domain data is displayed. Select single or double differentiation or none by

continuous clicks of the button (#28). In the plot display’s “Y-Axis” label, a
“&” indicates single differentiation, “&&” indicates double differentiation, and

no ampersand indicates no differentiation. Note that both Differentiation

and Integration are calculated by dividing each element of the function by
(jw)^n, where j is the square root of -1; w is the product of 2 pi times the

frequency of the block element; and n is an integer from +2 to -2.

If the signal is displacement, then single differentiation (&) results in
velocity, and double differentiation (&&) results in acceleration.

Integral

Integral (also referred to as Integration) is for display purpose only and

does not modify the data. Integration is only active when frequency domain
data is displayed. Select single or double integration or none by continuous

clicks of the button (#29). In the plot display’s “Y-Axis” label, a “~”

indicates single integration, “~~” indicates double integration, and no
ampersand indicates no integration. Note that both Differentiation and

Integration are calculated by dividing each element of the function by

(jw)^n, where j is the square root of -1; w is the product of 2 pi times the
frequency of the block element; and n is an integer from +2 to -2. If the

signal is acceleration, then single integration (~) results in velocity, and

double integration (~~) results in displacement.

Note: Engineering Units change when the instrument type is Acceleration

and integration is implemented.

Scale - RMS, Pk,
Pk-Pk

The Scale button allows the user to cycle through the following scales:
RMS: (Root Mean Square): The square root of the average of the square of

the value of the function taken throughout one period. Peak: Zero to

Peak. Pk-Pk: Peak to Peak. Refer to the following illustrations.

RMS

Peak

Peak-to-Peak

RMS Level