Set Up The Job - Emerson CSI 2140 User Manual

5.
6.
8.6

Set up the job

8.6.1 Set the measurement parameters
1.
2.
3.
4.
Option Description
Display the spectrum from the response input.
Spectrum - Response
Describe the degree of linear relationship between the reference
Coherence
and response inputs. A coherence value close to one (1.0) at a
frequency indicates the response and reference are linearly
related, and the measurement signal to noise ratio is high.
Display the phase relationship of the response and reference
Cross Channel Phase
signals.
(Resp/Ref)
Display a spectrum representing the transfer function of the
FRF (Ref/Resp)
reference input/the response input. It is the amount of force that
is required to provide a response at a given frequency.
Display a spectrum representing the transfer function of the
FRF (Resp/Ref)
response input/the reference input. It is the measured ratio of
response of the structure acceleration to a known excitation.
Press F6 Plot Format or F12 Plot Format to set the display for multiple plots.
Press Enter.
From the ODS/Modal main menu, press F8 Job Manager.
Use the up and down arrow keys to select a job.
Press F4 Edit This Job > F4 Set Meas Params.
Set the following options as necessary.
Option Description
F2 Set Number of Enter the number of points. The number of measurement point
Points directions and number of points determine the total number of locations
to collect data. For example, if the measurement direction is XYZ and
1,024 points are defined, a total of 3,072 locations (1,024 X, 1,024 Y and
1,024 Z) are available in the job. The default is 20.
F3 Set Starting Enter the first measurement point to display when you collect data. If a
job has 20 measurement points, the starting point could be from 1
Point
through 9,979. If the starting point is 9,979, the second point number
would be 9,980. The default is 1.
ODS/Modal
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