Measurement-computing eZ-Balance rev.9.0 Uživatelský manuál stáhnout pdf (Strana 25)

eZ-Balance 969391 Windows, Buttons, and Menus 3-7

Configuration Menu . . . Analyzer Tab

Panel

Function(s)

Hardware

This panel consists of a pull-down list from which you must select your data

acquisition hardware, for example, 600 Series, ZonicBook/618E, or a

WaveBook/516 series device with a WBK14 or WBK18.

Low Frequency

Cutoff Hz

This panel allows you to set values for: No, Single, and Double Integration. Low

frequency cutoff is used to remove the low frequency effects of integration. All

spectral amplitude values below the specified frequency value are set to zero.

Filter

Used to set the High Pass (AC Coupling Filter) to 0.1 Hz or to 1.0 Hz. Note that

coupling is set to AC or DC in the Input Channels tab. Select 1.0 Hz for machines

with RPM > 300.

Analyzer Setup

This panel is located on the right-side of the Balance Configuration tab.

It includes pull-down lists for the following items:

Spectral

Lines

The number of lines per spectrum and the number of data samples used in the FFT

(Fast Fourier Transform) process. The more spectral lines, the greater the data

resolution. As the number of spectral lines increases, so does the time that it takes

to collect the data and the amount of disk space.

Analysis

Frequency

(Hz)

This value is the maximum frequency of interest. The sampling rate will be 2.56

times the analysis frequency. Verify the maximum frequency response of your

probes. Typically, the analysis frequency will be 5x the Machine’s Rotating

Speed.

Number of

Averages

The averaging function is a rolling buffer that averages the last “n” data blocks.

The typical number of averages is 5.

FFT

Window

Options are None, Hanning, Flat Top, or Blackman Harris. Hanning provides

better frequency resolution. Flat Top provides better amplitude resolution.

No. Balance

Planes

eZ-Balance can have between 1 and 7 balance planes, up to the number of response

inputs.

The lower right section of the Analyzer Setup tab includes a note which states:

Valid RPM Range

Acquisition Time (for 1 block)

Acquisition Time (weighted average)

Frequency Resolution

1 2 ... 20 21 22 23 24 25 26 27 28 29 30 ... 39 40

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Measurement-computing eZ-Balance rev.9.0 Uživatelský manuál Strana 25

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