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What is the Damping Factor, on the Acquisition
Panel, when selecting Force/Impact window?
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| Answer: The dialog setup parameter is used to select the number of times that a standardized (meaning an approximated exponential) decay window is applied to the response data channels. The resultant FRF's will experience an increase in damping which can be approximated by: |
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| z = ( 0.0002 * n )/(w * dT) |
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where:
z = change in damping
n = window intensity (parameter count)
w = frequency (radians)
dT= sampling increment |
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• What startup parameters during a Sine Analysis
run are of most interest?
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Answer: The "startup parameters" of most interest during a Sine analysis run are the starting threshold and frequency. They are determined as follows:
• The threshold is set to 1.414 x Maximum allowable noise level as defined in the safety limits dialog. This basically means that a valid signal must be greater than 3 dB above the maximum allowable noise floor.
• The frequency is set as a window of +\- 10% of the defined test profile start frequency.
• Once the measured reference channel frequency and threshold meets these limits, the "test" is assumed to begin. |
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•
What do the different status panel colors
indicate?
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| Answer: A simplified voltage "tracking" system is provided by observing the channel status view panel. The colors of the various channel values will change based on the current channel voltage level being processed. |
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| The following table allows the user to identify the channel voltage observed relative to the full scale (FS) channel range: |
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| Color |
Meaning |
| Grey |
Channel is inactive or not available. |
| Yellow |
Channel voltage is less than 10% of the FS value. |
| Green |
Channel voltage is less than 99% of the FS value. |
| Red |
Channel voltage is greater than or equal to 99% of the FS value. |
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