ACES SYSTEMS Cobra II, Руководство пользователя

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Gen II
User Manual
15-7 – Overall Vibration Survey Chapter 15 Revision 4.10, Apr 20
This allows you to view amplitude, in the selected engineering units, relative to the speed of the
machine or component being monitored.
If you choose this option to define speed inputs for the survey, the following “Speed Inputs
Setup” banner screen is displayed. There are four rows, 1, 2, 3, and 4 indicating the tachometer
input channel. There are four columns, Measure, DESC, OFF/100%, and Factor. These inputs
are described below.
To define the Speed Inputs Setup, do the following:
15.1.1.3.1. In the “ Measure ” column, use the [

] or [

] key to select from “Pulse S”, “Pulse D” or
“None” indicating the tachometer input type for the tachometer input channel indicated.
NONE is selected when the corresponding tach channel is not being used. Pulse is used
when there is a pulse input such as a Phototach, Lasetach or magnetic pickup. This pulse
input may be, but is not necessarily a once-per-rev pulse. The preference is actually a
multi-pulse per revolution input. The D or S in the selection depicts either single-ended
(S) or differential (D) as required.
15.1.1.3.2. The “ DESC ” column is the descriptive name for the tachometer input such as “N1”,
“N2”, or “Fan”. Enter up to five alphanumeric characters in this field. The description
should be one that all users of this setup are familiar with and easily understood.
15.1.1.3.3. The “ 100% Spd ” column is used to enter the rpm at 100% of component speed. Use the
keypad to enter the value in the “100% Spd” field. The example above shows “4800” and
“10000” for “N1” and “N2” respectively. This will allow the analyzer to also display the
component speed in percent during data acquisition. Therefore, when used on an engine
spool, N1 or N2 for example, the analyzer’s indication will match the cockpit indicator.