ACES SYSTEMS Cobra II, Руководство пользователя

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Gen II
User Manual
14-9 – Vibration Spectrum Survey Chapter 14 Revision 4.10, Apr 2020
give us a factor of “2.5”. If the tach pulse frequency is unknown, set the FACTOR to “1”
and read the value for the applicable tach channel at a known stable engine speed. The
indicated tach pulse frequency can then be divided into the known engine speed at that
point. For this purpose, it is recommended to use the analyzer’s “Monitor Overall”
function (see Chapter 19) as it is quick and easy to configure.
14.1.1.3.5. Use the [

] key to select the “ Tach Filter Type ”. The options are for a Single pole
filter, a Double pole filter or None.
14.1.1.3.6. Use the keypad to enter the “ Tach Filter Frequency ”. Enter a numeric value equal to
the lowest frequency of interest. The filter will then be effective for that frequency and
all frequencies above that value.
14.1.1.3.7. Repeat paragraphs 14.1.1.3.1 through 14.1.1.3.46 for each of the channels required.
When all fields are completed per your requirements, press the [OK] key to return to the
Vibration Spectrum Setup screen.
14.1.1.4. – Limits
Press the [F3] “Limits” key from the Vibration Spectrum Setup screen shown above in paragraph
14.1.1. The Limits option allows you to enter the limits relative to the speed, or frequency (X
coordinate of the spectra) which will place a limit line directly on the spectral plot for quick
reference of compliance with operating limits of the machine or component being monitored. To
complete the Limits option, do the following:
Viper II Cobra II
NOTE
Sensor Channels C & D are only available on the Viper II
14.1.1.4.1. Choose the spectrum for which you wish to define limits, “A-Limits”, “B-Limits”, “C-
Limits”, or “D-Limits” from the corresponding function key at the bottom of the screen.
The letters A, B, C, and D are in reference to the input channel of the analyzer.