Gen II
User Manual
19-5 – Monitor Overall
Chapter 19
Revision 2.10, Apr 2020
19.1.2.5.
The “
FACTOR
” column can be used to enter a multiplier for converting Hertz to actual
component speed in RPM. If using a Pulse input, the RPM is equal to Hertz x Factor. The
analyzer assumes the input to be relative to Hz (cycles per second) so that an input of one
pulse per revolution (one-per-rev) would require a FACTOR of 60 (1 per-rev X 60 Hz
assumed) to equal Revolutions Per Minute (RPM). Enter the factor using the keypad. The
example above shows a factor of “60” for the “N1” to represent the usage of a
“LaseTach”. When sampling multiple pulses per revolution, you must know the tach
pulse frequency (Hz) of the tach source at 100%. The component speed (RPM) at 100%
is then divided by the tach pulse frequency to obtain the factor. In the example above, the
“N2” speed at 100% is 10,000 RPM and the tach pulse frequency is 4000 Hz. This will
give you 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.
19.1.2.6.
Use the [
] key to select the “
Tach Filter Type
”. The options are for a Single pole
filter, a Double pole filter or None.
19.1.2.7.
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.
19.1.2.8.
Repeat the steps from paragraph 19.1.2.2 through 19.1.2.57 for each of the four channels
you intend to use for this job the/or press [OK] to accept your settings and exit back to
the Overall Vibration Setup screen.
19.1.3.
– Monitor Overall
The analyzer will begin data acquisition as soon as the screen is displayed. For a description of
the fields and function keys, see paragraphs 19.1.3.1 and 19.1.3.2 below. You will also see three
function boxes at the bottom of the screen (see following figure) corresponding to the position of
the [F1], [F4], [F3], and [F5] keys directly below them. The boxes read “Maximum,” “Pause,”
“Spectra,” and “Restart.”
