Gen II
User Manual
16-2 – Monitor Spectrum
Chapter 16
Revision 2.10, Apr 2020
Viper II
Cobra II
16.1.1.2.
Determine if the required frequency units are revolutions per minute (RPM) or cycles per
second (Hz). Press the [
] key to toggle between the frequency unit selections in the
field.
16.1.1.3.
Use the [
] key to move to the minimum frequency field, immediately to the right of the
frequency units’ field. Use the analyzer keypad to enter the minimum frequency of
interest for this survey relative to the frequency units selected in paragraph 16.1.1.2. If
you desire a high pass frequency, such as 40 Hz, the minimum frequency field should
reflect this as the minimum frequency of interest. Use the keypad to enter the minimum
frequency into the first field.
16.1.1.4.
Determine the maximum frequency requirements. For instance, if the frequency of
interest is 300 Hz, you might choose a minimum and maximum frequency that will place
the 300 Hz in the center of the range. The minimum might then be 250 Hz and the
maximum 350 Hz for instance. You might also consider other factors such as Harmonics.
If you want multiples of the fundamental frequency included in the frequency range,
determine to what extent that need is (1X, 2X, 3X and so on) then extend the frequency
range to include it. For example, 300Hz is the frequency of interest, the fundamental
frequency. If you want 3X harmonics included in the frequency range you must multiply
the fundamental frequency (300 Hz) X the harmonic range (3X) and arrive at an upper
range of 900 Hz. Use the keypad to enter the maximum frequency into the second field.
16.1.1.5.
Use the [
] key to move down to the next field. Set the Resolution as required at 100,
200, 400, 800, 1600, or 3200 lines by pressing the [
] key to scroll through the
selections until the desired resolution is displayed. Unless you are attempting to separate
two frequencies that are within close proximity to one another, 100 or 200 lines should
suffice for general analysis. Higher resolutions will provide a much sharper image of the
specified frequency band but also require more time and memory for acquisition.
16.1.1.6.
The RPM/Line (Hz/Line) field is an informational entry. The frequency unit displayed is
determined by the entry in paragraph 16.1.1.2. It will tell you the approximate interval
between one line of resolution and the next. This is based on the minimum and maximum
