6.6.5 Delete a saved tachometer setup in Analyze
1. From the Analyze main menu, press F1 Manual Analyze > F7 Tach Setup.
2.
From the Tachometer Setup screen, press F6 Save / Recall Setup.
3. Use the up and down arrow keys to select a saved setup.
4. Press F5 Delete Setup.
5. Press Enter.
6.7 Common data collection parameters
This section describes parameters that are available in most of the Analysis Experts and
Manual Analyze. To view these options, open Manual Analyze for a measurement.
6.7.1 Fmax and Fmin
The Fmax and Fmin values set the maximum and minimum frequency limits for your
measurements. Equipment with high operating speeds requires a higher Fmax to capture
all crucial information. The Fmin (low cutoff) removes very low frequency integration noise
from the overall measurement and is normally set at 2 Hz. You can set Fmin to 0, but the
minimum value is the second line in the spectrum, where the Fmin value is equal to 2x line
resolution.
Measurement Recommended setting
Fingered elements such as gear teeth, fan
blades, pump vanes, and bearing elements
(3 x the number of fingers) x the operating
speed
Non-fingered elements 10 x the operating speed
Coast up, coast down recordings 200 to 400 Hz (12,000-24,000 cpm)
6.7.2 Lines of resolution
The resolution of the spectrum increases with the number of spectral lines. The more
spectral lines, the more information the spectrum contains. Increasing the number of lines
also increases the required memory and time to measure the spectrum.
The spectrum consists of discrete spectral lines that display at fixed frequency intervals.
The height of each spectral line represents the vibration amplitude at a frequency.
Use high-resolution measurements to distinguish between two closely-spaced vibration
frequencies or when the Fmax is very large. The maximum for single-channel
measurements is 12,800 lines. The maximum for two and four channel measurements is
6,400 lines.
Analyze and Advanced Analyze
118 MHM-97432 Rev 7
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