Commtest Instruments vb Series User Manual

Section 4: Manual Setup Measurement Parameters
68
Setting the Fmax
The Fmax is the maximum frequency displayed on the spectrum i.e.
the frequency range, starting from zero, over which vibration
amplitudes are displayed. The unit Hz is equivalent to cycles per
second (1 Hz = 60 cycles per minute).
• From the Set Parameters Menu press
to display the Set
Fmax Menu.
• Press or to highlight a frequency maximum and
to select. You can also press or to move
horizontally across the columns.
In general the higher the operating speed of the machine, the higher
the Fmax needs to be to capture all crucial information. For vibration
involving fingered elements such as gear teeth, fan blades, pump
vanes, and bearing elements, an Fmax equal to 3 times the number
of fingers multiplied by the operating speed is usually sufficient. For
vibration not involving fingered elements, an Fmax equal to 10 times
the operating speed is usually sufficient. You can calculate the Fmax
yourself or the instrument can do it for you.
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Commtest Instruments vb Series Specifications

General

Brand	Commtest Instruments
Model	vb Series
Category	Measuring Instruments
Language	English

Summary

Section 2: Basic Operation

Mounting Sensors

Provides instructions on correctly attaching accelerometers and other sensors for accurate measurements.

Tachometer Setup

Section 3: Onsite Analysis - Measurement Menu

Walk-through: Taking Measurements

A step-by-step guide on performing onsite measurements using the instrument's Measure Mode.

Fault Types and Phase Relationships

Section 4: Manual Setup Measurement Parameters

Setting Measurement Parameters

Guides users through manually configuring all parameters for taking measurements.

Setting Spectrum Parameters

Setting Waveform Parameters

Section 5: Recording Data

Walk-through: Taking Recordings

Section 6: Using Routes

Walk-through: Taking Recordings Using a Route

Section 8: Creating Machines

Section 9: Balancing Rotors

The Balancing Process

Outlines the sequential steps involved in performing a rotor balancing procedure.

Trial Readings (Single/Dual Plane)

Covers taking initial and trial weight readings to determine imbalance.

Balance Weight Calculations

Introduces tools for calculating appropriate balance weights.

Section 10: Balancing Walk-through

Trial Weight Reading

Details the process of attaching and measuring the effect of a trial weight.

Trim Balance

Covers performing final adjustments to achieve the desired balance level.

Section 12: Troubleshooting

Resetting the Instrument

Steps for resetting a non-responsive instrument.

Power Problems