Commtest Instruments vb Series User Manual

Section 11: Utilities
174
Baseline warnings (Applies to vb3000 only)
You can set Halt After Recording to prompt you when a new
recording is significantly above or below the baseline overall level.
This can be used to provide a basic check of data validity e.g. if the
overall level of the new recording is very different from the baseline
you may not have taken the measurement correctly. When the
warning option is turned on it will halt the display only if the recording
deviates a certain percentage from the baseline. This gives you a
chance to analyze the new recording and decide whether to re-take
the measurement or not.
Note: Baselines must be set within Ascent then sent to the
instrument. Please refer to the Ascent Software Reference Guide, for
details of how to set and display baseline recordings on the
instrument.
There are two levels of warning you can set:
The 'relaxed' warning will halt the display and activate the prompt
only if the new recording's overall level is lower than 25% or higher
than 200% of the baseline overall. If the overall level is within the
25% to 200% range the measurement will not halt. For example, if
your baseline overall level was 2 g and the measured rms level was
3 g the percentage is 150%. This is within the 'relaxed' range so the
recording will not halt.
The 'tight' warning will activate if the new recording's overall level is
lower than 50% or higher than 150% of the baseline overall level.
Note: The percentage displayed on the screen is limited to 999%. If
a measurement's overall level is higher than this number the
percentage will be rounded down to 999%.
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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