Commtest Instruments vb Series User Manual

Section 3: Onsite Analysis - Measurement Menu
51
• Press to select a machine, point and direction to save
the recording to. (We recommend saving each long time
waveform to a new measurement location as this makes it
easier to delete them individually.)
• Press
to begin recording and press again when you
wish to stop recording.
If you do not stop the recording manually the instrument will continue
sampling until the displayed time has elapsed, which indicates that
this memory chunk is full. When measuring, the instrument will
display a running count of the time (in seconds) that the recording
has taken rather than displaying the waveform being measured.
When measuring is finished the selected measurement location will
contain many individual recordings. Once these are transferred, the
Ascent software will connect all the recordings together in the correct
order to form one continuous waveform.
We recommend that you erase long time waveforms from the
instrument immediately after transferring them to the software, as the
very large number of recordings can considerably slow down menu
navigation.
Note: The instrument automatically uses the largest available chunk
of free memory. This can be considerably less that the total free
space if the memory has become 'fragmented' over a long period of
use. To de-fragment the memory, transfer all data from the
instrument to the software and perform a full memory erase (see
Erasing all Recordings on page
168).
Displaying a long time waveform in the software
When recording has finished the selected measurement location will
contain many individual 4096 sample recordings. Once these are
transferred the Ascent software will connect the recordings together
in the correct order to form a continuous waveform.
Note: In order to prevent the software's processing and display
speed from slowing down, a maximum of 100 recordings will be
joined together to create individual 'chunks' of a long time waveform.
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Commtest Instruments vb Series Specifications

General

Type	Vibration Analyzer
Storage Temperature	-20°C to 60°C
Channels	1 or 2
Data Storage	Internal memory and removable SD card
Display	Color LCD
Power	Rechargeable battery
Connectivity	USB
Battery Life	Up to 8 hours

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