Bently Nevada vb8 Portable Data sheet

vb8 Portable Data Collector, Analyzer and
Balancer

Datasheet

Bently Nevada Machinery Condition Monitoring

Description

The vb8 Portable Data Collector, Analyzer and Balancer
instrument is a four-channel vibration data collector,
analyzer and balancer. You can use this device for on-route
and off-route data collection, machine-sideanalysis and
diagnosis as well as on-site dynamic balance correction.

The vb8 Portable Data Collector, Analyzer and Balancer is
certified for Class 1 Division 2 hazardous areas. It is
ergonomically designed and lightweight for all day comfort.

The vb8 provides recordings with up to 12,800 lines of
resolution and up to 80 kHz Fmax. Our patented adaptive
settling algorithm and 6Pack recording system offer quick,
one-step data recording.

The vb8 Portable Data Collector, Analyzer and Balancer has
plenty of storage and long battery life, and is backed by a five
year warranty.

The vb8 is one of Bently Nevada hardware monitoring assets
that work with System 1 software.

116M5343 Rev. G

The vb8 Portable Data Collector, Analyzer and Balancer
offers the following features:

l Four channel simultaneous recordings
l Two-plane balancing with up to 4 sensors
l Support for acceleration, velocity, displacement, DC-

coupled, current and voltage output sensors

l Triax-enabled
l 12,800 lines FFTresolution
l Supports 80 kHz Fmax
l 1 GB memory
l Spectrum and waveform recordings

vb8 Portable Data Collector, Analyzer and Balancer
Datasheet 116M5343 Rev. G

l Demodulation for early detection of

rotating machinery problems such as
bearing faults

l Unique 6Pack recording system
l Full analysis capabilities such as time

synchronous averaging, coastdown and
runup, bump test, cross-channel phase,
orbit plot, and long time waveform

l Modal Impact Testing and Cross Channel

Spectrum (ODS)

l Ability to export data in Universal File

Format (UFF) for additional analysis in
ODS software such as Vibrant
Technology ME'scope

l Numeric parameter input via keypad with

trend and alarm capability

l Sensor cable self-test feature
l Flex feature to add Remote Comms
l USB host port for data transfer to external

USB drive

l Upgradable Proflash system and free

firmware updates for 5 years

l Five-year warranty on the instrument

hardware

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vb8 Portable Data Collector, Analyzer and Balancer
Datasheet 116M5343 Rev. G

Specifications

Sensors

Sensor input

Compatible
sensor types

AC coupled
range

DC coupled
ranges

Connectors

Analog to
digital
conversion

Sensor
excitation
current

Sensor
detection

Tachometer Sensor

Sensor type

Laser sensor
range

Tachometer Input

Supported
sensor types

Power supply
to sensor

TTL pulse
rating

Keyphasor*
thresholds

Speed range

Four channels simultaneous
sampling

Accelerometer, velocity,
displacement, current, voltage
output and 4 to 20 mA

16 V peak-peak Allows for ± 8 V
sensor output swing (± 80 g)

0 V to 20 V, -10 V to 10 V, -20 V to 0 V

E.g. For reading prox-probe gap
1 x BNC (CH1) 1 x LEMO

(CH2/CH3/CH4)

Safety feature:Break-free inline
connector

24-bit ADC

0 mA or 2.2 mA (configurable), 24 V
maximum

2.2 mA required power for IEPE/ICP
type accelerometer

Warns if short circuit or not
connected

Laser sensor with reflective tape
Sensor triggers on beam reflection

10 cm to 2 m nominal Range
depends on size of reflective tape

Laser Tach, Contact, TTL Pulse,
Keyphasor

Instrument has optically isolated
input

5 V, 50 mA

3.5 V (4 mA) min 28 V (5 mA) max
Off-state 0.8 V

7.7 ± 0.5 V, 13.2 ± 0.8 V, 18.5 ± 1 V

Nominally 8 V, 13 V, 18 V
10 RPM to 300,000 RPM (0.2 Hz to 5

kHz)

Pulse width at least 0.1 ms

Accuracy ± 0.1 %

Output to
drive strobe

Up to 140 Hz (8400 CPM)

Typical Depends on strobe type
Special cable required

Parameter Indication

> 1000 g (10,000 m/s2) > 1000 in/sec

Maximum
levels (peak)

Dynamic
signal range

Harmonic
distortion

Units

Magnitude &
cursors

Base
accuracy

High
frequency
attenuation

AC coupling
attenuation

Attenuation
due to
Integration
(normal
mode)

Attenuation
due to
Integration
(low
frequency

(25,000 mm/s) > 20 in (500 mm) >
10,000 amps

Effective limit is sensor sensitivity and
output voltage

> 95 dB

typical at 400 line resolution
Less than -70 dB typical

Other distortions and noise are lower
g or m/s2 or adB in/s or mm/s or vdB

mil or mm or µm adB, vdB, amps, user
defined

0-peak, peak-peak or RMS Auto­scale by 1000x when required

US and SI options for adB and vdB
Overall RMS value Waveform True

pk-pk Dual cursors Harmonics

Digital readouts on chart
± 1% of readings approximately 0.1 dB

For AC signal: % of reading For DC
signal: % of full scale

≤ 0.1 dB 100 Hz to 10 kHz ≤ 3 dB >10 kHz
to 40 kHz

Attenuation tolerances are in
addition to base accuracy.

≤ 0.1 dB 10 Hz to <100 Hz ≤ 3 dB 1 Hz to
<10 Hz

≤ 0.1 dB 10 Hz to <100 Hz ≤ 1.5 dB 1 Hz to
<10 Hz

Values apply to single integration.
(Acceleration to velocity)

Double the values for double
integration (Acceleration to
displacement)

≤ 0.1 dB 1 Hz to <100 Hz
≤ 1.5 dB 0.2 Hz to <1 Hz

Applies when coupling = DC and
Fmax ≤ 100 Hz

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