Extech Instruments VB450 Manuale utente
USER GUIDE
Vibration Meter
Model VB450
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EXTECH INSTRUMENTS
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Introduction
Thank you for selecting the Extech Instruments Model VB450.
The VB450 is a portable vibration meter consisting of an
acceleration sensor and a digital measurement display circuit.
It can be used to measure vibration displacement, speed (or
intensity) and acceleration of mechanical equipment.
Equipment such as fans, pumps, compressors, motors, etc. can
be tested.
This device is shipped fully tested and calibrated and, with
proper use, will provide years of reliable service.
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EXTECH INSTRUMENTS
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Safety Notes
Warning: Use extreme care when using this vibration meter to
test mechanical devices. Damage to meter and injury to
persons can occur if this meter is used in a manner not
specified in this User Guide or if nominal, preparatory safety
measures are not taken. Please refer to, and follow, the safety
directives below.
oDo not take measurements on devices where the range is
known to be, or expected to be, outside the specified
measurement range of this device.
oDo not use this instrument if its housing appears cracked,
chipped, or otherwise damaged.
oDo not use this instrument if the sensor or its cable appears
damaged or compromised in any way.
oReplace the battery as soon as the low battery symbol
appears on the meter display.
oRemove the battery if the device is to be stored for > 60
days.
oNever dispose of batteries in a fire. Batteries may explode
or leak.
oDo not attempt to charge the 9V battery. The supplied 9V
battery is not rechargeable. This meter was not designed to
use rechargeable batteries.
oIf the meter operates abnormally, stop testing and have
the unit serviced before further use.
oNever use the meter in a wet environment or in an
atmosphere of combustible or explosive gas.
oDo not open the meter housing; there are no user-
serviceable parts. Contact Extech Instruments directly or
contact point-of-sale personnel for service inquiries.
oProtect the meter’s LCD from shock or vibration; allow only
the magnet and sensor to touch the devices under test.
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EXTECH INSTRUMENTS
4VB450-en-GB_V1.0 6/15
Meter Description
1. LCD Display
2. Three-position switch (selects measurement units)
3. Sensor and magnet
4. Lanyard
5. Power and Data Hold button
6. Service access nut (do not loosen; for service use only)
7. Sensor secure nut (turn counter-clockwise to loosen)
Battery Compartment on rear of meter
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EXTECH INSTRUMENTS
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Operation
Battery Installation and Replacement
Remove the rear battery compartment door by sliding in the
direction of the arrow. Install or replace 9V battery (observe
polarity) and replace the cover.
During operation, if the symbol appears in the display
the battery needs to be replaced.
Never dispose of used batteries or rechargeable batteries in
household waste.
As consumers, users are legally required to take used
batteries to appropriate collection sites, the retail store
where the batteries were purchased, or wherever batteries
are sold.
Disposal: Do not dispose of this instrument in household waste. The
user is obligated to take end-of-life devices to a designated collection
point for the disposal of electrical and electronic equipment.
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EXTECH INSTRUMENTS
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Selecting units of measure
Press and hold the power button. The display will illuminate
and an arrow will indicate the units selected. Slide the function
switch on the top of the meter to select the units desired.
m/s2
Acceleration
Meters per second
squared
PEAK
mm/s
Velocity
Millimeters per second
squared
RMS
m
Displacement
micrometers
Peak to
Peak
Measurements
Attach the sensor to the device to be measured with the
magnet or hold the sensor for nonferrous materials. Press and
hold the power button to display the results. Release the
power button to freeze the results in the display. After 60
seconds the meter will automatically shut off.
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EXTECH INSTRUMENTS
7VB450-en-GB_V1.0 6/15
Specifications
General Specifications
Display 3 ½ digit LCD (0~1999)
Sensor Accelerometer (magnetic base)
Cable Length 0.2m (7.9”) coiled cable
Low battery indication symbol
Power supply 9V Battery
Battery life Approx. 20 hours (alkaline)
Operating conditions 0 to 40oC (32 to 104oF) <90% RH
Storage conditions 0 to 40oC (32 to 104oF) <80% RH
Dimensions 185 x 68 x 30mm (7.3 x 2.7 x 1.2”)
Weight 300 g (10.6 oz.) including battery
Safety Standards GB 4793, 1-2007
For indoor use only
Range and Accuracy
Function
Acceleration
(Peak)
Velocity
(RMS)
Displacement
(Peak to Peak)
Range
0.1 to 199.9m/s2
0.1 to
199.9mm/s
1 to 199.9m
Frequency
Response
10 to 1500Hz
10 to 1500Hz
10 to 500Hz
Accuracy
0 to 2.0m/s2
±(10%+ 1 digit)
>2.0m/s2
±(5%+ 1 digit)
0 to 2.0m/s
±(10%+ 1d)
>2.0m/s
±(5%+ 1d)
0 to 2.0μm
±(10%+ 1 digit)
>2μm
±(5%+ 1 digit)
ISO-9001 Certified
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