Extech Instruments 407850 Manuale utente
User's Guide
Heavy Duty Vibration Meter
Model 407850
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Model 407850 Version 1.2 December 2005
2
Introduction
Congratulations on your purchase of the Extech 407850 Vibration Meter. The 407850
can confirm normal vibration levels and detect abnormal levels in industrial machinery
due to poor balancing, misalignment, structural compromises, and other factors. Careful
use of this meter will provide years of reliable service.
Specifications
General Specifications
Display 3-1/2 digit LCD
Measurement ranges Velocity: 0.02 to 7.87 inches/sec (0.5 to 199.9 mm/sec)
Acceleration: 2 to 656 ft/s2(0.5 to 199.9 m/s2)
Frequency range 10Hz to 1KHz (frequency sensitivity meets ISO-2954)
Accuracy ± (5% of reading + 2 digits)
Calibration points Velocity: 50mm/sec @ 160Hz
Acceleration: 50m/s2@ 160Hz
Sampling time One (1) second approx.
Data output Isolated serial RS-232 PC Interface
Data Hold Freezes displayed reading
Min/Max Memory Meter stores highest and lowest readings for later recall
Auto Power OFF Meter automatically shuts off after 30 minutes of inactivity
Low battery indication Battery symbol appears on the LCD
Power supply 9V Battery
Power consumption 6mA DC approx.
Operating Temperature 32 to 122oF (0 to 50oC)
Operating Humidity Less than 80% RH
Dimensions Meter: 7.1 x 2.8 x 1.3" (180 x 72 x 32mm)
Probe: 0.75” (19mm) diameter x 0.83” (21mm)
Weight Meter: Approx. 0.5 lbs (230g)
Probe with magnetic base: 0.09 lbs (38g)
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Model 407850 Version 1.2 December 2005
3
Meter Description
1. Probe connector
2. RS-232 Connector
3. LCD Display
4. Function switches and pushbuttons
5. Probe cable
6. Probe
7. Magnetic base
8. Rubber meter jacket
9. Battery compartment (on rear)
Meter Operation
Connecting the Probe
1. Note that this meter accepts only the supplied vibration probe.
2. Plug the BNC connector side of the probe into the BNC connector at the top of the
meter.
3. The probe can be connected to the machinery under test in three ways.
a. Attach the magnetic end of the probe to a ferrous material on the equipment under
test.
b. Hold the probe in place against the equipment under test manually.
c. Unscrew the magnet from the probe end and use the threaded mount to connect to
a screw, bolt, or stud on the equipment under test.
Powering the meter
1. Press the POWER button to turn the meter ON or OFF.
2. The meter is equipped with an automatic power off utility that conserves battery life. If
the meter is left inactive for 10 minutes it will automatically turn off. The automatic
power off utility is disabled in the RECORD mode (see below).
Using the Selector switches
1. RMS/PEAK Switch: Select the RMS setting for RMS measurements. Select the PEAK
mode for peak measurements. Peak measurements are derived from the RMS reading
multiplied by 1.414.
2. ACC/VEL Switch: Use this switch to select ACCELERATION measurements or
VELOCITY measurements. Note that VELOCITY measurements are the most widely
used measurements in industrial applications.
3. METRIC/ENGLISH Switch: Use this switch to select the desired units’ convention.
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Model 407850 Version 1.2 December 2005
4
Zero Adjustment Procedure
Please perform a zero calibration before each use. This will ensure the highest accuracy.
Note: If the meter is used for a long period of time, temperature change and battery power
loss may cause the zero calibration to drift. For continued precision measurement, the
meter’s zero calibration should be readjusted.
1. Set the ACC/VEL switch to the ACC (Acceleration) position.
2. Insure that there is no signal present at the vibration sensor.
3. Remove the protective rubber holster and open the battery cover (described below).
4. Use a screwdriver to adjust the “Zero adjust VR5” potentiometer until the display
reads 0000.
Data Hold
To freeze the LCD display, press the HOLD key. The 'D.H.' hold icon will appear at the top
of the LCD. Press the HOLD key again to return to normal operation (the 'D.H.' hold icon
will switch off).
MIN / MAX RECORD / RECALL Modes
To begin capturing the Minimum (MIN) and Maximum (MAX) vibration values, press the
RECORD key (‘REC’ will appear on the LCD). After taking measurements in the RECORD
mode, press the RECALL button. ‘MAX’ will appear on the display along with the highest
reading recorded since the RECORD button was pressed. Press the RECALL button again
to view the lowest reading (‘MIN’ will appear on the display). To return to normal operation,
press the RECORD button. ‘REC’ will switch off indicating that the meter has returned to
the normal mode.
RS-232 Serial PC Interface
The meter is equipped with an RS-232 serial data port (located at the top of the meter next
to the probe input jack). This interface was designed to operate with the Extech Data
Acquisition Software (PN 407001) and enables the user to capture, store and display
readings on a PC. For more information, contact Extech or refer to the 407001 user
manual for details.
VR5
Rear View of 407850
Battery Compartment
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Model 407850 Version 1.2 December 2005
5
Support Hotline (781) 890-7440
Website: www.extech.com
Battery Replacement
When the 9V battery voltage falls to a critical level, the ‘LBT’ indicator appears on the LCD.
Follow these steps to replace the battery:
1. Remove the probe and the RS-232 cable from the meter.
2. Remove the rubber boot that encases the entire meter by pulling it over the bottom of
the meter.
3. Open the battery compartment (located on the lower back of the meter) with a flat head
screwdriver.
4. Replace the 9V battery, replace the compartment cover, and affix the rubber boot.
Warranty
EXTECH INSTRUMENTS CORPORATION warrants this instrument to be free of defects in parts and workmanship for
three years from date of shipment (a six month limited warranty applies on sensors and cables). If it should become
necessary to return the instrument for service during or beyond the warranty period, contact the Customer Service
Department at (781) 890-7440 ext. 210 for authorization or visit our website at www.extech.com (click on ‘Contact
Extech’ and go to ‘Service Department’ to request an RA number). A Return Authorization (RA) number must be
issued before any product is returned to Extech. The sender is responsible for shipping charges, freight, insurance and
proper packaging to prevent damage in transit. This warranty does not apply to defects resulting from action of the
user such as misuse, improper wiring, operation outside of specification, improper maintenance or repair, or
unauthorized modification. Extech specifically disclaims any implied warranties or merchantability or fitness for a
specific purpose and will not be liable for any direct, indirect, incidental or consequential damages. Extech's total
liability is limited to repair or replacement of the product. The warranty set forth above is inclusive and no other
warranty, whether written or oral, is expressed or implied.
Calibration and Repair Services
Extech offers complete repair and calibration services for all of the products we sell.
For periodic calibration, NIST certification on most products or repair of any Extech
product, call customer service for details on services available. Extech recommends that
calibration be performed on an annual basis to ensure calibration integrity.
Copyright ©2005 Extech Instruments Corporation.
All rights reserved including the right of reproduction in whole or in part in any form.
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Model 407850 Version 1.2 December 2005
6
Appendix: Machinery Classification
When evaluating machinery and equipment it is useful to know their classification range
and group type. There are four machine groups and classification ranges recognized
internationally. The limits for vibration severity (mm/s) are shown in the Tables below:
GROUP K – Small Machinery up to 15KW (for example, production motors)
Testing Status Vibration Severity (mm/s)
Good 0 to 0.71
Acceptable 0.72 to 1.80
Permissible 1.81 to 4.5
Dangerous Greater than 4.5
GROUP M – Medium-sized Machinery up to 75KW (for example, motors without
special foundations)
Testing Status Vibration Severity (mm/s)
Good 0.00 to 1.12
Acceptable 1.13 to 2.80
Permissible 2.81 to 7.10
Dangerous Greater than 7.10
GROUP G – Large Machinery on Heavy Foundations
Testing Status Vibration Severity (mm/s)
Good 0.00 to 1.80
Acceptable 1.81 to 4.50
Permissible 4.51 to 11.20
Dangerous Greater than 11.20
GROUP T – Large Turbo Machinery on Special Foundations
Testing Status Vibration Severity (mm/s)
Good 0 to 2.80
Acceptable 2.81 to 7.10
Permissible 7.11 to 18.00
Dangerous Greater than 18.00
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