EXTECH 480403

User's Guide
Phase Sequence and Motor
Rotation Tester
Model 480403
Congratulations on your purchase of the Extech Model 408403
Motor and Phase Rotation Indicator. This handheld instrument
detects the rotational field of three-phase systems and determines
motor-rotation direction. Color-coded test leads are provided for
connecting to the system or motor under test. This meter is shipped
fully tested and calibrated and, with proper use, will provide years
of reliable service.
International Safety Symbols
Caution ! Refer to the explanation in this Manual
Caution ! Risk of electric shock
Earth (Ground)
Double Insulation or Reinforced insulation
AC, Alternating Current or Voltage
DC, Direct Current or Voltage
Safety Procedures
To avoid possible electric shock or fire, observe the following:
Read the following information carefully before using or
servicing the instrument.
Adhere to local and national safety codes.
Individual protective equipment must be used to prevent
shock and injury.
Use of instrument in a manner not specified by the
manufacturer may impair safety features/protection provided
by the equipment.
Avoid working alone.
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Inspect the test leads for damaged insulation or exposed
metal. Check test lead continuity. Damaged leads must be
replaced. Do not use the meter if it appears damaged.
Use care when working above 30V ac rms, 42V ac peak and
60V dc. Such voltages pose a shock hazard.
When using the probes, keep fingers away from probe
contacts. Keep fingers behind the finger guards on the
Measurements can be adversely affected by impedances of
additional operating circuits connected in parallel or by
transient currents.
Verify operation prior to measuring hazardous voltages
(voltages above 30V ac rms, 42V ac peak and 60V dc).
Do not use the meter with any of the parts removed.
Do not use the meter near explosive gas, vapor, or dust.
Do not use the meter in a wet environment.
warrants this instrument to be free of defects in parts and
workmanship for one year from date of shipment (a six month limited
warranty applies to 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
www.extech.com for contact information. 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.
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Meter Description
L1 test Lead input to meter
L3 test lead input to meter
L2 test lead input to meter
L1 status LED
Orientation symbol for noncontact testing
L3 status LED
L2 status LED
Power ON status LED
ON button
10. Left/Right Clockwise/CounterClockwise status LEDs
11. Test lead alligator clips
Determine Phase Rotation Direction
1. Connect the supplied color-coded test leads to the meter’s test lead
input jacks at the top of the meter.
2. Connect the test probes to the three mains phases for the system
under test.
3. Press the ON/OFF button to turn the meter on.
4. L1, L2, and L3 indicators will illuminate for each phase connected,
5. The clockwise and counter-clockwise arrows with the left/right ‘L’ or
‘R’ icons display the phase rotation direction (phase sequence) of
mains as connected.
6. To understand the status of a test, based on the condition of the
meter’s front panel LEDs , refer to the table printed on the meter:
Note: The rotational indicator LEDs illuminate even if one of the test
probes is connected to a neutral or ground conductor instead of one
of the mains phases.
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Check Motor Turn Direction (contact method)
1. Connect the supplied color-coded test leads to the meter’s test
lead input jacks at the top of the meter.
2. Connect the test (alligator) probes to the three motor connections
(L1 to U, L2 to V, and L3 to W).
3. Press the ON/OFF button. The green ON indicator shows that the
instrument is ready for testing.
4. Turn the motor shaft half of a revolution towards the right.
5. The clockwise and counter-clockwise arrows with the left/right ‘L’
or ‘R’ icons display the orientation of the motor.
Check Motor Turn Direction (non-contact method)
1. Disconnect the test leads from the meter and from any other
devices under test.
2. Hold the meter close (one
inch or closer) to the motor,
parallel to the length of the
motor shaft.
3. The bottom of the meter
should face the drive shaft
and the back of the meter
should be flush with the motor
(refer to diagram at right).
Note: There is an orientation
symbol on the meter to assist.
4. Press the ON/OFF button. The green ON indicator shows that the
instrument is ready for testing.
5. The orientation of the motor is represented by the clockwise and
counter-clockwise arrows with the left/right ‘L’ or ‘R’ icons display.
Face the rear of the motor (meter will appear upside down) when
reading the status of the display LEDs.
Note: The meter will not operate with motors controlled by
frequency converters.
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Magnetic Field Detection
1. Hold the meter in the area under test.
2. A magnetic field is present if either the clockwise or the counterclockwise LED illuminates.
Battery replacement
The meter uses a 9V battery (supplied) as a power source. If the green
LED does not light when the ON/OFF button is pressed, replace the
Place the meter on a clean, flat, non-abrasive surface.
Loosen the rear bottom Phillips head screw to access the
battery compartment.
Lift the battery access door and replace the 9V battery observing
Place the battery carefully in the compartment without crimping
the black and red battery connecting wire.
Close the access door and secure the screw.
Calibration and Repair Services
Extech offers repair and calibration services for the products we
sell. Extech also provides NIST certification for most products. Call
the Customer Care Department for information on calibration services
available for this product. Extech recommends that annual
calibrations be performed to verify meter performance and accuracy.
Support line (781) 890-7440
Technical Support: Extension 200; E-mail: [email protected]
Repair & Returns: Extension 210; E-mail: [email protected]
Product specifications subject to change without notice
For the latest version of this User Guide, Software updates, and other
up-to-the-minute product information, visit our website: www.extech.com
Extech Instruments Corporation, 285 Bear Hill Road, Waltham, MA 02451
Copyright © 2008 Extech Instruments Corporation (a FLIR company)
All rights reserved including the right of reproduction in whole or in part in any form.
480403 V3.1 2/09
Environmental Specifications
Operating Temperature
32 to 104 F (0 to 40 C)
Operating Humidity
15 to 85% relative humidity
Operating altitude
Pollution Degree 2
DIN / VDE 0411
IEC 61010
DIN / VDE 0413-7
Mechanical Specifications
(130 x 69 x 32mm)
(H x W x D): 5.1 x 2.7 x 1.3”
4.6 oz. (130g)
Safety Specifications
Electrical Safety Approvals
IEC 61010/EN61010,
IEC 61557-7/EN 61557-7
Maximum Operating Voltage (Ume)
600 V
Protection Levels
CAT lll 600V
Electrical Specifications
Battery type
9V battery
Current Consumption
20mA max.
Battery life
One (1) year minimum
Nominal Voltage
40 to 600 VAC
Frequency Range (fn)
2 to 400Hz
Nominal Test current (in per phase)
< 3.5mA
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