Extech Instruments 461893 User manual

User's Manual

Digital Photo Tachometer

Model 461893

www. .com information@itm.com1.800.561.8187

461893-EN V1.4 8/13 2

Introduction

Congratulations on your purchase of the Extech 461893 Photo Tachometer. This device provides

non-contact measurements over a wide range (5 to 100,000 RPM). A reflective mark on the object

to be measured is used as a target for the meter's integral light beam. Careful use of this meter will

provide years of reliable service.

Specifications

General Specifications

Meter circuitry Custom one-chip LSI microprocessor

Time base Quartz crystal

Display 5-digit (99999 count) 0.4" (10mm) multi-function LCD

Measurement 5 to 99,999 RPM in 2 ranges

Range select Automatic

Data Recording LAST / MIN / MAX readings stored for later recall

Sampling time 1 second (over 60 rpm)

Target distance 2 to 6" (50 to 150mm) depending on ambient light

Operating Temperature 32°F to 122°F (0°C to 50°C)

Power Supply 4 x 1.5V 'AA' batteries

Power Consumption Approximately 150 mA

Weight 8.8 oz. (250 g) including battery

Size 6.7 x 2.8 x1.5" (170 x 72 x 37mm)

Accessories Reflective tape (23") and carrying case

Range Specifications

Measurement Range Resolution Accuracy

RPM 5 to 999.9 RPM

1,000 to 99,999 RPM

0.1 RPM

1 RPM

+(0.05% + 1 digit)

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461893-EN V1.4 8/13 3

Meter Description

1. Photo source

2. LCD Display

3. Memory record button

4. Battery compartment on rear

5. Measure button

Meter Operation

RPM Measurements

1. Apply a small piece of reflective tape to the object under test as shown below.

2. Point the meter's photo source at the tape on the object and press the Measure button. Hold the

meter from 2 to 6" (50 to 150mm) from the reflective tape depending on ambient light.

3. Check that the Monitor icon flashes on the LCD indicating that the meter is sensing a reflection

from the tape. If the monitor does not appear check that the light source is hitting the reflective

tape at a 90o angle.

4. Release the Measure button when the display stabilizes (2 seconds approx.). Note the LCD

RPM reading.

5. If the RPM value is < 50, apply additional pieces of reflective tape (four pieces are shown

below). Divide the LCD reading by the number of reflective tapes to compute the actual RPM

(Actual RPM = Reading / 4).

Photo Tachometer

Rotating object

Reflective tape

Light source

and reflection

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461893-EN V1.4 8/13 4

Memory Record and Recall

The meter automatically records the Minimum and Maximum readings. These represent the lowest

and highest readings measured from the moment the Measure button is pressed to the moment it is

released. The Last reading is also recorded; this is the last measurement taken before the Measure

button is released. These stored readings can be displayed on the LCD using the Memory button as

described below:

1. Press once and hold: The Last reading is displayed followed by "LA"

2. Press again and hold: The Maximum value is displayed followed by the word "UP"

3. Press again and hold: The Minimum value is displayed followed by "dn"

Special Measurement Considerations

1. The non-reflective area of the object under test must always be greater than the reflective tape

area.

2. If the shaft of the object under test is reflective, it should be covered with black tape or paint

before attaching reflective tape.

Battery Replacement

The low battery indication appears as "LO" on the display. To replace the batteries:

1. Slide the rear cover off the battery compartment in the direction indicated by the arrow.

2. Replace the four 1.5V 'AA' batteries and the battery compartment cover.

3. Remove the batteries if the instrument will be stored for long periods of time.

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461893-EN V1.4 8/13 5

Warranty

FLIR Systems, Inc. warrants this Extech Instruments brand device 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 for authorization. Visit

the website for contact information. A Return Authorization (RA) number must be issued before any product is

returned. 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. FLIR Systems, Inc. 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. 

FLIR 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, Repair, and Customer Care Services

FLIR Systems, Inc. offers repair and calibration services for the Extech Instruments products we

sell. NIST certification for most products is also provided. Call the Customer Service Department for

information on calibration services available for this product. Annual calibrations should be

performed to verify meter performance and accuracy. Technical support and general customer

service is also provided, refer to the contact information provided below.

Support Lines: U.S.

Technical Support: Option 3; E mail:

Repair & Returns: Option 4; E mail:

Product specifications are subject to change without notice

Please visit our website for the most up to date information

FLIR Commercial Systems, Inc.

ISO 9001 Certified

www. .com information@itm.com1.800.561.8187

461893-EN V1.4 8/13 6

Garantie

FLIR Systems, Inc. garantit que cet appareil Extech Instruments est exempt de défauts matériaux et de fabrication pendant un

an à partir de la date 

d envoi (une garantie limitée de six mois 

s applique aux capteurs et aux câbles). Si le renvoi de 

l appareil

pour réparation devient nécessaire durant ou après la période de garantie, contactez le service client pour autorisation. Pour

obtenir les coordonnées, visitez le site Web suivant : . Un numéro 

d autorisation de retour (AR) doit être délivré

avant tout retour de produit. 

L expéditeur prend à sa charge les frais 

d expédition, le fret, 

l assurance et 

l emballage correct de



l appareil afin de prévenir toute détérioration durant le transport. Cette garantie ne 

s applique pas aux dommages imputables à



l utilisateur, tels que 

l usage impropre ou abusif, un mauvais câblage, une utilisation non conforme aux spécifications, un

entretien ou une réparation incorrecte, ou toute modification non autorisée. FLIR Systems, Inc. déclinera spécifiquement toute

garantie ou qualité marchande ou aptitude à 

l emploi prévu, et ne sera en aucun cas tenu responsable pour tout dommage

conséquent, direct, indirect ou accidentel. La responsabilité totale de FLIR est limitée à la réparation ou au remplacement du

produit. La garantie définie ci dessus est inclusive et aucune autre garantie, écrite ou orale, 

n est exprimée ou implicite.

Calibrage, réparation et services après vente

FLIR Systems, Inc. offre des services de calibrage et de réparation pour les produits Extech

Instruments que nous commercialisons. Nous fournissons également une certification NIST pour la

plupart des produits. Contactez notre service client pour toute information sur les services de

calibrage disponibles pour ce produit. Un calibrage doit être effectué chaque année pour vérifier

les performances et la précision du mètre. Nous offrons également une assistance technique et un

service à la clientèle. Veuillez vous reporter aux coordonnées fournies ci dessous.

Lignes 

d assistance: États Unis

Service 

d assistance technique : Option 3 ; E mail :

Réparations et retours : Option 4 ; E mail :

Les spécifications produit sont sujettes à modifications sans préavis.

Pour les toutes dernières informations, veuillez visiter notre site Web.

FLIR Commercial Systems, Inc.

Certifié ISO 9001

www. .com information@itm.com1.800.561.8187

461893-EN V1.4 8/13 7

Garantía

FLIR Systems, Inc., garantiza este dispositivo marca Extech Instruments para estar libre de defectos en partes o mano de obra

durante un año a partir de la fecha de embarque (se aplica una garantía limitada de seis meses para cables y sensores). Si fuera

necesario regresar el instrumento para servicio durante o después del periodo de garantía, llame al Departamento de Servicio a

Clientes para obtener autorización. Visite para Información de contacto. Se debe expedir un número de

Autorización de Devolución (AD) antes de regresar cualquier producto. El remitente es responsable de los gastos de embarque,

flete, seguro y empaque apropiado para prevenir daños en tránsito. Esta garantía no se aplica a defectos resultantes de las

acciones del usuario como el mal uso, alambrado equivocado, operación fuera de las especificaciones, mantenimiento o

reparación inadecuada o modificación no autorizada. FLIR Systems, Inc., rechaza específicamente cualesquier garantías

implícitas o factibilidad de comercialización o idoneidad para cualquier propósito determinado y no será responsable por

cualesquier daños directos, indirectos, incidentales o consecuentes. La responsabilidad total de FLIR está limitada a la

reparación o reemplazo del producto. La garantía precedente es inclusiva y no hay otra garantía ya sea escrita u oral, expresa o

implícita.

Servicios de calibración, reparación y atención a clientes

FLIR Systems, Inc., ofrece servicios de reparación y calibración para los productos que vendemos

de Extech Instruments. Además ofrecemos certificación NIST para la mayoría de los productos.

Llame al Departamento de Servicio al Cliente para solicitar información de calibración para este

producto. Para verificar el funcionamiento y precisión se debe realizar la calibración anual. Además

se provee Soporte Técnico y servicios generales al cliente, consulte la información de contacto en

seguida.

Reservados todos los derechos, incluyendo el derecho de reproducción total o parcial en cualquier medio

Líneas de soporte: EE.UU.

Soporte Técnico Opción 3; correo electrónico:

Reparación / Devoluciones: Opción 4; correo electrónico:

Las especificaciones del producto están sujetas a cambios sin aviso

Por favor visite nuestra página en Internet para la información más actualizada

FLIR Commercial Systems, Inc.,

Certificado ISO 9001

www. .com information@itm.com1.800.561.8187

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