© 2009-2018 Fluke Corporation. All rights reserved. Specications are subject
to change without notice. All product names are trademarks of their respective
companies.
930/931
Tachometer
Users Manual
English
PN 4971074
January 2009, Rev. 2, 5/18
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LIMITED WARRANTY AND LIMITATION OF LIABILITY
Each Fluke product is warranted to be free from defects in material and workmanship
under normal use and service. The warranty period is one year and begins on the date of
shipment. Parts, product repairs, and services are warranted for 90 days. This warranty
extends only to the original buyer or end-user customer of a Fluke authorized reseller,
and does not apply to fuses, disposable batteries, or to any product which, in Fluke’s
opinion, has been misused, altered, neglected, contaminated, or damaged by accident
or abnormal conditions of operation or handling. Fluke warrants that software will operate
substantially in accordance with its functional specications for 90 days and that it has
been properly recorded on non-defective media. Fluke does not warrant that software will
be error free or operate without interruption.
Fluke authorized resellers shall extend this warranty on new and unused products to
end-user customers only but have no authority to extend a greater or different warranty
on behalf of Fluke. Warranty support is available only if product is purchased through a
Fluke authorized sales outlet or Buyer has paid the applicable international price. Fluke
reserves the right to invoice Buyer for importation costs of repair/replacement parts when
product purchased in one country is submitted for repair in another country.
Fluke’s warranty obligation is limited, at Fluke’s option, to refund of the purchase price,
free of charge repair, or replacement of a defective product which is returned to a Fluke
authorized service center within the warranty period.
To obtain warranty service, contact your nearest Fluke authorized service center to
obtain return authorization information, then send the product to that service center,
with a description of the difculty, postage and insurance prepaid (FOB Destination).
Fluke assumes no risk for damage in transit. Following warranty repair, the product will
be returned to Buyer, transportation prepaid (FOB Destination). If Fluke determines that
failure was caused by neglect, misuse, contamination, alteration, accident, or abnormal
condition of operation or handling, including overvoltage failures caused by use outside
the product’s specied rating, or normal wear and tear of mechanical components, Fluke
will provide an estimate of repair costs and obtain authorization before commencing the
work. Following repair, the product will be returned to the Buyer transportation prepaid
and the Buyer will be billed for the repair and return transportation charges (FOB
Shipping Point).
THIS WARRANTY IS BUYER’S SOLE AND EXCLUSIVE REMEDY AND IS IN LIEU
OF ALL OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT
LIMITED TO ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR
A PARTICULAR PURPOSE. FLUKE SHALL NOT BE LIABLE FOR ANY SPECIAL,
INDIRECT, INCIDENTAL, OR CONSEQUENTIAL DAMAGES OR LOSSES, INCLUDING
LOSS OF DATA, ARISING FROM ANY CAUSE OR THEORY.
Since some countries or states do not allow limitation of the term of an implied warranty,
or exclusion or limitation of incidental or consequential damages, the limitations and
exclusions of this warranty may not apply to every buyer. If any provision of this Warranty
is held invalid or unenforceable by a court or other decision-maker of competent
jurisdiction, such holding will not affect the validity or enforceability of any other provision.
11/ 99
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LIMITED WARRANTY AND LIMITATION OF LIABILITY
Each Fluke product is warranted to be free from defects in material and workmanship
under normal use and service. The warranty period is one year and begins on the date of
shipment. Parts, product repairs, and services are warranted for 90 days. This warranty
extends only to the original buyer or end-user customer of a Fluke authorized reseller,
and does not apply to fuses, disposable batteries, or to any product which, in Fluke’s
opinion, has been misused, altered, neglected, contaminated, or damaged by accident
or abnormal conditions of operation or handling. Fluke warrants that software will operate
substantially in accordance with its functional specications for 90 days and that it has
been properly recorded on non-defective media. Fluke does not warrant that software will
be error free or operate without interruption.
Fluke authorized resellers shall extend this warranty on new and unused products to
end-user customers only but have no authority to extend a greater or different warranty
on behalf of Fluke. Warranty support is available only if product is purchased through a
Fluke authorized sales outlet or Buyer has paid the applicable international price. Fluke
reserves the right to invoice Buyer for importation costs of repair/replacement parts when
product purchased in one country is submitted for repair in another country.
Fluke’s warranty obligation is limited, at Fluke’s option, to refund of the purchase price,
free of charge repair, or replacement of a defective product which is returned to a Fluke
authorized service center within the warranty period.
To obtain warranty service, contact your nearest Fluke authorized service center to
obtain return authorization information, then send the product to that service center,
with a description of the difculty, postage and insurance prepaid (FOB Destination).
Fluke assumes no risk for damage in transit. Following warranty repair, the product will
be returned to Buyer, transportation prepaid (FOB Destination). If Fluke determines that
failure was caused by neglect, misuse, contamination, alteration, accident, or abnormal
condition of operation or handling, including overvoltage failures caused by use outside
the product’s specied rating, or normal wear and tear of mechanical components, Fluke
will provide an estimate of repair costs and obtain authorization before commencing the
work. Following repair, the product will be returned to the Buyer transportation prepaid
and the Buyer will be billed for the repair and return transportation charges (FOB
Shipping Point).
THIS WARRANTY IS BUYER’S SOLE AND EXCLUSIVE REMEDY AND IS IN LIEU
OF ALL OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT
LIMITED TO ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR
A PARTICULAR PURPOSE. FLUKE SHALL NOT BE LIABLE FOR ANY SPECIAL,
INDIRECT, INCIDENTAL, OR CONSEQUENTIAL DAMAGES OR LOSSES, INCLUDING
LOSS OF DATA, ARISING FROM ANY CAUSE OR THEORY.
Since some countries or states do not allow limitation of the term of an implied warranty,
or exclusion or limitation of incidental or consequential damages, the limitations and
exclusions of this warranty may not apply to every buyer. If any provision of this Warranty
is held invalid or unenforceable by a court or other decision-maker of competent
jurisdiction, such holding will not affect the validity or enforceability of any other provision.
Fluke Corporation
P.O. Box 9090
Everett, WA
98206-9090
U.S.A.
Fluke Europe B.V.
P.O. Box 1186
5602 BD Eindhoven
The Netherlands
11/ 9 9
To register your product online, visit http://register.uke.com
930/931 Tachometer
CONTENTS
Introduction ............................................................................................................ 1
Safety .................................................................................................................... 1
Symbols ................................................................................................................. 2
Included Accessories ............................................................................................. 2
The Keypad ........................................................................................................... 2
The Display............................................................................................................ 3
Operation ............................................................................................................... 4
Conguration (Fluke 931)................................................................................. 4
Optical (Non-Contact) ...................................................................................... 4
Contact (Fluke 931).......................................................................................... 4
Surface Speed and Length (Fluke 931) ........................................................... 5
Contact Wheel Use (Fluke 931) ....................................................................... 5
Max, Min and Av Readings .............................................................................. 5
Maintenance .......................................................................................................... 6
Replacing the batteries .................................................................................... 6
Cleaning ........................................................................................................... 6
Specications ........................................................................................................ 6
RPM ....................................................................................................................... 6
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Feature 930 931 Feature 930 931
A Mechanical Adapter
F Reector Strip
B Shaft Contacts G Display
C Contact wheel 0.1 m H Memory key
D Contact wheel 6 inch I Function key
E Shaft Extention J ON key
TACHOMETER
931
4
5
6
7
9
10
8
3
1
2
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1
INTRODUCTION
The Fluke 930 Tachometer and the Fluke 931 Tachometer (the Tachometer) are
hand-held instruments that accurately measure rotational Revolutions Per Minute
(RPM). The Fluke 931 measures surface speed as well as length. Use the red
beam function to make non-contact RPM measurements. The Fluke 931 uses the
mechanical adapter and selectable tip to make contact RPM measurements. The
Memory function allows storing the maximum (MAX), minimum (MIN), average
(AV), and last reading.
SAFETY
A Warning identies the conditions and procedures that are dangerous to the
user.
Warning
To prevent possible electrical shock, re, or personal injury:
● Carefully read all instructions.
● Read all safety information before you use the Product.
● Use the Product only as specied, or the protection supplied by the
Product can be compromised.
● Do not use the Product around explosive gas, vapor, or in damp or
wet environments.
● Do not use and disable the Product if it is damaged.
● Replace the batteries when the low battery indicator shows to
prevent incorrect measurements.
● Remove the batteries if the Product is not used for an extended
period of time, or if stored in temperatures above 50 °C. If the
batteries are not removed, battery leakage can damage the Product.
● Do not use the Product if it operates incorrectly.
● Do not wear loose clothing when making measurement around
moving machinery.
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2
SYMBOLS
The following symbols are used on the Product and in this manual.
Symbol Description
WARNING.RISK OF DANGER.
»
Consult user documentation.
Battery or battery compartment.
Ã
Conforms to relevant South Korean EMC Standards.
¡
Conforms to relevant Australian Safety and EMC standards.
Conforms to European Union directives.
This product complies with the WEEE Directive marking
requirements. The afxed label indicates that you must not
discard this electrical/electronic product in domestic household
waste. Product Category: With reference to the equipment
types in the WEEE Directive Annex I, this product is classed as
category 9 “Monitoring and Control Instrumentation” product. Do
not dispose of this product as unsorted municipal waste.
INCLUDED ACCESSORIES
The following accessories are included with the Tachometer:
Accessories 930 931
0.1 m Contact Wheel
6 in Contact Wheel
Cone Shaft Contact
Internal Cone Shaft Contact
Shaft Extension
10 Reective Strips
THE KEYPAD
Key Description
M
Selects MAX, MIN, AV, and last reading
O
Turns ON the Tachometer and makes selections.
The Tachometer turns OFF after 30 seconds of inactivity.
F
Selects the Measurement function
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3
THE DISPLAY
Item 930 931 Description
A
Optical RPM measurement
B
Contact RPM measurement
C
Meters per minute
D
Meters per second
E
Feet per minute
F
Feet per second
G
Inches per minute
H
Trigger display
I
Memory, last stored reading
J
Memory, maximum reading
K
Memory, minimum reading
L
Memory, average reading
M
Low battery indicator
N
Numerical reading
1 2 3 5 64 7 8
9
10
11
12
13
14
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4
OPERATION
Press O to power up the Tachometer. The display test illuminates all LCD
segments for 1 second and then shows the congured surface speed selection.
• The last selected mode appears at when the Tachometer is turned ON.
• The Tachometer automatically turns OFF after 30 seconds of inactivity.
CONFIGURATION (FLUKE 931)
To congure the Tachometer for the correct contact wheel used for surface speed
measurements:
1. Turn ON the Tachometer.
2. Press M and F release.
3. Use F to select 0.1 (0.1 m circumference small wheel) or 6” (6 inch
circumference large wheel). A 12” wheel is not available.
OPTICAL (NON-CONTACT)
To measure RPM using the non-contact red beam, remove the mechanical
adapter from the top of Tachometer. Pull the adapter straight out to remove. See
Figure 2.
1. Stop the rotating device to measure.
2. Clean a spot for the reective strip.
3. Place reective strip on rotating device.
4. Turn ON the Tachometer.
5. On the Fluke 931 use F to select RPM.
6. Aim Tachometer at rotating reective strip keeping within 500 mm (20 inches).
7. Press
O to enable the red beam.
8. When the Tachometer is triggered by the reective strip, the trigger symbol on
the display ashes and RPM will be displayed.
CONTACT (FLUKE 931)
To use the Tachometer for contact measurement, insert the mechanical adapter
into top of the Tachometer, see Figure 1:
1. To measure, connect the cone or internal cone shaft contact to the end of the
shaft.
2. Turn ON the Tachometer and use F to select RPM C.
3. Press
O to take measurements.
4. When the Tachometer is triggered, the trigger symbol ashes and the RPM is
displayed.
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5
SURFACE SPEED AND LENGTH (FLUKE 931)
Surface speed and length can be measured using the mechanical adapter and
contact wheel.
Range
0.1 m circumference
small wheel
6 inch circumference
large wheel
m/min 0.10 to 1999 0.10 to 1524
ft/min 0.40 to 6550 0.40 to 5000
in/min 4.0 to 78700 4.00 to 60000
m/sec 0.10 to 33.30 0.10 to 25.40
ft/sec 0.10 to 109 0.10 to 83.33
m 0 to 99999 0 to 99999
ft 0 to 99999 0 to 99999
in 0 to 99999 0 to 99999
CONTACT WHEEL USE (FLUKE 931)
1. Insert mechanical adapter into the top of the Tachometer. See Figure 1.
2. Select either the 0.1 m or 6 in contact wheel to use.
3. Set the Tachometer to 0.1 m or 6 in setting for the contact wheel in use.
4. Use F to select units of measure.
5. Contact wheel to surface to measure and press
Oto take measurements.
6. When the Tachometer is triggered, the trigger symbol ashes and the
measurement is displayed.
MAX, MIN, AND AV READINGS
Press Mto enable MAX, MIN, and AV readings stored in memory. Each time a
new measurement is taken, the maximum, minimum, average, and last value are
stored. The last value is shown under MEM. The units of measure for the stored
readings will also be displayed. Press
O to exit the memory display mode.
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6
MAINTENANCE
Beyond replacing the batteries, do not attempt to repair or service the Product
unless you are qualied to do so and have relevant calibration, performance test,
and service instructions. The recommended calibration cycle is 12 months.
Warning
To prevent possible electrical shock, re, or personal injury:
● Repair the Product before use if the battery leaks.
● Use only specied replacement parts.
● Have an approved technician repair the Product.
● Be sure that the battery polarity is correct to prevent battery
leakage.
REPLACING THE BATTERIES
Replace the batteries when the low battery symbol appears on the display.
1. Remove the battery cover on back of the Tachometer. See Figure 3.
2. Replace with 2 AA 1.5V IEC LR6 (Alkaline) batteries.
3. Replace the battery cover.
CLEANING
Periodically wipe the case with a damp cloth and mild detergent. Do not use
abrasives or solvents. Dirt or moisture in the terminals can affect readings.
SPECIFICATIONS
RPM
Range
Optical (non-contact) 1 RPM to 99999 RPM
Contact (Fluke 931) 1 RPM to 19999 RPM
Accuracy ±0.02 % of reading ±1 digit
Sensing Distance (optical) 500 mm (20 inches)
Battery Type 2x AA 1.5 V IEC LR6 (Alkaline)
Battery Life Fluke 930 approximately 35 hours
Fluke 931 approximately 40 hours
Operating Temperature 0 ºC to +50 ºC (32 ºF to 122 ºF)
Storage Temperature -20 ºC to +70 ºC (0 ºF to 160 ºF)
Operating Humidity 10 %-90 % RH (non-condensing)
Operating Altitude 2000 m
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7
Weight 250 g (0.55 lbs)
Size 175 x 60 x 28 mm (7 x 2.5 x 1 inch)
Electromagnetic compatibility (EMC)
International IEC 61326-1:Portable; CISPR 11:Group 1,
Class A.
Group1: Equipment has intentionally generated and/or uses conductively-
coupled radio frequency energy that is necessary for the internal function of
the equipment itself.
Class A: Equipment is suitable for use in all establishments other than
domestic and those directly connected to a low voltage power supply network
which supplies bulidings used for domestic purposes.
Korea (KCC) Class A Equipment (Industrial Broadcasting &
Communication Equipment)
Class A: Equipment meets requirements for industrial electromagnetic wave
equipment and the seller or user should take notice of it. This equipment is
intended for use in business environments and not to be used in homes.
Note: Serial number of the Tachometer is located in battery compartment.
1
Handling
AC
B
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8
3
/ BATT
Max 500 mm
2
0
i
n
2
RPM
RPM
RPM
1.00 - 99999 rpm
0, 10 - 19999 rpm
RPM /
Fluke 931
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