Welch Allyn 901077 Directions For Use Manual

Welch Allyn Home™ Scale

Directions for use

901077 Weight scale, Software Version 1.0

© 2017 Welch Allyn. All rights are reserved. To support the intended use of the product described in this
publication, the purchaser of the product is permitted to copy this publication, for internal distribution
only, from the media provided byWelch Allyn. No other use, reproduction, or distribution of this
publication, or any part of it, is permitted without written permission from Welch Allyn.

Welch Allyn Home Scale is a trademark of Welch Allyn.

Welch Allyn assumes no responsibility for any injury to anyone, or for any illegal or improper use of the
product, that may result from failure to use this product in accordance with the instructions, cautions,
warnings, or statement of intended use published in this manual.

The Bluetooth® word mark and logos are registered trademarks owned by Bluetooth SIG, Inc. and any
use of such marks by Welch Allyn is under license.

Software in this product is © 2017 Welch Allyn or its vendors. All rights are reserved. The software is
protected by United States of America copyright laws and international treaty provisions applicable
worldwide. Under such laws, the licensee is entitled to use the copy of the software incorporated with
this instrument as intended in the operation of the product in which it is embedded. The software may
not be copied, decompiled, reverse-engineered, disassembled, or otherwise reduced to human­perceivable form. This is not a sale of the software or any copy of the software; all right, title, and
ownership of the software remain with Welch Allyn or its vendors.

For information about any Welch Allyn product, contact your local Welch Allyn representative:

www.welchallynhome.com/support.htm.

726196

DIR 80021989 Ver. B Revised 2017–02

Manufactured for Welch Allyn, Inc.

4341 State Street Road

Skaneateles Falls, NY 13153 USA

ww.welchallynhome.com

w

This manual applies to 901077 Weight scale.

Contents

Introductory information ........................................................................ 1

Use the scale ............................................................................................ 7

iii

Introduction .......................................................................................................... 1

Symbols ............................................................................................................... 1

About warnings and cautions ............................................................................... 3

Content list ........................................................................................................... 4

Controls and indicators ........................................................................................ 4

Screen elements .................................................................................................. 5

Startup ................................................................................................................. 7

Insert or replace the batteries .............................................................................. 7

Install the carpet feet ........................................................................................... 7

Pair a smartphone, a tablet, or a communication hub with the scale .................. 8

Select the measurement unit .............................................................................. 8

Ensure accurate measurements .......................................................................... 8

Obtain measurement ........................................................................................... 9

Stop a measurement ........................................................................................... 9

Maintain the scale ................................................................................................ 9

Troubleshooting .................................................................................................. 9

Appendices ............................................................................................ 13

Specifications ..................................................................................................... 13

General radio compliance ................................................................................... 14

Complied standards list ...................................................................................... 15

Emissions and immunity information ................................................................. 16

Warranty ............................................................................................................ 19

Approved accessories ........................................................................................ 20

iv Contents Welch Allyn Home™ Scale

Introductory information

Introduction

TM

The Welch Allyn Home
measure weight in a home environment.

This Directions for use contains important safety and care information and provides step
by step instructions for using the scale. Read the manual thoroughly before using the
scale.

Scale is intended for adults and children (10-17 years old) to

1

For information about any Welch Allyn product, contact Welch Allyn Home technical
support at www.welchallynhome.com/support.htm.

Indications for use

The Welch Allyn Home Scale is intended for adults and children (10–17 years old) to
measure weight in the home.

Contraindications

This device is contraindicated for any person who is connected to a wearable or
implantable electronic device or instrument, such as a pacemaker or defibrillator.

Symbols

Documentation symbols

Warning: The warning statements in this manual identify conditions or practices that could lead to
illness, injury, or death. Warning symbols will appear with a grey background in a black and white
document.

Caution: The caution statements in this manual identify conditions or practices that could result in
damage to the equipment or other property, or loss of data.

Mandatory - Consult Directions for Use

2 Introductory information Welch Allyn Home™ Scale

Power symbols

Direct current (DC)

Shipping, storing, and environment symbols

Humidity limitation Separate collection of

Electrical and Electronic
Equipment. Do not
dispose as unsorted
municipal waste.

Temperature limit Atmospheric pressure

limitation

Recycle Stacking limit by number

Connectivity symbols

Bluetooth® wireless technology enabled

Miscellaneous symbols

Serial number

Product identifier, product family catalogue number Non-ionizing electromagnetic

Reorder number, Model number Global Trade Item Number

IP22

The ingress protection: the device could protected against
solid foreign objects of 12.5mm and greater, and against
vertically falling water drops when ENCLOSURE tilted up
to 15°

Manufacturer

radiation

Type BF applied parts

Directions for use Introductory information 3

About warnings and cautions

Caution statements can appear on the Welch Allyn Home Scale device, packaging,
shipping container, or in this Directions for use.

The Welch Allyn Home Scale is safe for users when used in accordance with the
instructions and caution statements presented in this Directions for use.

Before using the device, you must familiarize yourself with all cautions, with the steps to
power up the device, and with the sections of this Directions for use that pertain to your
use of the device. In addition to reviewing the general cautions presented in the next
section, you must also review the more specific cautions that appear throughout the
manual in conjunction with setup/startup, operation, and maintenance tasks.

• Failure to understand and observe any warning statement in this manual could lead
to injury or illness.

• Failure to understand and observe any caution statement in this manual could lead to
damage to the equipment or other property, or loss of data.

General warnings and cautions

Warning Injury risk. Do not use the scale on a slippery floor, such as tile.

Warning Injury risk. Do not jump onto the platform immediately after

bathing or with wet hands.

Warning Injury risk. Dispose of accessories, detachable parts, and the
device according to the local guidelines.

Warning Injury risk. No modification of this equipment is allowed.
Modifying the equipment could damage the device or cause injury.

Warning Injury risk. Do not touch output of the batteries and the user
simultaneously.

Warning Injury risk. Before use, make sure the device functions safely and
is in proper working condition. Failure to do so could damage the device or
cause injury.

Warning Possible injury risk. The device contains small parts. Keep the
device away from children and pets.

CAUTION Avoid storing the device where the device may be exposed to
extreme temperatures, humidity, moisture, direct sunlight, dust, or salt air.

CAUTION Avoid storing the device where there is risk of shock or
dropping.

CAUTION Avoid storing the device where you store chemicals.

CAUTION Avoid storing the device where there are corrosive gases.

CAUTION Avoid storing the device near infants or children.

4 Introductory information Welch Allyn Home™ Scale

CAUTION Do not attempt to repair the unit yourself in the event of
malfunctions. Only have repairs carried out by authorized service centers.

CAUTION Do not use rechargeable batteries.

CAUTION Use the scale in the environment described in this Directions

for use. Using the scale in other environments will compromise the
performance of the scale and reduce the lifetime of the scale.

Content list

The following items are in the device box:

• Home Scale

• (4) AAA alkaline batteries (1.5V each)

• (4) extension feet for use on carpet

• Directions for use

Controls and indicators

Scale top

The Welch Allyn Home scale is simple to use.

Feature Description

No.

1 LCD display Displays measurement

Directions for use Introductory information 5

No. Feature Description

2 UNIT / Power button The button enables you to select kg or lb unit measure. Press and

hold for 3 seconds to enter pairing mode.

3 Battery compartment (behind cover) Houses (4) AAA alkaline batteries (1.5V each)

4 Sensors (4) 4 load cell sensors which conduct weight measurement

Screen elements

The liquid crystal display (LCD) display registers the measurement. The display also may
show other icons that provide information about the functionality of the scale.

Icon Description Icon Description

kg

Kilogram

Low battery charge Full battery charge

Bluetooth wireless
technology is powered on

Data being transferred
using Bluetooth wireless
technology (dotted area
flashes)

lb

Pound

Bluetooth wireless technology
connected (dotted area is not
flashing)

Scale not paired with device

6 Introductory information Welch Allyn Home™ Scale

Use the scale

Startup

The Welch Allyn Home scale uses SENSE ON™ technology to turn on the scale. Step on
the scale with bare feet to begin a measurement.

Insert or replace the batteries

7

CAUTION When the symbol appears, the device will power off
in four seconds. Replace the old batteries with a new set of four batteries.
Always replace all four batteries with new batteries. Do NOT mix old
batteries with new batteries.

CAUTION Remove the batteries if the device is not to be used for some
time.

CAUTION Dispose old batteries by following your local recycling
guidelines.

CAUTION Do not burn batteries. Batteries may leak or explode.

1. Open the battery door on the under side of the scale.

2. Insert the four AAA alkaline batteries (1.5V each) into the battery compartment
according to the polarity indications marked inside the battery compartment.

3. Close the battery door.

4. Wait until the digits “0.0lb”appear on the LCD screen.

Install the carpet feet

Install the carpet feet if you use the device on carpet to avoid the device slipping.

Peel off and removethe rubber stickers on the four corner posts.

1.

2. Remove the four carpet feet from the packaging.

3. Insert the carpet feet prongs into the posts.

8 Use the scale Welch Allyn Home™ Scale

Pair a smartphone, a tablet, or a communication hub with the scale

Advanced Bluetooth 4.0 technology enables your smartphone, tablet, or a
communication hub to receive your personal health information from your device. You
have two alternatives to pair your device with these devices.

• If you are using the Welch Allyn Home application, follow the pairing instructions
presented in the application.

• Contact your Remote Monitoring Solution provider or use the instructions that office
provided to set up these communications devices.

With either alternative, you complete the same steps on the Home scale.

1. Confirm that both the smart device and the Home scale are powered on.

Note Bluetooth wireless connectivity is only available for devices

which support Bluetooth 4.0 technology.

2. Press and hold the Unit / Power button on the bottom of the scale for 3 seconds.

The Bluetooth pairing sequence is activated. The dotted line surrounding the
Bluetooth symbol flashes while discovering the weight scale.

If successful, a steady

LCD screen. If unsuccessful, the

symbol surrounded by a dotted line appears on the scale's

appears.

Select the measurement unit

The default measurement unit is pound (lb).

Press the Unit / Power button on the bottom of the scale to change from pound (lb)
to kilogram (kg).

Ensure accurate measurements

To ensure the accuracy of measurements, follow the recommendations below when you
start a measurement.

•

Place the scale on a flat, hard surface for at least 10 seconds. Obtaining the
measurement immediately after placing the scale on a flat, hard surface may affect
the accuracy of the measurement.

• If you place the scale on carpet, fit the extension feet before taking the
measurement. Placing the scale sensors directly on carpet may affect the accuracy
of the measurement.

• Always start a measurement at the same time on the same scale located on the
same flat surface.

Directions for use

Obtain measurement

With the original SENSE ON patent technology, the scale automatically powers on when
you step on the platform in your bare feet.

1. Step on the platform in your bare feet.

The scale automatically powers on and begins the measurement.

2. Stand still and keep full contact with the scale until the LCD stops blinking and
displays the weight.

Stop a measurement

You can stop a measurement before it is complete.

Step off the platform.

The scale returns to a ready / zero state.

After approximately 2 seconds, the scale powers down automatically.

Use the scale 9

Maintain the scale

Warning Injury risk. Keep the device clean. Contact with a contaminated
device can spread infection. Clean the device after each use.

Note The Home scale does not require calibration.

To get the best performance from your Home scale, follow the maintenance steps
below.

•

Store the device in a dry place away from direct sunlight.

• Avoid shaking and dropping the device

• Avoid operating the device in dusty and unstable temperature environments.

CAUTION Use a soft cloth to clean the entire device. Do not use any
abrasive or volatile cleaners.

The following agents are compatible with the device:

•

70 percent isopropyl alcohol

• 10 percent chlorine bleach/90 percent water solution

1. Clean the Home scale only when necessary with one of the compatible cleaning
agents listed above.

2. If necessary, wipe the device with a soft, damp cloth.

Troubleshooting

This section includes a list of error messages and frequently asked questions for
problems you may encounter with your Home scale. If the device is not operating as you
think it should, check here before arranging for servicing.

10 Use the scale Welch Allyn Home™ Scale

Error prompt

Error Description Solution

Dotted lines Overload. The device will power off Weight exceeds scale maximum

Low Battery. The device will power off
in four seconds.

Error condition At any point, when a situation occurs

that prevents a successful test
acquisition, an error code will be
displayed in the LCD area. The
message will persist for several
seconds until the device times out and
powers down.

E02 Movement while weighing Remain motionless while weighing

Weight fluctuates Placement on scale is improper Place scale on hard ground, then weigh

Moved scale Place scale on hard ground, then weigh

Cannot power on scale Batteries inserted improperly Move scale and insert batteries.

Scale halted Electrostatic interference Move scale and insert batteries.

Replace all four batteries at the same
time. Purchase the authorized batteries
for replacement.

Check the following items:

• Bluetooth wireless technology is
on.

• The application is on.

• Both devices are within the
transmission distance of
Bluetooth devices.

again after returning scale to 0.0 kg.

again after returning scale to 0.0 kg.

Reboot the scale and weigh again.

Reboot the scale and weigh again.

When measuring

Problem

No display on the LCD screen or display
flickers with the scale powers on

The scale powers off automatically

"Bat" symbol appears for 3 seconds
then the scale powers off

Measurement fluctuates by several
pounds from last measurement

Root cause Solution

Batteries are not installed or not
installed properly

Worn batteries Replace all four batteries at the same

Low Battery.

No batteries Replace all four batteries at the same

Scale was not placed on a hard, flat
surface for at least 10 seconds before
obtaining measurement

Install the batteries. Go to "Insert or
replace the batteries"

time. Purchase the authorized batteries
for replacement.

Replace all four batteries at the same
time. Purchase the authorized batteries
for replacement.

time. Purchase the authorized batteries
for replacement.

Place the scale on a hard, flat surface
for at least 10 seconds before stepping

Directions for use Use the scale 11

Problem Root cause Solution

onto the scale to begin the
measurement

When transmitting data

Problem Root cause Solution

Data transmission failed Bluetooth wireless technology is off Turn on the Bluetooth wireless

technology via the Settings.

Application is off

Out of range of Bluetooth transmission. Place your mobile or portable device

Press the icon to run your application.

closer to the scale.

12 Use the scale Welch Allyn Home™ Scale

Appendices

Specifications

13

Warning

: No modification of this equipment is allowed.

Item Specification

Power supply

Display mode Blue LCD with White Backlight V.A.: 74x53mm

Measurement unit Kilogram / Pound

Measurement range

Resolution

Normal working condition Temperature: 5℃ (41°F) to 40℃

Storage & transportation
condition

6V 4*AAA alkaline batteries

5kg to 200kg / 11lb to 441lb

The measurement resolution
shall be:

0–100kg: 0.1kg

100–200kg: 0.2kg

(104°F)

Atmospheric pressure: 86kPa to 106kPa

Temperature:-20℃ (-4°F) to 60℃
(140°F)

0–220 lb: 0.2lb

220–440lb: 0.5lb

Humidity: ≤ 85%RH

Relative Humidity: 10% RH–93% RH

Atmospheric Pressure: 50kPa to 106 kPa

Net Weight Approximately 2.75kg (6.1 lb.) ( Excluding the dry cells)

Dimensions 360mm x 408mm x 32.5mm (14.2inches x16.1inches x 1.3inches) with carpet feet

Accessories

Mode of operation Continuous operation

• (4) AAA alkaline batteries

• (4) extension feet

• Directions for use

14

Appendices Welch Allyn Home™ Scale

Item Specification

Auto-ON SENSE ON technology

Auto-OFF About 15 seconds when showing 0.0

About 15 seconds after the weight data is locked

Degree of protection Type BF applied part

Protection against ingress of
water

Software Version Version 1.0

IP22

General radio compliance

Item Specification

Bluetooth Module No. AW51822

RF Frequency Range 2402 MHz to 2480 MHz

Output Power 4.0 dBm

Supply Voltage 1.8-3.6 V

Antenna Gain 0dBi

Transmitting Distance 10 meters, (30 feet)

Federal Communication Commission (FCC) Interference Statement

This device complies with part 15 of the FCC Rules. Operation is subject to the following
two conditions.

•This device may not cause harmful interference.

•This device must accept any interference received, including interference that may
cause undesired operation.

This equipment (FCC ID: OU9BS-1507) has been tested and found to comply with the
limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are
designed to provide reasonable protection against harmful interference in a residential
installation. This equipment generates, uses, and can radiate radio frequency energy and,
if not installed and used in accordance with the instructions, may cause harmful
interference to radio communications. However, there is no guarantee that interference
will not occur in a particular installation. If this equipment does cause harmful
interference to radio or television reception, which can be determined by turning the
equipment off and on, the user is encouraged to try to correct the interference by one of
the following measures.

1.Reorient or relocate the receiving antenna.

2.Increase the separation between the equipment and receiver.

Directions for use Appendices 15

3.Consult the dealer or an experienced radio/TV technician for help.

Any changes or modifications not expressly approved by the party responsible for
compliance could void the user's authority to operate this equipment.

FCC Radiation Exposure Statement

This equipment complies with FCC radiation exposure limits set forth for an uncontrolled
environment. This transmitter must not be co-located or operating in conjunction with
any other antenna or transmitter.

Industry Canada (IC) compliance

This device complies with Industry Canada licence-exempt RSS standard(s). Operation is
subject to the following two conditions: (1) this device may not cause interference, and
(2) this device must accept any interference, including interference that may cause
undesired operation of the device.

Cet appareil est conforme aux normes RSS exemptes de licence de l'Industry Canada.
Son fonctionnement est soumis aux deux conditions suivantes : (1) l'appareil ne doit pas
produire de brouillage, et (2) l'appareil doit accepter tout brouillage radioélectrique subi,
même si le brouillage est susceptible d'en compromettre le fonctionnement.

This radio transmitter (IC: 12725A-BS1507) has been approved by Industry Canada to
operate with the antenna listed in the specification table.

Ce transmetteur de radio (C: 12725A-BS1507) a été approuvé par l'Industry Canada pour
fonctionner avec l'antenne répertoriée dans la table des spécifications.

This Class B digital apparatus complies with Canadian ICES-003.

Cet appareil numérique de la classe B est conforme à la norme NMB-003 du Canada.

Complied standards list

Item Standard

Risk management ISO/EN 14971 Medical devices — Application of risk

Labeling ISO/EN 15223-1 Medical devices. Symbols to be used with

User manual EN 1041 Medical equipment manufacturers to provide

General Requirements for Safety

management to medical devices

medical device labels, labeling and information to be
supplied. General requirements

Tested in accordance with ISO 10993 Biocompatibility

information

IEC 60601-1+A1 Medical electrical equipment - Part 1:
General requirements for basic safety and essential
performance

IEC 60601-1-11 Medical electrical equipment - Part 1-11:
General requirements for basic safety and essential
performance - Collateral standard: Requirements for

16 Appendices Welch Allyn Home™ Scale

Item Standard

medical electrical equipment and medical electrical
systems used in the home healthcare environment

Electromagnetic compatibility IEC/EN 60601-1-2 Medical electrical equipment - Part 1-2:

General requirements for basic safety and essential
performance - Collateral standard: Electromagnetic
compatibility - Requirements and tests

Software life-cycle processes

Usability

IEC/EN 62304+AC Medical device software - Software life
cycle processes

IEC 62366 Medical devices - Application of usability
engineering to medical devices (IEC 62366)

IEC 60601-1-6 Medical electrical equipment - Part 1 -6 :
General requirements for basic safety and essential
performance - collateral standard : Usability

Emissions and immunity information

The Welch Allyn Home Scale RPM-SCALE100 is intended for use in the electromagnetic
environment specified below. The customer or user of the Welch Allyn Home Scale
should assure that it is used in such an environment.

This equipment needs to be installed and put into service in accordance with the
information provided in the user manual.

CAUTION Wireless communications equipment, such as wireless home
network devices, mobile phones, cordless telephones and their base
stations, walkie-talkie can affect this equipment and should be kept at least
a distance d=3,3m away from the equipment.

Note As indicated in Table 6 of IEC 60601-1-2:2007 for ME Equipment, a typical

cell phone with a maximum output power of 2 W yields d=3,3m at an
IMMUNITY LEVEL of 3V/m).

Electromagnetic emissions

The Welch Allyn Home Scale is intended for use in the electromagnetic environment specified below. The customer or
user of the Welch Allyn Home Scale should assure that it is used in such an environment.

Emissions test Compliance Electromagnetic environment - guidance

RF emissions
CISPR 11

RF emissions
CISPR 11

Harmonic emissions
IEC 61000-3-2

Group 1 The Welch Allyn Home Scale uses RF energy only for its internal

function. Therefore, its RF emissions are very low and are not likely to
cause any interference in nearby electronic equipment.

Class B

Not applicable

The Welch Allyn Home Scale is suitable for use in all establishments
other than domestic establishments and those directly connected to the
public low-voltage power supply network that supplies buildings used
for domestic purposes.

Directions for use Appendices 17

Electromagnetic emissions

Voltage fluctuations/

Not applicable

flicker emissions
IEC 61000-3-3

Electromagnetic immunity

The Welch Allyn Home Scale is intended for use in the electromagnetic environment specified below. The customer or
the user of the Welch Allyn Home Scale should assure that it is used in such an environment.

Immunity test IEC 60601 test level Compliance level Electromagnetic environment - guidance

Electrostatic discharge
(ESD)

IEC 61000-4-2

Electrical fast
transient/burst

IEC 61000-4-4

Surge
IEC 61000-4-5

Voltage dips, short
interruptions and
voltage variations on
power supply input
lines

IEC 61000-4-11

±6 kV contact
± 8 kV air

±2 kV for power supply
lines

± 6 kV contact
± 8 kV air

±2 kV for power supply
lines

± 1 kV line(s) to line(s) ± 1 kV differential

mode

<5% U

T

(>95% dip in UT) for 0.5
cycle

40% U

T

(60% dip in UT) for 5
cycles

<5% U

T

(>95% dip in UT) for 0.5
cycle

40% U

T

(60% dip in UT)for 5
cycles

Floors should be wood, concrete or ceramic
tile. If floors are covered with synthetic
material, the relative humidity should be at
least 30%.

Mains power quality should be that of a typical
commercial or hospital environment.

Mains power quality should be that of a typical
commercial or hospital environment.

Mains power quality should be that of a typical
commercial or hospital environment. If the user
of the Welch Allyn Home Scale requires
continued operation during power mains
interruptions, it is recommended that the
Welch Allyn Home Scale be powered from an
uninterruptible power supply or a battery.

Power frequency
(50Hz) magnetic field
IEC 61000-4-8

70% U

T

(30% dip in UT) for 25
cycles

<5% U

T

(>95% dip in UT) for 5
seconds

3A/m 3A/m Power frequency magnetic fields should be at

70% U

T

(30% dip in UT) for 25
cycles

<5% U

T

(>95% dip in UT) for 5
seconds

levels characteristic of a typical location in a
typical commercial or hospital environment.

Note: UT is the AC mains voltage prior to application of the test level.

Electromagnetic immunity

The Welch Allyn Home Scale is intended for use in the electromagnetic environment specified below. The customer or
the user of the Welch Allyn Home Scale should assure that it is used in such an environment.

18 Appendices Welch Allyn Home™ Scale

Electromagnetic immunity

Immunity test IEC 60601 test level Compliance level Electromagnetic environment - guidance

Portable and mobile RF communications
equipment should be used no closer to any part
of the Welch Allyn Home Scale, including
cables, than the recommended separation
distance calculated from the equation
applicable to the frequency of the transmitter.

Recommended separation distance

Conducted RF
IEC 61000-4-6

Radiated RF

3 Vrms

3 Vrms

150 kHz to 80 MHz

3 V/m 80 MHz to 1 GHz 3 V/m

d= (1.167)

d= (1.167) 80 to 800 MHz

IEC 61000-4-3

d= (2.333) 800 MHz to 2,5 GHz

whereP is the maximum output power rating of
the transmitter in watts (W) andd is the
recommended separation distance in meters
(m). Field strengths from fixed RF transmitters,
as determined by an electromagnetic site

surveya, should be less than the compliance
level in each frequency rangeb. Interference

may occur in the vicinity of equipment marked
with the following symbol:

Note1: At 80 MHz and 800 MHz, the higher frequency range applies.
Note 2: These guidelines may not apply in all situations. Electromagnetic propagation is affected by absorption and

reflection from structures, objects, and people.

a

Field strengths from fixed transmitters, such as base stations for radio (cellular/cordless) telephones and land mobile
radios, amateur radio, AM and FM radio broadcast, and TV broadcast cannot be predicted theoretically with accuracy. To
assess the electromagnetic environment due to fixed RF transmitters, an electromagnetic site survey should be
considered. If the measured field strength in the location in which the Welch Allyn Home Scale is used exceeds the
applicable RF compliance level above, the Welch Allyn Home Scale should be observed to verify normal operation. If
abnormal performance is observed, additional measures may be necessary, such as reorienting or relocating the Welch
Allyn Home Scale.

b

Over the frequency range 150 kHz to 80 MHz, field strengths should be less than 3 V/m.

Recommended separation distances between portable and mobile RF communications
equipment and the Welch Allyn Home Scale

The Welch Allyn Home Scale is intended for use in an electromagnetic environment in which radiated RF disturbances
are controlled. The customer or user of the Welch Allyn Home Scale can help prevent electromagnetic interference by
maintaining a minimum distance between portable and mobile RF communications equipment (transmitters) and the
Welch Allyn Home Scale as recommended below, according to the maximum output power of the communications
equipment.

Directions for use

Appendices 19

Recommended separation distances between portable and mobile RF communications
equipment and the Welch Allyn Home Scale

Separation distance according to frequency of transmitter (m)

Warranty

Rated max. output
power of transmitter
(W)

0.01 0.167 0.167 0.233

0.1 0.369 0.369 0.738

1 1.167 1.167 2.333

10 3.690 3.690 7.338

100 11.67 11.67 23.33

For transmitters rated at a maximum output power not listed above, the recommended separation distanced in meters
(m) can be estimated using the equation applicable to the frequency of the transmitter, where P is the maximum output
power rating of the transmitter in watts (W) according to the transmitter manufacturer.

Note 1: At 80 MHz and 800 MHz, the separation distance for the higher frequency range applies.

Note 2: These guidelines may not apply in all situations. Electromagnetic propagation is affected by absorption and
reflection from structures, objects, and people.

150 kHz to 80 MHz

d= (1.167)

80 MHz to 800 MHz

d= (1.167)

800 MHz to 2.5 GHz

d= (2.333)

Welch Allyn will warranty the Home Scale to be free of defects in material and
workmanship and to perform in accordance with manufacturer specifications for the
period of two years from the date of retail purchase.

The warranty period shall start on the date of purchase. The date of purchase is: 1) the
invoiced ship date if the device was purchased directly from Welch Allyn, 2) the date
specified during product registration, 3) the date of purchase of the product from a
Welch Allyn authorized distributor as documented from a receipt from said distributor.

This warranty does NOT cover damages caused by misuse or abuse, including but not
limited to:

•

Failure caused by unauthorized repairs or modifications

• Damage caused by shock or dropping during transportation

• Damage caused by improper use of the power supply

• Failure caused by improper operation not consistent with the instructions stated in

this Directions for use

Should this device require maintenance (or replacement at our option) under warranty,
please deliver the original package to Welch Allyn prepaid. Please return the store receipt
(with the retail purchase date) and a note with the reasons for the return.

20 Appendices Welch Allyn Home™ Scale

Approved accessories

Item Description

RPM-SCALEACC-01 Carpet Feet 40EA