Model 940 Service Guide Rev 0

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SERVICE GUIDE

Service Guide • Aaron 940

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This Service Guide and the equipment it describes are for qualified technicians who maintain and repair the Aaron 940 High

Frequency Desiccator. Additional User information is available in the Aaron 940 User’s Guide.

This document covers technical descriptions of the Aaron 940 including its physical appearance, all operator controls and

indications, operational specifications, component functional descriptions (module level), diagrams of the electronic circuits used,

and troubleshooting guidelines (with chart comparisons).

The Aaron 940 was constructed with the highest quality components. In the unlikely event that your generator fails within two years

of purchase date, Bovie Medical will warranty the product and effect factory repairs. Please refer to Appendix A, Warranty for what

is covered, length of coverage, and “How to Receive a Return Authorization Number.”

Equipment Covered in this Manual

Aaron 940:

Reference No.: A940

For Information Contact

Bovie Medical • 5115 Ulmerton Road, Clearwater, FL 33760 USA

U.S. Phone 1-800-537-2790 Fax 1-800-323-1640 • International Phone +1-727-384-2323 Fax +1-727-347-9144

www.boviemedical.com • info@boviemedical.com

Peter J. Smith Medical Products Marketing

18 Yeates Close

Thame OX9 3AR, UK

Made in USA

Printed in USA

©2009 Bovie Medical. All rights reserved. Contents of this publication may not be reproduced without the written permission of

Bovie Medical.

Bovie Part Number MC-55-190-001 Rev. 0

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SAFETY PRECAUTIONS WHEN OPERATING THE GENERATOR

The safe and effective use of electrosurgery depends to a large degree on factors solely under the control of the operator. There is no

substitute for a properly trained and vigilant medical staff. It is important that they read, understand, and follow the operating

instructions supplied with this electrosurgical equipment.

To promote the safe use of the Aaron 940, please refer to the User’s Guide for standard operating precautions.

APPLICABLE SAFETY STANDARDS

CAN/CSA C22.2, NO. 601.1 - M90

UL 60601-1 (Ed. 1 Rev. 2006) Part 1

IEC 60601 - 2 - 2 (Ed. 4 Rev. 2006) Part 2-2

IEC 60601 - 1 - 2 (Ed. 4 Rev. 2001) Part 1-2

IEC 60601 - 1 (Ed. 2 Rev. 1998) Part 1

CENELEC EN 60601 - 1 (Issue 1990) Part 1

CONVENTIONS USED IN THIS GUIDE

WARNING:

Indicates a potentially hazardous situation which, if not avoided, could result in death or serious

injury.

CAUTION:

Indicates a hazardous situation which, if not avoided, may result in minor or moderate injury.

NOTICE:

Indicates an operating tip, a maintenance suggestion, or a hazard that may result in product

damage.

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Operating the Aaron 940 ......................................................................................................5-1

Inspecting the Generator and Accessories .....................................................................5-2

Service Personnel Safety................................................................................................5-2

Installation .......................................................................................................................5-3

Functional Checks...........................................................................................................5-3

Unit Operations ...............................................................................................................5-5

Maintenance...........................................................................................................................6-1

Cleaning ..........................................................................................................................6-2

Periodic Inspection..........................................................................................................6-2

Fuse Replacement ..........................................................................................................6-2

Troubleshooting ....................................................................................................................7-1

Recommended Equipment..............................................................................................7-2

Troubleshooting the Aaron 940 .......................................................................................7-4

Inspecting the Unit...................................................................................................7-2

Inspecting the Receptacles .....................................................................................7-2

Inspecting Internal Components..............................................................................7-4

Understanding Error Codes and Audio Tones.................................................................7-4

Correcting Common Problems........................................................................................7-5

Main Board Test Points ...................................................................................................7-8

Return Policy and Procedures.............................................................................................8-1

Responsibility of Manufacturer........................................................................................8-2

Returning the Unit for Service.........................................................................................8-2

Warranty ................................................................................................................................A-1

Board Drawings, Schematics, & Assemblies ....................................................................B-1

How to Order Parts from Bovie Medical .........................................................................B-2

Aaron 940 Design Breakdown and Drawing Reference.................................................B-2

Bovie Drawing and Schematic Package.........................................................................B-3

Service Guide • Aaron 940

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LIST OF FIGURES

Figure 2 – 1

Figure 2 – 2

Figure 2 – 3

Figure 2 – 4

Figure 3 – 1

Figure 3 – 2

Figure 3 – 3

Figure 3 – 4

Figure 3 – 5

Figure 4 – 1

Figure 5 – 1

Figure 5 – 2

Figure 6 – 1

Layout of controls, indicators, and receptacles on the front panel..................2-2

Controls for the cut, blend, and coag modes ..................................................2-4

Location of the front panel receptacles and power switch ..............................2-5

Layout of controls and labeling on the rear and side panels ..........................2-6

Output power versus power setting for all modes...........................................3-8

Output Power versus Load • Bipolar 100% / 50% ..........................................3-8

Bipolar Mode waveform ..................................................................................3-8

Output Power versus Load • Monopolar 100% / 50% ....................................3-9

Monopolar Mode waveform.............................................................................3-9

Functional block diagram of the Aaron 940 system ........................................4-2

Installation and placement...............................................................................5-3

Unit setup ........................................................................................................5-4

Fuse.................................................................................................................6-2

SCHEMATICS AND BOARD DRAWINGS

Main Board..............................................................................................................................B-3

Logic Center............................................................................................................................B-4

RF Amplifier Circuit .................................................................................................................B-5

Request Activation Sense Circuit (Hand and Foot) ................................................................B-6

Power Supply..........................................................................................................................B-7

Request Up Sense Circuit ......................................................................................................B-8

Request Down Sense Circuit..................................................................................................B-9

Power Factor Corrector Power Supply .................................................................................B-10

Power Factor Corrector Power Supply - High Voltage PFC.................................................B-11

Power Factor Corrector Power Supply - Mains Filter ...........................................................B-12

Power Factor Corrector Power Supply - Low Power SMPS ................................................B-13

Printed Circuit Board Main....................................................................................................B-14

Printed Circuit Board PFC ....................................................................................................B-15

A940 Assembly .....................................................................................................................B-16

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THE AARON 940

HIGH FREQUENCY DESICCATOR

This section includes the following information:

● Functional Description

● Unit Description

● Safety Precautions When Repairing the Generator

● General Warnings, Cautions, and Notices

● Active Accessories

● Fire/Explosion Hazards

● Generator Electric Shock Hazards

● Servicing

● Cleaning

CAUTION

Read all warnings, cautions, and instructions provided with this generator before using.

Read the instructions, warnings, and cautions provided with electrosurgical accessories before

using. Specific instructions are not included in this manual.

Service Guide • Aaron 940

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FUNCTIONAL DESCRIPTION

The Aaron 940 is a multipurpose High Frequency Desiccator for use in physician’s offices and surgi-centers. It provides unsurpassed performance, flexibility, reliability, and user convenience in one compact package.

The Aaron 940 High Frequency Desiccator includes digital technology. This new technology is evident in the selfchecking circuitry and error code readouts. The unit offers monopolar and bipolar electrosurgical operations.

The following are Aaron 940 key advantages and benefits.

Power Capabilities

Memory

Self Diagnostics

Up to 40 watts of Coagulation @ 1000 Ω.

Up to 40 watts of Bipolar @ 200 Ω.

The generator automatically powers up to the last

power setting.

These diagnostics continually monitor the unit to ensure

proper performance.

Whenever they detect a problem, medical personnel

receive audible and visual alarm responses, and the output

is suspended until the alarm condition is cleared.

UNIT DESCRIPTION

The Aaron 940 High Frequency Desiccator is a self-contained unit, consisting of the main enclosure and power cord.

The main components incorporated in the generator include:

• FRONT PANEL COMPONENTS Dial for controlling power output; receptacles for connecting

electrosurgical accessories; footswitch receptacle; and 7-segment display.

• REAR PANEL COMPONENTS Volume control.

• OTHER COMPONENTS Power switch (located on side of unit); power cable receptacle

(located on bottom of unit); connector to A901 pencil.

• INTERNAL COMPONENTS Main PCB and Power Factor Corrector PCB.

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SAFETY PRECAUTIONS WHEN REPAIRING THE GENERATOR

Before servicing the Aaron 940 High Frequency Desiccator it is important that you read, understand, and follow the

instructions supplied with it. Also, be familiar with any other equipment used to install, test, adjust, or repair this

generator.

General Warnings, Cautions, and Notices

WARNING

The instrument receptacles on this generator are designed to accept only one instrument at a

time. Do not attempt to connect more than one instrument at a time into a given receptacle.

Doing so will cause simultaneous activation of the instruments.

CAUTIONS

Do not stack equipment on top of the generator or place the generator on top of electrical

equipment. These configurations are unstable and/or do not allow adequate cooling. Unit is

designed to be wall mounted or mounted on a mobile stand.

Provide as much distance as possible between the electrosurgical generator and other electronic

equipment (such as monitors). An activated electrosurgical generator may cause electrical

interference with them.

Do not turn the activation tone down to an inaudible level. The activation tone alerts the surgical

team when an accessory is active.

NOTICES

Connect the power cord to a wall receptacle having the correct voltage. Otherwise, product

damage may result.

Active Accessories

WARNINGS

Shock Hazard – Do not connect wet accessories to the generator.

Shock Hazard – Ensure that all accessories and adapters are correctly connected and that no

metal is exposed.

CAUTIONS

Accessories must be connected to the proper receptacle type. In particular, bipolar accessories

must be connected to the Bipolar Instrument receptacle only. Improper connection may result in

inadvertent generator activation.

Set power levels to the lowest setting before testing an accessory.

NOTICES

To avoid incompatibility and unsafe operation, we recommend using only Aaron accessories.

During bipolar electrosurgery, do not activate the generator until the forceps have made contact

with the patient. Product damage may occur.

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Fire / Explosion Hazards

WARNINGS

Explosion Hazard – Do not install the generator in the presence of flammable anesthetics, gases,

liquids, or objects.

Fire Hazard – Do not place active accessories near or in contact with flammable materials (such

as gauze or surgical drapes). Electrosurgical accessories that are activated or hot from use can

cause a fire. Use a holster to hold electrosurgical accessories safely away from personnel and

flammable materials.

Fire Hazard – Do not use extension cords.

Fire Hazard – For continued protection against fire hazard, replace fuses only with fuses of the

same type and rating as the original fuse.

Generator Electric Shock Hazards

WARNINGS

Connect the generator power cord to a properly grounded receptacle. Do not use power plug

adapters.

Do not connect a wet power cord to the generator or to the wall receptacle.

To allow stored energy to dissipate after power is disconnected (caps discharge) wait at least five

minutes before replacing parts.

Always turn off and unplug the generator before cleaning.

Do not touch any exposed wiring or conductive surfaces while the generator is disassembled and

energized. Never wear a grounding strap when working on an energized generator.

When taking troubleshooting measurements use appropriate precautions such as using isolated

tools and equipment, using the “one hand rule,” etc.

Potentially lethal AC and DC voltages are present in the AC line circuitry, high voltage DC circuitry,

and associated mounting and heat sink hardware described in this manual. These potentials are

not isolated from the AC line. Take appropriate precautions when testing and troubleshooting this

area of the generator.

High frequency, high voltage signals that can cause severe burns are present in the RF output

stage and in the associated mounting and heat sink hardware. Take appropriate precautions when

testing and troubleshooting this area of the generator.

Servicing

CAUTIONS

Read all warnings, cautions, and instructions provided with this generator before servicing.

The generator contains electrostatic-sensitive components. When repairing the generator, work at

a static-control workstation. Wear a grounding strap when handling electrostatic-sensitive components, except when working on an energized generator. Handle circuit boards by their nonconductive edges. Use an anti-static container for transport of electrostatic-sensitive components and circuit boards.

Cleaning

NOTICE

Do not clean the generator with abrasive cleaning or disinfectant compounds, solvents, or other

materials that could scratch the panels or damage the generator.

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CONTROLS, INDICATORS, AND RECEPTACLES

This section describes the front, rear, and side panels, including all controls, indicators, receptacles, and ports.

Service Guide • Aaron 940

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FRONT PANEL

Figure 2 – 1 Layout of controls, indicators, and receptacles on the front panel

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CONTROLS AND INDICATORS OVERVIEW

Users may control most Aaron 940 functions from the front panel. Each Control is plainly marked on the

front panel for quick reference. The volume control is located on the rear panel.

Normal operations involve activating the generator with either a front connected handswitch or footswitch.

The following components are the User Interface for the Aaron 940 High Frequency Desiccator:

Power Switch

The rocker ON/OFF switch on the lower right corner.

The switch turns power on and off to the unit.

Power Control Knob

This rotary knob allows you to select the desired

RF power level for all modes of operation. The Power

Control Knob moves at a graduated .1 watt per notch

(incrementally) up to 10 watts and 1 watt per notch up

from 10 to 40 watts.

Watts Display

The large power output display reports the generator’s

output power setting from .1 to 40 watts.

Visual LED Indictors

The blue activation indicator reports when the unit

is activated.

Audible Indicators

An activation tone sounds whenever the Aaron 940 High

Frequency Desiccator is activated. The volume may be

adjusted to a high or low setting. The volume adjustment

is located on the rear of the unit.

An alarm siren sounds during all alarm conditions.

The volume of this alarm cannot be adjusted.

Service Guide • Aaron 940

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COAGULATION AND BIPOLAR CONTROLS

Figure 2 – 2 Controls for the cut, blend, and coag modes

Coag and Bipolar

Power Display (watts)

Indicates the power set for

Coag or Bipolar.

Coag and Bipolar

Activation Indicator

Illuminates when you

activate Coag or

Bipolar.

Active

Power Control

Coag and Bipolar Power Control Dial

Increases or decreases the Coag or Bipolar

power output.

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ACCESSORY RECEPTACLES

Figure 2 – 3 Location of the front panel receptacles and power switch

Power Switch

Powers the unit

on or off.

Monopolar Handswitching Receptacle

Accepts only Aaron handpieces.

Bipolar Receptacle

Accepts only Aaron cables

for bipolar handpieces.

Footswitching Receptacle

Accepts only Aaron footswitch.

Handpiece Holder

Securely holds

Aaron handpiece

when not in use.

Patient Return

Electrode Receptacle

Accepts only Aaron return

electrode plugs designed

for the A940.

Service Guide • Aaron 940

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REAR AND SIDE PANEL VIEWS

Figure 2 – 4 Layout of controls and labeling on the rear and side panels

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SYMBOLS ON THE FRONT, SIDE AND REAR PANELS

The following table lists descriptions for symbols found on the Aaron 940

Caution: Jack location is a source of dangerous voltage.

Caution: Read directions for use prior to using equipment.

On (power: connection to the mains).

Off (power: disconnection from the mains).

Do not dispose of this device in the unsorted municipal waste

stream.

Monopolar output jack (hand control pencil jack).

Bipolar output jack.

Patient Plate, for use with Monopolar modes. (optional)

Footswitch jack, for foot controlled activation of monopolar (optional)

and bipolar devices.

Type B Equipment.

Non-ionizing radiation.

Neutral Electrode referenced to earth.

Volume control.

Explosion Risk if used with flammable anesthetics.

Fuse Enclosed.

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TECHNICAL SPECIFICATIONS

All specifications are nominal and subject to change without notice. A specification referred to as “typical” is within

± 20% of a stated value at room temperature (25° C / 77° F) and a nominal input power voltage.

PERFORMANCE CHARACTERISTICS

Input Power

Input Voltage

100-240 VAC ~ ± 10%

Mains line frequency range (nominal):

50 – 60 Hz

Power consumption:

75 VA

Fuses (two):

1.0 A 250 VAC

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Duty Cycle

Under maximum power settings and rated load conditions (Coagulation 40 W @ 1000 Ω load), the generator is

suitable for activation times of 10 seconds on, 30 seconds off for one hour.

NOTICE

The internal temperature of the unit is constantly being monitored. If the temperature rises above

85°C an alarm sounds, the system displays an error code, and the system disables output power.

Dimensions and Weight

Width

11.4 cm (4.5 in.)

Depth

11.4 cm (4.5 in.)

Height

16 cm (6.3 in.)

Weight

< 1.4 kg (< 3 lbs.)

Operating Parameters

Ambient temperature range

10° to 40° C (50° to 104° F)

Relative humidity

30% to 75%, non-condensing

Atmospheric pressure

700 hPa to 1060 hPa

Warm-up time

If transported or stored at temperatures outside the operating temperature range,

allow one hour for the generator to reach room temperature before use.

Transport and Storage

Ambient temperature range

-34˚ to 65˚ C (-29˚ to 149˚ F)

Relative humidity

0% to 75%, condensing during transport, non-condensing during storage

Atmospheric pressure

500 hPa to 1060 hPa

Audio Volume

The audio levels stated below are for the activation tone (bipolar and monopolar) and the alarm tone at a distance of

one meter. Audio levels meet the requirements for IEC 60601-2-2.

Activation Tone

Volume (adjustable)

40 to 65 dB

Frequency

All Modes: 833 Hz

Duration

Continuous while the generator is activated

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Alarm Tone

Volume (adjustable)

40 – 60 dB

Frequency

1 kHz 1⁄2 seconds / 2 kHz 1⁄2 seconds

Duration

2 seconds

Low Frequency (50-60 Hz) Leakage Current

Enclosure source current, ground open

< 300 µA

Source current, patient leads, all outputs

Normal polarity, intact ground: < 10 µA

Normal polarity, ground open: < 10 µA

Reverse polarity, ground open: < 10 µA

Sink current at high line, all inputs

< 10 µA

High Frequency (RF) Leakage Current

Bipolar RF leakage current

< 45 mA rms at 40 watts

Monopolar RF leakage current (additional tolerance)

< 150 mA rms

STANDARDS AND IEC CLASSIFICATIONS

Class I Equipment (IEC 60601-1)

Accessible conductive parts cannot become live in the event of a basic insulation failure because of the way in which

they are connected to the protective earth conductor.

Type BF Equipment (IEC 60601-1)

The Aaron 940 High Frequency Desiccator provides a high degree of protection against electric shock,

particularly regarding allowable leakage currents. It is type BF equipment.

Drip Proof (IEC 60601-2-2)

The generator enclosure is constructed so that liquid spillage in normal use does not wet electrical insulation or other

components which, when wet, are likely to affect adversely the safety of the generator.

Electromagnetic Interference

When other Aaron equipment is placed on or beneath an activated Aaron Medical High Frequency Desiccator, the

Aaron 940 High Frequency Desiccator operates without interference. The generator minimizes electromagnetic interference to video equipment used in the operating room.

Electromagnetic Compatibility (IEC 60601-1-2 and IEC 60601-2-2)

The Aaron 940 High Frequency Desiccator complies with the appropriate IEC 60601-1-2 and IEC 60601-2-2

specifications regarding electromagnetic compatibility.

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EMC COMPLIANCE

Special precautions should be taken regarding the Aaron 940. Medical Electrical Equipment needs special precautions regarding

EMC and needs to be installed and put into service according to the EMC information provided in this manual.

Understand that only the Accessories supplied with or ordered from Bovie Medical should be used with your device. The use of

Accessories, transducers, and cables other than those specified, may result in increased Emissions or decreased Immunity of the

Aaron 940. The Aaron 940 and its accessories are not suitable for interconnection with other equipment.

Portable and mobile RF communications equipment can affect Medical Electrical Equipment. The Aaron 940 should not be used

adjacent to or stacked with other equipment and that if adjacent or stacked use is necessary, the Aaron 940 should be observed to

verify normal operation in the configuration in which it will be used.

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Recommended separation distances between portable and mobile RF

communications equipment and the Aaron 940.

The Aaron 940 is intended for use in an electromagnetic environment in which radiated RF disturbances

are controlled. The customer or the user of the Aaron 940 can help prevent electromagnetic interference by maintaining a minimum distance between portable and mobile RF communications equipment

(transmitters) and the Aaron 940 as recommended below, according to the maximum output power of

the communications equipment.

Rated maximum output

power of transmitter

Separation distance according to frequency of transmitter in metres (m)

W

150 kHz to 80 MHz

d = 1.2 P

80 MHz to 800 MHz

d = 1.2 P

800 MHz to 2.5 GHz

d = 2.3 P

0.01

0.12

0.12

0.23

0.1

0.38

0.38

0.73

1

1.2

1.2

2.3

10

3.8

3.8

7.3

100

12

12

23

For transmitters rated at a maximum output power not listed above, the recommended separation

distance d in metres (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.

Guidance and manufacturer’s declaration – electromagnetic emissions

The Aaron 940 is intended for use in the electromagnetic environment listed below. The customer or the

user of the Aaron 940 should assure that is is used in such an environment.

Emissions test

Compliance

RF Emissions CISPR 11

Group 2

RF Emissions CISPR 11

Class A

Harmonic emissions

IEC 61000-3-2

Class A

Voltage fluctuations/flicker

emissions

IEC 61000-3-3

Complies

Service Guide • Aaron 940

Electromagnetic environment - guidance

The Aaron 940 must emit

electromagnetic energy in order

to perform its intended function.

Nearby electronic equipment may

be affected.

The Aaron 940 is suitable for

use in all establishments other

than domestic and those directly

connected to the public low-voltage power supply network that

supplies buildings used in

domestic purposes.

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Guidance and manufacturer’s declaration – electromagnetic immunity

The Aaron 940 is intended for use in the electromagnetic environment listed below. The customer or the

user of the Aaron 940 should assure that it is used in such an environment.

Immunity test

IEC 60601

test level

Compliance level

Electrostatic discharge

(ESD) IEC 61000-4-2

±6 kV contact

±8 kV air

±6 kV contact

±8 kV air

Electrical fast transient/burst

IEC 61000-4-4

±2 kV for power

supply lines

±1 kV for

input/output lines

±2 kV for power

supply lines

Surge IEC 61000-4-5

±1 kV differential

mode

±2 kV common

mode

±1 kV differential

mode

±2 kV common

Not Applicable

Electromagnetic environment - guidance

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.

<5 % Ut

<5 % Ut

(>95 % dip in Ut ) (>95 % dip in Ut )

for 0.5 cycle

for 0.5 cycle

Mains power quality should be that

of a typical commercial or hospital

40 % Ut

Voltage dips, short

(60 % dip in Ut ) for environment. If the user of the

interruptions and voltage

Aaron 940 requires continued

5 cycles

variations on power supply

operation during power mains

70 % Ut

70 % Ut

input lines

interruptions, it is recommended

(30 % dip in Ut ) (30 % dip in Ut ) for that the Aaron 940 be powered

IEC 61000-4-11

25 cycles

from an uninterruptible power supfor 25 cycles

ply or a battery.

<5 % Ut

<5 % Ut

(>95 % dip in Ut ) (>95 % dip in Ut )

for 5 sec

for 5 sec

40 % Ut

(60 % dip in Ut )

for 5 cycles

Power frequency (50/60

Hz) magnetic field

IEC 61000-4-8

3 A/m

3 A/m

Power frequency magnetic fields

should be at levels characteristic

of a typical location in a typical

commercial or hospital

environment.

NOTE Ut is the a.c. mains voltage prior to application of the test level.

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Guidance and manufacturer’s declaration – electromagnetic immunity continued...

Immunity test

Conducted RF

IEC 61000-4-6

IEC 60601

test level

3 Vrms

150 kHz to 80

MHz

Compliance level

3 Vrms (V1)

Electromagnetic environment - guidance

Portable and mobile RF communications

equipment should be used no closer to any part

of the Aaron 940, including cables, than the

recommended separation distance calculated

from the equation applicable to the frequency of

the transmitter.

Recommended separation distance

d = [ 3.5] P

3

d = [ 3.5] P

3

80 MHz to 800 MHz

d = [7

3

Radiated RF

IEC 61000-4-3

3 V/m

80 MHz to

2.5 GHz

3 V/m (E1)

]

P

800 MHz to 2.5 GHz

where P is the maximum output power rating of

the transmitter in watts (W) according to the

transmitter manufacturer and d is the

recommended separation distance in metres (m)

Field strengths from fixed RF transmitters, as

determined by an electromegnetic site survey,a

should be less than the compliance level in each

frequency range.b

Interference may occur in the vicinity of

equipment marked with the

following symbol.

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.

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

predicated 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 which the Aaron 940 is used exceeds the applicable RF compliance level above, the Aaron 940

should be observed to verify normal operation. If abnormal performance is observed, additional

measures may be necessary, such as reorienting or relocating the Aaron 940.

b

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

Service Guide • Aaron 940

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