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Contents 1. Introduction How to Use This Manual 4 Hewlett-Packard Service Organization 5 Sales Representative 5 Customer Engineer (CE 5 Applications Engineer (AE 5 Hewlett-Packard Site Preparation Services 7 Site Planning Visit 7 Site Veriﬁcation Visit 7 Third Party Service 8 Customer Responsibilities 9 Local Codes 9 Data Communications Equipment 10 Selection of Site Personnel 10 Site Coordinator 10 Principal Operator 11 Site Planning Team 11 2. Site Preparation Guidelines Site Planning Time Table 14 Preparing for Installation 15 Computer Site Safety Considerations 15 Floor Plan 16 Computer Room Construction 17 Power Requirements 18 Sources of Electrical Interference 21 Environmental Considerations 22 5

Section	Page
HP Visualize J Class Workstations Site Preparation Guide	1
HP Visualize J Class Workstations Site Preparation Guide	1
HP Visualize J Class Workstations Site Preparation Guide	1
Edition 3	1
Manufacturing Part Number: A4978-90021	1
Printed in USA January 2000	1
Notice	2
Notice	2
The information contained in this document is subject to change without notice.	2
Warranty - A copy of the specific warranty terms applicable to your Hewlett-Packard product and/o...	2
Hewlett-Packard makes no warranty of any kind with regard to this manual, including, but not limi...	2
Restricted Rights Legend - Use, duplication, or disclosure by the U.S. Government is subject to r...	2
Hewlett-Packard Company 3404 East Harmony Road Fort Collins, CO 80528-9599	2
Rights for non-DOD U.S. Government Departments and Agencies are as set forth in FAR 52.227-19 (c)...	2
© Copyright 1999 Hewlett-Packard Company. All Rights Reserved.	2
© Copyright 1999 Hewlett-Packard Company. All Rights Reserved.	2
Reproduction, adaptation, or translation without prior written permission is prohibited, except a...	2
Printing History	2
Printing History	2
New editions of this manual incorporate all material updated since the previous editon. Update pa...	2
The manual part number and printing date indicate its current edition. The manual part number cha...	3
HP Part NumberPrinting DateEdition A4978-90020April 1999...	3
1 Introduction	7
1 Introduction	7
How to Use This Manual	8
How to Use This Manual	8
This manual contains site preparation information for the HP Visualize J Class workstations. Othe...	8
Proper site preparation and maintenance is vital to the reliability of any computer system. As ou...	8
This manual contains the following chapters and appendices:	8
• Chapter 1: Introduction (this chapter) is an introduction to Hewlett-Packard’s service organiza...	8
• Chapter 1: Introduction (this chapter) is an introduction to Hewlett-Packard’s service organiza...	8
• Chapter 2: Site Preparation Guidelines contains site preparation and planning information for t...	8
• Chapter 3: Receiving the Workstation contains information on the receipt of the J Class worksta...	8
• Appendix A: Site Preparation Kit contains planning worksheets for site preparation.	8
• Appendix B: Specifications and Regulatory Requirements contains specification and regulatory re...	8
Hewlett-Packard Service Organization	9
Hewlett-Packard Service Organization	9
Each member of the Hewlett-Packard service organization is dedicated to making sure that each cus...	9
The Hewlett-Packard service organization includes the following representatives.	9
Sales Representative	9
Sales Representative	9
The Hewlett-Packard Sales Representative is the customer’s primary point of contact. Each Sales R...	9
Customer Engineer (CE)	9
Customer Engineer (CE)	9
The Hewlett-Packard Customer Engineer (CE) is trained and experienced in servicing computer equip...	9
Applications Engineer (AE)	9
Applications Engineer (AE)	9
The Hewlett-Packard Applications Engineer (AE) is a technical specialist for the HP Visualize J C...	9
Hewlett-Packard Site Preparation Services	11
Hewlett-Packard Site Preparation Services	11
The following subsections outline Hewlett-Packard’s site preparation services.	11
Site Planning Visit	11
Site Planning Visit	11
A site planning visit is available as a purchase option at additional cost to the customer. Upon ...	11
As a result of this visit, a site layout plan agreeable to you and Hewlett-Packard will be created.	11
Note that all of your computer requirements and specifications are contained in this manual.	11
Site Verification Visit	11
Site Verification Visit	11
A Hewlett-Packard CE or Site Preparation Specialist will verify that your site meets or exceeds y...	11
Hewlett-Packard provides service under the conditions of the Computer Products Warranty and Insta...	11
Third Party Service	11
Third Party Service	11
If an HP Visualize J Class workstation and/or applications software is purchased from a “third pa...	11
In the situation of a third party purchase, a maintenance agreement for hardware and an Account M...	12
Customer Responsibilities	13
Customer Responsibilities	13
The customer is responsible for planning and preparing a suitable environment for the installatio...	13
If computers are new to your site, you will need to pay particular attention to the following items:	13
• Local building codes	13
• Local building codes	13
• Local electrical codes	13
• Local safety codes	13
• Space and weight limitations/system accessibility	13
• Environmental requirements (temperature, humidity, etc.)	13
• Electrical and grounding requirements	13
If your computer is to be installed in an existing computer room, you should analyze the followin...	13
• Available space	13
• Available space	13
• Environmental requirements	13
• Electrical requirements	13
Local Codes	13
Local Codes	13
Special local codes exist in some locations which regulate the installation of computer equipment...	13
Data Communications Equipment	13
Data Communications Equipment	13
The customer is responsible for ordering and installing all required data communications equipmen...	13
• Any hardware or cables for connection or installation of data communications equipment	14
• Any hardware or cables for connection or installation of data communications equipment	14
• Network links	14
• Telephone equipment	14
• Modems (Consult with your CE for Hewlett-Packard requirements.)	14
• Equipment supplied by companies other than HP	14
NOTE Communications equipment at the computer site is not part of the computer and must be consid...	14
NOTE Communications equipment at the computer site is not part of the computer and must be consid...	14
Selection of Site Personnel	14
Selection of Site Personnel	14
Depending on the complexity of the computer system, the customer is responsible for selecting a S...	14
Site Coordinator	14
Site Coordinator	14
The Site Coordinator is responsible for the following tasks:	14
• Establishing and maintaining site preparation schedules	14
• Establishing and maintaining site preparation schedules	14
• Coordinating construction efforts	14
• Being the primary liaison with Hewlett-Packard representatives	14
Principal Operator	14
Principal Operator	14
The Principal Operator is responsible for the following tasks:	14
• System operation	14
• System operation	14
• Monitoring site preparation	14
• Ordering computer supplies	15
• Scheduling user training	15
• Maintaining maintenance schedules	15
Site Planning Team	15
Site Planning Team	15
The Site Planning Team is responsible for the following tasks:	15
• Determining site location and size	15
• Determining site location and size	15
• Reviewing construction requirements	15
• Reviewing local codes	15
• Reviewing insurance requirements	15
• Scheduling all events related to site completion	15
Members of the Site Planning Team should include the Site Coordinator, Principal Operator, Hewlet...	15
2 Site Preparation Guidelines	17
2 Site Preparation Guidelines	17
Site Planning Time Table	18
Site Planning Time Table	18
The guidelines below are a summary of the Pre-Installation Worksheet in Appendix A of this manual...	18
The following are four items that may require several weeks lead time:	18
Due to potential delays, Hewlett-Packard recommends that the suppliers of the above services be c...	18
There are four items that may require up to six weeks lead time:	18
• Assigning your Principal Operator.	18
• Assigning your Principal Operator.	18
• When your purchase order has included the optional site planning visit, scheduling this visit w...	18
• Selecting an appropriate system location and planning the physical arrangement of the system, i...	18
• Ordering any consumable supplies, including any appropriate storage media (such as DDS tapes or...	18
NOTE To schedule the site planning visit, three days advance notice is required.	18
NOTE To schedule the site planning visit, three days advance notice is required.	18
Preparing for Installation	19
Preparing for Installation	19
The following subsections contain information to help you properly plan for the arrival and insta...	19
NOTE If you purchased any upgrades (processor, I/O cards, etc.), install the new component before...	19
NOTE If you purchased any upgrades (processor, I/O cards, etc.), install the new component before...	19
Computer Site Safety Considerations	19
Computer Site Safety Considerations	19
The two major safety considerations for any computer site are fire safety and emergency electrica...	19
Fire Safety	19
Fire Safety	19
When considering fire safety, the customer’s insurance carrier should be consulted for suggestion...	19
Emergency Electrical Power Shut-Off	19
Emergency Electrical Power Shut-Off	19
The computer system power panel should include a shunt-trip wired to an emergency shut-off switch...	19
Floor Plan	19
Floor Plan	19
Hewlett-Packard recommends that a floor plan be prepared showing the overall location and arrange...	19
Select a location that can accommodate the addition of more equipment as your requirements increa...	20
CAUTION Hewlett-Packard strongly discourages the use of carpeting, including so- called anti-stat...	20
CAUTION Hewlett-Packard strongly discourages the use of carpeting, including so- called anti-stat...	20
Computer Room Construction	20
Computer Room Construction	20
If you are planning to construct a new computer room or modify an existing site, first consult wi...	20
The computer room’s floor must be able to support the total weight of your computer system as wel...	20
To estimate floor strength requirements, you should consider the following:	20
• Total weight of your computer. (The minimum and maximum configuration weights of the J Class ar...	20
• Total weight of your computer. (The minimum and maximum configuration weights of the J Class ar...	20
• Total weight of your computer system’s peripherals. Your Hewlett-Packard Sales Representative a...	21
• Total weight of furniture such as desks, chairs, tables, cabinets, etc. (Refer to your floor pl...	21
• Total approximate weight of computer room personnel.	21
• Weight of moving equipment (such as forklifts, transport dollies, etc.).	21
Power Requirements	21
Power Requirements	21
The most important installation considerations for the J Class are the power requirements. Table ...	21
Line Voltage	21
Line Voltage	21
The AC line voltage available from a wall outlet is determined by the local electrical power prov...	21
Dedicated Circuits	22
Dedicated Circuits	22
The J Class workstation requires a dedicated circuit or individual branch circuits (separate circ...	22
The current specification of each circuit breaker should be designed to allow for the system star...	22
CAUTION For installations where a UPS is installed, the J Class workstation may experience a syst...	22
CAUTION For installations where a UPS is installed, the J Class workstation may experience a syst...	22
However, if there is a circuit breaker between the UPS and the power outlet, the circuit breaker ...	22
Safety and Dedicated Grounds	22
Safety and Dedicated Grounds	22
The primary reason for grounding electrical systems is safety. The safety ground is required by t...	22
Receptacles	22
Receptacles	22
When receptacles are used to connect system components to AC power, the receptacles must include ...	22
When installing receptacles, ensure that each receptacle has its own neutral (if required) and gr...	22
Computer equipment power cord and plug requirements also vary from country to country. Unusual po...	23
Power Line Transients and Noise	23
Power Line Transients and Noise	23
Heavy electrical loads from nearby machinery or equipment (such as elevators or electric welders)...	23
Your Hewlett-Packard CE can monitor your power line for electrical noise and transients. If found...	23
Sources of Electrical Interference	23
Sources of Electrical Interference	23
Convenience Wall Outlets	23
Convenience Wall Outlets	23
Power outlets for building maintenance equipment (such as vacuum cleaners, floor buffers, etc.) m...	23
Lightning	23
Lightning	23
In some geographical areas, it may be advisable to install lightning protection for safety of per...	23
The principles of lightning protection and personnel safety are outlined in detail in the lightni...	24
Vibration	24
Vibration	24
Continuous vibration can cause a degradation of mechanical parts. Vibration can cause data loss o...	24
If you suspect that vibration may be a problem at your computer site, contact your Hewlett-Packar...	24
Electromagnetic Interference	24
Electromagnetic Interference	24
The J Class workstation is specifically designed for reduced susceptibility to radiated and condu...	24
Environmental Considerations	24
Environmental Considerations	24
NOTE There are different environmental requirements for each peripheral that can be used in your ...	24
NOTE There are different environmental requirements for each peripheral that can be used in your ...	24
Flammable Materials	24
Flammable Materials	24
Fundamental safeguards for computer systems should include a site well away from any sources of p...	24
Airborne Contaminants	25
Airborne Contaminants	25
Airborne contaminants and particles of a certain size and hardness can damage your computer syste...	25
The Hewlett-Packard CE can assist you in determining whether or not you need be concerned about a...	25
Temperature and Humidity	25
Temperature and Humidity	25
The temperature and humidity specifications for the J Class workstations are contained in Appendi...	25
Temperature	25
Temperature	25
The computer system operates most reliably if room temperature is maintained between 68 and 77 F...	25
Humidity	25
Humidity	25
Electrostatic Discharge	26
Electrostatic Discharge	26
If there is an abnormally high level of static electricity at your computer system’s location (4 ...	26
Other ways to minimize electrostatic discharge are by using specially grounded mats in front of t...	26
Miscellaneous Requirements	27
Miscellaneous Requirements	27
The following subsections contain information not directly related to the computer system’s insta...	27
Computer Supplies	27
Computer Supplies	27
Ask your Hewlett-Packard Sales Representative for a catalog of available supplies such as floppy ...	27
Media Storage	27
Media Storage	27
You should make provisions for storing floppy diskettes and DDS tape cartridges in or near the ar...	27
Extreme temperature or humidity differences between the working and storage areas can alter the s...	27
If your working and storage areas cannot be kept at the same temperature and humidity, allow ampl...	27
Data on magnetic media can be erased by magnetic fields. These magnetic fields are found in power...	27
Protection of Valuable Records	28
Protection of Valuable Records	28
Safeguards should be taken to protect business records and any other information that is either v...	28
A regular updating process should be put in place to ensure that the value of the stored informat...	28
Telephone	28
Telephone	28
You should plan to install a telephone with a long cord or a cordless handset near your computer ...	28
NOTE Check with your local telephone company to be sure the telephone service at the site can acc...	28
NOTE Check with your local telephone company to be sure the telephone service at the site can acc...	28
3 Receiving the Workstation	29
3 Receiving the Workstation	29
Equipment Arrivals	30
Equipment Arrivals	30
All Hewlett-Packard equipment is delivered directly from its point of manufacture. Hewlett-Packar...	30
In some cases, factors beyond the control of Hewlett-Packard may cause delivery delays. If all eq...	30
Checking for Shipping Shortage and Damage	30
Checking for Shipping Shortage and Damage	30
As shipments arrive, check the carrier’s “Bill of Lading” carefully to ensure that every item shi...	30
Inspect all of the shipping containers for signs of damage before actually unpacking any of the e...	30
Regardless of the circumstances, the Hewlett-Packard CE will take immediate action to replace any...	30
Unpacking the Cartons	30
Unpacking the Cartons	30
The equipment cartons can be unpacked at your convenience; but it is the customer’s responsibilit...	30
Locate the packing list (invoice) for each carton that is to be unpacked and ensure that each ite...	30
Leave the sealed cartons containing cables and installation hardware intact for the Hewlett-Packa...	31
Locate and refer to the HP Visualize J Class Installation Card (HP part number A4978-90010) for s...	31
4 Site Preparation Kit	33
4 Site Preparation Kit	33
Introduction	34
Introduction	34
This appendix contains the following information:	34
• Pre-installation worksheets	34
• Pre-installation worksheets	34
• System power requirements and heat dissipation worksheets	34
Hewlett-Packard recommends that you copy the worksheets before you begin using them. Then, if mor...	34
Pre-Installation Worksheets	35
Pre-Installation Worksheets	35
<TABLE>	35
Table 41 Pre-Installation Activities Worksheet	35
<TABLE HEADING>	35
<TABLE ROW>	35
Timing	35
Timing	35
Activity	35
Activity	35
Date	35
Date	35
<TABLE BODY>	35
<TABLE ROW>	35
6 weeks before installation	35
6 weeks before installation	35
• Select the location for the system. Use the Site Preparation Guide to satisfy any requirements ...	35
• Select the location for the system. Use the Site Preparation Guide to satisfy any requirements ...	35
• Select the location for the system. Use the Site Preparation Guide to satisfy any requirements ...	35
• Assign a person the responsibility of system Principal Operator.	35
• Plan the physical arrangement of the system and its peripherals.	35
• Order supplies that are required for uninterrupted operation of the system (consumable supplies).	35
<TABLE ROW>	35
At system delivery	35
At system delivery	35
• Inspect each shipment as it is delivered. Note comments and dates in shipment schedule.	35
• Inspect each shipment as it is delivered. Note comments and dates in shipment schedule.	35
• Inspect each shipment as it is delivered. Note comments and dates in shipment schedule.	35
• When all equipment arrives, contact the CE to schedule the installation and verify that the sit...	35
<TABLE ROW>	35
System installation	35
System installation	35
Arrange for the System Manager to assist the CE with the installation process.	35
Arrange for the System Manager to assist the CE with the installation process.	35
<TABLE>	36
Table 42 Shipment Schedule	36
<TABLE HEADING>	36
<TABLE ROW>	36
Equipment Type	36
Equipment Type	36
Scheduled Ship Date	36
Scheduled Ship Date	36
Arrival Date	36
Arrival Date	36
Comments	36
Comments	36
<TABLE BODY>	36
<TABLE ROW>	36
Computer	36
Computer	36
<TABLE ROW>	36
<TABLE ROW>	36
<TABLE ROW>	36
<TABLE ROW>	36
Printer	36
Printer	36
<TABLE ROW>	36
<TABLE ROW>	36
<TABLE ROW>	36
<TABLE ROW>	36
Terminal	36
Terminal	36
<TABLE ROW>	36
<TABLE ROW>	36
<TABLE ROW>	36
<TABLE ROW>	36
External Disk Drive	36
External Disk Drive	36
<TABLE ROW>	36
<TABLE ROW>	36
<TABLE ROW>	36
<TABLE ROW>	36
External Tape Drive	36
External Tape Drive	36
<TABLE ROW>	36
<TABLE ROW>	36
<TABLE ROW>	36
<TABLE ROW>	36
<TABLE ROW>	37
Peripherals or other equipment	37
<TABLE ROW>	37
<TABLE ROW>	37
<TABLE ROW>	37
System Power and Heat Dissipation Worksheets	38
System Power and Heat Dissipation Worksheets	38
Use Table A-3 to calculate the system’s power requirements. Have an electrician double-check the ...	38
<TABLE>	38
Table 43 Worksheet for Power Requirement Calculations	38
<TABLE HEADING>	38
<TABLE ROW>	38
Equipment Type	38
Equipment Type	38
Product Number	38
Product Number	38
Voltage (V)	38
Amperage (A)	38
Amperage (A)	38
Number of Machines (B)	38
Total Amperage (A ¥ B)	38
Total Amperage (A ¥ B)	38
<TABLE BODY>	38
<TABLE ROW>	38
Computer	38
Computer	38
<TABLE ROW>	38
<TABLE ROW>	38
<TABLE ROW>	38
External Disk Drives	38
<TABLE ROW>	38
<TABLE ROW>	38
<TABLE ROW>	38
Printers	38
Printers	38
<TABLE ROW>	38
<TABLE ROW>	38
<TABLE ROW>	38
Terminals	38
Terminals	38
<TABLE ROW>	38
<TABLE ROW>	38
<TABLE ROW>	38
Other	38
Other	38
<TABLE ROW>	38
<TABLE ROW>	38
<TABLE ROW>	38
Use Table A- 4 to calculate the system’s heat dissipation. Depending on the component combination...	39
<TABLE>	39
Table 44 Worksheet for Heat Dissipation Calculations	39
<TABLE HEADING>	39
<TABLE ROW>	39
Equipment Type	39
Equipment Type	39
Product Number	39
Product Number	39
Watts (W)	39
Watts (W)	39
BTU/hr (A)	39
BTU/hr (A)	39
Number of Machines (B)	39
Number of Machines (B)	39
Total Heat Dissipation	39
Total Heat Dissipation	39
(A ¥ B)	39
<TABLE BODY>	39
<TABLE ROW>	39
Computer	39
<TABLE ROW>	39
<TABLE ROW>	39
Disk Drive	39
<TABLE ROW>	39
<TABLE ROW>	39
Printers	39
<TABLE ROW>	39
<TABLE ROW>	39
Terminals	39
Terminals	39
<TABLE ROW>	39
<TABLE ROW>	39
Other	39
Other	39
<TABLE ROW>	39
To account for the heat dissipation by accessory equipment, light, and people, complete Table A-4...	39
• Consider the heat dissipated by special interface equipment (supplied by other vendors), as wel...	39
• Consider the heat dissipated by special interface equipment (supplied by other vendors), as wel...	39
• Estimate the heat produced by the lights used to illuminate the facility.	39
• Calculate the heat dissipation of all individuals working within the site. A reasonable estimat...	39
• Make allowances for heat dissipation by equipment to be added during any planned future expansion.	39
• Calculate the heat dissipated by any other factors not already considered. These factors includ...	39
<TABLE>	40
Table 45 System Heat Dissipation Worksheet	40
<TABLE HEADING>	40
<TABLE ROW>	40
Factor	40
Factor	40
BTUs/Hour (Watts)	40
BTUs/Hour (Watts)	40
<TABLE BODY>	40
<TABLE ROW>	40
System Heat Dissipation	40
<TABLE ROW>	40
Site Variables	40
Site Variables	40
<TABLE ROW>	40
Interface Auxiliary Equipment	40
Interface Auxiliary Equipment	40
<TABLE ROW>	40
Lights	40
<TABLE ROW>	40
Personnel	40
Personnel	40
<TABLE ROW>	40
Future Expansion	40
Future Expansion	40
<TABLE ROW>	40
Other Factors	40
Other Factors	40
<TABLE ROW>	40
Total Heat Dissipated	40
Total Heat Dissipated	40
<TABLE ROW>	40
Total heat dissipation in tons of AC	40
Total heat dissipation in tons of AC	40
(1 ton = 12,000 BTU)	40
5 Specifications and Regulatory Requirements	41
5 Specifications and Regulatory Requirements	41
Introduction	42
Introduction	42
This appendix contains the environmental, electrical, and physical specifications, as well as the...	42
The information in this appendix is arranged as follows:	42
• Specifications	42
• Specifications	42
• Regulatory Requirements	42
Specifications	43
Specifications	43
Environmental Specifications	43
Environmental Specifications	43
Altitude	43
Altitude	43
<TABLE>	43

Match case Limit results 1 per page

Contents

1. Introduction

How to Use This Manual. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

Hewlett-Packard Service Organization . . . . . . . . . . . . . . . . . . . . . . . . . . .5

Sales Representative . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

Customer Engineer (CE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

Applications Engineer (AE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

Hewlett-Packard Site Preparation Services. . . . . . . . . . . . . . . . . . . . . . . .7

Site Planning Visit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

Site Veriﬁcation Visit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

Third Party Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

Customer Responsibilities. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

Local Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

Data Communications Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

Selection of Site Personnel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

Site Coordinator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

Principal Operator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

Site Planning Team . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

Site Preparation Guidelines

Site Planning Time Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14

Preparing for Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

Computer Site Safety Considerations . . . . . . . . . . . . . . . . . . . . . . . . . .15

Floor Plan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16

Computer Room Construction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17

Power Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18

Sources of Electrical Interference . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21

Environmental Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22