Datum 4040B Manuale utente

4040B Caesium Time & Frequency Standard

OPERA

OPERATING MANUAL

TING MANUAL

4040B

4040B #08518-201, REV AG

#08518-201, REV AG

4040B

This manual is provided to assist the user in the operation and maintenance of the supplied equipment

or software. It is recognized that multiple copies may be required to support even a single unit, and

for this reason, permission is hereby granted to reproduce the supplied User’s Guide for the purpose

stated above, provided that this notice is included as part of the copy. Additional copies are also

available from Datum - TT&M for a nominal fee.

In no case, however, does the supply of this manual or the granting of rights to reproduce the manual,

grant any rights to use information contained within to reproduce the supplied equipment or software,

either in whole or in part.

The equipment or software described in this manual have been developed solely at the expense of

Datum - TT&M and are proprietary. No unlimited rights in technical data are granted. Limited rights

as per DFARS 252.227-7013 shall be effective for 10 years from the copyright date.

TABLE OF CONTENTS

CHAPTER ONE

Introduction/Product Overview 1

Instrument Identification 1

About This Manual 2

Typographical and Other Conventions 3

Instrument Identification 3

CHAPTER TWO

Installation 6

Environment 6

Mounting 6

Electrical Connections 6

External DC Connections 7

Unit Certifications 7

Preparation for Shipment 9

CHAPTER THREE

Operation 12

Turn-On Procedure 12

Operational Check 13

Connections to RS232 Interface 14

Start-Up Phase 14

Turn-On Without PC 15

PC-Assisted Turn-On 15

1 PPS Output 16

III

TABLE OF CONTENTS

CHAPTER FOUR

Remote Control Software 18

Monitor.exe Software 18

Setting Up the Serial Link 19

Operating Instructions 20

Parameters 21

Alarms 25

Minor Alarm Messages 25

Major Alarm Messages: (without tube shutdown) 25

Major Alarm Messages: (resulting in tube shutdown) 26

Graphic Display 27

Miscellaneous Functions 28

Format of ASCII Strings Transmitted & Received at the PC 29

Remote Control On 29

Remote Control Off 29

Request Variables Data Message 30

Request Constants Data Message 31

Remote Control Commands 32

CHAPTER FIVE

Specifications 33

Performance 33

Outputs 34

Controls 34

General 34

Environment 35

Options 37

Monitor Pin-Out 38

Storage/Shelf Life 41

CHAPTER SIX

Options 42

Option 063 – DS1 Frequency Synthesizer 42

Option 063 Specifications 44

Operation 45

Theory of Operation 47

Option 064 – CEPT Frequency Synthesizer 49

Option 064 Specifications 52

Installation 53

INTRODUCTION/PRODUCT OVERVIEW

The Datum 4040B CaesiumTime and Frequency Standard is a primary frequency and time reference

with microprocessor control. The major function of the Datum 4040B is to produce accurate, stable,

and spectrally pure sinusoidal signals, and precise timing signals. To accomplish this, a caesiumbeam

tube resonator is used to stabilize the output of a quartz crystal oscillator.

A microprocessor is used to perform the following tasks:

• Digital demodulation and integration of the servo loop signals

• Monitoring of system parameters

• Control of adaptive servos

• Diagnostic functions to aid in troubleshooting

The Datum 4040B operates from 90/240 VAC or 22 to 56 VDC.

FIGURE 1-1. DATUM 4040B FRONT AND REAR PANELS

Chapter One

4040B

WHO SHOULD READ THIS OPERATING MANUAL?

This Operating Manual is designed for the following categories of users:

Systems Engineers – Chapter Two provides installation procedures. Chapter Three details operating

procedures, and Chapter Four defines the format and communication protocol for the serial input/out-

put control port. Finally, Chapter Five lists detailed specifications for the Datum 4040B.

Installation Engineers – Chapter Two and three provide the bulk of the information needed for suc-

cessful installation and validation of operation.

ABOUT THIS OPERATING MANUAL

This Operating Manual is intended to be used as a reference for the Datum 4040BCaesiumTime and

Frequency Standard. This Operating Manual has an introduction to the Datum 4040B, followed by pro-

cedures for installation, power-up, and operation.

This Operating Manual contains the following chapters and appendices:

• Chapter One – Introduction/Product Overview: This chapter includes an overview of this Operating

Manual, the intended audience, and the stylistic and typographical conventions used.

• Chapter Two – Installing the Datum 4040B: Describes initial inspection of the 4040B, preparation for

use, and signal interconnections.

• Chapter Three – Operation: Describes the local operation of the 4040B.

• Chapter Four – Remote Control Software: Describes the protocol and data available through the RS-

232C Input/Output serial port.

• Chapter Five – Specifications: Describes the system specifications information.

• Chapter Six – Options: Describes options 063 and 064.

4040B

TYPOGRAPHICAL AND OTHER CONVENTIONS

This Operating Manual uses the following conventions:

Acronyms and Abbreviations – Terms are spelled out the first time they appear in this

Operating Manual. Thereafter, only the acronym or abbreviation is used. In addition, the glossary

defines the acronyms and abbreviations.

Revision Control – The title page lists the printing date and part number of this Operating Manual.

Table 1-1 describes the typographical conventions that this Operating Manual uses to

distinguish between the different types of information according to how they are used.

TABLE 1-1. TYPOGRAPHICAL CONVENTIONS

INSTRUMENT IDENTIFICATION

A slash (/) and a three-digit number, following the four-digit model number (4040B) specifies an option

that is supplied within the instrument. See Chapter Five for a list of available options. Chapter Six pro-

vides descriptions for Options 063 and 064.

WHEN TEXT APPEARS THIS WAY ... IT MEANS ...

4040B Operating Manual

The title of a document or the name of

a product

CRITICAL PORT-1 J1 An operating mode, alarm state, status or

chassis label.

Press the Enter Key A named keyboard key. The key name is shown

as it appears on the keyboard. An explanation

Press the Print Scrn Key of the keys acronym or function immediately

follows the first reference to the key, if required.

re-timing

application ... A term or word being emphasized.

Datum does not recommend ... A word or term given special emphasis so that

you do not miss the idea being presented.

4040B

WARNINGS, CAUTIONS, RECOMMENDATIONS, AND NOTES

Warnings, Cautions, Recommendations, and Notes attract attention to essential or critical

information in this Operating Manual. The types of information included in each are explained as

follows:

WARNING …

All warnings have this symbol. Do not disregard warnings. They are installation,

operation, or maintenance procedures, practices, or statements that if not strictly

observed, may result in personal injury or loss of life.

ELECTRICAL SHOCK HAZARD …

All electrical shock hazard warnings have this symbol. To avoid serious personal injury

or death, do not disregard electrical shock hazard warnings. They are installation,

operation, or maintenance procedures, practices, or statements that if not strictly

observed, may result in personal injury or loss of life.

CAUTION …

All cautions have this symbol. Do not disregard cautions. They are installation, operation,

or maintenance procedures, practices, conditions, or statements that if not strictly

observed, may result in damage to or destruction of equipment or may cause a long-term

health hazard.

CAUTION …

All Electrostatic Discharge (ESD) cautions have this symbol. They are installation,

operation, or maintenance procedures, practices, conditions, or statements that if not

strictly observed, may result in electrostatic discharge damage to, or destruction of,

static sensitive components of the equipment.

RECOMMENDATION …

All recommendations have this symbol. Recommendations indicate manufacturer-tested

methods or known functionality. They contain installation, operation, or maintenance

procedures, practices, conditions, or statements that provide you with important

information for optimum performance results.

NOTE …

All notes have this symbol. Notes contain installation, operation, or maintenance

procedures, practices, conditions, or statements that alert you to important information

which may make your task easier or increase your understanding.

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