Datum 4040B Bedienungsanleitung
4040B Caesium Time & Frequency Standard
OPERA
OPERATING MANUAL
TING MANUAL
4040B
4040B #08518-201, REV AG
#08518-201, REV AG
Copyright Notice
4040B
COPYRIGHT 2001 DATUM - TT&M ALL RIGHTS RESERVED
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.
I
TABLE OF CONTENTS
II
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
1
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
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.
2
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.
3
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.
A
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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