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Revision 1.00
FS752 G NSS Disciplined
Time and Frequency
Reference
User Manual
FS752 GNSS Time and Frequency Reference Stanford Research Systems
Certication
Stanford Research Systems certifies that this product met its published specifications at the time
of shipment.
Warranty
This Stanford Research Systems product is warranted against defects in materials and
workmanship for a period of one (1) year from the date of shipment.
Service
For warranty service or repair, this product must be returned to a Stanford Research Systems
authorized service facility. Contact Stanford Research Systems or an authorized representative
before returning this product for repair.
Information in this document is subject to change without notice.
Copyright © Stanford Research Systems, Inc., 2019. All rights reserved.
Stanford Research Systems, Inc.
1290-C Reamwood Avenue
Sunnyvale, California 94089
Phone: (408) 744-9040
Fax: (408) 744-9049
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Printed in the U.S
FS752 GNSS Time and Frequency Reference Stanford Research Systems
i Table of Contents
FS752 GNSS Time and Frequency Reference Stanford Research Systems
Contents
Contents i
Revisions v
Safety and Preparation for Use vii
Symbols You May Find on SRS Products viii
Specifications ix
Remote Interface Commands xiii
Quick Start Instructions 1
Installing the FS752 1
Installing the Antenna 1
Selecting a Location for the Antenna 1
Antennas Offered by SRS 2
Active Antenna Required 2
Antenna Warning LED 2
Antenna Delay Correction 2
GNSS-Outdoor Antenna Kit (Model O740ANT2) 3
Outdoor Antenna Kit Contents 3
Design Considerations 4
Mounting the Antenna 5
Lightning Protection 5
Troubleshooting 7
Global Navigation for Timing 9
FS752 Feature Overview 9
Theory of Operation 10
Global Navigation Systems 10
How Does GPS Work 10
Using GPS Satellites for Timing 11
Position Survey for Improved Timing 11
Locking to GNSS Satellites 12
Phase Lock Loop Design 12
Predictive Filtering 13
Timebase Stability 13
Adaptive Bandwidth 14
Losing Lock to GNSS 14
Monitoring Lock to GNSS 14
FSM States 15
Power On 15
Search 16
Stabilize 16
Table of Contents ii
FS752 GNSS Time and Frequency Reference Stanford Research Systems
Validate 16
Lock 16
Holdover States 17
Recovering From Holdover 17
System Alarm 17
Timebase Events 18
Instrument Operation 19
Front Panel 19-
Display 19
Rear Panel 19-
AC Power 19
USB 20
Alarm Relay 20
Antenna Input 20
1 PPS and 10 MHz Distribution 20
Standard Distribution 20
Option 20al Distribution
Front Panel Operation 21
Installation and Power 21
Navigating the Display 21
Main Displays 21
TIME / DATE 21
∆1 PPS 22
SATS / SNR 22
Alternate Displays 22
Position 22
Alarm 22
Timebase 23
Startup Displays 24
Timebase Status 24
USB Status 24
Error Reporting 25
GnssDO Application 25
Installation Requirements and Setup 25
Instrument Status 25
Configuration 26
Console 27
Configuration 29
Timebase Configuration 29
Lock to GNSS 29
Loop Bandwidth 29
Manual Loop TC 30
Criteria to Enter Holdover 30
Criteria to Leave Holdover 31
Wait for Good 1 PPS 31
Table of Contents iii
FS752 GNSS Time and Frequency Reference Stanford Research Systems
Jump to Good 1 PPS 31
Slew to Good 1 PPS 31
GNSS Receiver Configuration 32
Constellations Tracked 32
Timing Alignment 32
Timing Quality 33
Survey 34
Disabled 34
Redo Survey at Power On 34
Remember Survey Results 34
Position Fixes in Survey 34
Antenna Corrections 34
Local Time Offset 35
Alarm 35
Alarm Mode 35
Tracking Current Condition 35
La 35tch Alarm Condition
Manually Set State 36
Alarm Conditions 36
1 PPS Output 36
Time Offset 36
Factory Default Settings 37
Forcing Instrument Settings to Factory Defaults 37
Remote Programming 39
Introduction 39
USB 39
Virtual RS- 232 COM Port 39
Front 39-Panel Indicators
SCPI Command Language 40
SubSystems 40
Understanding Command Syntax 40
Keyword Case 41
Punctuation Used in Definitions 41
Examples 41
Queries 41
Separators 42
IEEE 488.2 Common Commands 42
Parameter Types 42
Numeric Values 42
Units 43
Discrete Parameters 43
String Parameters 43
Command Termination 43
Status Reporting 44
Architecture 44
Condition Register 44
Table of Contents iv
FS752 GNSS Time and Frequency Reference Stanford Research Systems
Event Register 45
Enable Register 45
FS752 Status 46
Serial Poll Status Byte 46
Standard Event Status Register 48
Questionable Status 49
Operation Status 50
GPS Receiver Status 51
Common IEEE-488.2 Commands 52
GPS Subsystem 57
Source Subsystem 63
Status Subsystem 64
System Subsystem 67
Timebase Subsystem 74
Error Codes 81
Command Errors 81
Execution Errors 82
Device Specific Errors 82
Query Errors 82
Instrument Errors 83
FS752 Circuit Description 85
Overview 85
Timebase and Oven 85
GNSS Receiver and Time Tagging 86
1 PPS Outputs 87
10 MHz Outputs 87
Microcontroller, Communications, and DACs 88
Power Supplies 88
Appendix A: Parts List 91
Appendix B: Schematic Diagrams 97
v Revisions
FS752 GNSS Time and Frequency Reference Stanford Research Systems
Revisions
Rev
Date
Changes
1.00
1/1/19
First release

Produktspecifikationer

Varumärke: SRS
Kategori: Inte kategoriserad
Modell: FS752

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