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Summary of Contents for Symmetricom 8040C
- Page 1 8040C/8040CLN Rubidium Frequency Standard User Guide Part Number: 15254-201 Rev. C, Jul 12, 2011...
- Page 2 Revision History Revision Date Change 12 July 2011 Added low phase noise option 8040CLN. 15254-201.docx Rev. C, 07/12/2011...
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Page 3: Table Of Contents
Table of Contents About this User Guide ..........................1 Purpose ........................... 1 Conventions ..........................1 Special Notices ............................2 Limited Product Warranty ........................ 3 Introduction ............................. 4 Overview ..........................4 Purpose of Equipment ........................... 4 Factory Configurations ........................4 Installation ............................... 5 Mounting ............................ - Page 4 Timing Outputs ............................13 Timing Inputs ............................. 13 Stability ............................. 14 GPS Disciplining ............................14 Aging ............................14 Warm-up Time ............................. 14 SSB Phase Noise ............................ 14 Environmental & Physical ........................ 14 General ..........................14 Remote System Interface and Control ..................15 AC Power Requirements ......................
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Page 5: About This User Guide
About this User Guide Purpose The 8040C/8040CLN User Guide describes the procedures for unpacking, installing, using, maintaining the 8040C/8040CLN. Conventions This guide used the following conventions: Acronyms and Abbreviations – Terms are spelled out the first time they appear in text. -
Page 6: Special Notices
Special Notices Warnings, Cautions, Recommendations, and Notes attract attention to essential or critical information in this guide. The types of information included in each are explained in the following examples. 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. -
Page 7: Limited Product Warranty
When a warranty claim is questioned or disallowed, Symmetricom will contact Buyer by telephone or in writing to resolve the problem. 2. Software - Symmetricom warrants that for a period of ninety (90) days from date of shipment by Symmetricom the accompanying media will be free from defects in materials and workmanship under normal use. -
Page 8: Introduction
1, 5 or 10 MHz square wave 1 PPS The 8040C uses Symmetricom’s model SA.22C Rubidium as its internal oscillator, and provides direct user control via an RS-232 to perform the following tasks: Adjust the SA.22C Rubidium oscillator frequency. -
Page 9: Installation
Rubidium oscillator is sensitive to DC and AC magnetic fields. Power Connection/Fuse/Voltage The Symmetricom 8040C is powered from an AC source or optionally from a 24VDC source. (See Power Requirements, page 15). The AC fuse is located inside the AC connector/filter on the rear panel. -
Page 10: Input Signals
The 1 PPS IN connector takes a 1 PPS input from an external source, such as a GPS receiver or Cesium frequency standard, which is then used to discipline the 8040C’s Rubidium oscillator. See Disciplining to External 1 PPS on page 8. -
Page 11: Operation
Operation Powering Up Connecting the power cord from the 8040C/8040CLN to the AC or DC source provides power to the unit. For the DC version, on the power cord apply: +24VDC on the red wire. Ground or return on the black wire. -
Page 12: Adjusting Oscillator Frequency
The traditional approach involved adding an external circuit to the oscillator that had a phase lock loop detector to handle disciplining algorithms. Symmetricom is a leader in time and frequency design and has pioneered the use of Rubidium oscillators in telecommunications. The model SA.22C Rubidium oscillator in the Symmetricom 8040C/8040CLN provides an important new feature –... -
Page 13: Operation
Operation Connect the 1 PPS source to the 1 PPS IN on the rear panel of the 8040C/8040CLN. The 8040C/8040CLN’s Symmetricom Synchronization Adaptive Algorithm (SSAA) qualifies the 1 PPS input reference by detecting 256 valid 1 PPS input pulses and determining the number of outliers based on the time constant. - Page 14 Figures 4 & 5: Dipswitch Locations for Configuring Outputs 15254-201.docx Rev. C, 07/12/2011...
- Page 15 3. Use the dipswitch positions shown in Table 4 to generate a specific output format on a specific BNC. For example, to generate 10 MHz TTL on BNC3, set SW3 position 1 to ON, position 2 to OFF, and position 3 to OFF. Table 4: Output Configuration Table Output Format Position 1 Position 2 Position 3...
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Page 16: Console
Console The Symmetricom Serial Interface Protocol (SSIP) provides user communication with the 8040C/8040CLN through the serial port when the unit is connected to a host PC or terminal. All “developer-mode” commands are single-letter format. Host Terminal Emulator Setup Set up the comm port of the PC with the following configuration: ... -
Page 17: Specifications
Specifications All performance is at an ambient temperature of 25°C (77° F) unless otherwise specified. Outputs Sine Wave Frequency 1MHz, 5MHz, & 10 MHz Amplitude 1V RMS < –40 dBc Harmonic < –60 dBc (< –80 dBc with Low Phase Noise option) Non Harmonic Connector BNC - Female... -
Page 18: Stability
Stability Standard Low Noise Averaging Time Allan Deviation Allan Deviation 1 sec. <3.0E-11 <1.5E-11 10 sec. <1.0E-11 <8.0E-12 100 sec. <3.0E-12 <2.5E-12 GPS Disciplining Time to lock </=1000 sec. Freq Accuracy +/-1E-12 1 PPS Accuracy +/-30 nS Aging Monthly <5E-11 (after 30 days of operation) Yearly <5E-10 Accuracy at... -
Page 19: Remote System Interface And Control
Remote System Interface and Control Protocol RS-232-C (DTE Configuration) Connector 9-pin female rectangular D subminiature type Location Rear panel Protocol 8 Data Bits Stop 1 Stop bit Baud Rate 57600 AC Power Requirements Voltage 90 to 240 VAC Frequency 47 to 63 Hz Power (Operating) 25W (Operating) Power (Warm Up) -
Page 20: Options
Options Introduction There are two optional configurations for the 8040C/8040CLN, the Twelve Output option and the Low Phase Noise option. The additional outputs require an additional circuit card that provides six configurable outputs that are set up the same as in the standard unit. -
Page 21: Technical Support
Europe, Middle East & Africa: 49 700 32886435 Preparation for Shipment Turn off the Symmetricom 8040C/8040CLN prior to shipment by removing the AC or DC power cord from the rear panel. Package the instrument in its original packing, if possible. -
Page 22: Index
Index 1 PPS Operation ..........Disciplining to ......... Options ..........1 PPS Sync Indicator ......Output Signals AC Power Requirements ....Outputs ..........13 Additional Outputs ......Configuring ......... Aging ..........Power ............ Command & Control ......Power indicator ........Conventions ........
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