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Rev. C, Jul 12, 2011

8040C/8040CLN Rubidium Frequency Standard

User Guide

Part Number: 15254-201

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Summary of Contents for 8040C

Page 1: ...Rev C Jul 12 2011 8040C 8040CLN Rubidium Frequency Standard User Guide Part Number 15254 201 ...

Page 2: ...15254 201 docx ii Rev C 07 12 2011 Revision History Revision Date Change C 12 July 2011 Added low phase noise option 8040CLN ...

Page 3: ...Installation 5 Mounting 5 Power Connection Fuse Voltage 5 Signal Connections 5 Output Signals 5 Input Signals 6 Console 6 Operation 7 Powering Up 7 Indicator LEDs 7 Adjusting Oscillator Frequency 8 Disciplining to External 1 PPS 8 1 PPS Disciplining 8 Operation 9 Manual Control 9 Automatic Control 9 Configuring Outputs 9 Console 12 Host Terminal Emulator Setup 12 Specifications 13 Outputs 13 Sine ...

Page 4: ...ime 14 SSB Phase Noise 14 Environmental Physical 14 General 14 Remote System Interface and Control 15 AC Power Requirements 15 Fuses 15 Dimensions 15 Options 16 Introduction 16 Twelve Output Option 16 Low Phase Noise Option 16 Technical Support 17 Maintenance 17 Customer Assistance 17 Preparation for Shipment 17 Index 18 ...

Page 5: ...page lists the printing date and versions of the product this guide describes Typographical Conventions This guide uses the typographical conventions described in the Table 1 below Table 1 Text Formats and Their Meanings Text that appears this way is Product User Guide A document title SSU CRITICAL An operating mode alarm state status or chassis label Select File Open A menu item to be selected by...

Page 6: ... the equipment 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 WARNING All warnings have this symbol Do not disregard warnings They are installation operation or maintena...

Page 7: ...ging of all returns Symmetricom will pay shipping costs to return repaired or replacement goods to Buyer Symmetricom reserves the right to disallow a warranty claim following an inspection of returned product 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 ...

Page 8: ...lowing frequency outputs 1 5 or 10 MHz sine wave 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 Syntonize tune the SA 22C to an external 1 PPS input Factory Configurations Part Number Description 15230 101 Six O...

Page 9: ...the AC connector filter on the rear panel To change the fuse open the cover on the rear panel AC connector by applying a screwdriver to the connector s cover slot Once the cover is open the fuse holder may be removed for inspection or replacement The Symmetricom 8040C 8040CLN may be powered from 90 or 240 VAC The 8040C automatically detects the input voltage therefore no manual configuration is re...

Page 10: ...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 Console The RS 232 connector on the 8040C 8040CLN s back panel provides a command line interface to perform the following tasks Adjust the Rubidium oscillator s frequency Synchronize to an external 1 PPS input Table 3 RS 232 Connec...

Page 11: ... power cord from the IEC receptacle on the rear panel turns the power off Indicator LEDs CAUTION Do not use the Symmetricom 8040C as a reference source until the LOCK indicator is turned on The three LED indicators on the front panel provide a cursory view of the 8040C 8040CLN operating status POWER is lit when AC or DC power is applied to the unit LOCK is lit when the unit s Rubidium oscillator r...

Page 12: ...will not be recorded 6 Response Tuning Data Save Disciplining to External 1 PPS 1 PPS Disciplining The advent of low cost GPS technology has brought about its widespread use throughout the telecommunications industry The GPS system provides 1 PPS with extremely good long term stability e g 1E 12 averaged over 24 hours However the short term stability of this signal is not suitable due to inherent ...

Page 13: ... solution yielding more control to the system designer is desired The manual mode requires the user to input two parameters which are tau or time constant and dampening factor Tau is expressed in seconds and determines the PLL time constant for following a step in phase for the reference The range of tau is 5 to 100 000 seconds Tau values outside of this range put the unit in automatic disciplinin...

Page 14: ...15254 201 docx 10 Rev C 07 12 2011 Figures 4 5 Dipswitch Locations for Configuring Outputs ...

Page 15: ...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 10 MHz Sine OFF OFF OFF 10 MHz TTL ON OFF OFF 5 MHz Sine OFF OFF ON 5 MHz TTL ON OFF ON 1 MHz Sine OFF ON OFF 1 MHz TTL ON ON Off 1 PPS ON ON ON 4 After setting the outputs replace the top cover and apply power ...

Page 16: ...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 Data rate Baud BPS see note below No parity 8 data bits 1 stop bit No local echo unit echoes No hardware or software flow control All SSIP commands are a single ASCII letter The baud rate of the 8040C 8040CLN is 57 6K Note Requires a null modem ...

Page 17: ...e Load Impedance 50 Ohms Location Rear Panel Square Wave Frequency 1MHz 5MHz 10 MHz Amplitude 3V Peak Format TTL Pulse Width 50 Duty Cycle Connector BNC Female Load Impedance 50 Ohms Location Rear Panel Timing Outputs Format 1 PPS Amplitude 3V Pulse Width 400 nS Rise Time 20 nS Jitter 10ps RMS Connector BNC Female Load Impedance 50 Ohms Location Rear Panel Timing Inputs Quantity 1 1 PPS Sync Input...

Page 18: ...Control Range 1E 6 with 1E 12 resolution Warm up Time Time to Lock 5 minutes Time to 1 E 9 8 minutes SSB Phase Noise Phase Noise Standard Low Noise Offset Hz 10 MHz Output 10 MHz Output 1 72 dBc 100 dBc 10 95 dBc 130 dBc 100 130 dBc 144 dBc 1 000 140 dBc 150dBc 10 000 148 dBc 150dBc Environmental Physical General Operating Temperature 0 C to 50 C 32 F 122 F Temperature Coefficient 3E 10 Storage Te...

Page 19: ...Requirements Voltage 90 to 240 VAC Frequency 47 to 63 Hz Power Operating 25W Operating Power Warm Up 45W Warm Up DC Power Requirements Voltage 18 to 36 VDC 24 Nominal Power Operating 25W Operating Power Warm Up 45W Warm Up Fuses AC Input TO 2 0A 250 V slow blow BUSSMAN GDC 2A LITTELFUSE 218002 DC Input TO 5 0A 250 V fast blow BUSSMAN GDB 5A LITTELFUSE 217005 Dimensions Height 1 75 1 UI 44mm Width ...

Page 20: ...elve Output option the six additional outputs on channels 7 through 12 come pre configured the same as channels 1 through 6 in the standard configuration They can be reprogrammed as described in Configuring Outputs page 9 Figure 6 Back Panel of 8040C 8040CLN with the Twelve Output Option Table 10 Output Connections BNC Signal 7 10 MHz Sine wave 8 10 MHz Sine wave 9 10 MHz Sine wave 10 5 MHz Sine w...

Page 21: ...e Centers Customer Assistance Center Telephone Numbers Worldwide Main Number 1 408 428 7907 USA Canada Latin America including Caribbean Pacific Rim including Asia Australia and New Zealand 1 408 428 7907 USA toll free 1 888 367 7966 1 888 FOR SYMM 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 po...

Page 22: ... Remote System Interface and Control 15 Dimensions 15 Shipment 17 Environmental Physical 14 Signal Connections 5 Frequencies 8 Sine Wave 13 Fuse 5 Special Notices 2 Fuses 15 Specifications 13 GPS Disciplining 14 Square Wave 13 Indicators 7 SSB Phase Noise 14 Input Signals 6 Stability 14 Installation 5 Technical Support 17 Limited Product Warranty 3 Terminal Emulator 12 Lock Indicator 7 Timing Inpu...

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