Summary of Contents for Symmetricom 5402
- Page 1 5401 Airborne Disciplined Rubidium Oscillator 5402 Disciplined Rubidium Oscillator Operating Manual Preliminary Rev. A, May 2005 PN 8500-0150...
- Page 2 The equipment or software described in this manual have been developed solely at the expense of Symmetricom 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.
- Page 3 By purchasing any product manufactured by Symmetricom, the buyer consents to and agrees with Symmetricom that as a result of the exclusion of all warranties, expressed or implied, of merchantability, fitness for purpose, or otherwise, except for the limited one-year...
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Page 4: Limitation Of Liability
Where to Find Answers to Product and Document Questions For additional information about the products described in this guide, please contact your Symmetricom representative or your local sales office. You can also contact us on the web at www.symmetricom.com. Warnings, Cautions, Recommendations, and Notes Warnings, Cautions, Recommendations, and Notes attract attention to essential or critical information in this guide. -
Page 5: Conventions Used In This Guide
Operating Manual Preface ESD Caution: To avoid personal injury and electrostatic discharge (ESD) damage to equipment, do not disregard ESD cautions. All ESD cautions use this symbol. ESD cau- tions are installation, operation, or maintenance procedures, practices, conditions, or statements that if not strictly observed, may result in possible personal injury, electro- static discharge damage to, or destruction of, static-sensitive components of the equip- ment. - Page 6 You must enter commands for STATUS case-sensitive operating systems exactly as shown. A re-timing application A word or term being emphasized. Symmetricom does not recom- A word or term given special emphasis. mend... PN 8500-0150, Rev. A, May 2005...
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Page 7: Table Of Contents
Symmetricom 5402 Initial Operation ........6 Symmetricom 5402 Adjustments ........6 3 —Operation... - Page 8 5402 Indicators (Front Panel) ........
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Page 9: Introduction
The DRO also has an RS232 I/O port that is used for setup, control, and to output the unit's status. Except for the power supplies, the 5401 and 5402 are electrically identical. The power and serial RS-232 connectors are different as are the signal input and output connectors. Refer to... -
Page 10: Symmetricom 5401 Airborne Disciplined Rubidium Oscillator
Symmetricom 5401 3-View Symmetricom 5402 Disciplined Rubidium Oscillator The Symmetricom 5402 is built in a standard rack mount configuration that is powered by commercial power anywhere in the world (85 to 264 VAC). The unit is designed to be installed in a standard 19-inch RETMA electronic enclosure. Chassis slides are recommended for support. -
Page 11: Installation
Note: regarding shipping damage, refer to the serial number. This number is located on the front panel of the 5401 and the rear panel of the 5402. Symmetricom 5401 Installation Procedure Install the unit in the desired location and connect the unit to its power source. Refer to Chapter 4 for specifications and connector pin assignments. -
Page 12: Symmetricom 5401 Adjustments
RAM when the unit was last powered-down. Symmetricom 5401 Adjustments The amplitude of each of the 10 MHz outputs can be individually adjusted with potentiometers located on the 3-Channel Distribution Amplifier (Assembly 35039). -
Page 13: Symmetricom 5402 Rack Mounting Procedure
The chassis slides attach to the sides of the 5402. To mount the slides, use six # 8/32 screws, 1/2 inch long (three on each side). -
Page 14: Symmetricom 5402 Installation Procedure
(resonance). The 10 MHz outputs are now stable for use. Disciplining of the Rubidium oscillator will begin once 1 PPS input is present. The 5402 is now operational and will begin to discipline the Rubidium using the control parameters that were previously stored in battery-backed RAM when the unit was last powered-down. -
Page 15: Rs-232 Input/Output
J14 RS232 on the 5401, and using a DB15 connector designated as J3 on the 5402. This serial port can be used to communicate with the DRO from a computer or a 'smart terminal.' All communication is in the ASCII format. The standard character protocol is 9600 BAUD, one start bit, eight data bits, none for parity, and one stop bit. -
Page 16: Status Request
Operating Manual Operation Table 1 DRO Commands Via RS-232 Status Request Command Format: PN 8500-0150, Rev. A, May 2005... -
Page 17: Discipline Off
Operating Manual Operation Description: Rx - Rubidium lock; x=0 not Locked, x=1 Locked Dx - Discipline On/Off; x=0 discipline off, x=1 discipline on Px - 1 PPS input present; x=0 not present, x=1 present Vx - Valid 1 PPs; x=0 unstable, x=1 stable. Time change in the 1 PPS is less than the rate threshold. -
Page 18: Discipline On
Operating Manual Operation Response Format: Discipline On Command Format: Description: The oscillator discipline is turned on. When the conditions are favorable, the discipline algorithm will control the oscillator. Response Format: Dynamic Gain Control Command Format: Description: The dynamic gain value determines the response time of the control loop. This command sets the upper and lower limit. -
Page 19: Enter Km
Operating Manual Operation Dynamic Gain Time Constant 90 minutes 70 minutes 45 minutes 35 minutes 17 minutes 11 minutes Response Format: Enter KM Command Format: Description: kkkkkk - Base number for Km; kkkkkk (000000 to 999999) represents a number from 0 to 0.999999. -
Page 20: Enter Disgain
Operating Manual Operation Description: nnnnnn - Base number for Ko1; nnnnnn (000000 to 999999) represents a number from 0 to 0.999999. Ko1 controls the cut off frequency of the offset error noise filter. oooooo - Base number for Ko2; oooooo (000000 to 999999) represents a number from 0 to 0.999999. -
Page 21: Enter Resync Delay
Operating Manual Operation Enter Resync Delay When the 1 PPS In is lost or becomes invalid (rate threshold is exceeded), the unit is placed into a holdover mode. It remains in this mode until the 1 PPS In is valid for a time period (in seconds) determined by "Resync Delay". -
Page 22: Burst Status On
Operating Manual Operation Burst Status On Command Format: Description: Status will be output every second. Response Format: Burst Status Off Command Format: Description: Turns burst status off. Response Format: No Response. When burst is on. When burst is off: PN 8500-0150, Rev. A, May 2005... -
Page 23: Request Ti
Operating Manual Operation Figure 5 DRO Discipline Sequence Flowchart Request TI Command Format: PN 8500-0150, Rev. A, May 2005... -
Page 24: Enter Dac Value
Operating Manual Operation Description: Ttttttt.ttt - Time Interval; tttttt.ttt is the time interval (0 to 999999.999 microseconds) of the last 1 PPS event. Sssssss.s - Seconds Counter; ssssss.s is the second count (0 to 999999.9 seconds) since the unit has been turned on. The count will roll over to zero when maximum is reached. Response Format: Enter DAC Value Command Format:... -
Page 25: Enter Start-Up Parameters
Operating Manual Operation r - Revision Letter of Firmware. Response Format: Enter Start-up Parameters Command Format: Description: n - Start-up Index; n (1 to 6) selects which one of 6 elements in the start-up table that will be modified. gg.g - Dynamic Gain Value; gg.g (0 to 99.9) represents the dynamic gain value that will be used during start-up for element "n". -
Page 26: Calibrate Unit
Operating Manual Operation Response Format: Description: Nn - Start-up Index; n (1 to 6) identifies which one of 6 elements in the start-up table was reported. Ggg.g - Dynamic Gain Value; gg.g (0 to 99.9) represents the dynamic gain value that will be used during start-up for element "n". -
Page 27: Set Defaults
Operating Manual Operation Set Defaults Command Format: Description: Returns the unit to a default state. Table 2 Default Values Parameter Default Value Discipline Dynamic Gain Floor Dynamic Gain Ceiling Dynamic Gain Rate Factor 0.0005 ns Dynamic Gain Offset Factor 5.0 ns 0.99997 0.99984 0.99984... -
Page 28: Enter 1 Pps Offset (Not Implemented)
Operating Manual Operation Note 1: Start-up Parameters Dynamic Gain Time 1140 1740 2760 Response Format: Enter 1 PPS Offset (not implemented) Command Format: Description: yyyyyy.yyy - 1 PPS Offset; yyyyyy.yyy (0 to 999999.999 microseconds) is amount of extra delay applied to the 1 PPS output. It is added to the unit zero point and the resync side load value. -
Page 29: Input Threshold High/Low
Operating Manual Operation Description: Table 3 is a list of the data found in the response. The data is in the same format as the associated "Enter" command. A space exists between each of the parameters, except where noted. The total count is 176 characters. Table 3 Response Format Variable Return String... -
Page 30: Enter Programmable Delay Value
Operating Manual Operation Description: The input 1 PPS can be sliced at two deferent levels. This command selects which slicing level is used. x=0 - High 5 volt input threshold, x=1 - Low 2.5 volt input threshold. Response Format: Enter Programmable Delay Value Command Format: Description: The yyy is a number from 000 to 255. -
Page 31: Design Verify On/Off
Operating Manual Operation The srr.rrrr is a number from -99.9999 to +99.9999 microseconds per second. The number is frequency change from DAC = 00000 to 65535 of the unit. This number is used in the discipline algorithm to help compensate for oscillators with different frequency Note: It is assumed that the DAC output and oscillator control are linear. -
Page 32: Cal Status
Operating Manual Operation Cal Status Command Format: Description: Cx - Calibration status: x = 0 not doing a calibration. x = 1 calibration in progress. x = ? last calibration failed (no 1 PPS, cable missing, noisy 1 PPS, or wrong 1 PPS). Response Format: Enter Estimation Filter Time Constant Command Format:... -
Page 33: Enter Dynamic Gain Factors
Operating Manual Operation Enter Dynamic Gain Factors Command Format: Description: Rrr.rrrr - Rate Factor; the normalizing value (in nanoseconds) for rate when calculating the next dynamic gain. Oooo - Offset Factor; the normalizing value (in nanoseconds) for offset (TI) when calculating the next dynamic gain. -
Page 34: Input Specifications And Characteristics
Input Voltage 5401: DC = +18 V to 36 VDC, MIL-STD-704 < 80 W (warmup) < 40 W (steady-state) 5402: AC = 90 to 240 VAC (47-440 Hz) < 80 W (warmup) < 40 W (steady-state) 3 amp fast blow, Microfuse... -
Page 35: Output Specifications And Characteristics
5401 RS-232 Input/Output Type 5401 Connector Pin Assignments: Function Chassis Ground Transmitted Data Received Data Signal Ground 5-13 Not Used 5402 RS232 Input/Output Type 5402 Connector Pin Assignments: Function Transmitted Data Received Data Signal Ground DRO RS-232 Parameters: 9600 Baud... - Page 36 5401: Isolated SMA (J7-J12) DRO 10 MHz Output Type 5402: Isolated SMA (J10-J15) The DRO outputs 10 MHz signals with the following characteristics (After a 30 minute warm-up at an ambient temperature of 25ºC): 1.6 to 3.0 volts peak-to-peak (adjustable) Level 50Ω...
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Page 37: 5401 Indicators (Front Panel)
Power (LED) Figure 6 Indicates Rubidium Locked status (see Lock (LED) 5402 Indicators (Front Panel) Table 7 5402 Indicators (Front Panel) Figure 7 Indicates power applied to the unit (see Power (LED) DRO Internal Time Bases Table 8 DRO Internal Time Bases... -
Page 38: 10 Mhz Oven Oscillator
Operating Manual Specifications Table 8 DRO Internal Time Bases (Continued) Spurs: 50 dBc Harmonic 90 dBc Non-Harmonic +19 to +32 VDC Input Voltage Range 13 watts @ 25ºC (+24 VDC) Input Power (Quiescent) 10 MHz Oven Oscillator Table 9 10 MHz Oven Oscillator 10 MHz sine wave Output Waveform 0.5 VRMS into 50... -
Page 39: 5401 Dimensions
Operating Manual Specifications 5401 Dimensions Figure 6 5401 Mounting Dimensions 5401 Weight Approximately 8 pounds. 5402 Weight Approximately 10 pounds. PN 8500-0150, Rev. A, May 2005... -
Page 40: 5402 Dimensions
5402 Dimensions 1.75 inches Height 17 inches (19 inches with mounting ears) Width 12 inches Depth Figure 7 5402 Front Panel Figure 8 5402 Rear Panel Environment –20ºC to +50ºC DRO Operating Temperature 95% (non-condensing) up to 50ºC DRO Operating Humidity...