Manual
Contents
1. Bits set bitO TCXO tune voltage OK Bitl Rubidium locked Bit2 GPS time valid not in holdover is PLL control Bits set bitO 1 2 3 subsample rate bit4 5 6 7 exp filter order bit8 9 10 11 integrator gain bit12 13 14 15 proportional gain 1s reference tune span 1s OCXO current filtered Write new test status byte Write new lock status byte E8000 Series AS Manual 9 Oetober 2008 Page IL of 12 Quartzlock Model E8000 Series Operation Manual OSGdddd Write new PLL control OSSee Write new reference tune span PL Phase lock loop PL Returns current status of PLL aaaa bbbb cccccccc dddd eeee aaaa last value of I sample filtered 2s complement 16 bit bbbb last value of Q sample filtered 2s complement 16 bit ceccccce last value of PLL integrator 32 bit integer dddd coarse tune DAC 16 bit integer eeee fine tune DAC 16 bit integer PLIccccccce Write new PLL integrator PLCdddd Write new coarse tune DAC PLFeeee Write new fine tune DAC PL Enter command PL into repeat stack PD Phase detector PD Returns phase detector parameters aaaa bbbb cccc dddd eeee aaaa Last phase result 2s complement bbbb Last mod I mod Q ccce 2 5V reference filtered dddd mod phase result filtered Isb 3 05ps eeee mod freq offset filtered Isb 2 33E 14 PD Write PD to command repeat stack EU EEPROM Update backed up values SR__ Software Reset ER EEPROM read ERCaabb Returns bb bytes from starting address aa2. GPS 9 6kbaud Motorola binary format INTERFACE CODES See Appendix B TIME DOMAIN STABILITY 1OMHz output Tau Allen variance E8000 E8010 Is 5x10 5x10 10s ino 3x10 100s 4x10 2x10 1000s 8x10 1x10 gt 10000s 5x10 1x10 JITTER 1PPS output Typical lt Sns RMS E8000 Series A5 Manual 9 October 2008 Page 8 of 12 Phase Noise 1Hz 10Hz 100Hz 1 kHz 10 kHz WARMUP E8000 69dBc 98dBc 120dBc 130dBc 140dBc lt 25 minutes to specified accuracy E8000 Series A5 Manual 9 October 2008 Model E8000 Series Operation Manual E8010 100dBc 120dBc 140dBc 145dBc Page 9 of 12 Quartzlock Model E8000 Series Operation Manual Appendix A Board set up Links SP1 Leave open circuit Used to upload new firmware to the CW25 GPS module SP2 Leave open circuit for 3 3V antenna power Link default for 5V antenna power SP3 Link only when 5V OCXO is fitted SP4 Leave open circuit when U5 enhanced voltage reference is used Link when US is not fitted to board JP2 5 7 fit all jumpers with shorting links for normal operation Links must be removed when programming US from the Microchip ICD 2 programmer U5 should be powered from the programmer when programming This is necessary as U5 cannot be programmed with 3 3V Vdd JP6 Link for normal operation Tune Voltage Span The tune voltage span should be set using the microcontroller interface to suit the tuning range of the controlled oscillator
3. The microcontroller interface allows setup and debug of the digital phase lock loop which locks the 20MHz reference oscillator to the GPS receiver The list of control codes is given in an appendix The only user adjustable parameter is the PLL bandwidth which is accessed with command UA The band width has been factory set to optimum for the E8 X TCXO and the E8 Y OCXO It is only recommended that the user adjusts these values if he is able to measure Allen variance of the 10MHz output at averaging times between 1 and 1000 seconds UA will return the current bandwidth 0 to 7 with 0 the narrowest bandwidth The second parameter hex is the elapsed running time in units of 2 33 hours E8000 Series A5 Manual 9 October 2008 Page 7 of 12 Quartzlock Model E8000 Series Operation Manual Specifications OUTPUTS Sine wave 10MHz 10dBm 2dBm into 50ohms Harmonics lt 30dBc Spurii lt 75dBc TTL 3 3VCMOS I pulse per second POWER SUPPLY 90 to 250V AC 250mA 500mA DPLL tracking bandwidths 10uHz to 1mHz typical in 8 binary increments Default 20mHz LOCK INDICATOR On not locked Off locked low phase error Short flash every second locked high phase error GPS INDICATOR Green indicates no of satellites used in time solution Amber indicates no of satellites tracked but not used in time solution INTERFACE Shared between DPLL and GPS receiver DPLL 9 6kbaud RS232 PC compatible Sbits no parity no handshake
4. automatically update its information when started In particular the TRAIM algorithm will be shown as off when in fact it is by default on in the receiver For the receiver to operate correctly the site survey must be enabled and the TRAIM must be on If this is not the case the receiver will track satellites and compute a fix but the red lock LED will not go out showing the 1OMHz output is in the standby state If the receiver gets stuck in a state where it does not lock the user may inadvertently disabled the TRAIM or the site survey To get back to a known state the following should be performed The messages can be sent using the message window in the WinOncore software Return to factory default state Cf Enable Position Auto survey consult the CW12 user manual for further details Gd03 Enable T RAIM algorithm consult the CW12 user manual for further details Gel 1 Set the alarm threshold for the T RAIM algorithm 300ns See the CW12 user manual for further details Gf300 Request channel T RAIM status message sent every second Hn01 If required the position status data message may be turned on Ha01 E8000 Series A5 Manual 9 October 2008 Page 6 of 12 Quartzlock Model E8000 Series Operation Manual If required the visible satellites message may be switched on Bb01 The GPS receiver stores the current status in non volatile memory when switched off Microcontroller Interface
5. 0 1seconds for a further 10 minutes as the PLL settles The normal operating condition is with the red lock LED off The status of the satellite tracking is shown by the green and amber LEDs The normal situation is that the green LED shows a long flash followed by a number of short flashes The number of short flashes shows the number of satellites being tracked and included in the time solution The amber LED may also flash This shows the number of satellites being tracked but not included in the timing solution If the red lock LED should start to flash flash of 0 1seconds at about 1Hz rate this indicates that the phase error between the GPS signal and the reference oscillator is greater than a pre programmed threshold This does not indicate that the 1OMHz output is unlocked During normal operation the GPS receiver estimates the accuracy of the timing solution using the TRAIM algorithm Time Receiver Autonomous Integrity Monitoring developed for the Motorola Oncore receiver If the predicted timing error is greater than the programmed limit the receiver will switch into holdover mode and the red lock LED will start to flash at a 2Hz rate with equal mark space ratio i e on for 1 second off for 1 second The 10MHz output and 1pps output will then drift according to the ambient temperature and aging of the rubidium oscillator When the GPS receiver E8000 Series A5 Manual 9 October 2008 Page 5 of 12 Quartzlock Model E8000 Serie
6. For detailed procedure please refer to manufacturer E8000 Series A5 Manual 9 October 2008 Page 10 of 12 Appendix B Model E8000 Series Operation Manual RS232 control codes All values following command or returned from the microcontroller are hexadecimal backed up in EEPROM UA _ User adjust UA aa sl bbbb cecce UABaa UAScccc Returns user parameters aa bbbb cccc is bandwidth control bits set bitO 1 2 bandwidth 0 to 7 is clock registers 3 and 4 elapsed time is maximum slew rate of tuning voltage Write new bandwidth control byte write new maximum slew rate OS Overall Status OS E aa bb cc dddd a ee ffff OSTaa OSLbb Returns overall status bytes aa bb cc dddd ee ffff is test status byte Bits set bitO 1 2 bits 0 to 2 DAC output select bit3 no integrator update bit4 no proportional term bit5 Inhibit holdover mode bit6 NU bit7 inhibit state control Bits 2 1 0 000 no test output fine tune DAC used for tuning 001 sub sampled I 010 sub sampled Q 011 PLL Integrator upper 16 bits 100 Phase result 101 I sample filtered 110 Q sample filtered 111 references CH6 filtered is lock status byte Bits set bitO to 2 State control states 0 to 7 bit3 set to normalise tuning DACs cleared automatically bit4 OCXO warmed up bit5 Loop locked bit6 narrow range phase detector in use bit7 set to inhibit auto load of PLL gain parameters is second lock status byte
7. MODEL E8000 SERIES GPS Timing amp Frequency Standard Quartzlock UK Ltd Gothic Plymouth Road Totnes Devon TQ9 5LH England Tel 44 0 1803 862062 Fax 44 0 1803 867962 Web www quartzlock com E mail quartzlock quartzlock com E8000 Series A5 Manual 9 October 2008 Model E8000 Series Operation Manual USER S HANDBOOK Page 1 of 12 Quartzlock Model E8000 Series Operation Manual Contents Safety Considerations di sa 3 Voltage Frequency and Power Characteristics ccccceeeeeeeeeeeeeeeeeeeeeeeeeeeesseeeeeeeeeees 4 Environmental ConditiOnS cositas cocodrilos ist idas ita 4 Replaceable Fusing Characteristics oooononnnnncccnccnnnnnccnconnncncnnncnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnos 4 Cleaning Instructions sete atlas cintia tin EA DEAD A ART ADD asim tiie 4 E8 Series GPS Timing amp Frequency Reference ooooooocccccccccccccocononcccnccnnoncnnnnnnnnnncnnnnnnnnnnnnnnns 5 INFOQUEION scsi io 5 A A 5 Opera ua ia 5 Interface and programming ye ssessccncsorssnecessaucnnsdcaiadedenectesneaanecsdsmedttecendeedsdepedieedaumscsdsniednds 6 GPS MR AAA A A 6 Specification A A e 8 OUTPUT Sota ia 8 Po ata de ened bie aid dew ane ened ne enema 10 Board Set E 10 APPENA Birsin oaa eE E E E E E A E E E E E ee 11 Pree COMO Code oa 11 E8000 Series AS Manual 9 October2008 sia 2 OF 12 Quartzlock Model E8000 Series Operation Manual Safety Considerations General This product and related d
8. as ASCII characters ERNaabb Returns bb bytes from starting address aa as hexadecimal numbers character pairs EW EEPROM write EWCaabbccccc c Writes bb characters to starting address aa Correct number of characters must be included in string EWNaabbcccc c Writes bb bytes to starting address aa Character pairs cc etc are interpreted as hexadecimal numbers RI Repeat Interval RI Returns command repeat interval aa aa 8 bit command repeat interval multiplier Range 1 to 255 Command repeat interval is 50ms x aa RIOaa Write new command repeat interval RID Cancel command repeat and clear command repeat stack E8000 Series A5 Manual 9 October 2008 Page 12 of 12
9. not perform such adjustments or servicing unless qualified to do so WARNING Any interruption of the protective grounding conductor inside or outside the instrument or disconnecting of the protective earth terminal will cause a potential shock hazard that could result in personal injury Grounding one conductor of a two conductor out let is not sufficient protection Whenever it is likely that the protection has been impaired the instrument must be made inoperative and be secured against any unintended operation If the instrument is to be energised via an autotransformer for voltage reduction makes sure the common terminal is connected to the earthed pole terminal neutral of the power source Instructions for adjustments while the covers are removed and for servicing are for use by service trained personnel only To avoid dangerous electrical shock do not perform such adjustments or servicing unless qualified to do so E8000 Series A5 Manual 9 October 2008 Page 3 of 12 Quartzlock Model E8000 Series Operation Manual For continued protections against fire replace the line fuse s with fuses of the same current rating and type for example normal blow time delay Do not use repaired fuses of short circuited fuse holders Voltage Frequency and Power Characteristics AC Power Adaptor Voltage 100 240V AC Frequency 40 50Hz Power characteristics SO0MA Max Voltage 12V de 300mA 500mA Environmental Conditio
10. ns Temperature Operating ambient 10 C to 55 C 65 to 65 op Storage 40 C to 85 C Magnetic Field Sensitivity lt 2x10 Gauss Atmospheric Pressure 60m to 4000m lt 1x10 mbar Replaceable Fusing Characteristics N A Cleaning Instructions To ensure long and trouble operation keep the unit free from dust and use care with liquids around the unit Be careful not to spill liquids onto the unit If the unit does get wet turn the power off immediately and let the unit dry completely before turning it on again Clean with a damp with water cloth Never spray cleaner directly onto the unit or let liquid run into any part of it Never use harsh or caustic products to clean the unit E8000 Series AS Manual 9 OetoBer 20 Page of 12 Quartzlock Model E8000 Series Operation Manual E8 Series GPS Timing amp Frequency Reference Introduction The GPS clock is shipped ready for operation No adjustments are needed to have a 1OMHz frequency reference and 1 pulse per second time reference within 20 minutes of initial switch on The status of the GPS lock is shown on four LEDs on the front panel For more information as to satellite signal strengths etc a computer with RS232 may be connected to the interface A freeware program such as WinOncore may be used to display information from the GPS receiver Installation The antenna should be installed preferably with a 360 degree view of the sky The GPS receiver use
11. ocumentation must be reviewed for familiarisation before operation If the equipment is used in a manner not specified by the manufacturer the protection provided by the instrument may be impaired Before Applying Power Verify that the product is set to match the available line voltage and the correct fuse is installed Before Cleaning Disconnect the product from operating power before cleaning WARNING Bodily injury or death may result from failure to heed a warning Do not proceed beyond a warning until the indicated conditions are fully understood and met CAUTION Damage to equipment or incorrect measurement data may result from failure to heed a caution Do not proceed beyond a caution until the indicated conditions are fully understood and met This equipment must be earthed An uninterruptible safety earth ground must be maintained from the mains power source to the product s ground circuitry WARNING When measuring power line signals be extremely careful and use a step down isolation transformer whose output is compatible with the input measurement capabilities of this product The product s front and rear panels are typically at earth ground Thus never try to measure AC power line signals without an isolation transformer WARNING Instructions for adjustments when covers are removed and for servicing are for use by service trained personnel only To avoid dangerous electrical shock do
12. s Operation Manual comes out of standby the 1PPS output will immediately revert to full accuracy The 1OMHz output may require a period to settle The unit should never go into holdover during normal operation The most likely reason for doing so 1s a poor antenna location Interface and programming The unit has one RS232 compatible interface This is shared between the GPS receiver and the microcontroller that locks the 1OMHz output to the GPS signal On Initial switch on the interface is connected to the microcontroller If no valid interface code is received within 30 seconds the interface switches over to the GPS receiver If a valid interface code is received the interface remains connected to the microcontroller until the next power on reset GPS interface The GPS receiver interface uses Motorola binary format In order to use this a freeware program such as WinOncore should be installed on the user s PC Connect the unit to the PC and start the program It may be necessary to set the port and baud rate 9600 The receiver is preset to output 3 sentences on a continuous basis These are Ha position status data Hn 12 channel TRAIM status message and Bb Visible satellites The various windows available from the program should show current satellite data etc It is important to note that some parameters shown by the program will not correctly indicate the actual state of the receiver This is because the program does not
13. s the Motorola TRAIM algorithm and after the site survey uses all the tracked satellites to calculate the time solution If the TRAIM limit is exceeded set by default to 300ns the receiver will go into holdover Thus the best possible antenna positioning should be used The receiver is very sensitive and will give good results with the antenna on a window ledge or even inside a building however if the holdover state occurs the antenna position should be improved The satellite signal strengths may be checked after installation using a computer with suitable software connected to the RS232 interface Operation The unit is fully programmed to operate without adjustment anywhere in the world The GPS receiver is held in reset until the rubidium reference has warmed up and locked During this time the GPS LEDs green and amber will be off After about 5 minutes the GPS receiver will start looking for satellites It will take about 1 minute to obtain a fix from a cold start with unknown location The receiver then does a site survey for about 15 minutes averaging the positions obtained After the site survey is complete the receiver switches to position hold mode and uses all the satellites available to improve the accuracy of the time calculation At this point the unit will start to lock its rubidium reference oscillator to the GPS signal This will take up to 30 minutes When the PLL locks the red lock LED should go out but may flash flash of
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