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Summary of Contents for 151-600

Page 1: ...ized and idle equipment along with credit for buybacks and trade ins Custom engineering so your equipment works exactly as you specify Critical and expedited services Leasing Rentals Demos In stock Re...

Page 2: ...Model XL DC Serial Number__________________ September 15 1997 Revision E...

Page 3: ...th the limits for a Class A digital device pursuant to Part 15 of the FCC Rules These limits are designed to provide reasonable protection against harmful interference in a commercial installation Thi...

Page 4: ......

Page 5: ...ecified overall lengths of the Antenna DownConverter Units are therefore increased by approximately 11 25 inches when the mounting nipple is included Antenna DownConverter Weight 0 60 lb 272 Kg Includ...

Page 6: ...by approximately 11 25 inches when the mounting nipple is included Antenna Weight 0 55 lb 250 Kg Including mtg nipple Antenna Cable RG 59 Standard length 50 ft 1 2 lb 545 Kg Optional Antenna Cable RG...

Page 7: ...ating temperature of 50 C LITHIUM BATTERY Part number 350 019 is a lithium battery CAUTION DANGER OF EXPLOSION IF BATTERY IS INCORRECTLY REPLACED REPLACE ONLY WITH THE SAME OR EQUIVALENT TYPE BATTERY...

Page 8: ...e references in the text of this manual to schematic drawings TrueTime s general policy is to not include schematics because they may contain proprietary information If you require copies of any schem...

Page 9: ...on XIII Disciplined Rubidium Oscillator Manual Section XIV Disciplined High Stability Quartz Oscillator Manual Section XV Low Phase Noise Output s Manual Section XVI Disciplined Quartz Oscillator Manu...

Page 10: ...32 1 5 OR 10 MHz OUTPUT S OPTION 1 33 1 kPPS OUTPUT OPTION 1 34 SLOW CODE OUTPUT OPTION 1 35 PRECISION 60PPS OUTPUT OPTION 1 36 ALARM OUTPUT OPEN COLLECTOR OPTION 1 37 PROGRAMMABLE PULSE OUTPUT OPTION...

Page 11: ...16 1 SERIAL PORT EMULATION COMMANDS 3 116 2 MODE C CONTINUOUS TIME ONCE PER SECOND 3 116 3 MODE F FORMAT THE TIME MESSAGE 3 116 4 MODE R RESET TO DEFAULT AND MODE C 3 116 5 MODE T TIME ON REQUEST 3 11...

Page 12: ...UNCTION F15 EXCLUSIVE USE ENABLE 3 217 SERIAL FUNCTION F17 SLOW CODE SETUP OPTION 3 218 SERIAL FUNCTION F18 SOFTWARE VERSION REQUEST 3 226 SERIAL FUNCTION F26 PROGRAMMABLE PULSE OUTPUT OPTION 3 228 SE...

Page 13: ...ION DOCUMENTATION XI PARALLEL BCD TIME OUTPUT OPTION XII IEEE 488 INTERFACE OPTION XIII FTM FREQUENCY AND TIME DEVIATION MONITOR OPTION XIV DISCIPLINED RUBIDIUM OSCILLATOR OPTION XV DISCIPLINED HIGH S...

Page 14: ...v R RE EV V E E XXV FIBER OPTIC LINK OPTION XXVI CODE OUTPUT OPTION XXVII NTS XL NETWORK TIME SERVER OPTION XXVIII PTTI INTERFACE OPTION XXXIX N8 FREQUENCY SYNTHESIZER XXX NETWORK INTERFACE CARD XXXI...

Page 15: ...re not obstructed Whenever entered position information is less accurate than 10 m the XL DC will first have to accurately ascertain its antenna position by tracking four or more satellites and perfor...

Page 16: ...t is used 4 the consistency of quality and quantity within each unit of product or products and among all units involved 5 the adequacy of containers packaging and labeling of the product or products...

Page 17: ...Antenna and Antenna Down Converter Units are therefore increased by approximately 11 25 when the mounting nipple is included XL DC Receiver Weight 7 0 lb max 3 175 kg Antenna Weight 0 70 lb 0 318 kg I...

Page 18: ...ifications are valid when the antenna s geodetic position is known within 10 m in WGS 84 and four or more satellites are being tracked under the current conditions of Selective Availability SA as expe...

Page 19: ...lution 6 x 10 11 1 second interval Accuracy 3 x 10 12 Stability Same as Frequency Timing Stability 1 15 INTERFACE SPECIFICATIONS The standard serial data port is a bidirectional EIA standard RS 232C i...

Page 20: ...te Pulse width 20 s On time edge Rising Amplitude TTL Levels into 50 Drive ACMOS 1 22 IRIG B OUTPUT STANDARD An IRIG B Amplitude Modulated 1 kHz carrier output is connected to a rear panel BNC connect...

Page 21: ...duty cycles of the output waveforms are 50 The rising edges of these signals coincide with the rising edge of the 1 PPS output to within 100 ns Rate 1 MPPS 5 MPPS or 10 MPPS Waveform Square Wave Ampli...

Page 22: ...t option is connected to a rear panel BNC connector It is intended to be a frequency source for driving a synchronous motor through a power amplifier This option would allow a drum recorder to be kept...

Page 23: ...r control voltage range either 5 to 5 VDC or 0 to 10 VDC refer to 87 6XX configuration drawing JP5 The output impedance is 100 Refer to Keypad and Serial Functions 07 and 14 for configuring the XL DC...

Page 24: ...le at 1 k or 50 and should be user specified refer to 87 6XX configuration drawing JP7 factory default 50 The rising edge of the pulse is measured with respect to the XL DC time to 30 ns Refer to Keyp...

Page 25: ...A copy of the RS 232 Standard is available from Electronic Industries Association Engineering Department 2001 Eye Street N W Washington D C 20006 This reference is suggested for any user of this syst...

Page 26: ...command to release it or until the unit loses power At power on or when exclusive use is off any port or the front panel has free access When a port has exclusive use the front panel keypad and all ot...

Page 27: ...X...

Page 28: ...1 0 amp slow blow The instrument is shipped configured with the 1 0 amp fuse installed With main power switch to the XL DC off connect an appropriate AC or DC power source to the XL DC receiver via th...

Page 29: ...lator input signal conditioning circuits The recommended connection method is as follows 1 Provide a single ground path between the XL DC and the External Oscillator 2 Let that single ground provide t...

Page 30: ...oducts however some differences exist The three most used functions TIME STATUS and POSITION have been assigned to front panel pushbuttons All remaining functions may be accessed via the front panel k...

Page 31: ...graphs describe some of the possible events which affect satellite acquisition times Note that satellite visibility at the receiver site will affect acquisition times If the Time and Frequency receive...

Page 32: ...erage and the GPS core receiver Non Volatile Random Access Memory NVRAM and then begins a satellite search Since invocation of AUTO mode does clear the average position the time and frequency outputs...

Page 33: ...fixes providing an increasingly more accurate and stable time and frequency reference position The quality of the timing and frequency outputs will improve until a terminal average of approximately tw...

Page 34: ...receiver and antenna during the last power off period If the XL DC determines that it has been moved by more than 1 km it will automatically set itself into the AUTO mode of operation Up to six satel...

Page 35: ...ish when the clock has confirmed correct day of year hour minute and second and the 1 PPS output is within specifications This annunciator will reappear whenever satellite lock is lost or measured tim...

Page 36: ...king status on the alphanumeric display If the clock is not tracking satellites the display will show STATUS looking for Satellites If the clock has acquired a satellite but has not yet acquired satel...

Page 37: ...entry A STATUS TIME or POSITION should be on the alphanumeric display before starting a function If not press the STATUS button B It takes several seconds for some functions to appear If nothing happe...

Page 38: ...Last Entry 05 Time Quality Enable Setup On Last Entry 06 Keypad Lockout Enable Off Last Entry 07 External Oscillator Enable Off Last Entry 13 Worst case Time Error Request 14 Ext Osc Parameter Entry...

Page 39: ...s The help function can be exited without invoking a function by pressing the TIME STATUS or POSITION buttons 3 101 KEYPAD FUNCTION 01 TIME ZONE ENTRY REQUEST Use Function 01 to enter the time zone of...

Page 40: ...arrow keys to move the cursor beneath the digit that you wish to change Press the up or down arrow keys to scroll through the possible choices Alternately directly enter the numbers using the keypad...

Page 41: ...ress the up or down arrow keys to toggle between 1 and 2 stop bits When the display shows the desired choice press FUNC ENTR to enter all Serial Port parameters 3 105 KEYPAD FUNCTION 05 TIME QUALITY E...

Page 42: ...e current value Using the same combination of arrow keys and direct digit entry when the display shows the desired value for the third time quality threshold press FUNC ENTR and the display will show...

Page 43: ...t yet acquired valid time or Time error 00 000 000 200 if the unit is tracking satellites and has acquired valid time If the XL DC acquired valid time but subsequently lost lock to the satellite signa...

Page 44: ...as been set press FUNC ENTR The display will show Ext Osc TEMP STAB 5 00e 10 Using the same combination of arrow keys and direct digit entry set the 0 to 60 C temperature stability of the external osc...

Page 45: ...ks Therefore most Serial programs written for use with these earlier models may be used with the current Mark III When the emulation is enabled or disabled the Serial Port and the IEEE 488 port will b...

Page 46: ...ult to Mode C 3 116 2 MODE C CONTINUOUS TIME ONCE PER SECOND Use Mode C to set the Serial Port to output the time message once each second Mode C is the power up default To request Mode C send the ASC...

Page 47: ...racters for minutes C4 character that will be transmitted between the seconds and milli seconds mmm three characters for milliseconds Q single character for the time quality If an X is used as a chara...

Page 48: ...ave the time of year as of 9 bits after the center of the start bit of the character T then the port will immediately respond with a single time data string in the current format selected The Serial P...

Page 49: ...ugh the possible digit choices Alternatively directly enter the numbers using the keypad The cursor will advance to the next digit automatically When the display shows the value that you desire for th...

Page 50: ...TIMING INPUT OPTION Refer to manual Section 1 41 for specifications on the Time Interval Event Timing Input Use this function to measure the relationship of either periodic or randomly occurring event...

Page 51: ...arrow keys to select the correct input frequency for the XL DC to measure Press FUNC ENTR to enter the selection The display will now show Meas Interval 000001 sec Use a combination of right and left...

Page 52: ...alue on power up will be that in use prior to power down Press FUNC ENTR then 5 0 The display will show Latitude N 38 23 53 9 Press the right or left arrow keys to position the cursor beneath the char...

Page 53: ...TRIBUTION CABLE DELAY ENTRY REQUEST Use Function 52 to request or enter a fixed delay to be used for compensating the timing outputs for distribution cable delays between the XL DC and the point of us...

Page 54: ...display will show Altitude mode or Altitude mode Meters Feet Press the up or down arrow keys to toggle between Meters and Feet When the display shows the desired units of measure press FUNC ENTR to e...

Page 55: ...y be changed When the longitude value is as desired press FUNC ENTR to display Ave Altitude XXXXXX Meters By pressing a combination of arrow keys and or direct digit entry this height above the WGS 84...

Page 56: ...NTR then 6 5 The display will show Sat 14 or Sat 14 Enabled Disabled or some other satellite number Press the up or down arrow key to toggle between Enable and Disable When the display shows the desir...

Page 57: ...h year DST transitions may be set to occur at any hour of the day any day of the week or any month of the year with the following restriction If either transition is less than 24 hours from the start...

Page 58: ...non rolling week number since January 6 1980 The firmware has the current year embedded in code and will properly handle dates through the year 2015 In addition as the clock advances to each new year...

Page 59: ...offset Function 01 In addition Local time requires that Daylight Saving Time be properly set Function 66 if applicable The 12 24 hour mode Function 02 will only affect GPS Standard and Local times Pre...

Page 60: ...is the change in oscillator frequency per day Press FUNC ENTR again and the display will show Osc Drift 3 990e 12 DAY indicating that the internal or external oscillator frequency is changing positiv...

Page 61: ...llows the operator to scroll through the fault conditions that can affect the alarm outputs and enable or disable each one s contribution to the alarm outputs The fault condition is sampled on enterin...

Page 62: ...ith the GPS receiver such as it is failing to communicate with the host processor Major Alarm en NV RAM nvram status nvram status can be OK or Error If any checksum errors were found on recalling any...

Page 63: ...ing and decoding satellite information Minor Alarm en Tuning tuning status tuning status can be OK or Fault If the oscillator is near the limits of the range that it can be steered by the DAC then tun...

Page 64: ...arm enable settings timeout delay and time error threshold requested by the operator are made the current settings and stored in nonvolatile memory Models XL DC 600 and XL DC 601 have a Red Green LED...

Page 65: ...og timer timeouts followed by resets would result producing a blinking Red LED At the same time the open collector alarm output transistor might either be off or might toggle between off and on follow...

Page 66: ...as necessary Output strings from the Serial Port are kept to fixed lengths whenever possible This means that numeric values will often contain many leading blanks Numeric values are right justified s...

Page 67: ...01 13 00 CR Response ERROR 01 VALUE OUT OF RANGE CR LF The Serial Port will respond with the message ERROR 02 SYNTAX if it receives a string in an incorrect format Refer to GENERAL SERIAL INPUT AND OU...

Page 68: ...Last Entry F15 Exclusive Use Enable Off Off F17 Slow Code Setup 2 4 6 sec Last Entry F18 Software Version Request F26 Programmable Pulse Output see function Last Entry F28 Time Interval Event Timing...

Page 69: ...character for a colon MM two digit minutes offset LT line terminator either a carriage return and line feed for output strings or a carriage return only for input strings Sample request F01 CR Respon...

Page 70: ...nth ASCII character slash dd one or two digit day yy two digit year HH one or two digit hours ASCII character for a colon MM two digit minutes SS two digit seconds LT line terminator either a carriage...

Page 71: ...reshold value range is 200 ns to 40000000000 ns To determine if the time quality characters are enabled and what the thresholds are send F05 CR to the Serial Port The port will respond with the ASCII...

Page 72: ...ponse F06 OFF CR LF To enable keypad lockout send the following string Sample entry F06 ON CR Response OK CR LF 3 207 SERIAL FUNCTION F07 EXTERNAL OSCILLATOR ENABLE OPTION Use Serial Function F07 to e...

Page 73: ...r character HEX 01 CR ASCII Carriage Return character HEX 0D LF ASCII Line Feed character HEX 0A DDD day of year HH hours MM minutes SS seconds mmm milliseconds colon separator Q time quality characte...

Page 74: ...ASCII Line Feed character HEX 0A DDD day of year HH hours MM minutes SS seconds mmm milliseconds colon separator Q time quality character refer to Function 08 for values Sample entry F09 CR Second en...

Page 75: ...11 SEP is one character only either a space comma or tab Any character other than an upper case X in a numeric position will not affect the output of that position The colon or decimal point however m...

Page 76: ...entry F11 DDD HH MM SS mmmQ CR Response OK CR F08 string output SOH DDD HH MM SSQ CR LF F09 string output SOH DDD HH MM SS mmmQ CR LF 3 212 reserved 3 213 SERIAL FUNCTION F13 WORST CASE TIME ERROR REQ...

Page 77: ...xternal oscillator frequency control input in scientific format sX XXEsXX DACNOMINAL decimal fraction of DAC full scale voltage for nominal DACsetting which corresponds to center frequency of the exte...

Page 78: ...F15 CR This asks for the state Response F15 SELF 3 216 reserved 3 217 SERIAL FUNCTION F17 SLOW CODE SETUP OPTION Use Serial Function F17 to request or set the pulse widths of the optional slow code o...

Page 79: ...8 SOFTWARE VERSION REQUEST Use Serial Function F18 to obtain information about the current version of the software installed in the unit Send the string F18 CR and the XL DC Serial Port will respond w...

Page 80: ...at the Start Time and the falling edge will occur at the Stop Time The times specified are compared with local time which is UTC adjusted by the local offset Leading zeros are required Sample entry F...

Page 81: ...t the output regardless of the time F26 XXX XX XX XX XXX 000 00 00 00 000 The default power on Pulse Out setting is F26 000 00 00 00 00 000 00 00 00 000 Since the day is day 000 the Start and Stop tim...

Page 82: ...if the events are continuous A burst of 100 events within 1 0 s may be recorded The resolution is 30 ns Send a CTRL C to exit this mode Sample entry F28 ET CR Response 111 22 33 44 123456700 CR LF 3 2...

Page 83: ...mode measurement request has been received the previous measurement timestamp is subtracted from the current one and the difference is divided by the number of zero crossings between these two timesta...

Page 84: ...easurements are continually output at the specified measurement interval until a CTRL C character Hex 03 is received Reception of the CTRL C character automatically sets the F29 mode to OFF In PERIODI...

Page 85: ...ed default for position is that of the TrueTime factory in Santa Rosa California The position on power up will be the same as it was prior to power down To determine the present position send F50 CR a...

Page 86: ...e entered or a syntax error will occur causing the entered string to be ignored 3 251 SERIAL FUNCTION F51 ANTENNA CABLE DELAY ENTRY REQUEST Use Serial Function F51 to enter or request the antenna cabl...

Page 87: ...eld in NVRAM Positive delays entered here will advance the XL DC timing outputs while negative delays will retard them To determine the present value send F52 CR to the Serial Port The port will respo...

Page 88: ...line feed for output strings or a carriage return only for input strings Sample request F53 CR Response F53 SURVEY STATIC 6 SATS CR LT To enter TIME mode send the following character string Sample en...

Page 89: ...e to transport of the receiver and antenna or error in the initial entry will be cleared and recalculated automatically once positioning begins at the new site and the error is detected To determine t...

Page 90: ...38d23 51 3 w 122d42 53 2 10m CR equivalent F56 38D23M51 3S 122D42M53 2S 10M CR Response OK CR LF Sample request F56 CR after sending above string Response F56 N 38d23 51 3 W 122d42 53 2 10m ENTERED C...

Page 91: ...0 00 cr lf F60 prn 11 good enabled sig level 0 00 cr lf F60 prn 2 good enabled sig level 0 00 cr lf F60 prn 23 good enabled sig level 0 00 cr lf F60 prn 21 good enabled tracked sig level 7 19 cr lf 3...

Page 92: ...shipped default is Off The default value on power up will be that in use prior to power down To request the present status of the daylight saving enable send F66 CR to the Serial Port The port will re...

Page 93: ...le Entry F66 MANUAL 0 CR Response OK CR LF Meaning DST will now be entered on the last week of the month All other parameters remain unchanged Sample Entry F66 MANUAL 4 2 2 3 13 4 6 11 CR Response OK...

Page 94: ...e Zone and Daylight Saving Time adjustments if enabled by the user Standard Time modifies UTC time to include the Time Zone adjustment if enabled by the user GPS Time is defined by and derived directl...

Page 95: ...is computed using an averaging time that is equal to the effective averaging time of the oscillator controller The oscillator drift rate is computed using a 24 hour average and is the daily drift rate...

Page 96: ...ASCII line feed character 3 273 SERIAL FUNCTION F73 REQUEST SET ALARM STATUS CONTROL This function allows the user to control which conditions will signal an alarm or fault through the 87 6XX GPS XL...

Page 97: ...iver Fault 4 Non Volatile RAM Data OK N Non Volatile RAM Data Fault 5 The minor alarm Time Error Threshold Reached has not persisted for Timeout seconds U The minor alarm Time Error Threshold Reached...

Page 98: ...leaves it unchanged Sending F73 SP MASK CR returns F73 SP MASK SP M12345678 SP m12345678 CR LF Sending F73 SP MASK SP M12345678 SP m12345678 CR sets the alarm mask where the mask characters are M M M...

Page 99: ...hich the time error fault is activated can be queried or set by the following command Sending F73 SP THRESHOLD CR returns F73 SP THRESHOLD SP nanoseconds SP ns CR LF where nanoseconds is the time erro...

Page 100: ...d Orange Minor enabled alarm fault time error outside threshold Blinking Red Orange Minor enabled alarm fault time error within threshold Solid Green No enabled alarm faults time error outside thresho...

Page 101: ...ime can be read by the following command F73 SP SUPPRESS CR which returns F73 SP POWER ON SP MINOR SP ALARM SP SUPPRESS SP seconds SP s CR LF where F Ascii character F 73 function number seconds secon...

Page 102: ...X XL LD DC CM MA AN N d do oc c 3 3 7 73 3 R RE EV V E E Send the string F79 CR and the Serial Port will respond by initiating a warm start Sample entry F79 CR Response OK CR LF...

Page 103: ...control functions This segment is generally available for data of the user s choice In the IRIG B code output of Model XL DC this segment may encode worst case time error flags as explained below Nei...

Page 104: ...r exceeds threshold 2 Element P5 80ms encodes a binary 1 when the error exceeds threshold 3 and P5 90ms when the error exceeds threshold 4 8 4 through 8 9 reserved 8 10 SPECIAL IRIG B TIME CODE FORMAT...

Page 105: ...40 80 100 200 5ms DAYS WEIGHTED CONTROL DIGITS 5ms TYPICAL CONTROL FUNCTIONS P6 P7 TIME QUALITY 4 TIME QUALITY 3 TIME QUALITY 2 TIME QUALITY 1 LOCK INDICATOR P8 P9 P0 10 20 30 40 50 60 70 80 90 0 0 P...

Page 106: ...TIME ON TIME TIME IN SECONDS BCD TIME OF YEAR MINUTES HOURS DAYS CONTROL FUNCTIONS 1 2 4 8 10 20 40 1 2 4 8 10 20 1 2 4 8 10 20 40 80 100 200 0 5 SEC BINARY 1 TYPICAL TYPICAL 1 SECOND INDEC MARKER DU...

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