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Brandywine Portable Timing Unit User Manual Download Page 13

 
 

 

MANUAL P/N 900000118 REV D 

13 

 

5.3

 

Viewing the Current Status of the PTU system 

From the “MENU” button, select “General” from the status menu.  This shows 
information such as the current output time, UTC time, up time, the current input 
reference, the current output format, current system state, alarm status, battery 

status, and current internal temperature. 

Figure 4 - PTU Status Page 

Output Time

: The current time of day being displayed or being output by the PTU 

UTC Time

: The current time of day from the GPS constellation in Universal Time 

Coordinate (UTC) 

Up Time

:  The amount of time that the PTU has been powered on 

Hour Meter

:  This is the number of hours since the PTU was first built. 

Reference

: The current reference input being used by the PTU 

Output TimeCode

: The current timecode format in use by the PTU’s outputs 

TFOM

: Time Figure Of Merit – the difference between the unit’s time and the 

reference input.  A 1 means the unit is accurate to within 1ns, a 2 means the unit is 
accurate to within 10ns, a 3 means 100ns, etc 

System state

: The current mode of the PTU’s internal clock 

 

Summary of Contents for Portable Timing Unit

Page 1: ...N 900000118 REV D 1 User Guide Portable Timing Unit Model PTU P N 001 5XXX Revision D November 2018 Brandywine Communications 1153 Warner Ave Tustin CA 92780 714 755 1050 714 755 0175 http www brandywinecomm com ...

Page 2: ...MANUAL P N 900000118 REV D 2 Revision Date Comments A Initial Release B 4 23 10 Front Panel Indications change C 11 16 12 Added Web interface section D 10 31 18 Updated drawings to latest revision ...

Page 3: ... Viewing the current list of alarms 15 5 3 2 View the current GPS status 16 5 3 3 Viewing the Current Phase Lock Status 17 5 3 4 Viewing the Battery Status 18 5 4 Changing the Settings on the PTU 19 5 4 1 Selecting a Reference 19 5 4 2 Setting the GPS Mode 20 5 4 3 Adjusting the Output Settings 22 5 4 4 Changing the IP Address 24 5 4 5 Changing SNMP Settings 25 5 4 6 Changing The Location Setting ...

Page 4: ...Sources 19 Figure 10 PTU Reference Settings 19 Figure 11 Available GPS Modes 20 Figure 12 GPS Settings Menu 20 Figure 13 PTU Output Options 22 Figure 14 PTU Output Settings 22 Figure 15 1PPS Signal showing normal and inverted 23 Figure 16 PTU IP Address Settings 24 Figure 17 SNMP Settings 25 Figure 18 Location Setting 26 Figure 19 Brightness Controls 27 Figure 20 Password Settings 28 Figure 21 PTU...

Page 5: ...zed to the selected reference the PTU will use the reference to continuously calibrate its internal oscillator so that accurate time can be maintained in the absence the reference Front panel LEDs indicate the reference type in use and whether time is valid The PTU can be configured to always use a particular reference source or automatically select whatever source is available Time Keeping The in...

Page 6: ...door use in all weather conditions 2 Specifications Satellite Signal GPS L1 1575 42 MHz Satellite Code C A 1 023 MHz Receiver Type Parallel 16 Channel All in view satellites tracked continuously and simultaneously Warm Start 10 sec Open Sky Autonomous Start 60 Seconds Cold Start Open Sky Cold Start Requirement Automatic No input of time of position required Position Accuracy 2 4 m horizontal 5 m a...

Page 7: ...t Connector Level Impedance BNC 2 5V to 5V 50Ω Have Quick Input Connector Code Type BNC Have Quick II per ICD GPS 060 IRIG Time Code Input Connector Code Type Control Functions Impedance Level BNC B120 B122 B123 B125 IEEE 1344 supported 600 ohm 1 6Vp p Battery Life at 25 15ºC 24 Hours TCXO 5 Hours OCXO 3 Hours Rb Battery Charging Temperature 20ºC to 50ºC Environmental Temperature Humidity Sealing ...

Page 8: ...TUS B IN 8 GND 9 ALM OUT COMMON J4 BNC CENTER Have Quick Output Have Quick Out SHIELD GND J5 BNC CENTER Have Quick Input Have Quick IN SHIELD GND J6 BNC CENTER IRIG A B G Out IRIG A B G Out SHIELD GND J7 BNC CENTER IRIG B Input IRIG B IN SHIELD GND J8 BNC CENTER 1PPS Outputs 1PPS Out SHIELD GND J9 BNC CENTER 1PPS Inputs 1PPS IN SHIELD GND ETHERNET J10 RJ 45 1 TX 2 TX 3 RX 4 5 6 RX 7 8 J11 Power AC...

Page 9: ... is to be made directly to a laptop a cross over Ethernet cable must be used 4 2 1 Discovering the IP Address Power the PTU off and then power it back on Press and hold the display switch The Unit IP address will be shown after approximately 30 seconds 4 2 2 GPS Operation When GPS is selected as reference ensure that a GPS antenna is connected to the unit The chassis mounted antenna can be used by...

Page 10: ...s selected as reference input on the Setup page of the web browser 4 2 5 1PPS Connect a standard ICD GPS 060 1PPS 1 pulse per second signal to the J9 connector on the rear of the unit and ensure that Ext 1PPS is selected as reference input on the Setup page of the web browser Enter the date and time manually in the dialog boxes on the same web page and click submit to allow the PTU to read those v...

Page 11: ...ery is charging When external power is removed and the battery starts discharging the Charge LED will start flashing slowly The Battery Low red LED will flash when the battery voltage level drops below 11V When the level drops below 10 5V the LED will turn solid red The unit will turn off automatically when the battery voltage drops below 10V If the battery level reaches a critically low point a s...

Page 12: ...12 5 2 Accessing Functions on the PTU To access different functions of the PTU management web page select the button labeled MENU in the top left hand corner of the web page Figure 2 PTU Management Web Page Figure 3 PTU Main Menu ...

Page 13: ... output by the PTU UTC Time The current time of day from the GPS constellation in Universal Time Coordinate UTC Up Time The amount of time that the PTU has been powered on Hour Meter This is the number of hours since the PTU was first built Reference The current reference input being used by the PTU Output TimeCode The current timecode format in use by the PTU s outputs TFOM Time Figure Of Merit t...

Page 14: ... last time it synchronized to an external reference Time Valid The system is locked to an external reference source such as GPS or IRIG and is displaying or outputting that time System Alarms If the system is currently displaying any alarms Battery Status The Current status of the battery Temperature The internal temperature of the unit ...

Page 15: ...he current system alarms Figure 5 Alarm List The possible alarms that the PTU can have are as follows No internal 1PPS generated from the FPGA Serial FLASH failed Serial EEPROM memory failed FPGA failed to initialize or load Oscillator rubidium is showing unlocked Battery under voltage fault Battery over voltage fault Reference has a fault ...

Page 16: ...source select GPS from the status section of the main menu This will display a webpage showing the current GPS status including Latitude Longitude Altitude Heading and Speed This page also displays an interactive 3D map of the current GPS constellation visible to the connected GPS antenna See Figure 6 Current GPS Status Figure 6 Current GPS Status ...

Page 17: ... 3 3 Viewing the Current Phase Lock Status From the MENU button select Phase Lock from the status section this will display an interactive graph showing the current Tuning Value and both Raw Phase and Filtered Phase The Raw Phase shows the difference between the reference and the PTU timing The filtered phase shows the value of the phase after passing through a software filtering algorithm to remo...

Page 18: ...d discharging amperage 5 3 4 1 How the battery charges The PTU has a battery life of approximately eight hours at 25ºC and takes about 12 hours to charge The charger is a constant current charger until the battery voltage reaches 14 3V at which point it changes to a constant voltage Once the battery drops below 100ma the charge voltage switches to a trickle charge mode at 13 8V Figure 8 PTU Batter...

Page 19: ...tings submenu From the Select Reference dropdown menu select your input source For 1PPS based reference sources the time and date will have to be entered manually See Figure 9 Available Reference Sources for a list of the available reference sources that the PTU can use Figure 9 Available Reference Sources Figure 10 PTU Reference Settings ...

Page 20: ...de From the menu select GPS from the settings submenu From here you can select your GPS Mode see Figure 11 Available GPS Modes set your GPS position manually or force a cold start of the GPS system Figure 11 Available GPS Modes Figure 12 GPS Settings Menu ...

Page 21: ...survey it s location by collecting and averaging the position that it computes from the GPS satellites The averaged position is then stored into the GPS receiver and the receiver transitions to a timing mode where the averaged position is assumed correct and time is only calculated from all satellites in view Erroneous satellite tracking data can be detected and removed from the over determined ti...

Page 22: ... Output Settings From the main menu select Output from the settings submenu This lets you change the Output timecode format 1PPS settings and change the time zone and daylight savings settings Figure 13 PTU Output Options Figure 14 PTU Output Settings ...

Page 23: ...DVANCE the 1PPS relative to the reference A positive delay will RETARD the 1PPS relative to the reference Each individual 1PPS output can be delayed over a full second range 0 5 seconds in 1ns steps independent of the settings of the other outputs The Pulse width may be varied over the range of 10ns to 650µs in increments of 5ns Enter the desired pulse width in nanoseconds in the box labeled Outpu...

Page 24: ...Address From the main menu select IP from the settings submenu From here you can change the IP Address Subnet Mask and Gateway address of the unit From here you can also enable DHCP however this action is not recommended Figure 16 PTU IP Address Settings ...

Page 25: ...Read Community Write Community and Trap IP Address 5 4 5 1 Monitoring the PTU using SNMP To monitor the PTU via Simple Network Management Protocol SNMP you will need to download an MIB file from the Support Downloads section of the Brandywine Communications website http www brandywinecomm com product support downloads Figure 17 SNMP Settings ...

Page 26: ... D 26 5 4 6 Changing The Location Setting From the main menu select Location from the settings submenu This setting tells the user where the unit is physically located within a facility e g Room 102 Figure 18 Location Setting ...

Page 27: ...Display Brightness From the main menu select Display from the settings submenu This dropdown setting allows you to change the brightness of the front panel display with 0 being the least bright and 15 being the brightest Figure 19 Brightness Controls ...

Page 28: ...ubmenu From here you can change the access password for the unit to prevent other users from changing settings You must have the current Username and Password in order to reset the existing username and password The factory default login credentials are Username BRANDYWINE Password BRANDYWINE Figure 20 Password Settings ...

Page 29: ...d 6 3 Time Valid does not illuminate but the PTU is tracking satellites Check that the PTU has finished its warmup cycle During power up the PTU needs at least five satellites to establish a GPS lock and only 1 satellite to be visible at all times after that first lock If the PTU is not in its warmup cycle check the GPS status page to see how many satellites it s tracking Using the PTU in mobile m...

Page 30: ...ill exhibiting problems not covered by the above troubleshooting guide please contact us for technical support at support brandywinecomm com or call us at 714 755 1050 If it becomes necessary to return your unit to the factory for repairs please call us at 714 755 1050 extension 113 to arrange an RMA 8 Front Panel Figure 21 PTU Front Panel ...

Page 31: ...MANUAL P N 900000118 REV D 31 9 Rear Panel Figure 22 PTU Rear Panel ...

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