Brandywine Portable Timing Unit User manual

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

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MANUAL&P/N&900000118&REV&D&
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Revision(
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Comments(
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Initial&Release&
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4-23-10&
Front&Panel&Indications&change&
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11-16-12&
Added&Web&interface&section&
D&
10-31-18&
Updated&drawings&to&latest&revision&
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MANUAL&P/N&900000118&REV&D&
3!
Table(of(Contents(
1!Introduction+.......................................................................................................................+5!
2!Specifications+.....................................................................................................................+6!
3!Rear+Panel+Connections+..................................................................................................+8!
4!Getting+Started+...................................................................................................................+9!
4.1!Powering+up+the+PTU+.............................................................................................................+9!
4.2!Setting+the+Network+Address+..............................................................................................+9!
4.2.1!Discovering!the!IP!Address.!.........................................................................................................!9!
4.2.2!GPS!Operation!....................................................................................................................................!9!
4.2.3!HaveQuick!Input!............................................................................................................................!10!
4.2.4!IRIG!B!Input!.....................................................................................................................................!10!
4.2.5!1PPS!....................................................................................................................................................!10!
4.2.6!Output!Timing!Signals!.................................................................................................................!10!
4.2.7!Front!Panel!Indications!..............................................................................................................!10!
4.2.8!Battery!Charge/Discharge!operation!...................................................................................!11!
5!Web+Interface+..................................................................................................................+11!
5.1!Accessing+the+web-based+interface+................................................................................+11!
5.2!+Accessing+Functions+on+the+PTU+....................................................................................+12!
5.3!Viewing+the+Current+Status+of+the+PTU+system+..........................................................+13!
5.3.1!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!................................................................................................!26!
5.4.7!Changing!The!Display!Brightness!..........................................................................................!27!
5.4.8!Changing!The!Access!Password!..............................................................................................!28!
6!Troubleshooting+Guide+................................................................................................+29!
6.1!Unit+does+not+power+up.+....................................................................................................+29!
6.2!PTU+does+not+acquire+satellites+......................................................................................+29!
6.3!Time+Valid+does+not+illuminate,+but+the+PTU+is+tracking+satellites+....................+29!
6.4!Battery+does+not+hold+charge+..........................................................................................+29!
6.5!Red+Fault+light+is+on+............................................................................................................+29!
7!Support+Information+.....................................................................................................+30!
8!Front+Panel+......................................................................................................................+30!
9!Rear+Panel+........................................................................................................................+31!
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MANUAL&P/N&900000118&REV&D&
4!
Table(of(Figures(
Figure+1+-+Portable+Timing+Unit+..........................................................................................................................+9!
Figure+2+-+PTU+Management+Web+Page+.........................................................................................................+12!
Figure+3+-+PTU+Main+Menu+.................................................................................................................................+12!
Figure+4+-+PTU+Status+Page+................................................................................................................................+13!
Figure+5+-+Alarm+List+............................................................................................................................................+15!
Figure+6+-+Current+GPS+Status+...........................................................................................................................+16!
Figure+7+-+PTU+Phase+Status+Page+....................................................................................................................+17!
Figure+8+-+PTU+Battery+Status+...........................................................................................................................+18!
Figure+9+-+Available+Reference+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+Front+Panel+.............................................................................................................................+30!
Figure+22+-+PTU+Rear+Panel+...............................................................................................................................+31!
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Table(of(Tables(
Table+1+-+Specifications+.........................................................................................................................................+7!
Table+2+-+Rear+Panel+Connections+......................................................................................................................+8!

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MANUAL&P/N&900000118&REV&D&
5!
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1Introduction(
The!Portable!Timing!Unit!(PTU)!is!low!cost,!battery!operated,!transportable!timing!
system!that!is!designed!to!provide!precise!time!of!day!at!point!of!use.!The!PTU!may!
be!automatically!synchronized!by!means!of!either!GPS!signals,!or!an!serial!time!code!
such!as!IRIG!B!or!Have!Quick.!
Operation!of!the!unit!can!be!monitored!via!an!Ethernet!interface,!or!by!means!of!
front!panel!indicators!and!displays.!Outputs!are!1PPS,!Have!Quick,!IRIG!B!Time!Code!
and!Network!Time!Protocol!(NTP).!
The!unit!is!mounted!in!a!rugged,!weather!proof!case!that!may!be!easily!transported!
to!the!point!of!use.!When!AC!power!is!available,!the!PTU’s!built-in!power!supply!will!
automatically!charge!the!internal!batteries.!
Reference+Input+Sources!
The!PTU!is!extremely!flexible!in!its!ability!to!synchronize!to!a!variety!of!timing!
sources.!Available!references!are:!
•16!channel!GPS!SPS!receiver!(standard)!!
•12!channel!GB-GRAM!SAASM!GPS!receiver!(optional)!!
•IRIG!B!Time!Code!(standard)!!
•HaveQuick/1PPS!from!external!GPS!receiver!(standard)!
Once!synchronized!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!internal!time!of!the!PTU!is!maintained!by!a!high!precision!oscillator.!Selection!of!
the!oscillator!type!will!determine!the!accuracy!of!the!PTU!when!its!reference,!(such!
as!GPS)!is!not!available.!Available!internal!oscillator!options!are!!
•Temperature!Compensated!Crystal!Oscillator!(TCXO)!-option!!
•Oven!Controlled!Crystal!Oscillator!(OCXO)!standard!!
•Atomic!Rubidium!Oscillator!–!option!
Network+Interface+!
The!PTU!incorporates!an!Ethernet!connection!that!provides!a!convenient!means!of!
monitoring!status!of!the!instrument!via!a!computer!and!simple!web!browser.!This!
interface!is!also!used!to!provide!NTP!synchronization,!firmware!updates!and!
Browser!based!setup!features.!!
Output+Signals!
The!PTU!provides!a!variety!of!timing!signal!outputs,!giving!maximum!application!
flexibility!
•1PPS!1!Pulse!Per!Second!Signal!Time!Mark!!
•Have!Quick!Time!Code!!
•IRIG!B!Time!Code!
•NTP!

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MANUAL&P/N&900000118&REV&D&
6!
Internal+Battery+Backup!
The!PTU!contains!an!internal!7Ah!battery!that!will!operate!the!system!in!the!event!
prime!power!is!lost.!The!battery!charge!is!monitored!and!maintained!whenever!
prime!power!is!applied!to!the!PTU.!Status!is!indicated!by!front!panel!LED’s.!Battery!
life!is!dependent!upon!the!oscillator!configuration!selected!and!the!ambient!
temperature,!but!5!hours!is!typical!for!the!OCXO!version.!
Time+Display!
An!11!digit!display!indicates!Years,!Days,!Hours,!Minutes!and!Seconds.!Illumination!
of!the!display!is!controlled!by!a!front!panel!switch!to!conserve!battery!life.!
Weatherproof+Enclosure!
The!PTU!is!housed!in!a!sturdy!weatherproof!enclosure!that!is!suitable!for!outdoor!
use!in!all!weather!conditions.!!
2Specifications(
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!altitude!with!
respect!to!WGS84!after!24!hour!position!
averaging!
Timing!Accuracy!(tracking!satellites)!
±!50!ns.!Absolute!UTC!.!
Std!Deviation!15ns!(OCXO)!
Timing!Accuracy!(holdover!mode,!±!5ºC)!
<!20ms/day!(TCXO)!
<!50!µsec/day!(OCXO)!
<!5!µsec!/!day!(Rb)!
1PPS!Output!
!Connector!
!Level!
!
! On!Time!
!
BNC!
0-5V!or!0-10V!into!50Ω!link!selectable!
by!user!
Rising!Edge!
Network!Interface!
!Interface!Type!
!Protocols!
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10/100BaseT!
TCP/IP,!UDP,!NTPv3,!HTTP,!SNMP!v1,!
DHCP!
Serial!Interface!
!Type!
!Baud!Rate!
!Content!
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RS232!
9600,!N,8,1!
User!configurable,!broadcast!1/sec!

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MANUAL&P/N&900000118&REV&D&
7!
IRIG!Time!Code!Output!
!Connector!
!Code!Type!
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!Control!Functions!
!Level!
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BNC!
IRIG!B125,!A135,!E115,!G145,!standard!
via!menu!selection.!
IEEE!1344!–!IRIG!B125!only.!
3!V!p-p!into!600!ohm!
Have!Quick!Output!
!Connector!
!Code!Type!
!Levels!
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BNC!
Have!Quick!II!per!ICD-GPS-060A!
0-5V!
Alarm!Status!
Voltage!free!relay!changeover!contacts!
Status!Indicator!LED’s!
Power,!GPS!Locked,!Time!Valid,!IRIG,!
Have!Quick,!Fault,!Battery!Charge,!
Battery!Low!
1PPS!Input!
!Connector!
!Level!
! Impedance!
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BNC!
2.5V!to!5V!
50Ω!
Have!Quick!Input!
!Connector!
!Code!Type!
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BNC!
Have!Quick!II!per!ICD-GPS-060!
IRIG!Time!Code!Input!
!Connector!
!Code!Type!
!Control!Functions!
! Impedance!
!Level!
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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!
!
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! Humidity!
!Sealing!
!Power!
!
Instrument:!-40!to!+60!ºC!
Rb1!Option:!-10!to!+50!ºC!
RB2!Option:!-20!to!+60!ºC!
95%!
IP54,!NEMA!3!
85-265VAC!50/60Hz!
12VDC!
Dimensions!
6”!W,!8”!H,!12”!D!
Weight!
11!lb.!typical!
EMC!Emission!
EN55022!
FCC!Chapter!15!Part!B!
EMC!Immunity!
EN55024!
Table+1+-+Specifications+

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MANUAL&P/N&900000118&REV&D&
8!
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3Rear(Panel(Connections(
CONNECTOR REFERENCE
CONNECTOR TYPE
CONNECTOR
PIN
SIGNAL
J1
BNC
CENTER
10 MHz Outputs
GPS Receiver Input
SHIELD
GND
J2
BNC
CENTER
GPS Antenna
SHIELD
J3
Trigger / Alarm
DB-9 MALE
1
STATUS A IN
2
RX
3
TX
4
ALM OUT NC
5
GND
6
ALM OUT NO
7
STATUS 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
A
LINE
E
GND
D
NEUTRAL
J11 Power DC
C
12VDC
B
GND
F101
FUSE
Table+2+-+Rear+Panel+Connections+
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MANUAL&P/N&900000118&REV&D&
9!
4Getting(Started(
Figure+1+-+Portable+Timing+Unit+
4.1 Powering(up(the(PTU(
The!PTU!can!be!powered!from!110Vac!via!the!AC!power!cable,!or!from!external!
12Vdc!via!the!DC!power!cable.!!Both!cables!plug!into!J11,!a!5-pin!power!connector!
on!the!rear!of!the!unit.!!The!PTU!must!be!turned!on!for!battery!charging!to!
commence.!(See!Figure!22!-!PTU!Rear!Panel)!!
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A!front!panel!power!switch!is!used!to!turn!the!unit!on.!
4.2 Setting(the(Network(Address(
Connect!the!unit!to!an!Ethernet!switch!via!J10,!the!Ethernet!connector.!!The!PTU!
uses!a!10BaseT!Ethernet!interface!without!Auto-MDIX,!so!if!a!connection!is!to!be!
made!directly!to!a!laptop,!a!cross-over!Ethernet!cable!must!be!used.!
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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!simply!connecting!J1!to!J2!with!a!
short!coax!cable!(provided.)!!Alternatively,!an!external!antenna!can!be!used!by!
connecting!it!directly!to!J1,!the!GPS!receiver!input.!
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It!typically!takes!approximately!five!to!six!minutes!for!the!PTU!to!complete!its!
Rubidium!warm-up!cycle,!acquire!satellites!and!start!displaying!valid!time.!!Until!it!
does,!the!PTU!will!display!a!simple!count!value!starting!from!0.!!In!a!cold!start!

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MANUAL&P/N&900000118&REV&D&
10!
scenario,!where!the!unit!has!been!powered!down!for!longer!than!24!hours!or!has!
been!moved!more!than!60!miles!since!last!use,!it!may!take!as!long!as!15!minutes!to!
acquire!satellites!and!start!displaying!valid!time.!
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A!number!of!GPS!parameters!can!be!tracked!on!the!Status!page!of!the!web-browser!
interface.!!Select!the!Status!tab!at!the!top!of!the!browser.!!The!number!of!satellites!
tracked!as!well!as!the!position!data!from!the!GPS!can!be!viewed.!
!
As!soon!as!4!satellites!are!tracked,!the!front!panel!LED!labeled!“GPS!Locked”!will!
light!up.!
4.2.3 HaveQuick(Input(
The!HaveQuick!reference!requires!both!a!standard!HaveQuick!II!and!a!1PPS!input!
signal,!both!conforming!to!ICD-GPS-060A.!!Connect!the!HaveQuick!source!to!J5!and!
the!1PPS!source!to!J9.!!Ensure!that!HaveQuick!is!selected!as!reference!on!the!web-
browser!Setup!page.!
4.2.4 IRIG(B(Input(
Connect!a!standard!1kHz!modulated!IRIG-B!signal!to!the!BNC!connector!at!J7,!and!
ensure!that!IRIG-B!is!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!values.!!
4.2.6 Output(Timing(Signals(
Regardless!of!the!input!reference!selected,!the!PTU!will!always!provide!the!
following!output!signals:!
!
!HaveQuick!Out!(J4)!
! Time-code!Out!(J6).!IRIG!B125!is!the!default!settings.!
!1PPS!Out!(J8)!
4.2.7 Front(Panel(Indications(
The!front!panel!shows!a!date/time!display!in!years,!days,!hours,!minutes!and!
seconds.!!The!date!and!time!displayed!is!derived!from!the!currently!selected!
reference!input,!namely!GPS,!IRIG-B,!HaveQuick!or!1PPS.!!The!display!is!also!used!to!
display!the!IP!address!of!the!unit!on!power-up.!
!
The!front!panel!7-segment!time/!date!display!is!turned!off!by!default,!to!allow!the!
maximum!battery!life!during!the!discharge!cycle.!!To!view!the!7-segment!display,!
push!and!hold!the!“Display”!button!on!the!right-hand-side!of!the!front!panel.!

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MANUAL&P/N&900000118&REV&D&
11!
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LEDs!are!used!to!indicate!whether!the!device!is!set!to!HaveQuick!or!IRIG!as!input!
reference.!!If!neither!the!HaveQuick!or!IRIG!In!LEDs!are!lit,!the!unit!is!set!for!GPS!
operation.!
!
A!fault!LED!will!illuminate!if!any!internal!fault!is!detected.!!These!faults!include!
output!signal!levels,!internal!communication!errors!and!oscillator!problems.!
!
If!the!unit!is!in!GPS!reference!mode!and!is!tracking!at!least!4!satellites,!the!GPS!
locked!LED!will!light!up.!!!
!
The!Time!Valid!LED!will!illuminate!when!the!selected!reference!is!being!decoded!
without!error.!!In!addition,!for!GPS!reference,!the!Time!Valid!LED!will!stay!on!for!8!
hours!after!the!unit!has!stopped!tracking!satellites.!
4.2.8 Battery(Charge/Discharge(operation(
The!Charge!LED!turns!solid!yellow!when!external!power!is!present!and!the!battery!
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!speaker!in!the!unit!will!start!
beeping!to!alert!the!user!to!the!low!battery.!!When!the!battery!charge!level!reaches!a!
very!critically!low!point,!it!will!emit!a!continuous!tone!until!it!automatically!powers!
down.!
!
To!charge!the!battery,!reconnect!external!AC!or!DC!power,!and!turn!the!front!panel!
power!switch!on.!
5Web(Interface(
5.1 Accessing(the(web-based(interface(
When!the!unit!is!powered!up,!the!display!will!show!its!IP!address!as!part!of!the!
startup!sequence.!!Enter!this!IP!Address!into!the!address!bar!of!your!web!browser.!!!
This!will!bring!up!the!PTU’s!main!information!page.!!(See!Figure!2!-!PTU!
Management!Web!Page)!
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MANUAL&P/N&900000118&REV&D&
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+

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MANUAL&P/N&900000118&REV&D&
13!
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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!
!

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!Possible+Modes:+
Holdover:!The!system!is!using!the!internal!oscillator!as!a!reference,!
and!is!counting!from!the!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.!

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5.3.1 Viewing(the(current(list(of(alarms(
Select!“Alarm-List”!from!the!status!menu,!this!will!display!a!list!of!the!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.”!

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5.3.2 View(the(current(GPS(status(
If!the!unit!is!connected!to!a!GPS!antenna,!and!is!using!a!GPS!reference!as!an!input!
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+

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5.3.2.1 Navigating-the-interactive-GPS-status-page-
To!navigate!the!interactive!map!of!the!GPS!constellation,!click!and!drag!the!map!to!
reposition!the!map!hemisphere,!using!the!left!and!right!motion!of!your!pointer!to!
adjust!the!orientation!of!the!map,!and!the!up!and!down!motion!of!your!pointer!to!
adjust!the!angle!of!the!map.!
5.3.3 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!remove!the!pulse-to-pulse!jitter!typically!found!in!a!GPS!
receiver,!the!tuning!value!shows!the!control!input!to!the!PTU!Oscillator.!
Figure+7+-+PTU+Phase+Status+Page+

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5.3.4 Viewing(the(Battery(Status(
Under!the!status!heading!of!the!main!menu,!select!“Battery”!to!view!a!graph!
showing!the!current!Battery!voltage,!and!a!graph!showing!the!charging!and!
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+Battery+Status+

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5.4 Changing(the(Settings(on(the(PTU(
5.4.1 Selecting(a(Reference(
From!the!menu,!select!“Reference”!from!the!settings!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+

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5.4.2 Setting(the(GPS(Mode(
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+