Dewesoft Ds-gps-clock Product manual

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DS-GPS-CLOCK

TECHNICAL REFERENCE MANUAL

DS-GPS-CLOCK V20-2

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1

DS-GPS-CLOCK
TECHNICAL REFERENCE MANUAL
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
Table of contents

Table of contents 2
About this document 4
1. Legend 4
Specifications 5
1. Shock & Vibration 6
Device overview 7
1. GPS based operation 8
2. IRIG based operation 8
3. LED Description 8
3.1. Power 8
3.2. Status 9
4. Mounting the aerial 9
5. Warm-Up time 9
6. Scope of supply 10
7. Connection 11
7.1. Front Connectors 11
7.1.1. LEDs 11
7.1.2 Aerial connector 11
7.1.3 IRIG connector 12
7.2. Rear Connectors 12
7.2.1. Multi I/O Connector 13
7.2.2. Mini USB connector 14
7.2.3. SYNC connector 14
8. Installation 15
9. Connecting the DS-GPS-CLOCK to the DAQ-System 15
9.1. Synchronization to system with Clock and Trigger 15
10. Configuration of DewesoftX® for the DS-GPS-CLOCK 15
10.1. Update rate 16
10.2. Maps directories 16
10.3. Timing settings 16
10.3.1. Input settings 18
11. Channel setup 19
12. Measurement setup 20
13. Time code restore 20
Warranty information 23
1. Calibration 23
2. Support 23
3. Service/repair 23
4. Restricted Rights 24
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DS-GPS-CLOCK
TECHNICAL REFERENCE MANUAL
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5.5. Printing History 24
5.6. Copyright 24
5.7. Trademarks 24
6. Safety instructions 24
6.1. Safety symbols in the manual 24
6.2. General Safety Instructions 24
6.2.1. Environmental Considerations 25
6.2.2. Product End-of-Life Handling 25
6.2.3. System and Components Recycling 25
6.2.4. General safety and hazard warnings for all Dewesoft systems 25
7. Version History 28
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DS-GPS-CLOCK V20-2 3/28 

DS-GPS-CLOCK

TECHNICAL REFERENCE MANUAL

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2. About this document



2.1. Legend



The following symbols and formats will be used throughout the document.



Important

It gives you important information about the subject.

Please read carefully!



Hint

It gives you a hint or provides additional information about a subject.



Example

Gives you an example of a specific subject.

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DS-GPS-CLOCK V20-2 4/28 

DS-GPS-CLOCK

TECHNICAL REFERENCE MANUAL

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3. Specifications

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DS-GPS-CLOCK V20-2 5/28 

IRIG Input Specifications

Supported codes

IRIG code A or B / AM or DC

Compatibility (AM code)

0.5 Vpp to 10 Vpp

Ratio (AM)

3:1 ±10 %

Compatibility (DC code)

DC Level Shift TTL / CMOS compatible

Impedance

20 kΩ

Isolation

150 VDC

Trigger accuracy

1 µsec

IRIG output specifications

Supported codes

IRIG code B, DC

Isolation

None

Accuracy

< 1 µsec (delay to GPS PPS)

GPS specifications

General

12 channel, L1 frequency receiver

PPS accuracy

100 ns

Refresh rate

1 Hz

Position accuracy

Horizontal CEP



Autonomous

3.0 m



Differential

1.0 m

Trigger accuracy

1 µsec

System specifications

Clock accuracy locked

without drift

Clock accuracy unlocked

< 10 ppm

Input

SMA for GPS antenna, BNC for IRIG I/O

DS-GPS-CLOCK

TECHNICAL REFERENCE MANUAL

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3.1. Shock & Vibration

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DS-GPS-CLOCK V20-2 6/28 

Output: Trigger:





Clock and Trigger for DAQ-systems on DB9 connector

PPS (pulse per second), rising edge on time, 75 msec high

time, TTL level compatible 10 Hz to 10 MHz, rising edge

synchronized, 50 % duty cycle, TTL level compatible.

Power supply

USB powered, max. current 500 mA

Environmental specifications

Operation temperature

-5 °C to +70 °C

Storage temperature

-20 °C to +85 °C

Humidity

10 % to 80 %; non condensing

Dimensions (W x D x H)

133 x 104 x 43 mm (5.23 x 4.1 x 1.7 in.)

Weight

approx. 330 g (0.72 lb)

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Vibration Tests

Shock Test

European Standard

EN 600068-2-6

EN 60721-3-2 Class 2M2

EN 60068-2-27

Shape

Sine

Random

Half-sine

Frequency

0 Hz to 150 Hz

10 - 200 Hz

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Power spectral density

1 m/s² / Hz from 10 – 200 Hz

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Acceleration amplitude



15 g

Duration

30 Minutes per axis

11 ms

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Test in 3 axis, 3 shocks in each axis and direction

DS-GPS-CLOCK

TECHNICAL REFERENCE MANUAL

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4. Device overview

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The DS-GPS-CLOCK is a synchronized time base generator capable of using either GPS or IRIG as a time                 

source. This allows completely synchronized data acquisition of multiple systems whether they are            

mobile or stationary. Additionally, the DS-GPS-CLOCK can also be used as an IRIG time code generator               

(output IRIG B/DC) synchronized to the GPS time.

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The diagram below outlines the basic functionality of the DS-GPS-CLOCK:

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Image 1: Block Diagram

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DS-GPS-CLOCK

TECHNICAL REFERENCE MANUAL

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4.1. GPS based operation

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The base of any GPS receiver is precise time measurement. In addition to the position information a                

precise PPS (pulse per second) is generated by the GPS engine. This pulse is used to synchronize a 40                  

MHz oscillator with software PLL (phase locked loop). The result is an ultra-stable 40 MHz clock source                

which is completely free of drift over time.

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Out of this 40 MHz base clock, the programmable clock divider generates the clock frequency for the                

standard data acquisition system which is being output on the 9-pin DSUB connector or 4-pin Lemo               

connector.

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4.2. IRIG based operation

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The IRIG signal contains the binary-coded time (year, day of year, hours, minutes, seconds, fractions of a                

second) modulated on a sine wave carrier. This signal is decoded to the PPS and the drift-free 40 MHz                  

clock.

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The following IRIG time codes are supported:



●IRIG-A (10 Hz)

●IRIG-B (1 Hz)

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4.3. LED Description

4.3.1. Power

The power LED is solid green when the DS-GPS-CLOCK is in normal operation.

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Image 2: LED lights

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TECHNICAL REFERENCE MANUAL

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4.3.2. Status

The status LED indicates the current status of the device:

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4.4. Mounting the aerial

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The aerial supplied with the DS-GPS-CLOCK is designed to be mounted magnetically on any metallic              

surface. The cable length is 5 m.

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Please contact your sales manager if your application requires a different aerial.

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4.5. Warm-Up time

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When the DS-GPS-CLOCK is used as a GPS based time code generator for the first time, has been                 

moved more than 200 km, or not used for 10 hours (since last usage), it is recommended to perform a                   

‘cold start’. To get the best performance from your GPS in the future, perform this cold start in an open                   

place with a good all round view to the sky. Allow the GPS to map the satellites for at least 20 to 30                      

minutes. The GPS builds up the ‘Ephemeris’ data on each satellite which is stored in a non-volatile                

memory so that future satellite tracking is swift and stable. Once the GPS has carried out a successful                 

cold start, future satellite lock from power up will take between 15 seconds and 1 minute. Before going to                  

test in a shady environment with tall objects or near to trees, allow the GPS to settle in an open space for                     

5 to 10 minutes.



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DS-GPS-CLOCK V20-2 9/28 

At normal operation - when DS-GPS-CLOCK is

locked to the selected time source - it shortly

blinks once a second.



Image 3: LED: Normal Operation

When the time source signal is missing (neither

GPS or IRIG time code signal), the device

automatically goes to flying-wheel operation. This

is indicated by inverted blinking.



Image 4: LED: Missing Signal

DS-GPS-CLOCK

TECHNICAL REFERENCE MANUAL

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4.6. Scope of supply



When ordering the DS-GPS-CLOCK the following supply is also included in the package:



●0.5m 4-pin sync cable, for the synchronization of the system (LEMO SYNC-CBL

FGG00050.0500N2 2xFGG.00.304.CLAD35ZN 0,5m)

●USB-mini cable for connecting the device to the SBOX or PC (CABLE-USBAmini-USBBS-1.8m)

●CABLE-GLONASS-RG174-ANTENNA-5m (GLONASS,5M RG174 2J7501MP ANTENA)

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4.7. Connection

4.7.1. Front Connectors

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Image 5: Front connectors

4.7.1.1. LEDs

See chapter LED Description

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DS-GPS-CLOCK V20-2 10/28 

DS-GPS-CLOCK

TECHNICAL REFERENCE MANUAL

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4.7.1.2 Aerial connector

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4.7.1.3 IRIG connector

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DS-GPS-CLOCK V20-2 11/28 

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Image 6: SMA connector

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Pin

Description

1

Hot

2

shield



Image 7 : BNC connector



Pin

Description

1

out

2

GND

DS-GPS-CLOCK

TECHNICAL REFERENCE MANUAL

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4.7.2. Rear Connectors

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Image 8: Rear Connectors

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DS-GPS-CLOCK V20-2 12/28 

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TECHNICAL REFERENCE MANUAL

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4.7.2.1. Multi I/O Connector

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Multi I/O Cable

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Image 10: MULTI I/O cable

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DS-GPS-CLOCK V20-2 13/28 

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Image 9: DSUB-9 male connector

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Pin

Name

Description

1

n.c.

Not Connected

2

n.c.

Not Connected

3

CLK OUT

Scan clock output

4

n.c.

Not Connected

5

n.c.

Not Connected

6

PPS

Pulse Per Second

7

n.c.

Not Connected

8

DGND

Ground

9

n.c.

Not Connected

DS-GPS-CLOCK

TECHNICAL REFERENCE MANUAL

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4.7.2.2. SYNC connector



Interface connector: EEG.00.304.CLL

Mating connector: FGG.00.304.CLAD27Z

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DS-GPS-CLOCK V20-2 14/28 

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Image 11: Sync connector: pin-out (4-pin LEMO female)

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Pin

Name

Description

1

CLK

Clock

2

Trigg

Trigger

3

GPS-PPS

GPS - PPS

4

DGND

Digital Ground

DS-GPS-CLOCK

TECHNICAL REFERENCE MANUAL

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4.8. Installation



The hardware drivers for the DS-GPS-CLOCK are automatically installed together with DewesoftX®.           

There is no additional SW needed. You can start the software in the Windows start menu or use the icon                   

created on your desktop. For more information about the DewesoftX® installation please refer to the              

DewesoftX® Software User's Manual.

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4.9. Connecting the DS-GPS-CLOCK to the DAQ-System

4.9.1. Synchronization to system with Clock and Trigger

To synchronize standard data acquisition systems a start trigger and the possibility of external clocking              

is required. This input needs to be connected to the output of the DS-GPS-CLOCK sync signals of the                 

9-pin DSUB female (signal Scan Clock Output and PPS).



4.10. Configuration of DewesoftX® for the DS-GPS-CLOCK



When the DS-GPS-CLOCK is connected it will be automatically recognized in DewesoftX® Device            

settings menu:

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

Image 12: DewesoftX® device settings

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DS-GPS-CLOCK V20-2 15/28 

DS-GPS-CLOCK

TECHNICAL REFERENCE MANUAL

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4.10.1. Update rate



The update rate is fixed at 1 Hz.

4.10.2. Maps directories



Select the directories, where you stored your maps. You can copy your maps into this directory, add                

individual directories or remove unused directories from the box. Convert the maps to .jpg or .bmp               

format before selecting them.

4.10.3. Timing settings



When you want to use the DS-GPS-CLOCK as a high precision timing device for synchronized data               

acquisition, you need set the Time source as External.



a.) IRIG input



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Image 13: IRIG as external source

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DS-GPS-CLOCK V20-2 16/28 

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b.) GPS input

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Image 14: GPS as external source

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DS-GPS-CLOCK V20-2 17/28 

DS-GPS-CLOCK

TECHNICAL REFERENCE MANUAL

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4.10.3.1. Input settings



Time source

Here you can select which input signal (GPS or IRIG) is used for the time source.



Code type

If IRIG mode is selected as a time source, this drop-down menu defines the used code type (IRIG-A,                 

IRIG-B or IRIG-G).



Modulation

This selects the modulation type (AC or DC) of the IRIG input signal.



Output settings

The check-box “IRIG Out” enables the output of the internally generated IRIG signal on the BNC               

connector of the DSCLOCK.



Please note that only IRIG-B with DC modulation is supported as output signal.



Set do default Button



This button defines the current input- and output settings as power on default settings. This way the                

DS-GPS-CLOCK will always start up with the predefined settings.



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DS-GPS-CLOCK V20-2 18/28 

DS-GPS-CLOCK

TECHNICAL REFERENCE MANUAL

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4.11. Channel setup



The screenshot below shows the channel setup screen of the DS-GPS-CLOCK when it was selected as a                

GPS device. In the column ON/OFF you can select the channels for storing during the measurement.               

The default channel names are displayed in the column NAME. You can change them with a double                

click on it. Beside the channel names the actual value is displayed.





Image 15: Channel Setup



●Longitude component of position in degrees, minutes and fraction of minutes

●Latitude component of position in degrees, minutes and fraction of minutes

●Z: Altitude in meters above sea level

●Velocity: Speed over ground (vector of all 3 dimensions)

●Direction: True track over ground

●Distance: Integration of speed for getting the displacement (Only speed levels above 0.5 km/h             

are used to calculate the distance)

●Used sat.: Numbers of satellites used for calculation of position and speed

●Current sec: Seconds since midnight (UTC)

●GPS fix quality: To recognize in which mode the receiver is (Standalone, DGPS, RTK)

●NMEA: The raw NMEA string from the GPS receiver



The circle on the right gives an overview of the satellites in view of the GPS receiver and which of them                    

are used from the receiver. The colour of the shown satellites indicates the signal strength of them.                

From grey to dark green which is the strongest signal. Satellites shown in the centre of the circle are                  

directly above the GPS-aerial. Satellites shown at the border of the circle are near the horizon.



The field <PPS sync> and <Not fixed> change their colour from grey to green depending if the                

appropriate feature is available at the moment (green means available).



DS-GPS-CLOCK V20-2 19/28 

DS-GPS-CLOCK

TECHNICAL REFERENCE MANUAL



The PPS sync is used for hardware synchronisation to analogue channels. This will eliminate the time               

shift caused due the calculation time of the GPS receiver and of the data transfer time of the USB                  

interface.



The button “NMEA log” shows/hides the raw NMEA data stream from the GPS receiver.



4.12. Measurement setup



When the DS-GPS-CLOCK is used as a timing device and you switch to the measurement screen you                

will see the actual time from the DS-GPS-CLOCK shown in the top right corner of the screen. A green                  

clock next to this time indicates that the DS-GPS-CLOCK is locked to the GPS or IRIG time whereas a red                   

clock with additional Sync Lost warning indicates that the DS-GPS-CLOCK does not have any real input.





Image 16: sync OK





Image 17: sync lost



By default the local time is stored inside the data file, but if the measurement results from multiple                 

systems located in different time zones should be analysed it is recommended to set to UTC or GPS time                  

(Local time in settings). This can be done in the Global settings of DewesoftX® (Settings Global settings                

Displays). Doing so, the data from all data acquisition systems are containing the same absolute time               

stamp.





Image 18: Global Time Settings



DS-GPS-CLOCK V20-2 20/28 

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