The GPS16X-HVS is a global positioning system (GPS) receiver that provides position, velocity, and timing information. Campbell Scientific configures the GPS16X-HVS and modifies its cable so that the receiver can more easily interface with our dataloggers.Read More
The GPS16X-HVS, manufactured by Garmin International, consists of a receiver and an integrated antenna. It receives signals from orbiting Global Positioning System (GPS) satellites, and then uses the signals to calculate position and velocity. The GPS16X-HVS also provides a highly accurate one-pulse-per-second (PPS) output for precise timing measurements.
The default settings are typically used. Changing the default settings or options requires additional hardware to connect to a PC running GPS16 software. (See the Ordering Info on the web page.) The software can be downloaded, at no charge, from the Garmin website (www.garmin.com).
By default, the instruction expects the GPS unit to be set up at 38400 baud, outputting the GPRMC and GPGGA sentences once per second. The datalogger expects the start of the second to coincide with the rising edge of the PPS signal. If there is no PPS signal or if the required sentences come out at less than once per second the datalogger will not update its clock. GPS units with lower baud rates can be used with the GPS instruction but the baud rate has to be set for the relevant Com port it is to be connected to either in the datalogger settings or by including a SetStatus command after the BeginProg instruction in the program (e.g., SetStatus("BaudrateCOM4",19200)). Baud rates below 2400 bps will not work as the GPS unit will not be transmit the two GPS sentences once per second reliably. Similar problems can be encountered even at higher baud rates if too many optional GPS strings are selected to be output.
|Receiver||WAAS enabled. 12 parallel channel GPS receiver continuously tracks and uses up to 12 satellites (up to 11 with PPS active) to compute and update the position.|
|Update Rate||Factory set to 1 s between updates. (Programmable from 1 to 900 s.)|
|PPS Output||1 Hz pulse; 1 µs accuracy (Width factory set to 100 ms.)|
|Baud Rate||Factory set to 38400 bps.|
|Operating Temperature Range||-30° to +80°C|
|Storage Temperature Range||-40° to +80°C|
|Operating Voltage Range||8 to 40 Vdc|
|Current Drain||65 mA active (@ 12 Vdc)|
|Velocity Accuracy||0.1 knot RMS steady state|
|Cable Length||4.57 m (15 ft)|
|Diameter||9.1 cm (3.58 in.)|
|Height||4.2 cm (1.65 in.)|
|Weight||332 g (12 oz)|
Position Accuracy (95% typical)
|GPS Standard Positioning Service (SPS)||< 15 m|
|DGPS (USCG/RTCM) Correction||3 to 5 m|
|DGPS (WAAS) Correction||< 3 m|
|Reacquisition||< 2 s|
|Hot||~1 s (all data known)|
|Warm||~38 s (initial position, time and almanac known, ephemeris unknown)|
Our CR6, CR800, CR850, CR1000, and CR3000 dataloggers typically use the CRBasic GPS() instruction to read the GPS16X-HVS.
For the GPS() instruction to set the time or use the pulse from the GPS sensor, some data loggers need an updated clock chip. Some data loggers will require an adapter to convert the 3V PPS output of the GPS16X-HVS to a 5 V signal.
The clock chip is factory replaced, which requires an RMA (Returned Material Authorization). Data loggers with the following serial numbers need an updated chip:
|Data Logger||Serial Number|
|CR800, CR850||< 7920|
|CR6||Works with all|
In August 2014, Garmin changed the GPS16X-HVS PPS output signal from 5 V to 3 V. Units with serial numbers greater than 1A4189318 have a 3 V PPS output signal. When this new design is used with a CR800, CR850, CR1000, or CR3000 datalogger, a 3 V to 5 V voltage shifter is required for use with the PPS signal output. The SW12V or A300 can be used for this purpose. This level shifter is NOT required for the CR6 datalogger.
*Contact Campbell Scientific about using the GPS16X-HVS with these data loggers.
**May require an adapter. If PPS input is required, use the A300 level shifter.
♣The CR5000 can be connected using an SDM-SIO1A.
The GPS16X-HVS mounts to a mast or crossarm using the CM235 Magnetic Mounting Stand. Typically, the GPS16X-HVS mounts to the CM235 magnetically with the addition of the 17212 Magnetic Mount. Alternatively, the GPS16X-HVS can be mounted directly to the CM235 using three M4 screws supplied with the 17212 or by the customer.
Number of FAQs related to GPS16X-HVS: 6
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The following are possible causes:
This can be done, but only one GPS() instruction can be included in a program because it is not desirable to have multiple inputs competing for clock synchronization. Use the SerialOpen() and SerialInRecord() instructions to pull in the data from the multiple sensors, and use the SplitStr() instruction to parse the data out.
No. The system needs to be stable before the information output is used to synchronize the clock. When PPS is not being used, clock operation proceeds as normal, such as when a GPS receiver is not connected.
To record the data, do the following:
The easiest method for receiving and parsing out latitude and longitude information is to use the GPS() instruction.
Refer to the CRBasic Editor Help for the GPS() instruction. The system is working correctly. The data logger clock has been synchronized and is detecting a PPS line low to high transition within a 10 ms window before the start of the second.
Campbell Scientific offers the GPS16X-HVS for the purpose of synchronizing with GPS time. Other GPS units may be used if they produce GPRMC and GPGGA sentences. Time synchronization accuracy may be improved if the unit has a PPS (pulse per second) output.