Specifications
OWNER’S GUIDE INTERFACE CARDS | 18439
Channel setup
The DS-7 screenshot below shows the channel setup screen of the DEWE-CLOCK when it was selected as
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.
X absolute: Longitude component of position in degrees, minutes and fraction of minutes Y absolute:
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
Used sat.: Numbers of satellites used for calculation of position and speed Current sec: Seconds since
midnight (UTC + 15 seconds)
NMEA log: The raw NMEA string from the GPS receiver
The circle on the right side of the screen image (above) gives an overview of the satellites in view of the
GPS receiver and which of them are used from the receiver. The color 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 hori-
zon.
The eld <PPS sync> and <Not xed> change their color from grey to green depending if the appropriate
feature is available at the moment (green means available).
The PPS sync is used for hardware synchronization to analog 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.