CG-5 Gravity Meter Operation Manual - Scintrex

directly in mGals. The data is stored in Flash memory and can be sent to aprinter, modem, recorder or PC.The gravity sensor, control system and battery are integrated into a singleinstrument housing, which doubles as a carrying case. This eliminates theneed for packing and unpacking the sensor between readings. Stability isincreased and the risk of an accident is reduced by the absence of an externalcable between the battery and sensor. The mounting system which indexesthe Autograv onto the tripod further increases instrument stability.When setting the Autograv up for a reading, the software-based tilt sensorsprovide greater accuracy and are easier to operate than the conventionalbubble levels. The gravity meter displays the outputs from the sensors onhigh resolution meters on the ¼ VGA display.Excellent protection from changes in ambient temperature and atmosphericpressure is achieved by sealing the Autograv sensing element in atemperature stabilized vacuum chamber. The wide operating temperatureenables the operator to use the Autograv in many environments. Since thesensor is made from non-magnetic fused quartz, the Autograv is not affectedby magnetic field variations (as long as they are less than ten times theEarth's magnetic field, i.e. ± 0.5mT).Low drift is a result of the extremely stable operating environment of thequartz elastic system. It allows the long term drift of the sensor to beaccurately predicted and a real time software correction reduces it to less than0.02 mGals per day.The internal Smart rechargeable battery provides sufficient power to operatethe Autograv throughout a normal survey day. An operator can check thebattery voltage at any time by pressing any key and viewing the display.Hardware FeaturesThe hardware components of the CG-5 comprise a graphic display, keyboard,data dump connectors, Flash memory, real time clock and a Smart batterysupply.Graphic Display and KeyboardThe graphic display is a quarter VGA display that operates at -20°C to+45°C. When heated, the display operates from -35°C to +45°C. Data entryis via a sealed 27 key alphanumeric keyboard.xivCG-5 Manual - part # 867700 Revision 5