Campbell CR850 - Page 431

Section 11. Glossary
431
EarthGround
Agroundingrodorothersuitabledevicethatelectricallytiesasystem
ordevicetotheearth.Earthgroundisasinkforelectricaltransientsand
possiblydamagingpotentials,suchasthoseproducedbyanearby
lightningstrike.Earthgroundisthepreferredreferencepotentialfor
analogvoltagemeasurements.Noteth
atmostobjectshavea"an
electricalpotential"andthepotentialatdifferentplacesontheearth‐
evenafewmetersaway‐maybedifferent.
engineeringunits
Unitsthatexplicitlydescribephenomena,asopposedtotheCR800
measurementunitsofmilliVoltsorcounts.
ESD
Electrostaticdischarge
ESS
EnvironmentalSensorStation
excitation
Applicationofaprecisevoltage,usuallytoaresistivebridgecircuit.
executiontime
Timerequiredtoexecuteaninstructionorgroupofinstructions.Ifthe
executiontimeofaprogramexceedstheScan() Interval,theprogramis
executedlessfrequentlythanprogrammed.
expression
Aseriesofwords,operators,ornumbersthatproduceavalueorresult.
Glossary.FileControl
File Control is a feature of LoggerNet, PC400 and RTDAQ
(p. 76)
datalogger support software. It provides a view of the CR800 file
system and a menu of file management commands:
Delete facilitates deletion of a specified file
Send facilitates transfer of a file (typically a CRBasic program file) from
PC memory to CR800 memory.
Retrieve facilitates collection of files viewed in File Control. If
collecting a data file from a CF card with Retrieve, first stop the
CR800 program or data corruption may result.