Campbell Scientific CS110 Electric Field Meter - Manual (Page 10)

CS110 Electric Field Meter
Unlike traditional rotating vane field mills, the CS110 uses a reciprocating
shutter. A stepper motor opens and then closes the reciprocating shutter by 45
°
during measurements. The reciprocating shutter is electrically connected to
ground potential by a flexible stainless-steel strap operated below its fatigue
limit, resulting in an ultra-reliable electrical ground connection. The CS110
offers improved dc error performance, as compared with traditional rotating
vane field mills, by utilizing a zero field (closed shutter) reference for each
measurement. Power consumption is also reduced (< 1 Watt for 1
measurement per second) in the CS110 by de-energizing the motor coils in
between measurements.
1.2 CR1000 Datalogger
The CS110 contains an embedded CR1000 datalogger, which provides
measurement and control functions, data processing and storage, a user
interface language (CRBasic
™), and flexible communications options.
LoggerNet ™ PC software (purchased separately) provides versatile networking
and data collection capabilities. For more details on the CR1000 datalogger
see the CR1000 Measurement and Control System Operator’s Manual.
1.3 Meteorological Inputs
The CS110 interfaces to various meteorological sensors resulting in an
automated weather station that includes atmospheric electric field. Wind speed
and direction, air temperature and relative humidity, rainfall, solar radiation or
barometric pressure sensors interface directly to the CS110. Measurement
details of the various sensors are given in section 7.
1.4 Communication and Data Storage
The circular RS-232 connector on the underside of the CS110 can be used to
interface directly to RS-232 devices (DTE or DCE), utilizing the CS110
RS-232 cable (CS110CBL1-L).
The circular CS I/O connector on the underside of the CS110 can be used to
interface directly to various Campbell Scientific, Inc. peripherals, utilizing the
CS110 CS I/O cable (CS110CBL2-L). Examples of CS I/O peripherals include
the CR1000 Keyboard Display and the COM220 phone modem.
The DB9 end of CS110 RS-232 cable and CS110 CS I/O cable won’t fit through
the conduit used on some enclosures, whereas the smaller circular end that
connects to the CS110 will.
The embedded CR1000 will have either 2 MB (PN: 18292) or 4 MB (PN:
18293) of battery-backed SRAM and 16K Flash EEPROM. The operating
system and user programs are stored in Flash EEPROM. Memory not used by
the operating system and user program is available for data storage. The size
of available memory can be seen in the Status Table discussed in Appendix B
of the CR1000 manual.
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