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1. INTRODUCTION
The Model LC-2 Single Channel Datalogger is a low cost, battery powered and easy to use
measurement instrument designed to read vibrating wire sensors equipped with thermistors.
The 320K standard memory provides storage for 16000 data. Each array consists of an optional
datalogger ID string (16 characters maximum), a timestamp consisting of the year, date (Julian
day or month/day format), time (hhmm or hours/minutes format) and seconds when the reading
was taken. Also included in the data is the internal 3V (or external 12V) battery voltage, the
datalogger temperature, the vibrating wire reading, the temperature at the transducer and the
array number in memory.
Internal math is calculated using 32-bit floating point notation (IEEE). Math operations on the
instrument reading, such as application of a zero reading, gauge factor (or calibration factor) and
offset when using a linear conversion technique or polynomial coefficients when using the
polynomial conversion, provide output directly in engineering units.
2. LC-2 MODEL TYPES
2.1 RS-232 Interface (8002-1-1, 8002-1A-1)
The datalogger’s internal configuration is defined through communication with a computer using
the supplied RS-232 interface cable and LogView software. The datalogger may also be
configured and monitored using any standard terminal emulator software, such as Microsoft
Windows HyperTerminal
™
or Geokon’s Terminal Window Software. (See Section 4, “Command
List”, if using terminal emulator software to interface to the datalogger.)
Sensors connect to model 8002-1-1 by means of an internal terminal block (see Table 1) and to
model 8002-1A-1 by means of a 10-pin connector. Refer to Section 3.1, “Sensor Installation” to
connect the vibrating wire transducer to the LC-2 datalogger.
2.2 USB Interface (8002-1-2, 8002-1A-2)
The datalogger’s internal configuration is defined through communication with a computer using
the supplied USB 2.0 interface cable and LogView software. The datalogger may also be
configured and monitored using any standard terminal emulator software, such as Microsoft
Windows HyperTerminal
™
or Geokon’s Terminal Window Software. (See Section 4, “Command
List”, if using terminal emulator software to interface to the datalogger.)
When connected to a computer via the USB port, the LC-2 appears to the computer as a “virtual”
COM port. The LC-2 datalogger also receives all of its operating power from the computer, thus
extending the internal 3V (or external 12V) battery life. When disconnected from the USB port,
the datalogger automatically switches to the internal 3V (or external 12V) battery pack.
LC-2 model 8002-1-2 provides hard-wired transducer connection by means of an internal
terminal block (see Table 1).LC-2 model 8002-1A-2 provides transducer connection by means of
a 10-pin connector. Refer to Section 3.1, “Sensor Installation” to connect the vibrating wire
transducer to the LC-2 datalogger.
