Campbell Scientific CR10X CR10X Measurement and Control System - Page 85
Measurement Programming Examples
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SECTION 7. MEASUREMENT PROGRAMMING EXAMPLES This section gives some examples of Input Programming for common sensors used with the CR10X. These examples detail only the connections, Input, Program Control, and Processing Instructions necessary to perform measurements and store the data in engineering units in Input Storage. Output Processing Instructions are omitted (see Section 8 for some processing and program control examples). It is left to the user to program the necessary instructions to obtain the final data in the form desired. No output to final storage will take place without additional programming. The examples given in this section would likely be only fragments of larger programs. In general, the examples are written with the measurements made by the lowest numbered channels, the instructions at the beginning of the program table, and low number Input Storage Locations used to store the data. It is unlikely that an application and CR10X configuration exactly duplicates that assumed in an example. These examples are not meant to be used verbatim; sensor calibration, input channels, and input locations must be adjusted for the actual circumstances. Unless otherwise noted, all excitation channels are switched analog output. 7.1 SINGLE-ENDED VOLTAGE/ SWITCHED 12 V TERMINAL - CS500 The CS500 is a modified Vaisala 50Y Humitter temperature and relative humidity sensor. It has high level linear output of 0 to 1 V for the temperature range of -40° to +60°C and relative humidity of 0 to 100%. It is measured with Instruction 1 (Volts SE). The multiplier for temperature is found with the following relationship [60°C - (-40°C)] / [1000 mV - 0 mV] = 0.1°C/mV. The offset is -40°C. The multiplier for relative humidity is [100 % - 0 %] / [1000 mV - 0 mV] = 0.1 %/mV and the offset is 0 %. The CS500 is powered by the CR10X's 12 V battery and draws