Campbell Scientific CR10X CR10X Measurement and Control System - Page 16
V, Power Ground G,
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CR10X OVERVIEW OV1.1.1 ANALOG INPUTS The terminals labeled 1H to 6L are analog inputs. These numbers refer to the high and low inputs to the differential channels 1 through 6. In a differential measurement, the voltage on the H input is measured with respect to the voltage on the L input. When making singleended measurements, either the H or L input may be used as an independent channel to measure voltage with respect to the CR10X analog ground (AG). The single-ended channels are numbered sequentially starting with 1H; e.g., the H and L sides of differential channel 1 are single-ended channels 1 and 2; the H and L sides of differential channel 2 are single-ended channels 3 and 4, etc. (The blue single-ended channel numbers do NOT appear on older wiring panels). OV1.1.2 EXCITATION OUTPUTS The terminals labeled E1, E2, and E3 are precision, switched excitation outputs used to supply programmable excitation voltages for resistive bridge measurements. DC or AC excitation at voltages between -2500 mV and +2500 mV are user programmable (Section 9). OV1.1.3 PULSE INPUTS The terminals labeled P1 and P2 are the pulse counter inputs for the CR10X. They are programmable for high frequency pulse, low level AC, or switch closure (Section 9, Instruction 3). OV1.1.4 DIGITAL I/O PORTS Terminals C1 through C8 are digital Input/Output ports. On power-up they are configured as input ports, commonly used for reading the status of an external signal. High and low conditions are: 3V < high < 5.5V; -0.5V < low < 0.8V. Configured as outputs the ports allow on/off control of external devices. A port can be set high (5V ± 0.1V), set low (