CDM-A108 & CDM-A116 5V Analogue Input Modules

The CDM-A108 and CDM-A116 are analog input modules that allows easy expansion of Campbell Scientific datalogging systems.

They features a 24-bit, analog-to-digital converter and a low-noise, analog front-end to provide superior analog measurements. This module also supports period average measurements and includes both current and voltage excitation channels.

The CDM-A108 has 8 x differential input while the CDM-116 has 16 x differential input channels.

They both provide 2 x excitation channels, a 12 V and a switched 12 V port for powering peripherals and two switched 5 V ports for peripheral control.

All new units come with a calibration certificate.


All CDM modules are compatible with the CR6 & CR100X datalogger without any additional hardware. To use them with a CR1000, CR800, CR850, or CR3000 datalogger, a SC-CPI (datalogger-to-CPI interface) must also be used.


Key Specifications:

  • Estimated Accuracy:

                 ±(0.04% of reading + offset) 0° to 40°C
                 ±(0.06% of reading + offset) -40° to +70°C
                 ±(0.08% of reading + offset) -55° to +85°C

  • Power Requirements: 9.6 to 32 Vdc voltage
  • Operating Temperature:-40° to +70°C (standard);-55° to +85°C (extended)
  • Dimensions: 20.3 x 12.7 x 5.1 cm 
  • Typical Current Drain: Sleep <1 mA; Active 1 Hz Scan 2 mA (estimated for one single-ended measurement)
  • Voltage Excitation: ±5 V (@ 50 mA)
  • Current Excitation: ±2.5 mA (±5 V compliance voltage)


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