Power output

The data logger can be used as a power source for communications devices, sensors and peripherals. Take precautions to prevent damage to these external devices due to over- or under-voltage conditions, and to minimize errors. Additionally, exceeding current limits causes voltage output to become unstable. Voltage should stabilize once current is again reduced to within stated limits.

The 12V power outputs differ between the CR1000X and CR1000Xe models. Unlike the CR1000X, the CR1000Xe provides a regulated 12V power output. See 12V Power output comparison between CR1000X and CR1000Xe for details.

12V Power output comparison between CR1000X and CR1000Xe
Port(s) CR1000X CR1000Xe Benefits of
CR1000Xe
12V, SW12-1, SW12-2 Unregulated 12V power directly from the battery; 12V outputs allow up to ~1A per channel, up to 3A per system 12V Regulated 12 Vdc power; 12V outputs allow up to 2A per channel at 3.5A per system Guarantees 12V output to power sensors and peripherals even when a 24V power supply is used
12V over CS I/O Unregulated 12V power over CS I/O port via battery for simpler wiring of CS measurement peripherals and radios Regulated 12V power and SW12 control are accessible via pin 8 of the CS I/O port Allows for a hard power reset on external CS modems without the requirement for an inline device

Additional power outputs include:

  • 5V: regulated 5 ClosedVDC Volts direct current.. The 5 VDC supply is regulated to within a few millivolts of 5 VDC as long as the main power supply for the data logger does not drop below the minimum supply voltage. It is intended to power sensors or devices requiring a 5 VDC power supply. It is not intended as an excitation source for bridge measurements. Current output is shared with the CS I/O port; so, the total current must be within the current limit. See 5 V fixed output specifications.

CAUTION:

For the CR1000X (not CR1000Xe), the voltage levels at the 12V and switched SW12 terminals, as well as pin 8 on the CS I/O port, are tied closely to the voltage levels of the main power supply. Therefore, if 16 VDC is supplied to the POWER IN 12V and G terminals, the 12V, SW12 terminals, and pin 8 on the CS I/O port will also supply 16 VDC to connected peripherals. This could damage any connected peripheral or sensor not designed to handle that voltage.

  • VX terminals: supply precise output voltage used by analog sensors to generate high resolution and accurate signals. In this case, these terminals are regularly used with resistive-bridge measurements (see Resistance measurements for more information). Using the SWVX() instruction, VX terminals can also supply a selectable, switched, regulated 3.3 or 5 VDC power source to power digital sensors and toggle control lines.

  • C terminals: can be set low or high as output terminals . With limited drive capacity, digital output terminals are normally used to operate external relay-driver circuits. See also Digital input/output specifications.

See also Power output specifications .