Omega Engineering Comprehensive Hardware Setup for the Omega Thermocouple Reader

3Hardware Setup

3.2.1 USB-powered Hubs

These hubs draw all power from the host USB connector’s power pins. The power is used for hub internal functions and for the hub’s ports. Each port of a USB-powered hub must be capable of supplying at least 100 mA.

3.2.2 Self-powered Hubs

These hubs draw power from a source other than the host USB connector, with exception that they may draw up to 100 mA from their upstream connection for hub internal functions. The external power is used for hub internal functions and for the hub’s ports. Each port of a self-powered hub must be capable of supplying 500 mA.

3.2.3 Power Adaptors

Power adaptors, also referred to as auxiliary power packs, are required for some self-powered hubs, and for DAQ modules that are powered from USB-powered hubs. In addition, DAQ units will require the use of a power adaptor when used with certain laptops.

NOTE:

When using a power adaptor with your DAQ system, be sure to supply power (from the adaptor to the DAQ unit) before connecting the USB cable. This allows the DAQ to inform the host computer (upon connection of the USB cable) that the unit requires minimal power from the computer.

Power adaptors for use with the DAQ have a current limit of 500 mA (min.) and a voltage range of +7.5 to +12 Volts DC. These specifications are provided on the end-face of the DAQ unit.

If the computer does not recognize the DAQ unit, make sure the computer’s USB port is properly enabled and is in good working order. If the computer still fails to recognize the DAQ unit, the use of an external 9v DC power adaptor may be required.

NOTE:

The use of certain notebook computers may require the use of a power adaptor with your DAQ unit.

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