Measurement-computing DBK90 Manual de usuario descargar pdf (Pagina 4)

pg. 4, DBK90 907492 DBK Option Cards and Modules

Open Thermocouple Detection

The DBK90 is equipped with open thermocouple detection for each channel. This means that a broken

thermocouple wire [or otherwise unconnected input] that is measured will result in an off-scale reading.

This is accomplished by applying a small bias current to each of the channel inputs. Whenever a valid

input is absent, the bias current saturates the input amplifier, resulting in the off-scale reading.

Module Configuration

Up to sixteen DBK90 modules can be attached to a single DaqBook/2000 Series device, WBK40, or

WBK41. Since multiple modules are connected via a parallel interface, each must have a unique channel

address.

CAUTION

Adjustment of the channel address must only be performed when the system

power is OFF. Failure to do so may result in equipment damage.

To assign a channel address to the DBK90 module, first locate the DIP switch on the unit’s underside (the

side opposite of the mini-TC connectors). Four micro-switches [on the DIP switch] are used to set the

module’s channel address in binary. After ensuring that the system power is OFF, adjust the micro-

switches to set the desired address. The following figure shows DIP switch settings for the 16 possible

addresses.

DBK90 Channel Address Settings

Each module in the system must have a unique address.

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Measurement-computing DBK90 Manual de usuario Pagina 4