Measurement Computing DaqBoard 3000USB Series - Manual (Page 13)

DaqBoard/3000USB Series Installation Guide 968492 IG-7
Scenario 2: Using a TB-100
In this setup a TB-100 screw-terminal board option is connected to the 68-pin SCSI connector via a
CA-G56 shielded cable. However, the use of other cables is possible as noted below. In this example we
can also see that 4 thermocouples are connected at TB7 (on the /3000USB board). This means that 8
analog channels [to obtain 4 differential TC channels] are required (see following figure). Redundant
connections must be avoided. A CA-179-x USB cable is used to connect the /3000USB Series board to
a USB port on the host PC. USB2.0 is recommended.
WARNING !
Before connecting TC wires, ensure that the
associated analog channels are not in use. Failure
to do so could possibly cause equipment damage
and/or personal injury.
The TB7 terminal block can be used to connect up to 4
thermocouples. The first TC channel makes use of Analog
Channel 0 for its positive (+) lead and Analog Channel 8 for its
negative (-) lead. The second TC channel uses analog Channels 1
and 9, and so on, as indicated in the pinout to the left.
In DaqBoard/3000USB Series applications, thermocouples should only be
connected in differential mode. Connecting thermocouples in single-ended mode
can cause noise and false readings. Appendix B of the user’s manual includes
additional information.
As in all scenarios, a CA-179-x USB cable is used to connect the /3000USB Series board to a USB2.0 port
on the host PC.
* Any of the following 68-conductor expansion cables can be used to connect the TB-100 option the SCSI
connector:
CA-G55 3 feet, ribbon cable.
CA-G56 3 feet, shielded expansion cable.
CA-G56-6 6 feet, shielded expansion cable.