TB1004 Test Board

A warning note icon. This is a legacy device. The following information is provided as it was documented originally, albeit with some corrections and changes for clarity and style.

A diagram illustrating the layout of the TB1004.

The TB1004 test board is provided for the convenience of evaluating the DS1004 controller (IB1004 + SB1004 boards). The board is basically a loopback, feeding the D/A outputs into the A/D inputs of the DS1004. The schematic diagram of the test board's connections is shown below:

A schematic diagram illustrating the connections of the TB1004.

The voltage outputs of D/A channels 1~4 are connected directly to A/D inputs 1~4 and also to red LEDs 1~4. The brightness of these LEDs is proportional to the voltage on D/A outputs. Obviously, the LEDs will only work for positive output voltages and will stay off for negative voltages. Thus, the LEDs provide indication only for half of the D/As' output range.

The current outputs of the D/A channels are not used at all and can't be tested with the TB1004.

A/D inputs 4~8 are wired into the circuit through adjustable resistors R1~4. The voltage for these resistors comes from D/A output 4. Therefore, the voltages on the central taps of R1~4 are a fraction of the current output of D/A 4.