9323 Hamilton Mentor, Ohio 44060 - USA Tel:+1-440-357-1400 Fax:+1-440-357-1416

Scientific Solutions' - LabMaster BNC8228

The 8228-BNC  Unit for the labMaster DMA provides a convenient "quick disconnect" cable arrangement from the PC Interface to the External ADC in addition to providing screw terminals for all of the labMaster DMA signal connections, and convenient front panel mounted BNC connections.  Compared to the Ribbon Cable Arrangement (another option), it replaces the several ribbon cables with a high-density round cable that permits quick and easy connection between the PC expansion card and the desktop unit.

A special card - the labMaster DMA I/O card, snaps on the back of the labMaster DMA PC Interface and converts the many ribbon cable header connectors to a high density connector, demonstrated by the following pictures:

• labMaster DMA Quick Connect Round Cabling:
• LabMaster DMA PC Interface and I/O card Shown separated
• LabMaster DMA PC Interface and I/O card.
• Shown with high-density cable and 3.5mm cable

With the I/O card attached to the labMaster DMA there are three connections available:

1. High density connector that carries external ADC, Counter/Timer, Digital I/O Port A bits 0-4, Port B bits 0-4
2. 3.5mm (1/8 inch) minijack connector for analog output signals
3. 26 pin header for all Digital I/O signals - comes with internal cable from 26 pin header to standard DB35.

Most applications would connect the High Density connector and the 3.5mm minijack connector.  In this arrangement all signals are available except for Digital Port C and the upper 4 bits of Digital Port A and B.  For those applications that require all the Digital I/O signals, then a cable is connected internal to the computer from the I/O card to a standard DB-25 connector.

labMaster DMA 8228-BNC External ADC Unit:

The 8228-BNC Desktop Unit contains the labMaster ADC board and also a Scientific Solutions custom screw termination unit.

The unit is approximately 11" wide by 2" high by 7" deep.

This unit has a screw terminal pair (signal and ground) for every labMaster DMA signal including:

• Analog Input (16 signals)
• Analog Output (2 signals)
• Digital I/O (24 signals total = 8 Port A + 8 Port B + 8 Port C)
• Counter/Timer (15 signals total = 5 gate + 5 source + 5 out)
• Control Signals - External Start-of-Conversion, +5volts, etc.

The front of the Desktop Unit contains BNC connectors for the following signals:

• Analog Input (8 signals, analog inputs 8 to 15)
• Analog Output (2 signals, analog outputs 0 and 1)
• User Defined (2 User defined signals that can easily be configured for any signal connection)
• Digital I/O (8 signals total = 4 Digital Port A + 4 Digital Port B)

The BNCs and the Screw Terminals can be used simultaneously!

The "User Defined" signals are used as follows: On the front panel are two BNC connectors labeled USR1 and USR2.  On the inside of the unit, these BNC connectors each have two wires (signal/ground) ready to be connected to any of the internal screw terminal positions.  By connecting these BNC wires, you can literally bring any signal you want to the "User Defined" BNC front connections.

The unit connects to the labMaster PC interface using three cables (all supplied with the unit!!):

1. High Density round cable ("quick-connect") for ADC control, Counter/Timer and Digital I/O Port A 0-3, Port B0-3
2. 3.5mm cable - analog output cable
3. . 25 pin round cable - All 24 Digital I/O signals (Port A, B, C)

Most applications only require the High-Density Round Cable and the 3.5mm cable.  The additional 25pin Round Cable is for those applications that require all 24 Digital I/O signals.  The Round Cable Arrangement is much easier to install than using the ribbon cables.  The added convenience of the Screw Terminals and the BNC connectors makes this a very popular option to the labMaster DMA.

The front of the desktop unit contains openings for cables to gain access to the internal screw terminals.  The back of the unit contains the connectors for the labMaster DMA PC Interface.

labMaster DMA 8228-BNC Desktop ADC Unit

Front View - showing BNC connectors and signal wire slots

labMaster DMA 8228-BNC Desktop ADC Unit

Front View - Close Up showing BNC Connectors

labMaster DMA 8228-BNC Desktop ADC Unit

Back View - showing connectors to PC Interface

labMaster DMA PC board connected to Desktop Unit

labMaster DMA PC board connected to Desktop Unit

Close-up View

Close Up view of internal screw terminals

Comparing the size of the 8228-BNC to the LabRack BNC

As can be seen from the photo, the 8228-BNC is a much smaller solution to those applications that do not require all the BNC connectors of the LabRack BNC.  The 8228-BNC is excellent for voltage clamp applications (patchIT, pClamp, etc.).