Part 2

Plug-In Assembly Configuration 509In contrast to the other plug-in assemblies, Option 140 provides a "breadboard" forthe design engineer or technician to custom design circuits for use with the 3497Aor 3498A.You can use Option 140 when you have a specialized measurement or control applicationwhich can't be satisfied by using the other option card assemblies. Possi-ble applications include matrix and RF switches; multichannel totalizers and steppermotor controllers.Instructions can be sent to the Breadboard Card assembly and data read from theassembly at a rate of 20 individual operations per second using the -hp- 85 and 90operations per second using the -hp- 9826 computer.DescriptionThe breadboard card assembly is shown in Figure 152. The board has three grid networksto mount components (ICs, resistors, capacitors, etc.). Two of the grids arelabeled ANALOG SECTION and DIGITAL SECTION. Either grid, however, can be usedfor either type of circuit depending on requirements. The third grid can be used asan extension of the Analog and/or Digital grids, or (if a terminal card is used) canbe cut off and removed.Interconnected holes across both the top and bottom of each grid form buses forpower supply and ground connections. The analog grid has two power supply andtwo ground buses which can be used to connect two power supplies. Or, by usingtwo jumpers, a single power supply bus can be configured.Analog SectionThe analog section of the assembly pertains to 3497A backplane signals which arecontrolled by the ANALOG command group (e.g., AC chan#,chan#,..). The controlsignals themselves are digital in nature. The result of executing an analog command,however, may return an analog result, such as a voltmeter reading using the HI COM,LO COM and GUARD COM lines. The analog section also contains two differentpower supply references.Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com