User manual

However, future versions of WinLTP will include at least 5 analog inputs, 4 analog outputs, 8 to 24 high-

speed digital outputs, and maybe 8 low-speed digitial outputs. For this you can use either two BNC-

2110’s, two BNC-2120’s, two BNC-2090A’s or using the CA-1000 enclosure (with BNC panelettes and

two CB-68LPR connector blocks). So wiring up a CA-1000 is not completely unreasonable.

Installation is pretty easy and requires only a supplied screwdriver. Install 9 panelettes in front, and the

CB-68LPR connector block in the back left or right position. Connect the wires as shown using the PCI-

62xx data sheet pinout information.

If you are recording in Differential mode (Fig. 2.8.5, top), then you can:

1) connect the central pin of the AnalogInput 0 BNC to AI0 (pin 68), and

2) connect the shield wire of the BNC to AI8 (pin 34)

and so forth.

If you are recording in Non-Referenced Single-Ended (NRSE) mode (Fig. 2.8.5, lower left) (which was

the recording mode of WinLTP 1.10 and earlier), you can:

1) connect the central pin of the AnalogInput 0 BNC to AI0 (pin 68).

Then you can either:

2a) connect the shield wire of the BNC to AI SENSE (pin J62). This is to remove any ground loops and

is theoretically the better way, or,

2b) connect AI GND (say pin J29) to AI SENSE (pin J62). Then connect the shield wire of the BNC to

an AI GND pin (say J67). You may have to disconnect the grounded shield of the Analog Input 0

coaxial cable from the Analog Input 0 BNC ground to prevent a ground loop – alternatively in this

situation leave the shield wire of the BNC unconnected).

2.4.4. USB Boards

If WinLTP users wish to have an acquisition board that that be used with laptop computers, or one that

perhaps will have a slightly less chance of becoming obsolete (the USB bus having more longevity that

the PCIexpress bus), they can choose the USB National Instruments boards. The downside is that the

USB boards compared with PCIexpress boards are like-for-like quite a bit more expensive (Fig. 2.4.1.2).

The USB-6341 (with screw terminals, Fig. 2.4.4.1 top) is one of the most cost effective USB boards that

National Instrument sells. The screw terminal connections should be done with the same functionality as

with the CB-68LPR but with the different pinout numbers (see Section 2.4.3.3).

For those that want BNC connectivity (and are willing to pay the additional cost), the M-Series USB-6221

BNC has been used by many WinLTP users. The current X-Series board replacement of that board is the

USB-6341 BNC (Fig. 2.4.4.1 bottom).

The National Instruments M- and X-series manuals say that the M- and X-Series USB board’s chassis

ground must be connected to earth ground by a ground lug screw or (on USB BNC boards) by the CHS

GND pin. You can also connect your cable’s shield wire to this chassis ground for a ground connection.