User manual

And either just put the connector in a plastic box (like a simple takeaway box), or if shielding seems

necessary a metal box. If you use a metal box you could also use BNCs with the outer connector

connected to a separate pin.

This is a bit of a pain to install initially (compared the using the BNC 2110), but once its installed you

probably don’t really need to change things around much and it should be fine.

2.4.3.4 BNC-2120 Connector Box

NOTE: In WinLTP 1.10 and earlier, the BNC-2120 was used in NRSE recording mode and required

making connections to AI SENSE and AI GND pins. In WinLTP 1.11 onward the default is now the

Differential recording mode, and no connections need to be made to AI SENSE or AI GND pins. If AI

SENSE is still connected to AI GND after upgrading from WinLTP 1.11, this connection need not be

removed. AI SENSE is not used in the Differential Mode. However, if your BNC shield is connected to AI

SENSE or AI GND, you should disconnect it to get a true differential recording between the cable center

pin and cable shield.

We actually now favour the BNC-2110 Connector Box over the similar BNC-2120 because it is smaller,

cheaper and slightly simpler.

For the BNC-2120, Analog Inputs 0 and 1 are used as normal (plugged into with a shielded BNC cable)

and are recorded in Differential mode (see Section 2.8 and Fig. 2.8.3). Thus for a signal from either a

battery powered biological amplifier or a mains powered and grounded biological amplifier, the center pin

signal and the BNC shield are recorded differentially.

For a Floating Signal (FS) Source such as a signal from a battery powered biological amplifier, switch the

FS/GS switch to FS. For a Ground Signal (GS) Source such as a signal from a mains powered and

grounded biological amplifier, switch the FS/GS switch to GS.

Analog Outputs 0 and 1 are used as normal (plugged into with a shielded BNC cable).

To use the extracellular stimulation outputs, connect a wire from pin P0.0 to User1 (so that the User1

BNC can be S0 output), and connect a wire from pin P0.1 to User2 (so that the User2 BNC can be S1

output).

To use the four Digital Outputs (D2 to D5), directly connect wires to the P0.2 to P0.5, respectively.

2.4.3.5 CA-1000 Connector Box

For the current WinLTP program (version 2.10) using 2 analog inputs, 2 analog outputs, and 6 high-speed

digital outputs, it makes little sense to put together a custom CA-1000 enclosure with a CB-68LPR

connector block and wire up the BNC panelettes. This is particularly true since they massively increased

the cost of the BNC panelettes, making a wired up CA-1000 box not nearly as cost effective as it was

several years ago (see Fig. 2.4.1.2).