User manual

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2.4.3.2 BNC-2090A Connector Box
NOTE: In WinLTP 1.10 and earlier, the BNC-2090A was used in NRSE recording mode and required
setting the SE/DIFF switches to SI, and the RSE/NRSE to NRSE (Non-Referenced Single Ended). In
WinLTP 1.11 onward the recording mode can now be Differential, NRSE or RSE depending what is
chosen in the Choose Recording Mode radiobutton group (Fig. 2.8.4).
Analog Inputs 0 and 1 (ACH0 and ACH1) are used as normal (plugged into with a shielded BNC cable).
For recording in the Differential mode (Fig. 2.8.4, top), set the SE/DIFF switch to DIFF. It does not
matter what the RSE/NRSE switch is set to because it is not used. 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.
There is no Floating Signal (FS) Source / Ground Signal (GS) Source FS/GS switch in the BNC-2090A. If
you are recording in Differential mode from a Floating Signal Source you will have to have a 10–100 kΩ
resistor to AI GND on one input if DC-coupled, or both inputs if AC-coupled (see the BNC-2090A User
Manual for more information).
If you are recording in Differential mode from a Ground Signal Source you do not have to make any
special connections – just use the factory default configuration (see the BNC-2090A User Manual for
more information).
When recording in Single-Ended mode from a Floating Signal Source, configure the BNC-2090A to
supply a ground reference by placing the device in Referenced Single-Ended (RSE) mode. For
recording in the Referenced Single-Ended (RSE) mode (Fig. 2.8.4, lower right), set the SE/DIFF switch
to SE, and set the RSE/NRSE switch to RSE.
When recording in Single-Ended mode from a Ground Signal Source, the external signal supplies its
own reference ground point and the BNC-2090A should not supply one. Therefore, configure the BNC-
2090A in the Non-Referenced Single-Ended (NRSE) mode (see the BNC-2090A User Manual for more
information). For recording in the Non-Referenced Single-Ended (NRSE) mode (Fig. 2.8.4, lower left),
set the SE/DIFF switch to SE, and set the RSE/NRSE switch to NRSE.
Analog Outputs 0 and 1 (DAC0 and DAC1) are used as normal (plugged into with a shielded BNC cable).
To use the extracellular stimulation outputs, connect a wire from pin DIO0 to User1 (so that the User1
BNC can be S0 output), and connect a wire from pin DIO1 to User2 (so that the User2 BNC can be S1
output).
To use the four Digital Outputs (D2 to D5), directly connect wires to DIO2 to DIO5, respectively.
2.4.3.3 CB-68LPR Connector Block
The CB-68LPR connector block is used to buy the absolutely lowest cost data acquisition board + cable +
connector box/block system for WinLTP, because the BNC connectors of the connector boxes are
surprisingly expensive compared to the screw terminals of the CB-68LPR.