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Custom Sensors
To create custom-designed sensors or other circuits for the analog input channels, the
sonic input channel, the digital input channel, or the digital output channel on the
CBL 2, you can purchase sensor kits from TI (
For a custom analog sensor, use the Analog Probe Kit (order entry no. CBL/CA/D).
Each sensor kit includes a four-foot length of telephone cable with a connector
attached to one end. The other end of the cable is not terminated.
For a custom digital sensor, cut a CBR-to-CBL cable (order entry no. CBR/CA/C) into
two pieces to get two lengths of cable with connectors. (The digital probe kit used
with the original CBL will not work with CBL 2.)
For a custom digital ID probe, contact Vernier Software and Technology
(
www.vernier.com
Be very careful when designing a custom sensor or circuit. For more accurate operation,
do not connect pins 1 and 6 together on the analog input channels. Pin 1 on the British
Telecom-style connector is the pin farthest from the release lever as shown in the
pictures below.
If you design a resistance-type sensor, connect pin 3 (Vres) to pin 6 (Vin-low) (refer to
"Connector Pinouts" below). Connect the resistance to be measured from the junction
of these pins to pin 2 (Gnd). The resistance range for useful measurements is limited
from approximately 1 Kohms to 100 Kohms.
When the Operation parameter in Command 1 (page 23) is set to 2, 3, 5, 6, or 7, the
data is measured on the Vin pin (pin 1). The data for all other operations is measured
on the Vin-low pin (pin 6).
Note: The most current that can be drained from all three analog channels is 160 mA. This is
limited by the hardware.
CBL 2 Technical Reference
) for more information.
) or its Instructional Dealers.
1-800-TI-CARES
15
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