INSTALLATION GUIDE
BNC/TC-2095 Rack-Mount Adapter
This installation guide describes how to install the National Instruments
BNC-2095 and the TC-2095 rack-mount adapters and use them with
SCXI-1100, SCXI-1102/B/C, and SCXI-1104/C modules. The BNC-2095
also can be used with the SCXI-1581.
The BNC-2095 adapter has 32 BNC connectors to connect field signals to
the SCXI module inputs. The TC-2095 adapter has 32 uncompensated
miniconnectors to connect the thermocouples to the SCXI module inputs.
Both the BNC-2095 and TC-2095 adapters have the following features:
•
A 96-pin connector to connect to the SCXI module using an SH96-96
shielded cable or an R9696 ribbon cable
•
Rack-mount construction for use with 19-in. racks
•
A shielded, metal enclosure to minimize noise
The TC-2095 also features isothermal construction to minimize the
temperature gradients across the thermocouple junctions and a
high-accuracy thermistor for cold-junction temperature sensing.
The BNC-2095 and the TC-2095 have pull-up resistors connected between
CH+ and +5 VDC and ground-referencing resistors connected between
CH– and chassis ground through switches located on the rear of the adapter.
The bias resistor is a ground-referencing pull-down resistor for referencing
floating signals; the pull-up resistor is used for open thermocouple
detection. The pull-up resistors enable open thermocouple detection by
detecting saturation in the SCXI module amplifier output and
ground-referenced floating signals.
