©
National Instruments Corporation
5
BNC/TC-2095 Rack-Mount Adapter Installation Guide
Configuring Open-Thermocouple/Signal Detection and Signal
Ground-Referencing
Refer to Table 1 to configure the BNC/TC-2095 for operating with
open-thermocouple or signal detection, and for properly
ground-referencing the signals.
Table 1.
Configuring Open-Thermocouple/Signal Detection and Signal Ground-Referencing
Switch Settings
Signal Type
Detects
Open
Thermocouple
Comments
Floating signal or
thermocouple
Yes
BNC-2095—Use this
setting for detecting
floating signals or open
signal leads. When
detecting open signal
leads, the positive input is
pulled to +5 VDC if the
measured signal is
<5 VDC. Only use this
setting or configuration
with signals between
±5 VDC.
TC-2095—Use this setting
to detect open
thermocouples and when
the thermocouple is
floating.
Ground-referenced
signal or
thermocouple
No
BNC-2095 or
TC-2095—Use this setting
when the signal or
thermocouple is
ground-referenced and
you want to disable
open-thermocouple
detection.
1
O
N
23
4
56
78
GND REF
CH
OFF
ON
PULL-UP
GND REF
PULL-UP
GND REF
PULL-UP
GND REF
PULL-UP
3
2
1
0
1
O
N
23
4
56
78
GND REF
CH
OFF
ON
PULL-UP
GND REF
PULL-UP
GND REF
PULL-UP
GND REF
PULL-UP
3
2
1
0
