BNC/TC-2095 Rack-Mount Adapter Installation Guide
6
ni.com
Caution
Connecting an external ground-referenced signal with the 10
Ω
resistor network
in place can cause permanent damage to the resistor network and the traces on the
BNC/TC-2095 printed circuit board. NI is
not
liable for any damage or injuries resulting
from improper signal connections. Refer to the
Temperature Sensor Output and Accuracy
section for more information.
Connecting the BNC/TC-2095 to the SCXI Module
Complete the following steps to mount the SH96-96 cable assembly and
connect the BNC/TC-2095 to the SCXI module. Refer to Figures 1 and 2
as needed.
Floating
thermocouple or
signal
No
BNC-2095 or
TC-2095—Use this setting
when the signal or
thermocouple is floating
and you want to disable
open-thermocouple
detection.
Ground-referenced
thermocouple or
signal
Yes
BNC-2095—Use this
setting for detecting
ground-referenced 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 for
ground-referenced
thermocouples.
Table 1.
Configuring Open-Thermocouple/Signal Detection and Signal Ground-Referencing (Continued)
Switch Settings
Signal Type
Detects
Open
Thermocouple
Comments
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
