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©
National Instruments Corporation
7
SCXI-1303 Installation Guide
Warning
Connecting an external ground-referenced signal with the 10
Ω
bias resistor
network in place may cause permanent damage to the resistor network and the
traces on the SCXI-1303 printed circuit board. National Instruments is
NOT
liable
for any damage or injuries resulting from improper signal connections.
Signal Connection
When connecting your signals to the SCXI-1303, follow the labeling on the
SCXI-1303 for the appropriate module, as indicated in Figure 4.
To connect the signal to the terminal block, perform the following steps,
referring to Figures 3 and 4 as necessary:
1.
Unscrew the top cover screws and remove the cover.
2.
Loosen the strain-relief screws and remove the strain-relief bar.
3.
Run the signal wires through the strain-relief opening. You can add
insulation or padding if necessary.
4.
Prepare your signal wire by stripping the insulation no more than
7 mm.
Table 2.
Selecting the Appropriate Resistor Networks
Module
Bias Resistor
Pullup
Resistor
Source
Impedance
Signal
(Floating or
Ground-
referenced)
Open
Thermocouple
Detection?
Comments
SCXI-1102
/B/C
10 M
Ω
10 M
Ω
Low
Both
Yes
Recommended
configuration for the
SCXI-1102/B/C
10
Ω
10 M
Ω
Low
Floating
Yes
Factory-shipping
configuration
10
Ω
None
High or low
Floating
No
—
None
None
High or low
Ground-
referenced
No
—
SCXI-1100
10 M
Ω
10 M
Ω
—
—
—
Not recommended
10
Ω
10 M
Ω
Low
Floating
Yes
Factory-shipping
configuration
10
Ω
None
High or low
Floating
No
—
None
None
High or low
Ground-
referenced
No
—
low source impedance
≤
50
Ω
high
source impedance >50
Ω
Содержание SCXI-1303
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