Chapter 2
Installation
©
National Instruments Corporation
2-21
VXI-SC-1102 User Manual
Figure 2-1.
VXI-SC-1102 Parts Locator Diagram
Current-Loop Receivers
The VXI-SC-1102 has pads for transforming individual channels to
current-to-voltage converters. National Instruments offers an SCXI
Process Current Resistor Kit of four 249
Ω
, 0.1%, 5 ppm, 1/4 W
resistors. The reference designators for the current loop resistors have
the following format: for input channel x, the resistor is RCLx. For
example, the resistor for channel 28 is RCL28.
Warning: Before installing the resistors in your submodule, make sure that there are
no signals connected to your submodule front connector.
Install the resistors by performing the following steps:
1.
Follow the instructions in the VXI-SC-1000 Carrier Module
Installation Guide to remove the VXI-SC-1102 submodule from
the carrier assembly.
2.
Bend and trim the resistor lead as shown in Figure 2-2. Be sure that
the resistor does not extend more than 0.65 in. above the surface of
the circuit board.
Figure 2-2.
Bent and Trimmed Resistor
3.
Insert the resistor into the appropriate pad, labeled RCLx.
4.
Solder the leads to the pad on the bottom side of the module.
5.
Follow the instructions in the VXI-SC-1000 Carrier Module
Installation Guide to replace the VXI-SC-1102 submodule in the
carrier assembly.
01Title.book : 06Ch2.frm Page 21 Friday, March 21, 1997 3:40 PM
