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Configuration and Installation Chapter 2
SC-2040 User Manual 2-6 © National Instruments Corporation
Supplementary Configuration Information
Power Supply Selection
Set switch SW1 to the INT position to connect the SC-2040 power converter to the +5 V lines on
the MIO-16E board. Set switch SW1 to the EXT position to draw power from an external +5 V
power supply connected to J13.
The MIO-16E is fused to provide 5 W of power (at +5 V and 1 A). The SC-2040 consumes
nearly all of this available power. Therefore, if you have other DAQ accessories that you would
like to power from the MIO, you should switch the SC-2040 to external power and provide an
external +5 V power source. In external power mode, the SC-2040 is fuse limited to 1 A at
+5 V.
Shield Selection
If you are using a rack-mount kit, shield the SC-2040 from unwanted noise by connecting the
analog ground on the board to the metal chassis of the rack using jumper W1. When you set W1
to the SHLD ON position, the jumper connects the analog ground to the metal standoffs used to
mount the board in a rack. In the SHLD OFF position, the SC-2040 analog ground is isolated
from the metal standoffs.
DAQ Board Ground Isolation Selection
You can use jumper W10 to connect the SC-2040 digital and analog grounds. If you are using a
MIO-16E board, you must isolate the grounds by leaving the jumper in its default position.
Gain Selection
The gain selection switches can select gains of 1, 10, 100, 200, 300, 500, 600, 700, and 800 for
each channel, as shown in Table 2-6.
Table 2-6. Gain Switches for Each Channel
Channel Close Switches
0U2
1U6
2U9
3 U14
4 U17
5 U21
6 U24
7 U28