National Instruments BNC -2140 - Manual (Page 10)

© National Instruments Corporation 2-1 BNC-2140 User Manual
2
Installation and Configuration
This chapter explains how to install and configure your BNC-2140
accessory.
Installation
Caution You must turn the power off to your computer before installing the BNC-2140.
The following are general installation instructions:
1. Insert either end of your SHC68-C68-A1 analog cable into the 68-pin
connector on the BNC-2140. Insert the other end into the 68-pin
connector on the DSA plug-in device.
2. Tighten the jackscrews finger-tight on both ends of the cable.
3. Check the installation.
4. Turn on your computer.
The BNC-2140 accessory is now installed.
Device Configuration
You must manually configure the BNC-2140 accessory by setting the
channel switches. You can configure each input channel to have ICP signal
conditioning enabled or disabled, and for DIFF and SE measurements.
When ICP signal conditioning is enabled large DC offset voltages can
occur on signal inputs due to the output bias voltage requirements of the
ICP transducer you are using. To remove this offset you must enable
AC coupling on the affected input channels of the DSA device. You can
also configure each output channel for DIFF or SE measurements. You can
turn the power on or off for the ICP signal conditioning circuitry. If you do
not require ICP signal conditioning, turn off the ICP power. Refer to
Figure 2-1 for the location of the switches.
Note You can connect or disconnect BNC cables carrying signals without turning off the
computer.