Programming
Chapter 5
SCXI-1100 User Manual
5-4
© National Instruments Corporation
To measure the output of the amplifier in the Calibration mode, perform the following steps:
1. Write the binary pattern
XXXGGGGG 00XXXXXX 1M001000
to the SCXI-1100
Configuration Register where:
M
=
0
if the amplifier inputs are to be grounded.
M
=
1
if the amplifier inputs are to be connected to Analog Bus 2.
2. Measure the voltage with the data acquisition board.
Indirect Measurements
Measurements from Other Modules
To perform measurements from other modules, you must cable the SCXI-1100 rear signal
connector to a data acquisition board. See Chapter 2, Configuration and Installation, for more
information. To make a measurement from another module, perform the following steps:
1. Perform any necessary programming to ensure that no modules are driving Analog Bus 0.
For an SCXI-1100, clear AB0EN in the Configuration Register to ensure that its output is not
driving AB0.
2. Write the binary pattern
XXX00000 00XXXXXX 00101011
to the SCXI-1100
Configuration Register. This step disables the SCXI-1100 from driving Analog Bus 0 and
allows Analog Bus 0 to drive MCH0 through the output buffer.
3. Program the other module to drive Analog Bus 0 with the signal to be measured.
4. Measure the voltage with the data acquisition board.
Measurements from the SCXI-1100 via Another Module
To perform measurements via another module, you must cable the other module rear signal
connector to a data acquisition board. The other module must be able to transfer Analog Bus 0 to
the data acquisition board. See Chapter 2, Configuration and Installation, for more information.
To measure one of the 32 differential input channels of the SCXI-1100, perform the following
steps:
1. Perform any necessary programming to ensure that no modules are driving Analog Bus 0.
For an SCXI-1100, clear AB0EN in the Configuration Register to ensure that its output is not
driving AB0.
2. Program the other module not to drive Analog Bus 0, but to send Analog Bus 0 to the data
acquisition board.
3. Write the binary pattern
XXXGGGGG 00XCCCCC 00001010
to the SCXI-1100
Configuration Register.
4. Measure the voltage with the data acquisition board.
