Chapter 2
Using the SCXI-1530/1531
©
National Instruments Corporation
2-3
Figure 2-2.
SCXI-1530/1531 Module Block Diagram
Making Signal Connections
This section recommends how to connect signals to the SCXI-1530/1531.
With the SCXI-1530/1531 modules, you can make precise acceleration
measurements using current-excited accelerometers, such as ICP
accelerometers. The floating (non-referenced) current sources provide
excitation for the accelerometers. The SCXI-1530/1531 modules allow you
to perform all the following operations:
•
Configure each input to be single-ended or differential to
accommodate both non-referenced or ground-referenced transducers.
•
Independently program the AC-coupled amplifiers to different gains to
extend the range of usability for a given accelerometer.
•
Configure the lowpass filter of each channel to one of four bandwidths
to reject signals outside of the desired frequency range.
•
Simultaneously sample and hold all four or eight channels to preserve
phase information.
SCXIbus
Interface
Sample/Hold
Lowpass
Filter
A
C
Coupling
Instrumentation
Amplifier
+
–
Current
Source
CH0+
CH0–
Sample/Hold
Lowpass
Filter
A
C
Coupling
Current
Source
CH
X+
CH
X–
X
-to-1 Multiple
x
e
r
F
ront Signal Connector
Gain
X Control
Gain 0 Control
Calibration EEPROM
Configuration
Register
Multiple
x
e
r
Buffer
Switch
Rear Signal Connector
SCXIb
us Connector
Digital Control
SCXI-1530 has 4 Channels
SCXI-1531 has 8 Channels
X represents a variable that is dependent on the module
Instrumentation
Amplifier
+
–