Operation
29
content of the input signals is to be rejected. AC coupling enables a high
pass R-C filter through the input signal path, with corner frequency
(-3dB) about 0.4 Hz.
IEPE Input
For applications utilizing sensors such as accelerometers or micro
-
phones, the USB-62405 provides an excitation current source.
The excitation current is 2 mA for the IEPE sensors, with DC voltage off
-
set generated because of the excitation current and sensor impedance.
When enabling IEPE current sources, the USB-62405 automatically sets
input configuration to AC coupling.
Figure 3-3: Excitation Current for IEPE Sensor Measurement
3.2.2
AI Data Format
When an A/D converter is used, properties of the signal to be measured
must be ascertained to determine the channel to be used and connec
-
tions to the card. After A/D conversion, the A/D data is buffered in a
Data FIFO, for transfer to memory for further processing. Transfer char
-
2mA
Constant
Current
VCC
IEPE ON/
OFF
AI Channel
6
Summary of Contents for USB-62405
Page 2: ...ii...
Page 8: ...viii List of Figures This page intentionally left blank...
Page 10: ...x List of Tables This page intentionally left blank...
Page 19: ...Introduction 9 Figure 1 2 USB 62405 Module Front View Figure 1 3 USB 62405 Module Side View...
Page 22: ...12 Introduction Figure 1 6 Module Stand Wall Mount Kit Side View w Connections...
Page 23: ...Introduction 13 Figure 1 7 Module In Stand Front View...
Page 24: ...14 Introduction Figure 1 8 Module Stand Top View 20 4 20 4 B 26...
Page 31: ...Getting Started 21 Figure 2 4 Module Pre Rail Mounting...
Page 32: ...22 Getting Started Figure 2 5 Module Rail Mounted...
Page 34: ...24 Getting Started Figure 2 7 USB 62405 Module with Wall Mount Apparatus...
Page 36: ...26 Getting Started This page intentionally left blank...
Page 58: ...48 Getting Service...
