Operation
35
USB-2401
Figure 3-10: 2-Wire Resistance Connection
3.4
AI Data Format
The acquired 24-bit A/D data is 2’s complement coded data for-
mat. Valid input ranges and optimum transfer characteristics are
as shown.
Table 3-1: Analog Input Range and Output Digital Code
Description
Bipolar Analog Input Range
Digital
Code
Full-scale
range
±25 V
±12.5 V
±2.5 V
±0.3125V
N/A
Least
significant bit
2.98uV
1.49uV
0.298uV
0.037uV
N/A
FSR-1LSB
24.999997
V
12.4999985
V
2.4999997
V
0.3124999V
7FFFFF
Midscale
+1LSB
2.98uV
1.49uV
0.298uV
0.037 uV
000001
Midscale
0 V
0 V
0 V
0 V
000000
Midscale
-1LSB
-2.98uV
-1.49uV
-0.298uV
-0.3124999uV
FFFFFF
-FSR
-25 V
-12.5 V
-2.5 V
-0.3125V
800000
ADC
MUX
Resistor
X
X
SC +
SC -
0.05mA
USB-2401
Summary of Contents for USB-2401
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Page 22: ...12 Introduction Figure 1 3 USB 2401 Module Side View...
Page 23: ...Introduction 13 USB 2401 Figure 1 4 USB 2401 Module Front View 41 3 114...
Page 25: ...Introduction 15 USB 2401 Figure 1 7 Module In Stand Front View...
Page 26: ...16 Introduction Figure 1 8 Module Stand Top View 20 4 20 4 B 26...
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Page 34: ...24 Getting Started Figure 2 4 Module Pre Rail Mounting Figure 2 5 Module Rail Mounted...
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