34
Operation
Figure 3-9: 2-wire RTD Connection
3.3.6
Wire Resistance Mode
The USB-62401 can source precision 0.05 mA excitation current to the
resistor to be measured and use a 2.5V input range to acquire cross-volt
-
age on the resistor. The formula of voltage to resistance conversion is:
Since the excitation current can only drive the cross-voltage up to 1.5V
with good linearity, the maximum equivalent value of the resistor is lim
-
ited to 30kΩ.
0.00005
V(volt)
)
(
=
Ω
R
Summary of Contents for USB-62401
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 21: ...Introduction 11 Figure 1 3 USB 62401 Module Side View...
Page 22: ...12 Introduction Figure 1 4 USB 62401 Module Front View...
Page 24: ...14 Introduction Figure 1 7 Module In Stand Front View...
Page 25: ...Introduction 15 Figure 1 8 Module Stand Top View 20 4 20 4 B 26...
Page 29: ...Introduction 19...
Page 30: ...20 Introduction This page intentionally left blank...
Page 34: ...24 Getting Started Figure 2 4 Module Pre Rail Mounting Figure 2 5 Module Rail Mounted...
Page 36: ...26 Getting Started This page intentionally left blank...
Page 43: ...Operation 33 Figure 3 7 4 Wire RTD Connection Figure 3 8 3 Wire RTD Connection...
Page 56: ...46 Calibration This page intentionally left blank...
Page 62: ...52 Getting Service...
