IPC-TM-650 EN 2022 试验方法1.pdf - 第472页

T ab le 4-I Resolution of TDR Systems TDR System Risetime Resolution 4X Resolution Figure 4-2 Poten tial TDR Step Aberrations overshoot undershoot ringing low frequency drift IPC-TM-650 Page 4 of 23

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Figure 4-1 Resolution and Electrical Length of Transmission Line
t
V
adequate resolution
t
V
inadequate resolution
2 T
p
transmission line
IPC-TM-650
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Table 4-I Resolution of TDR Systems
TDR
System
Risetime Resolution 4X Resolution
Figure 4-2 Potential TDR Step Aberrations
overshoot
undershoot
ringing
low frequency drift
IPC-TM-650
Page 4 of 23
Table 4-2 Impedance Error
Impedance Error
Transmission Line
Impedance
Table 4-3 Connector Torque Specifications
Connector Type Required Torque
Table 4-4 Maximum Suggested Cable Lengths
TDR Cable Assembly TDR Cable Length
IPC-TM-650
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