IPC-TM-650 EN 2022 试验方法1.pdf - 第473页
T a ble 4-2 Impedance Error Impedance Error T ransmission Line Impedance T a ble 4-3 Connector T orque Specifications Connector T yp e Required T orque T able 4-4 Maximum Suggested Cable Lengths TDR Cable Assembly TDR Cab…
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
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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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Figure 4-3 Reference Airline and Probe Contact Pad
REFERENCE
AIRLINE
PROBE
TRANSFER
STANDARD
PROBE
CONTACT
PAD
ADAPTOR
IPC-TM-650
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