IPC-TM-650 EN 2022 试验方法1.pdf - 第475页
IPC-TM-650 Page 7 of 23
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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IPC-TM-650
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Figure 5-1 Determination of instant in the TDR waveform corresponding to the beginning of the transmission line. A is
the amplitude of the signal reflected from the open end of the probe. SPD is the static protection device (see 4.3.5).
PROBE
SPD
TDR
INSTRUMENT
PRECISION
RF CABLE
TRANSFER
STANDARD
TIME
0.5A
R,1
t
1,TL
A
R,1
Figure 5-2 Determination of instant in TDR waveform corresponding to the end of the transmission line. is the
amplitude of the signal reflected from the open end of the transmission line under test.
SPD
TRANSFER
STANDARD
TDR
INSTRUMENT
TRANSMISSION LINE UNDER TEST
0.5
R2
TIME
t
1,TL
t
2,TL
R2
PRECISION
RF CABLE
IPC-TM-650
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