IPC-TM-650 EN 2022 试验方法.pdf - 第615页
IPC-2-5-19-1-5 Figure 5 Dual T race Oscilloscope Display IPC-TM-650 Number 2.5.19.1 Subject Propagation Delay of Flat Cables Using Dual Trace Oscilloscope Date 7/84 Revision A P a g e4o f4 电子技术应用 ｗｗｗ．ＣｈｉｎａＡＥＴ．ｃｏｍ
IPC-2-5-19-1-2
Figure
3 Cable Preparation and Cable Connection
IPC-2-5-19-1-3
Figure
4 Test Cable Hookup
IPC-TM-650
Number
2.5.19.1
Subject
Propagation
Delay of Flat Cables Using Dual Trace Oscilloscope
Date
7/84
Revision
A
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IPC-2-5-19-1-5
Figure
5 Dual Trace Oscilloscope Display
IPC-TM-650
Number
2.5.19.1
Subject
Propagation
Delay of Flat Cables Using Dual Trace Oscilloscope
Date
7/84
Revision
A
P
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1
Scope
This
test method gives a procedure to determine
crosstalk or the magnitude of disturbance that is coupled to
one conductor when another conductor in a given cable con-
figuration is activated with a pulse.
2
Applicable Documents
None
3
Test Specimen
3.1
3.1
m ± 6.4 m length of cable
4
Equipment/Apparatus
4.1
Fast
rise pulse generator
4.2
Sampling
plug-in in appropriate oscilloscope (see Figure
1) with a high input impedance probe (≥152 m)
4.3
Test
fixture to introduce signal, provide oscilloscope
pickoff points, impedance matching and terminating potenti-
ometers, and a means of connecting sample (see Figure 2)
4.4 Brackets
to hold cable suspended in air and support fix-
ture close to end of cable system
4.5
Styrofoam
with rigid backing for ‘‘stacked’’ crosstalk
(see Figure 3)
4.6
Ohmmeter
5
Procedure
5.1 Setup
5.1.1
Set
pulse generator as follows:
Rep Rate ........................................................... 1 megahertz
Pulse Amp .......................................................... 2 to 5 volts
Pulse Width .................................................... 1 nanosecond
Rise Time .................................................... 2.5 nanosecond
IPC-2-5-21-1
Figure
1 Oscilloscope
IPC-2-5-21-2
Figure
2 Connecting Sample
IPC-2-5-21-4
Figure
3 Crosstalk
The
Institute for Interconnecting and Packaging Electronic Circuits
2215 Sanders Road • Northbrook, IL 60062
IPC-TM-650
TEST
METHODS MANUAL
Number
2.5.21
Subject
Digital
Unbalanced Crosstalk, Flat Cable
Date
3/84
Revision
A
Originating Task Group
Material
in this Test Methods Manual was voluntarily established by Technical Committees of the IPC. This material is advisory only
and its use or adaptation is entirely voluntary. IPC disclaims all liability of any kind as to the use, application, or adaptation of this
material. Users are also wholly responsible for protecting themselves against all claims or liabilities for patent infringement.
Equipment referenced is for the convenience of the user and does not imply endorsement by the IPC.
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