IPC-TM-650 EN 2022 试验方法.pdf - 第640页
IPC-2.5.33.4-2 Figure 2 AC Power Entry Mounting Suggestion Junction Box Duplex Receptacle Ground Fastener Enclosure W all Metal Cover Line Filter AC Line Cord Inside Outside IPC-TM-650 Number 2.5.33.4 Subject Measurement…
1
Scope
The
following information is a supporting docu-
ment in support of Method 2.5.33. The test methods within
this group of procedures can be falsely influenced by radio
frequency interference and electromagnetic interference from
lighting and equipment found in the workplace and testing
area. To avoid these influences, the leakage and transient
tests should be performed in a screen room. In lieu of a
screen room, this test method has been provided to make a
low cost shielded enclosure, which should provide adequate
shielding for the performance of these test procedures.
2
Applicable Documents.
ANSI/J-STD-001
Requirements
for Soldered Electrical and
Electronic Assemblies.
3
Test Specimens
None
required
4
Equipment/Apparatus
Only
general guidelines are pro-
vided. The enclosure can be made from readily available
materials obtainable from any hardware store or lumber yard.
Dimensions may be adjusted up or down to accommodate
equipment to be tested. Experience has shown that best
results will be obtained with a full length piano hinge across
the back of the lid. The lid should be secured in the closed
position with a metal, cam-type locking mechanism. The
screening material from the lid should contact the material
covering the sides to ensure a complete seal.
In addition to information on the enclosure, Section 6 also
includes information on the filtered AC power module and test
electrode mounting that should be incorporated into the local
design to achieve best performance.
5
Procedure
No
construction procedure is provided. Each
local activity should construct the enclosure to meet their spe-
cific needs based on the information in Section 6.
6 Notes
6.1
Shielded Enclosure
High
measuring impedance is
used so as not to load down the signal being generated by
the UUT. Because a high measuring impedance is used,
there’s a threat that transients emanating from sources other
than the UUT might be displayed. To prevent the apparatus
from picking up ambient EMI/RFI, the UUT is placed inside a
‘‘benchtop’’ shielded enclosure. Filtered AC line voltage is
available from within.
Some construction suggestions are given in 6.2 and 6.3.
6.2
Basic Enclosure
Although
Figure 1 illustrates wire
mesh walls, sheet metal walls also work. Metals other than
copper or brass may be used. If mesh is used, it should be
6.5 mm or tighter weave. Whatever metallic materials are
used, continuity across seams and to the lid should be
ensured.
Figure 2 suggests a way for mounting to an AC power entry.
6.3
Test Electrode
The
test electrode (see Figure 3) is
shown mounted to the sidewall of the enclosure to facilitate
connection of test equipment to the UUT. Moving this struc-
ture entirely into shielded enclosure and providing an access
port through which test cables may be routed will slightly
increase the construction cost, but will also serve to better
isolate the test setup.
IPC-2.5.33.4-1
Figure
1 Enclosure Construction Suggestion
51 cm
81 cm
43 cm
LID
WOOD
SHEET
METAL
OR WIRE MESH
The
Institute for Interconnecting and Packaging Electronic Circuits
2215 Sanders Road • Northbrook, IL 60062
IPC-TM-650
TEST
METHODS MANUAL
Number
2.5.33.4
Subject
Measurement
of Electrical Overstress from
Soldering Hand Tools - Shielded Enclosure
Date
11/98
Revision
Originating Task Group
Manual Soldering Task Group (5-22c)
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.
P
age1of3
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IPC-2.5.33.4-2
Figure
2 AC Power Entry Mounting Suggestion
Junction
Box
Duplex
Receptacle
Ground
Fastener
Enclosure
W
all
Metal
Cover
Line
Filter
AC Line
Cord
Inside
Outside
IPC-TM-650
Number
2.5.33.4
Subject
Measurement
of Electrical Overstress from Soldering Hand
Tools - Shielded Enclosure
Date
11/98
Revision
P
age2of3
电子技术应用 ｗｗｗ．ＣｈｉｎａＡＥＴ．ｃｏｍ
IPC-2.5.33.4-3
Figure
3 Test Electrode Mounting Suggestion
MET
AL
ENCLOSURE WALL
WIRE LOOPS
TO CONNECT SCOPE
PROBE AND GROUND CLIPS
OutsideInside
TEST
ELECTRODE
BOARD
DUAL READOUT
PANEL MOUNT
EDGE CARD CONNECTOR
IPC-TM-650
Number
2.5.33.4
Subject
Measurement
of Electrical Overstress from Soldering Hand
Tools - Shielded Enclosure
Date
11/98
Revision
P
age3of3
电子技术应用 ｗｗｗ．ＣｈｉｎａＡＥＴ．ｃｏｍ