IPC-TM-650 EN 2022 试验方法.pdf - 第13页

Three main elements must be considered in planning how to obtain test data at room ambient conditions. These are: 1. The set-up for supporting and operating the test equip- ment. 2. The instrumentation for measuring the …

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All
equipment used for performing or supporting the tests shall
be calibrated before being put into service. The test facility
shall have an established program and procedure for the
regular calibration of its equipment.
A calibration program should include a system for selecting,
using, calibrating, checking, controlling and maintaining mea-
surement standards, reference materials used as measure-
ment standards and measuring and test equipment used to
perform tests described in this manual.
2215
Sanders Road
Northbrook, IL 60062-6135
IPC-TM-650
TEST METHODS MANUAL
Number
1.2
Subject
Calibration
Date
01/03
Revision
A
Originating
Task Group
N/A
Material
in this Test Methods Manual was voluntarily established by Technical Committees of 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 IPC.
P
age1of1
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Three
main elements must be considered in planning how to
obtain test data at room ambient conditions. These are:
1. The set-up for supporting and operating the test equip-
ment.
2. The instrumentation for measuring the data from the tests.
3. The instrumentation for measuring and recording room
conditions at the time of the test.
This last factor is important when comparing test data
obtained at different times or facilities. In most cases, this step
consists of simply recording the barometric pressure, relative
humidity and temperature at the time of the test. If other con-
ditions are found to have a significant impact on the test data
these conditions should be recorded as well.
Unless otherwise specified in the applicable test method, indi-
vidual standard or specification, all laboratory ambient tests
shall be made under the following conditions:
1. Temperature: 15 °C to 35 °C [59 °F to 95 °F]
2. Relative Humidity: 35 % to 75 %
Whenever these conditions must be closely controlled to
obtain reproducible results or for referee purposes, tests shall
be conducted under the following conditions:
1. Temperature: 22 °C±3°C[72°F±5°F]
2. Relative Humidity: 50%±10%
2215
Sanders Road
Northbrook, IL 60062-6135
IPC-TM-650
TEST METHODS MANUAL
Number
1.3
Subject
Ambient
Conditions
Date
01/03
Revision
A
Originating Task Group
N/A
Material
in this Test Methods Manual was voluntarily established by Technical Committees of 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 IPC.
P
age1of1
ASSOCIATION CONNECTING
ELECTRONICS INDUSTRIES
®
The
recognition of the effect of the test procedure on the test
results must be carried into the examination of the data
obtained from the test. The meaning of the data must be ana-
lyzed against the background of the procedure for obtaining it.
In addition, some general considerations apply in examining
the data.
The extent to which usable data can be selected from the test
results is influenced by how well the log of the test has been
kept. The original data sheet should be marked at all ques-
tionable data points. If the reason for questioning a data point
can be determined, it should be noted in the test log. Causes
for questioning a data point can include changing the opera-
tor or observer, exceeding the range on an indicator, replac-
ing test leads that shook loose, or any other incident consti-
tuting a deviation from the planned test procedure.
Of equal importance to the test results and much more diffi-
cult to detect are questionable data points unaccompanied by
a notation in the test log. Additionally, it is often useful to per-
form all calculations soon after conducting the test. When
results are suspect, it is almost always easier to perform a root
cause analysis during or immediately after the test. The prob-
lem is to distinguish between a divergent point caused by the
specimen being tested and one caused by improper use of
the test method. Only by an intensive re-examination of the
test set up can this problem be answered. Some of the poten-
tial causes of divergence are:
• Instruments subjected to an environment for which they are
not calibrated
• Thermocouple opening
• Instruments operated without sufficient warm up
• Incorrect sequencing of the test circuit
• Hook ups to the wrong circuit
• Operator error
2215
Sanders Road
Northbrook, IL 60062-6135
IPC-TM-650
TEST METHODS MANUAL
Number
1.4
Subject
Reporting,
General
Date
01/03
Revision
A
Originating Task Group
N/A
Material
in this Test Methods Manual was voluntarily established by Technical Committees of 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 IPC.
P
age1of1
ASSOCIATION CONNECTING
ELECTRONICS INDUSTRIES
®