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User Maintenance
Description
Description
Necessity of User Maintenance
Through repeated use, the fixture's measuring performance will gradually deteriorate over
time due to smearing on the contact faces from solder buildup, and to mechanical wear and
deformation of the contact faces themselves. To continually achieve optimal measurement
results, it is important to keep the contact faces in good condition and take appropriate
action before such wear or deformation occurs. Therefore, the fixture should be properly
cared for by implementing each of the maintenance items shown in Table 4-1.
Table 4-1
Maintenance Items
Name
Frequency of
implementation
Cleaning
Several times a day
Electrode
Before using the
deterioration check
fixture for the first
time after
delivery/After
replacement of
parts
Once a day/Before
fixture
compensation
Replacement of
When deterioration
parts
check result is
unacceptable
Assembly check
After replacement
of parts
*1. For details, see "Acquiring Reference Values" on page 57.
Maintenance of the fixture is important especially to ensure fine or highly accurate
measurement, since deteriorated measurement performance of the fixture has a significant
effect on the measurement results. Depending on the required measurement performance, it
may be necessary to increase the frequency of maintenance and/or adopt more strict criteria
for each maintenance item.
The electrodes and shorting bars are consumable. Of all the fixture components, these parts
are most likely to affect the measurement results. The electrodes tend to deteriorate
gradually since they can easily be smeared with solder transferred from the DUT during
measurements. Because shorting bars are used to determine the zero reference for fixture
52
Contents
Target parts
Cleaning the
Entire fixture
fixture
Acquisition of
Center electrode,
*1
Electrode plate
reference values
Determining the
Center electrode,
deviation from
Electrode plate
*1
reference values
Changing the
Center electrode,
orientation of the
Electrode plate
contact assembly,
Shorting bar
or replacement of
parts
Evaluation of
Center electrode,
absolute Ls and
Electrode plate
Rs values
Shorting bar
Chapter 4
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