Nordson DAGE USB Connector Testing Application Note.pdf - 第3页
U SB Connection T es ting Applica tion Not e T wo W ays of T esting The Nordson DAGE 4000 Plus pr ovides a flexible testing platform, with Paragon TM Materials Software, but sometimes a specialist or custom jig is needed …
Contact Material Attributes
Tin
Low cost, few mating cycles,
susceptible to fretting corrosion
Hard gold
High resistance to corrosion, low insertion force,
high number of mating cycles
Silver Mainly used for high current contacts
Hard gold flashed
palladium-nickel
Particularly suitable for low signal levels, low wear,
high number of mating cycles
USB Connection Testing
Application Note
Understanding Connectors
There are several methods to test connectors:
σ Insertion Force – the maximum push force required to push the two halves of the connector together
σ Withdrawal Force – the maximum pull force required to pull the connector apart
σ Contact Resistance – the electrical resistance associated with the point of contact, typically around 10-30mΩ
σ Fretting – small rubbing movement between surfaces that are forced together.
σ Fretting Corrosion – oxidation of contacts due to fretting
σ Spring Constant – stiffness of the contact. Stiff contacts create high friction forces which can reduce fretting and
contact resistance but result in higher insertion and withdrawal forces
The optimum test method depends on the materials being used and their attributes.
Test Method
Nordson DAGE have worked with the Manufacturing Technology Centre (MTC) to develop bespoke tooling and test
methodology to characterize connector integrity and degradation through cyclic insertion and withdrawal testing.
The Nordson DAGE USB connector wear jig has a self-aligning function that minimizes the loads in the X and Y direction
while the USB connector is being moved in the Z direction. This jig can also be locked after the initial alignment to simulate
withdrawal processes where the connector is held rigidly.
USB Connection Testing
Application Note
Two Ways of Testing
The Nordson DAGE 4000Plus provides a flexible
testing platform, with Paragon
TM
Materials Software,
but sometimes a specialist or custom jig is needed
to support samples such as USB connectors.
To measure the cyclic performance of a USB
design, the connector must be repeatedly inserted
and withdrawn from the mating connector, while
measuring the force of insertion and withdrawal to
understand its mechanical performance, as well as
measuring its electrical performance, such as pin
resistance, within the same experiment.
The instrument can interface with any 0-10 V
external measuring device, so a resistance meter
can be used to produce a resistance versus time
graph in real-time, during the experiment. Paragon
Materials Software can trigger the data capture
in external devices as well, for multi-channel data
capture devices.
Figure 2: USB self-aligning connector jig.
Figure 4: Paragon Materials software interface showing multiple
test cycles.
Figure 3: X, Y and Z axis control to < 1 micron for connector alignment.
AN-USBT-24072019-V2
www.nordsondage.com
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USB Connection Testing Application Note
Testing is performed to the following standards:
Nordson DAGE, The Partner of Choice for Advanced
Testing
Instead of designing and constructing a bespoke testing frame to carry out this experiment,
the Nordson DAGE micro mechanical tester can be used. It is a simple to use, highly flexible
platform for a wide range of mechanical testing. With different cartridge and software options
available, the experiment can be very quickly and easily altered.
The Manufacturing Technology Centre (MTC)
The MTC develops and proves innovative manufacturing processes and technologies in an
agile, low risk environment, in partnership with industry, academia and other institutions. The
MTC focuses on delivering bespoke manufacturing system solutions for our customers.
The MTC operate some of the most advanced manufacturing equipment in the world, and
employ a team of highly skilled engineers, many of whom are leading experts in their field.
This creates a high-quality environment for the development and demonstration of new
processes and technologies on an industrial scale.
The MTC is part of the High Value Manufacturing Catapult, supported by Innovate UK.
Standard Test
IPC-TM-650 3.4 Durability, connectors
IPC-TM-650 3.18 Mating and unmating force, connectors
EIA-364-09C Durability test procedure for electrical connectors and contacts
MIL-STD-1344A
2012.1 Contact insertion and removal forces
2013.1 Mating and unmating forces
2014 Contact engagement and separation