Fixture Motion Fixture Verifier
Fixture Verifier Description and Operation
Mechanical
The Fixture Motion. Fixture Verifier is a "true" three axis "XYZ" gantry style linear
motion machine . The machines frame is of welded steel box tubing with the rail
surfaces being of 1/4 inch bar stock. The entire frame is heat stress relieved and
the rail surfaces are ground to be linear and perpendicular to the other axes. The
Gantry of the verifier is the "Y" axis. The gantry is made of aluminum, is mostly
a welded assembly and is also heat stress relieved. The "X" and "Z" axes travel
across the top of the gantry from left to right. All axes use DC servo motors, are
of the "closed loop" variety, use a belt drive and cannot get lost or get out of
position due to being bumped or pushed. Both the "X" and "Y" axes use linear encoders
for less then .0002" return accuracy and the "Z" axis uses a rotary encoder with
a .001" return accuracy.
Electronic
The Fixture Motion. Fixture Verifier requires an IBM style computer to operate.
The computer is included with the Verifier. There are no special cards needed to run the machine as all
communications take place through one of the computers serial communications ports.
The verifier uses a USB, RS485 style communications system to communicate with each axis
and to the on board controller used to check the 7,332 probe points. All of our
electronics has been designed in house specifically for our machines using components
readily available throughout the world. Spares for any or all boards are also available
upon request.
FixtureWare™
Software
FixtureWare™ software was created specifically to be used with the Fixture Motion.
Wire Wrap Machine and Automatic Fixture Verifier. All of our software is designed
to operate on an IBM style computer using Microsoft Windows. FixtureWare is able
to directly import ASCII files, Hewlett Packard Wires files, Genrad NAR files, Teradyne
Momentum files and WireProQC Sequence files.
Some of the software functions available include:
1. Skew of the probe plate in relation to the software (for crooked probe
plates).
2. "Manual Probing" Used to check by hand for dirty probes etc. or to probe
loaded boards to test for proper probing of the printed circuit board.
3. Error files can be written to DOS in ASCII, will show node list, what
it should be verses what it is.
Operation
The operator loads the fixture directly onto the verifier if it is a Hewlett Packard
style fixture. If the fixture is of a different manufacturer then an adapter for
that manufacturer must be installed first.
The operator must locate the position of the first and
last probes to test then if the fixture were created using a Fixture Motion Wire
wrap Machine the operator simply clicks on the "Fixture Verifier" tool and selects
"test fixture". Not having used our Wire Wrap Machine necessitates importing a file
for test and creating a FixtureWare ".fix" file and then clicking on the "Fixture
Verifier" tool and selects "test fixture". The Verifier first does a "quick check"
for internal identification jumpers and for shorts, passing this the machine proceeds
to mechanically locate each test probe on the top of the fixture. During each of
these actions it electronically checks all of the 7,332 points on the bottom of
the fixture for continuity and saves this knowledge to memory. Upon completion of
this test, an error file is created. This error file can be used by studying the
text to repair the fixture.
How
it Works
A flying topside probe pulls a socket to GND and scans the interface for connected
interface pins. The software compares these interface pins against the wire list,
looking for shorted nets and missing wires (opens). Each socket and transfer pin
on the probe plate is tested. After sequencing through the probe plate, an interface
point is pulled high and the rest of the interface pins are scanned—again looking
for shorted nets and opens. Every node connected to the interface is tested.
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Mechanical Specifications:
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Dimensions: |
Width is 46.6 inches, Depth is 32.4 inches, Height to the top of the probe housing
is 50 inches. |
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Fixture size: |
Maximum size 35 in. x 20 in. |
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Probe area: |
Maximum size 28 in. x 18 in. |
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Number of probes tested: |
Maximum 7332 testable points. |
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Combined adapter / fixture height: |
Maximum 12 inches |
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Options: |
The Fixture Motion Fixture Verifier is built as a table top unit. A stand is available
to turn it into a table model. Fixture adapters for other test types are available
on a per quote basis. |
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Warranty: |
One Year Parts and Labor (does not include travel or freight)
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Accuracy: |
+/- 0.005" @ 69-73 degrees Fahrenheit |
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Repeatability: |
+/- 0.001" |
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7332 pins read time: |
300 ms |
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Average Test Time per pin: |
3.500 secs. |
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Last modified:
27-Oct-2007
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