GB2278975A - Test apparatus - Google Patents

Test apparatus Download PDF

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Publication number
GB2278975A
GB2278975A GB9312162A GB9312162A GB2278975A GB 2278975 A GB2278975 A GB 2278975A GB 9312162 A GB9312162 A GB 9312162A GB 9312162 A GB9312162 A GB 9312162A GB 2278975 A GB2278975 A GB 2278975A
Authority
GB
United Kingdom
Prior art keywords
probe head
test apparatus
vibration
monitoring
vibrating
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB9312162A
Other versions
GB9312162D0 (en
Inventor
John Woodrow Shere
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BAE Systems PLC
Original Assignee
British Aerospace PLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by British Aerospace PLC filed Critical British Aerospace PLC
Priority to GB9312162A priority Critical patent/GB2278975A/en
Publication of GB9312162D0 publication Critical patent/GB9312162D0/en
Priority to DE1994616728 priority patent/DE69416728T2/en
Priority to EP19940304098 priority patent/EP0629869B1/en
Publication of GB2278975A publication Critical patent/GB2278975A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R29/00—Monitoring arrangements; Testing arrangements
    • H04R29/001—Monitoring arrangements; Testing arrangements for loudspeakers

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  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Testing Electric Properties And Detecting Electric Faults (AREA)

Description

TEST APPARATUS 1 2278975 This invention relates to apparatus suitable for
the testing of electronic components which are mounted on printed circuit boards.
To ensure that an item of electronics equipment is reliable in the field it is standard practice to condition equipment to eliminate early failures. This process is known by a number of terms including:Environmental Stress Screening, In-Process Conditioning, and the related term Burn-In.
These processes involve placing equipment in environmental chambers and subjecting them to repeated cycles of temperature extremes (typical -30oC +50oC) plus vibration over a total period of 4 to 40 hours typical. Units are stimulated by external equipment such as a vibrating platform, for example, and critical signals are monitored by computer to record any failures. All equipment that survives such tests can be statistically proven to be more reliable.
With a large throughput of such equipment there are bound to be failures that require diagnosis. If something 'Breaks' or shows the same problem at ambient/no vibration this is not too difficult to resolve. If it sometimes only fails at a temperature extreme or with vibration applied this is a difficult problem to diagnose. There are a number of items which can be used to aid Thermal problems e.g. Heat Guns, Freezer Sprays.
This invention aims to provide a controlled, portable, local source of vibration. Hence this invention consists of test apparatus comprising a probe body, a probe head, means for vibrating the probe head and means for monitoring the levels of vibration of said probe head. For example, a miniature Accelerometer could be co-located with a Piezo-Electric Transducer or High Power electro-magnetic transducer. Providing a small number of Inter-Changeable Heads would allow the fixture of the probe to Standard Electronic Packages. These would include, Dual in line, T05 and surface mount devices. This would allow typical faults occurring only during vibration to be Reproduced/Diagnosed outside a test chamber.
In the exemplary embodiment shown in the accompanying drawing, a selectable variable frequency oscillator or random frequency source is shown at reference numeral 1. This is supplied to a pre-amplifier 2 Feeding a power amplif ier 3. The power output level is controlled by a feedback loop from an accelerometer 4, integrately mounted with the probe output. It may also be controlled from an external Accelerometer 5. The vibration can be started or stopped from a micro-switch 6 on the probe or a switch mounted on a control unit. The control unit would also contain level controls and digital readouts7 of the frequency applied and displacement.
monitored 1.9 1 Levels or 4

Claims (7)

  1. Test apparatus including a probe body, a probe head, means for vibrating the probe head and means for monitoring the vibration of said probe head.
  2. 2. Test apparatus according to claim 1 in which the means for monitoring the vibration of said probe head comprises an accelerometer.
  3. 3. Test apparatus according to claim 1 or claim 2 in which the means for vibrating the probe head comprises a piezo-electric transducer.
    4. Test apparatus according to claim 1 or claim 2 in which the means for vibrating the probe head comprises an electro-magnetic transducer.
    5. Test apparatus according to any preceding claim in which the means for vibrating the probe head and the means for monitoring vibration thereof form part of a feed-back loop.
    6. Test apparatus substantially as hereinbefore described with reference to the drawing.
    0 Amendments to the claims have been filed as follows Test apparatus including a probe body, a probe head, means for vibrating the probe head and means for monitoring the vibration of said probe head.
    2. Test apparatus according to claim 1 in which the means for monitoring the levels of vibration of the probe head is connected to the probe body.
    Test apparatus according to claim 1 in which the means for monitoring the levels of vibration of the probe head is at a location remote from the probe head.
  4. 4. Test apparatus according to any preceding claim in which the means for monitoring the vibration of said probe head comprises an accelerometer.
  5. 5. Test apparatus according to any preceding claim in which the means for vibrating the probe head comprises a piezo-electric transducer.
  6. 6. Test apparatus according to any of claims 1 to claim 5 in which the means for vibrating the probe head comprises an electro-magnetic transducer.
  7. 7.
    Test apparatus according to any preceding claim in which the means for vibrating the probe head and the means for monitoring vibration thereof form part of a feed-back loop.
    (0 9.
    A method for vibration diagnosis of a structure including the steps of; applying a localised source of vibration of controlled magnitude and frequency to a point on the structure, monitoring the magnitude and frequency of vibration of the structure, and monitoring the function of said structure whilst said vibration is being applied and observing any ensuing failure.
    Test apparatus substantially as hereinbefore described with reference to the drawing.
GB9312162A 1993-06-12 1993-06-12 Test apparatus Withdrawn GB2278975A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB9312162A GB2278975A (en) 1993-06-12 1993-06-12 Test apparatus
DE1994616728 DE69416728T2 (en) 1993-06-12 1994-06-07 Test device
EP19940304098 EP0629869B1 (en) 1993-06-12 1994-06-07 Test apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9312162A GB2278975A (en) 1993-06-12 1993-06-12 Test apparatus

Publications (2)

Publication Number Publication Date
GB9312162D0 GB9312162D0 (en) 1993-07-28
GB2278975A true GB2278975A (en) 1994-12-14

Family

ID=10737076

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9312162A Withdrawn GB2278975A (en) 1993-06-12 1993-06-12 Test apparatus

Country Status (3)

Country Link
EP (1) EP0629869B1 (en)
DE (1) DE69416728T2 (en)
GB (1) GB2278975A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2312972B (en) * 1996-05-11 2000-02-09 Marconi Gec Ltd Vibration control

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1082874A (en) * 1965-02-22 1967-09-13 M E L Equipment Co Ltd Processes wherein a mound of liquid is raised by acoustic vibrations
GB1132125A (en) * 1965-06-10 1968-10-30 Vuma Vyskumny Ustav Machanizac Improvements in or relating to ultrasonic transducers
GB1384421A (en) * 1971-02-26 1975-02-19 Ultrasonic Systems Ultrasonic kits and apparatus
US3889166A (en) * 1974-01-15 1975-06-10 Quintron Inc Automatic frequency control for a sandwich transducer using voltage feedback
EP0272084A2 (en) * 1986-12-15 1988-06-22 Baxter Diagnostics Inc. Ultrasonic horn driving apparatus and method with active frequency tracking
GB2260875A (en) * 1991-10-23 1993-04-28 Anthony Best Dynamics Ltd Feedback controlled noise source for acoustic testing

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2632482B1 (en) * 1988-06-03 1990-08-03 Thomson Csf SYSTEM FOR DETECTION OF FREE PARTICLES IN A COMPONENT PACKAGE AND DETECTION METHOD

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1082874A (en) * 1965-02-22 1967-09-13 M E L Equipment Co Ltd Processes wherein a mound of liquid is raised by acoustic vibrations
GB1132125A (en) * 1965-06-10 1968-10-30 Vuma Vyskumny Ustav Machanizac Improvements in or relating to ultrasonic transducers
GB1384421A (en) * 1971-02-26 1975-02-19 Ultrasonic Systems Ultrasonic kits and apparatus
US3889166A (en) * 1974-01-15 1975-06-10 Quintron Inc Automatic frequency control for a sandwich transducer using voltage feedback
EP0272084A2 (en) * 1986-12-15 1988-06-22 Baxter Diagnostics Inc. Ultrasonic horn driving apparatus and method with active frequency tracking
GB2260875A (en) * 1991-10-23 1993-04-28 Anthony Best Dynamics Ltd Feedback controlled noise source for acoustic testing

Also Published As

Publication number Publication date
EP0629869B1 (en) 1999-03-03
GB9312162D0 (en) 1993-07-28
DE69416728T2 (en) 1999-07-01
EP0629869A1 (en) 1994-12-21
DE69416728D1 (en) 1999-04-08

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)