EP0629869B1 - Appareil de test - Google Patents
Appareil de test Download PDFInfo
- Publication number
- EP0629869B1 EP0629869B1 EP19940304098 EP94304098A EP0629869B1 EP 0629869 B1 EP0629869 B1 EP 0629869B1 EP 19940304098 EP19940304098 EP 19940304098 EP 94304098 A EP94304098 A EP 94304098A EP 0629869 B1 EP0629869 B1 EP 0629869B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- probe
- probe head
- vibration
- test apparatus
- monitoring
- 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.)
- Expired - Lifetime
Links
Images
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
Definitions
- This invention relates to apparatus and methods suitable for the testing of electronic components which are mounted on printed circuit boards.
- WO-A-89/12379 describes a system for detecting free particles in component housings assembled on a printed circuit board.
- the board is secured to a vibrating table and a piezoelectric sensor, placed on individual integrated circuit packages listens for sound impacts generated by free particles trapped within. Vibration levels of the table can be monitored and controlled by means of an accelerometer mounted thereon.
- the system described therein fails to provide a means for applying vibration locally to an integrated circuit package and also fails to provide a means for measuring the local vibration levels that the package sustains during a test procedure.
- this invention aims to provide a method and apparatus for diagnosis of vibration related failures. Furthermore the invention aims to provide a controlled, portable, local source of vibration.
- this invention consists of an apparatus for testing the performance of electronic components under vibratory conditions, the apparatus including a probe body having a probe head for coupling to an electronic component, means for monitoring vibratory levels and charaterised in that the probe body includes means for vibrating the probe head thereby applying a local source of vibration to the electronic component, at a discrete point on its structure.
- the means for vibrating the probe head could comprise a high-power electro-magnetic transducer.
- the means for monitoring vibrations could comprise a miniature piezo-electric accelerometer which could be fixed to the probe body. Velocity, force or displacement transducers may be preferred alternatives for some applications.
- the vibration monitor could be incorporated in a feedback loop for controlling the operating of the vibration source.
- a "roving" sensor moveable to various locations around a printed circuit board could be used to monitor the actual vibration levels of the board and its components. Again, this roving sensor could be used in a feedback loop to control the vibration source.
- the sensor could be an accelerometer or velocity or displacement transducer as appropriate.
- the output from either fixed or roving accelerometer could be integrated electronically to provide velocity and displacement levels.
- the probe body and probe head could be incorporated into a pistol-grip, hand-held device, for example, which would allow the direct excitation of standard electronic packages such as Dual in line, TO5 and surface mount devices. This would allow typical faults occurring only during vibration to be reproduced or diagnosed outside the conventional test chamber.
- a probe 1 receives an electrical signal generated by either a sinusoidal frequency source 2 or a noise source 3 (of variable bandwidth). The signal reaching the probe 1 is controlled by an on/off switch 4 and an amplifier 5 of variable gain.
- the probe 1 incorporates an electro-magnetic vibrator 6 and a first miniature piezoelectric accelerometer 7 and is shown in greater detail in Figure 2.
- the probe 1 comprises an outer casing 8 which houses a magnet 9 and a moving coil assembly 10.
- the moving coil assembly 10 is attached to a vibration plate 11 on which is mounted a dome-shaped probe head 12 made of plastics and the miniature piezoelectric accelerometer 7.
- the output from the first accelerometer 7 is fed to a charge amplifier 13 whose output is connected to a voltmeter 14 and, if desired, to a spectrum analyser (not shown). An output from the voltmeter 14 is used by a comparator circuit 15 to control the gain of the amplifier 5.
- a second miniature piezoelectric accelerometer 16 (remote from the probe 1) has its output connected to a second charge amplifier 17. The output of this amplifier 17 is connected to a second voltmeter 18 and if desired to a spectrum analyser (not shown).
- the level of vibration applied to the probe 1, its frequency and its duration are all recorded by a recorder 19 which receives inputs from a timer circuit 20 (connected to the on/off switch 4), a frequency monitor 21 (associated with the sources 3 and 4) and the voltmeter 14.
- the probe head 12 is held either by hand or by a clamping arrangement in contact with an integrated circuit which is mounted on the printed circuit board under test.
- the excitation frequency desired is set using the appropriate controls provided on the sources 2 and 3.
- the second "roving" accelerometer is fixed to a point of interest on the board with a thin layer of beeswax. Closing of the switch 4 will than activate the electro-magnetic vibrator 6, the vibrations of the vibration plate 11 being coupled to the integrated circuit via the probe head 12.
- the vibrations of the plate 11 are constantly monitored by the first accelerometer 7 which produces a charge proportional to the acceleration applied thereto.
- the accelerometer's output is conditioned by the charge amplifier which produces a measurable voltage at its output.
- the rms. level of this voltage, proportional to the acceleration detected by the accelerometer 7 is measured by the voltmeter which can be provided with means for converting the voltage value to units of acceleration. This latter information can be displayed to the operator and is also fed to the recorder 19.
- An output from the voltmeter 14 is used, in a feedback loop, to control the gain of the amplifier 5 and therefore the vibration level of the probe head 12. If the measured acceleration rises above a pre-set level, for example, then the comparator circuit 15 reduces the gain of the amplifier 5 accordingly. In this way, the probe head 12 and thus the component under test can be protected from overload.
- Typical frequencies and acceleration levels applied range from 10Hz to 2kHz and 2g(rms) to 5g (rms) respectively.
- the acceleration level, frequency and length of time for which excitation persists are continually recorded by the recorder 19 using the inputs from the timed circuit 20, frequency monitor 21 and voltmeter 14.
- the roving, second accelerometer detects acceleration at the pre-chosen point of interest.
- a 'g' level can be displayed by the second voltmeter 18.
- the above operations can be repeated at different locations around the board under test until its design criteria have been reached or it fails electrically.
- the amount of vibration to which the board has been subjected can be ascertained by interrogating the recorder 19. Thus the operator can ensure that the board has not exceeded its design requirements and is therefore fit for sale if no electrical faults have been found during testing.
- the recorder 19 also tells the operator the conditions under which any failure occurred. When an electrical failure does occur, then the diagnostic equipment is removed and further solely electrical tests are carried out on each integrated circuit or each printed track if necessary, to find out which component or soldered joint, for example has actually failed.
- Figure 1 could also be used for modal analysis of board vibrations by examining the output of the roving accelerometer with a spectrum analyser and applying an impulse to the board through the probe head.
Landscapes
- 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)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Claims (6)
- Dispositif destiné à tester les performances de composants électroniques dans des conditions de vibration, le dispositif comprenant un corps de sonde (1) comportant une tête de sonde (12) en vue du couplage avec un composant électronique, un moyen (7, 16) destiné à surveiller les niveaux vibratoires et caractérisé en ce que le corps de la sonde (1) comprend un moyen (6) destiné à faire vibrer la tête de la sonde (12) en appliquant ainsi une source de vibration locale au composant électronique, en un point discret sur sa structure.
- Dispositif de test selon la revendication 1, dans lequel le moyen (7, 16) destiné à surveiller les niveaux vibratoires comprend un capteur (7) relié au corps de la sonde (1).
- Dispositif de test selon la revendication 1, dans lequel le moyen (7, 16) destiné à surveiller les niveaux vibratoires comprend un capteur (16) à distance de la tête de la sonde (12).
- Dispositif de test selon l'une quelconque des revendications précédentes, dans lequel le moyen (7, 16) destiné à surveiller les niveaux vibratoires comprend un accéléromètre.
- Dispositif de test selon l'une quelconque des revendications précédentes, dans lequel le moyen (6) destiné à faire vibrer la tête de la sonde comprend un transducteur électromagnétique (9, 10, 11).
- Dispositif de test selon l'une quelconque des revendications précédentes, dans lequel le moyen (6) destiné à faire vibrer la tête de la sonde et le moyen (7, 16) destiné à surveiller les niveaux vibratoires font partie d'une boucle de contre-réaction.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9312162 | 1993-06-12 | ||
GB9312162A GB2278975A (en) | 1993-06-12 | 1993-06-12 | Test apparatus |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0629869A1 EP0629869A1 (fr) | 1994-12-21 |
EP0629869B1 true EP0629869B1 (fr) | 1999-03-03 |
Family
ID=10737076
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19940304098 Expired - Lifetime EP0629869B1 (fr) | 1993-06-12 | 1994-06-07 | Appareil de test |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0629869B1 (fr) |
DE (1) | DE69416728T2 (fr) |
GB (1) | GB2278975A (fr) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2312972B (en) * | 1996-05-11 | 2000-02-09 | Marconi Gec Ltd | Vibration control |
Family Cites Families (7)
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 |
CH446783A (de) * | 1965-06-10 | 1967-11-15 | Vyzk Ustav Mech | Ultraschallgenerator mit einem Ultraschall-Resonanz-Schwingungssystem |
US3924335A (en) * | 1971-02-26 | 1975-12-09 | Ultrasonic Systems | Ultrasonic dental and other instrument means and methods |
US3889166A (en) * | 1974-01-15 | 1975-06-10 | Quintron Inc | Automatic frequency control for a sandwich transducer using voltage feedback |
US4687962A (en) * | 1986-12-15 | 1987-08-18 | Baxter Travenol Laboratories, Inc. | Ultrasonic horn driving apparatus and method with active frequency tracking |
FR2632482B1 (fr) * | 1988-06-03 | 1990-08-03 | Thomson Csf | Systeme de detection de particules libres dans un boitier de composant et procede de detection |
GB2260875B (en) * | 1991-10-23 | 1995-06-28 | Anthony Best Dynamics Ltd | Noise source |
-
1993
- 1993-06-12 GB GB9312162A patent/GB2278975A/en not_active Withdrawn
-
1994
- 1994-06-07 DE DE1994616728 patent/DE69416728T2/de not_active Expired - Fee Related
- 1994-06-07 EP EP19940304098 patent/EP0629869B1/fr not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
DE69416728D1 (de) | 1999-04-08 |
GB9312162D0 (en) | 1993-07-28 |
DE69416728T2 (de) | 1999-07-01 |
GB2278975A (en) | 1994-12-14 |
EP0629869A1 (fr) | 1994-12-21 |
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