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Содержание 4912

Страница 1: ...rs or strobe lamp repetition rate in hertz or r min The flash rate may be syn chronized externally or driven from an inter nal generator whose frequency range is 5 to 125 Hz 300 to 7500 r min Recharge able batteries contained in the handle give a minimum of 2 5 hours operation from one charge The xenon lamp provides a con centrated beam of white light whose bright ness is independent of frequency ...

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Страница 3: ...PORTABLE STROBOSCOPE TYPE 4912 From serial number 879442 October 1980 ...

Страница 4: ...Operation while Charging 7 Accelerated Charging 7 External Power 7 3 3 FREE RUNNING STROBOSCOPE OPERATION 7 3 4 OPERATION FROM AN EXTERNAL TRIGGER 11 Triggering from another Instrument 11 Triggering from Photoelectric Probe MM 0012 11 Triggering from Magnetic Transducer MM 0002 13 Single Flash Triggering 14 3 5 PHOTOGRAPHY WITH THE 4912 14 4 SERVICE AND REPAIR 16 ...

Страница 5: ...lerated charge rechargeable NiCd batteries Mains or external DC operation when required unaided eye to perceive When the machinery is illuminated by the flashing light from the xenon lamp in the Stroboscope and the flash rate is suitably adjusted the illusion obtained is of stationary or slowly moving machinery This illusion makes it very easy to assess qualita tively how the machinery is behav in...

Страница 6: ...d to shield can be used to power Photoelectric Probe MM 0012 Power Input Connector type standard 7 pin DIN socket accepting plug JP 0703 Charging 6 to 15 V DC 0 to 600 mA 7 hours at max rate or from battery charger ZG 0113 10 hours External power 6 to 15 V DC max 7 W to 15 W respectively with strobo Fig 4 Battery Charger ZG 0113 In this operating mode the exter nal trigger will lock to triggering ...

Страница 7: ...l indicator of the battery condition Also indicates whether voltage is sufficient when external power is used The pointer leans to the left when the instrument is switched off or the battery or external voltage insufficient to power the 491 2 within specification The poin ter leans to the right when the voltage is sufficient If the indicator 3 ...

Страница 8: ...ay range 10 to 90000 r min r min Display range 1 to 9000 r min Hz Display range 1 to 1500 Hz Hz Display range 0 1 to 150 0 Hz Four position switch Power Off Power is removed from the 491 2 The FREQUENCY dis play may continue to indicate for a few seconds after power is switched off Tacho The 491 2 behaves solely as a tachometer displaying the fre quency of the EXT TRIG INPUT signal The lamp does n...

Страница 9: ...nserted the 4912 can be powered only from an external source unless the plug has been modified as described in section 3 2 6 V to 15 V 6 V to 12 V ill DC max 6 W to DC 0 to 600 mA _ _ ___ t 1 to charge the batteries ov power the instrument externally 790542 Fig 2 2 POWER INPUT connections external view Single turn level setting control for adjusting the voltage at which the EXT TRIG INPUT operates...

Страница 10: ...at ing that the battery voltage falls to below the usable level after a shorter operating time than when the Stroboscope was new The battery can undergo approximately a thou sand charge discharge cycles before its performance deteriorates however Replace ment is a service operation Note that the true battery condition is indicated by the BAT TERY LEVEL indicator only when the charging source is sw...

Страница 11: ...h stroboscope operation The 491 2 is protected against accidental reverse connection of the external power source Type 2808 Power Supply available separately may be used to operate the 491 2 while at the same time recharging the batteries from exhaustion in about 1O hours to full charge To do this connect the Type 2808 to a suitable mains supply as described in its instruction manual connect its O...

Страница 12: ...ject which is rotationally symmetrical such as a fan or gear wheel In such cases it is helpful to stop the machine and make a distinctive mark with chalk or ink on the rotat ing part Start the machine again and obtain a stationary imagine Check that the mark occurs at only one point in its orbit and if it occurs at several reduce the Stroboscope frequency If exclusion of ambient light proves to be...

Страница 13: ...e or more times the flash frequency To find out whether this is so and if it is determine the true motion frequency proceed as follows 1 Record the highest flash frequency in Hz at which a single stationary image is ob tained 2 Continue turning the INTERNAL GENERATOR wheel anti clockwise reducing the fre quency until another single stationary imagine is obtained if none is obtained when the flash ...

Страница 14: ... 000 300 18 000 70 19 000 20000 75 400 80 500 85 90 600 700 95 800 100 1 0k 105 110 2 0k 115 120 125 800459 Nomogram for determining motion frequencies higher than 125Hz with free running strobo scope operation where f m true motion frequency f h 1 second highest flash frequency fh highest flash frequency When FUNCTION SELECTOR is set to Power Off the indication on the FREQUENCY DISPLAY may linger...

Страница 15: ...derations concerning external triggering by other instruments and photo electric and magnetic probes are dealt with in the following sections 3 4 1 Triggering from another Instrument The 491 2 may be triggered from the AC recorder output from a measuring instrument such as the B K Portable Vibration Meter Type 2511 for use in dynamic balancing for example It may be triggered from an excitation sou...

Страница 16: ...770521 Fig 3 3 Dimensions of Photoelectric Tachometer Probe MM 0012 Fig 3 4 MM 0012 Photoelectric Tachometer Probe in use Fig 3 5 MM 0012 Photoelectric Tachometer Probe in use 12 ...

Страница 17: ...gements in Figs 3 4 and 3 5 3 4 3 Triggering from Magnetic Transducer MM 0002 The Magnetic Transducer MM 0002 Fig 2 Chapter 1 is a variable reluctance device with a built in permanent magnet Changes in the reluctance of its magnetic circuit part of which is external to the Transducer cause a voltage at its terminals This voltage can be made sufficient to trigger the 491 2 If the moving object to b...

Страница 18: ...anual If in doubt use a setting of 1 30 s or longer Photography with the 4912 is discussed in section 3 5 3 5 PHOTOGRAPHY WITH THE 4912 14 The recommended exposures for photographing objects illuminated by the flash of the 4912 are given in Table 3 2 The conditions in which they will be found optimum are subject to lamp distance 250 mm 10 in subject elements illuminated up to 2 5 off axis The 491 ...

Страница 19: ...rate less than 25 Hz Exposure time in seconds 1 30 1 15 1 8 1 4 Flash rate greater than 25 Hz Aperture settings for Kodak Tri X f 4 f 5 6 f 8 f 11 Aperture settings for Kodak Plus X f 5 6 f 8 f 11 f 16 800157 Table 3 2 Recommended exposures for photography with the 4912 If the purpose of using the 491 2 for photography is to obtain a clear picture of a moving object it is important to ensure that ...

Страница 20: ...ccur which impairs its correct function then all power should be disconnected to prevent the risk of further damage For repair consult the se parate Service Instruction provided or consult your local B K service representative Un der no circumstances should repair be attempted by persons not qualified in the service of electronic instrumentation ...

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Страница 24: ... o In 1 Cl o I LI _I o r _ 0 0 _ Briiel Kjaer DK 2850 NIERUM DENMARK Telephone 452800500 Telex 37316 brukadk ...

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