BS ISO 516:2019 pdf free
BS ISO 516:2019 pdf free.Camera shutters一Timing一General definition and mechanical shutter measurements
The method described for each type of shutter, based on digital readout, is rapid and easy for routine manufacturing testing and quality control. As a rule, this method is applicable only to cases in which the character of the time-iluminance curve of the shutter has been proved consistent and acceptable by graphic methods such as those described in Annex A.
The light source shall consist of a lamp and a diffuser. Luminance at any point on the surface of the diffuser, measured perpendicular to the surface, shall be more than 95 % of the maximum luminance and the fluctuation of luminance shall not exceed ±5 %. Luminance of the diffuser, measured at any angle to the diffuser up to 60° from the normal, shall not be less than 85 % of the luminance measured perpendicular to the surface.
The frequency response of the combination of detector, cables and recording equipment shall be within ±3 dB from D.C. to 100/to: for example for a total time of 1 ms, the frequency response shall be at least 100 kHz (50 % output power, i.e. 70 % output voltage, with sinusoidal input). This combination shall have a linear sensitivity characteristic between 1 % and 100 % of Eo. The sensitive area of the detector shall be large enough to receive all the light passing through the entrance aperture. (See Figure 4).
Check the effective time by timing the passage of the shutter slit past a parallel entrance slit, using a technique similar to the method for the front shutters. Stop down the taking lens to the extent that the output of the shutter trace at the highest shutter speed setting forms a trapezoid.
After the shutter design has been qualified, and consistency of operation proved by the method given in A.4, measurement in production line work may be carried out by digital methods, provided effective times are measured at three points (the centre and two points of about 45 % of the picture width from the centre) when is to be measured. Some examples are shown in Table 4.BS ISO 516 pdf free download.
