BS ISO 516:2019 pdf free.Camera shutters – Timing – 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-illuminance 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).To measure the delay time of a M contact of the synchronization mechanism, adjust the time-interval meter to start the measurement with the closing of the synchronization contacts and to stop it when the detector output is at 0,8 Eg. To check the closing time of an X contact, adjust the time-interval meter to start the measurement when the detector output reaches 0,8 E。and to stop it with the closing of the synchronization contacts. The measured value is compared with the time interval BC in Figure 2.BS ISO 516 pdf download.