out the light effectively enough.(Note:a finger over the input connector will shut out the light effectively enough for the less sensitive Student Photometer.). With the input connector covered,set the sensitivity Range switch to the most sensitive range, and turn the Zero Adjust knob until the meter reads zero.The instrument is now zeroed on all ranges.Now turn the sensitivity Range switch to the highest range. 4Measuring Relative intensities *IMPORTANT:The photometer reading is proportional to the energy of the light that falls on its photovoltaic cell,which is in turn proportional to the intensity of the incident light and to the area of the cell that is illuminated.Therefore,for accurate and consistent result,the incident light should fall directly onto the Light Probe Input connector or fiber-optic probe,with a zero degree angle of incidence. When using the photometers,intensity measurements are always made relative to some established reference value.If you were measuring the intensity of light after it passes through a polarized,for example,you would first measure the intensity of light for a particular orientation of the polarizer(usually,but not necessarily,the orientation producing a maximum intensity of light). When measuring this reference intensity,you would adjust the photometer sensitivity so that the meter read 10 (full scale).You could then measure the intensity for different orientations of the polarizer.These subsequent measurements would be recorded as a percentage of the original measurement.For example,if the meter read 6.5,you would record the intensive as 65%of the reference value. In general,to use the photometer to measure relative intensities: Arrange the photometer to measure your reference intensity,usually the maximum intensity of light that you expect to measure. Turn the sensitivity Range switch clockwise until the photometer reads off scale. Turn the sensitivity adjust knob counterclockwise until the meter reads exactly 10(full scale). Now-without touching the photometer controls arrange the photometer to measure the other intensities you wish to measure.Read the intensities as a percentage of the original measurement. NOTE:After measuring your reference intensity,you can use the sensitivity Range switch to change the range of the measurement.Just take into account the effect on the reading,as you would for any measuring instrument.For example,if the sensitivity Range switch were set to 100 when the reference source was measured,and then switched to 30,you would use the 0-3 scale and read your value as 0-30%.In a similar manner,if the sensitivity Range switch were turned to the 300 setting,you would use the 0-3 scale,and read your value as 0-300%. ⑤Output Jacks .A pair of output jacks are located on the back panel of the photometer.These jacks provide a voltage that is proportional to the meter reading.The voltage for a full-scale meter reading is 140 mV-10V@I mA,depending on the range selection.The recorder output voltage is independent of the setting of the Variable sensitivity knob. .A miniature phone jack is located on the front panel of the Model OS-9152B Photometer.This will provide approximate 1.5 V at 1 mA for a full-scale meter reading.Important:The recorder output voltage is independent of the setting of the Variable sensitivity knob. 白12 out the light effectively enough. (Note: a finger over the input connector will shut out the light effectively enough for the less sensitive Student Photometer.). ·With the input connector covered, set the sensitivity Range switch to the most sensitive range, and turn the Zero Adjust knob until the meter reads zero. The instrument is now zeroed on all ranges. Now turn the sensitivity Range switch to the highest range. ④Measuring Relative intensities ★IMPORTANT: The photometer reading is proportional to the energy of the light that falls on its photovoltaic cell, which is in turn proportional to the intensity of the incident light and to the area of the cell that is illuminated. Therefore, for accurate and consistent result, the incident light should fall directly onto the Light Probe Input connector or fiber-optic probe, with a zero degree angle of incidence. When using the photometers, intensity measurements are always made relative to some established reference value. If you were measuring the intensity of light after it passes through a polarized, for example, you would first measure the intensity of light for a particular orientation of the polarizer (usually, but not necessarily, the orientation producing a maximum intensity of light). When measuring this reference intensity, you would adjust the photometer sensitivity so that the meter read 10 (full scale). You could then measure the intensity for different orientations of the polarizer. These subsequent measurements would be recorded as a percentage of the original measurement. For example, if the meter read 6.5, you would record the intensive as 65% of the reference value. In general, to use the photometer to measure relative intensities: ·Arrange the photometer to measure your reference intensity, usually the maximum intensity of light that you expect to measure. ·Turn the sensitivity Range switch clockwise until the photometer reads off scale. ·Turn the sensitivity adjust knob counterclockwise until the meter reads exactly 10 (full scale). ·Now-without touching the photometer controls arrange the photometer to measure the other intensities you wish to measure. Read the intensities as a percentage of the original measurement. NOTE: After measuring your reference intensity, you can use the sensitivity Range switch to change the range of the measurement. Just take into account the effect on the reading, as you would for any measuring instrument. For example, if the sensitivity Range switch were set to 100 when the reference source was measured, and then switched to 30, you would use the 0-3 scale and read your value as 0-30%. In a similar manner, if the sensitivity Range switch were turned to the 300 setting, you would use the 0-3 scale, and read your value as 0-300%. ⑤Output Jacks. ·A pair of output jacks are located on the back panel of the photometer. These jacks provide a voltage that is proportional to the meter reading. The voltage for a full-scale meter reading is 140 mV - 10 V @ 1 mA, depending on the range selection. The recorder output voltage is independent of the setting of the Variable sensitivity knob. ·A miniature phone jack is located on the front panel of the Model OS-9152B Photometer. This will provide approximate 1.5 V at 1 mA for a full-scale meter reading. Important: The recorder output voltage is independent of the setting of the Variable sensitivity knob