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95 volts aligned Analog Devices approximately Bureau of Standards C-13 filament lamps calibration circuit current measuring shunt current noise current to voltage curves dependence of relative digital voltmeter experiments feedback resistor filament clear bulb flux lamps frosted bulb lamp glass envelope inches input impedance instrumentation intensity versus pitch lamp base lamp orientation lamp power circuitry lamp socket lamp stability laser beam linearity load luminous intensity versus medium bipost minute of arc National Bureau operational amplifier optic axis optical bench OPTICAL RADIATION MEASUREMENTS Orientational dependence photocell photodetector photometry pitch and yaw pivot position potentiometer power supply radiance lamp mount radiometry relative luminous intensity screws selenium sensing leads shown in figure sliding sphere mount suedine support posts supporting plates switch temperature thermocouple total luminous flux type of lamp variation versus pitch dependence voltage bias voltage converter voltage divider voltage noise watt yaw angle zero