Flash Duration Circuit
Circuit that I used to measure the flash duration of the microsecond flash. Saturation of the photodiode must be avoided, it helps to bounce the flash off of a closeby white wall.
Don't you just love my handwriting?
A BPX61 photodiode is used which does have the peak sensitivity well into the IR characteristic of silicon detectors. The 50ohm terminator is not required if the scope has a 50-ohm input impedance setting (mine does not). Also important to make sure that your choice of resistor is still primarily resistive at frequency so no wire wound resistors!
Flash Duration Circuit
Circuit that I used to measure the flash duration of the microsecond flash. Saturation of the photodiode must be avoided, it helps to bounce the flash off of a closeby white wall.
Don't you just love my handwriting?
A BPX61 photodiode is used which does have the peak sensitivity well into the IR characteristic of silicon detectors. The 50ohm terminator is not required if the scope has a 50-ohm input impedance setting (mine does not). Also important to make sure that your choice of resistor is still primarily resistive at frequency so no wire wound resistors!