Abstract: A programmable channel emulator is disclosed which exercises a control unit to which it is attached to detect timing problems or error conditions in the control unit. A plurality of channel emulators can be concurrently operated in order to exercise the control unit in a multiple channel environment. The operation of the plurality of channel emulators is synchronized and controlled by a shared processor in order to emulate possible multiple channel situations that the channel control unit could encounter. Included in this system is a programmable delay circuit that operates under software control to provide a precisely controlled delay between receipt and transmission of signals between each emulator and a connected channel.

Abstract: Apparatus for correcting the mismatch which occurs in condition responsive detector pairs in a detector array so that the outputs of the detectors in the pairs are substantially the same when they are subjected to substantially the same condition.

Abstract: An external light integrating circuitry connectable over two-wires to a flash control circuitry, for causing automatic disabling of an internal light integrating circuitry connected within the control circuitry. The external integrating circuitry receives power over the two wires and transmits light integrating information back to flash termination circuitry within the control circuitry. Camera shutter contacts are connectable with the external integrating circuitry for transmitting a flash initiating signal via the two wires for initiating the photographic flash.

Abstract: A control/calculator device for an associated camera photoflash system, wherein a plurality of photographic variables are manually entered into the device for responsively controlling automatic flash termination and visual display of photographic information including calculated distance information.

Abstract: An improved trigger circuit for triggering an electronic flash apparatus and for energizing a remote sensor is disclosed.

Abstract: Electronic flash apparatus includes a flash storage capacitor, a flash tube for selectively discharging the flash storage capacitor to produce light flashes, and terminating means for terminating the light flash. Separate charging means supplies charging current to the flash storage capacitor. Control means causes the charging means to supply the charging current to the flash storage capacitor each time the terminating means terminates a light flash.

Abstract: An electronic flash apparatus terminates the light flash when light received from the subject has reached a predetermined level. The light terminating means includes a terminating capacitor which is discharged during the termination of the flash. Annunciator control signal generating means senses when the terminating capacitor is being recharged, and produces an annunciator control signal. An annunciator receives the annunciator control signal and provides an indication that the light terminating means has terminated the flash.

Abstract: False triggering of the flash termination switch in a series termination electronic flash unit as a result of contact bounce is eliminated. Gating means inhibits the contacts from triggering the flash termination switch unless a voltage at a selected point in the circuit has attained a predetermined value. False triggering of the flash ignition as a result of noise present on the synchronization switch line is also inhibited.