Abstract: A pneumatic calibration system and the pump therefore, the system comprising a first fluid containing chamber for attachment to a device to be tested, a valve coupled to the first chamber to remove the fluid from the first chamber and a pump structure for providing a predetermined pressure to the fluid in the first chamber. The pump comprises a first piston disposed and moveable within first chamber to vary the volume of first chamber, a second piston, a second fluid containing chamber communicating between the first piston and the second piston, the second piston providing a predetermined pressure to the fluid in the second chamber and an expanding sleeve valve communicating between the first chamber and the second chamber to minimize the pressure differential across the first piston. The position of the first piston is adjustable in the first chamber. The second chamber includes a first portion and a second portion with a sleeve valve disposed therebetween.

Abstract: A universal connector including a housing of molded thermoplastic having a pair of slots in a side thereof for receiving therein plugs or wires of various shapes and sizes for connection with the connector and a slot for receiving therethrough a stud. A pair of copper blocks are positioned adjacent each other with a pair of beryllia washers and a temperature sensor therebetween. One block includes a pair of plain apertures extending entirely through the block. The other block includes a pair of threaded apertures extending entirely through that block. These apertures are aligned with the washers. The blocks also include opposing grooves which, together, form an aperture. A pair of nylon screws are threaded into the threaded apertures to secure the blocks into tight frictional engagement against the washers and the temperature sensor. A copper wire is secured to the block and a copper wire is secured to the block to provide electrical connection between the blocks and an external device.

Abstract: The disclosure relates to a linearizer circuit capable of substantially replicating a non-linear waveform on a piece-wise linear basis by providing a pair of circuits, one capable of reducing the slope of an output circuit curve when a predetermined output level has been reached and the other capable of increasing the slope of an output circuit curve when a different predetermined output level has been reached. Such circuits are cascaded in required order and with predetermined slope parameters to replicate a non-linear curve on a piece-wise linear basis.

Abstract: The disclosure generally relates to a protective device for an electronic instrument wherein input and output lines to and from the instrument are always isolated from calibration input and output terminals. This is accomplished by placing reed switches on or closely adjacent the non-magnetic instrument front panel, the switches being arranged to connect one of the input lines and terminals to the instrument circuitry while disconnecting the others therefrom, this being accomplished under control of a magnet placed adjacent the switches during a calibration procedure. The switches are further arranged to short circuit the output test terminals in the unenergized switch state to prevent insertion of unwanted signal current or voltage in that state.