Abstract: Provided is a multi-range field full-automatic pressure and electric signal calibrating instrument, comprising: control components such as a shell, a power switch, multiple-interfaces, a display, a keyboard, and a gas pressure generating unit, a power supply unit, a pressure detecting unit, a gas pressure control unit and an electric signal detecting unit; the pressure output end of the pressure control unit is in parallel connection with pressure joints which are used for installing multiple pressure standard meters and detected meters with different ranges; the pressure control unit is in signal connection with the pressure standard meters; the electric signal detecting unit is in signal connection with the pressure control unit and the detected meters; the power supply unit can supply power by batteries.

Abstract: The present invention relates to a turn-back coaxial gas pressurizing pump and gas pressurizing method use the same, belonging to the field of gas pressure creation. The turn-back coaxial gas pressurizing pump comprises a primary cylinder, a primary piston, a secondary cylinder serving as a link of the primary piston, a pressure bar, an air pump bonnet, a secondary piston and a piston rod, wherein the primary cylinder, the secondary cylinder and the piston rod are arranged coaxially, and a rear end of the piston rod extends through a first non-returning adaptive valve installed in the primary piston and is fixed on the bottom wall of the primary cylinder, so that the two pistons move in opposite directions to boost the pressure.

Abstract: A multi-range on-site full-automatic pressure and electric signal calibration instrument includes a housing, a power switch, a plurality of interfaces, a display, a keyboard, a gas pressure generation unit, a power supply unit, a pressure detection unit, a gas pressure control unit and an electric signal detection unit. A pressure output port of the pressure control unit is in parallel connection with pressure connectors used for installation of a plurality of pressure standard devices with different ranges and a calibrated gauge. The pressure control unit is in signal connection with the pressure standard device. The electric signal detection unit is in signal connection with the pressure control unit and the calibrated gauge; and the power supply unit can supply power by batteries. The calibration instrument does not need to be externally connected with a gas cylinder or an alternating current power supply.