Multimeter having an erroneous input prevention mechanism
AssigneeSeiko Epson Corporation
InventorManabu Kamiya
Life of this patent
Estimating the term…
Abstract
A multimeter is provided having an erroneous input prevention mechanism that allows more than one mode to be assigned to an input terminal hole located in a central section of a shutter board based on movement of a rotary switch. When the rotary switch is rotated, the first and the second drive-side protrusions formed at separate locations from the selector push away the first or second slave-side protrusions in the slave shell to rotate the shutter board about the center at the negative common terminal hole. Thus, only a specific terminal hole is in the open state. Even when the rotary switch is rotated to a predetermined position, the shutter board does not rotate to leaving the first input terminal hole in the open state.
Claims20
A multimeter having an erroneous input prevention mechanism comprising:
- a rotary switch to select measuring functions,
- a common terminal hole that receives a test lead pin plug,
- a plurality of selection holes separate from the common terminal holes,
- a shutter board that rotates based on operation of the rotary switch to maintain the common terminal hole in an open state and open one of the selection holes while interrupting the other selection holes, and
- a shutter board driving mechanism that rotates the shutter board by transmitting rotational motion from the rotary switch to the shutter board, the shutter board driving mechanism including at least two connection positions within a range of rotation of the rotary switch to mechanically connect the shutter board and the rotary switch and thereby cause the shutter board to rotate based on rotation for the rotary switch, the shutter board driving mechanism further including interrupting positions between the connection positions to interrupt the mechanical connection of the shutter board and rotary switch and prevent movement of the shutter board regardless of the rotation of the rotary switch.
A multimeter having an erroneous input prevention mechanism comprising:
- a rotary switch to select measuring functions,
- a common terminal hole to receive a test lead pin plug,
- a plurality of selection holes separate from the common terminal holes,
- a shutter board that rotates based on rotation operation of the rotary switch, the shutter board maintaining the common terminal hole in an open state and further opening one of the selection terminal holes while interrupting other ones of the selection holes, and
- a shutter board driving mechanism to drive the rotation of the shutter board by transmitting rotational motion of the rotary switch to the shutter board, the shutter board rotating about an axis at a position of the common terminal hole.
A multimeter having an erroneous input prevention mechanism comprising:
- a rotary switch that selects among different functions;
- a common terminal hole that receives a test lead pin plug;
- a plurality of selection terminal holes that receive another test lead pin plug;
- a shutter board having a first hole corresponding to the common terminal hole and a second hole between first and second edges, the shutter board rotating about the common terminal hole to maintain the common terminal hole in an open state and selectively opening one of the selection terminal holes into an open state while causing other selection terminal holes to be in an interruption state;
- and
- shutter board driving means for rotating the shutter board based on movement of the rotary switch.
Dependencies are inferred from the claim text.