The working principle fo digital readout(DRO)！

DRO is first necessary to continuously change into a discontinuous change in digital (A / D conversion), (if the input signal is digital, directly on the counter) ,, and finally displayed on the LED digital tube.
In fact, most of the DRO that body, a large number of physical quantity by the displacement sensor after transmission is converted into an electrical signal corresponding to the input section, the instrument will process these signals into a conventional voltage signal, so most of the DRO the body is just a voltmeter, except that the input conversion part.
Composition: a DRO should have the A / D conversion, compensation and scale conversion of three parts. Encoder
A / D conversion: convert analog to digital, a dedicated single chip.
Nonlinear compensation: Most of the measured parameters between render and display the value of non-linear relationship, in order to eliminate non-linear error, you must add the nonlinear compensating circuit in the instrument. Commonly used methods are: Analog nonlinear compensation method, compensation method of nonlinear digital to analog conversion, digital non-linear compensation method.
Scale transformation: there is often a proportional relationship between the measured value and the value of the project, the DRO displays should not enter a value, but the actual value of the project, so you want to scale conversion. Display Range General DRO is a full range can be set.

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