DRO
DRO Category:
Divided by the signal in the form: ammeter, voltmeter, frequency meter ... ...
Was measured by the number of: single table, multi table
By function: simple display, alarm, showing transmission, showing that communication, showing record sheet, multi-function table, so as to meet different user requirements.
DRO principle:
Continuous digital display is first necessary to convert the analog changes intermittent changes in digital (A / D conversion), then on the counter (if the input signal is digital, directly on the counter), registers, decoders, and finally on the LED digital tube display.
In fact, the digital voltmeter are mostly based on the table as the main body, a large number of physical quantities by the sensor transmitter and converted into corresponding electrical signals, the instrument input signal processing part of these voltage signals into conventional, most digital The main table is only a voltmeter, the difference is input into the part.
Digital display consists of:
A digital display should have the A / D conversion, nonlinear compensation and scale conversion of three parts.
A / D conversion: the analog into digital, there are special single chip.
Nonlinear Compensation: Most measured parameters and nonlinear relationship between the displayed value, in order to eliminate nonlinear error, the instrument must be added to non-linear compensation circuit. Commonly used methods are: non-linear analog compensation method, compensation method of nonlinear digital-analog conversion, digital non-linear compensation law.
Scale transformation: the value of the measured value and engineering often exist between a certain ratio between the number it displays the input values should not be, but the actual value of the project, so the scale transformation. DRO shows the general range of the whole range can be set.
