UNI-T UTD1025DL UTD1000L Series user manual

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30 UTD1000L User Manual

4.25 Autoset for Signals with DC Offset

UTD1000L Series is designed with powerful autoset function that makes it possible to

perform fast and accurate measurement in DC–coupled mode for signals with any DC

component.

Position parameter on upper right display of screen: This parameter stands for position

readout for the channel reference marker that moves from horizontal central line, if it is

positive value, it indicates the channel marker is above the horizontal central line and the

negative one is for the marker below the horizontal central line. To work out the final DC offset,

first move the waveform to the center of the screen, then multiply the Position value by

current amplitude range readout, that is final DC offset result you want.

For example:

Connect UTD1000CL channel with 70mVpp AC sine signal mixed with 1.1V DC offset, set the

channel to DC coupling, then perform AUTO function, the waveform in Figure 4-24A will show

on the screen. On the display, Position readout -53.63div indicates the channel reference

marker moves 53.63div downward from the horizontal central line. The current amplitude

range is 20mV/div, so DC offset readout: 20mV/div×53.63div =1.0726V

Vpp readout: 72mV means the AC peak-to-peak value of the signal

You can also directly read out the DC level through AVG value.

AVG value: 1.0726V, which stands for the signal DC level.

Through all parameters mentioned above, the signal can be understood very easily.

Note: For UTD1000DL models, CH1 and CH2 are both set to DC coupling when inputting the

signal above, then perform the AUTO function, after that, also move the waveform to the

center of the display(See Figure4-24B ), and then calculate DC offset with use of Position

readout and current amplitude range value.

Figure 4-23 UTD1000L Setup for Signals with DC Offset

As for traditional oscilloscope, it needs hard work to complete the task, for it has to set the

coupling to AC mode first to measure out the AC parameters, and then reset the coupling to

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UNI-T UTD1025DL Multimeter/Oscilloscope