UNI-T UTD1000L Series, Руководство пользователя

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Position
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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
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Position
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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,
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Position
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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 DC mode, manually adjust
vertical scale and use the cursor to work out DC parameters, see figures as below:
Figure 4-24 AC Parameter Measurement Figure 4-25 DC Parameter Measurement
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UTD1000L User Manual