- #1
Converting ADC for DC Output: Homework Statement and Solution
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Discussion Overview
The discussion revolves around the conversion of an analog-to-digital converter (ADC) for a direct current (DC) output voltage (Vo). Participants explore the nature of DC signals, the role of multimeters in measuring voltage, and the characteristics of analog signals.
Discussion Character
- Homework-related
- Debate/contested
- Conceptual clarification
Main Points Raised
- Some participants assert that Vo is a DC signal and question why it is not considered an analog signal.
- Others argue that a fixed value on a multimeter in DC mode does not imply the absence of an analog signal.
- There is a suggestion that Vo can change slowly, indicating that it may have characteristics of an analog signal.
- One participant claims that their multimeter does not contain an ADC, while another suggests that it does use an ADC to measure voltage.
- Participants discuss the definition of an analog signal, with one noting that it includes signals that do not change over time.
Areas of Agreement / Disagreement
Participants express differing views on whether a fixed DC voltage can be classified as an analog signal. There is no consensus on the role of the ADC in multimeters, leading to ongoing debate.
Contextual Notes
Some statements rely on assumptions about the definitions of analog signals and the functionality of multimeters, which may not be universally accepted or understood.
- #2
lewando
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Say Vo is at 2 VDC. Why do you think this is not an analog signal?
- #3
berkeman
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It looks like that Vo can change slowly as the Wheatstone Bridge output signal changes. Can you describe what is going on in each stage of this circuit? And estimate the signal out of each stage's output?Minh Thanh said:
- #4
Minh Thanh
Because my multimeter shown a fixed value when it's mode is DC meter.lewando said:
- #5
CWatters
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What were you expecting the meter to show?
- #6
berkeman
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Your multimeter uses an ADC to figure out the measured voltage, BTW. Did you know that?Minh Thanh said:
- #7
Minh Thanh
No .. I mean is that my multimeter reads a value of voltage from output of Vo and I guess that is DC voltage . :D :D The multimeter has no an ADC in itself.berkeman said:Your multimeter uses an ADC to figure out the measured voltage, BTW. Did you know that?
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berkeman
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- #9
lewando
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If your multimeter looks like this:
then
then
would be a true statement.Minh Thanh said:
- #10
Minh Thanh
That is right . I am using it .lewando said:
- #11
lewando
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Why do you think a fixed value is not an analog value? If you think an analog signal needs to be a time-varying signal in order to be converted by an ADC, then that is not a complete understanding. The definition of an analog signal includes signals that do not appear to change over time. For example: the signal that represents the mass of something when placed on an electronic scale is an analog signal.Minh Thanh said:
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