Question:-
Digital data acquisition system are used
1. Only when the output of the transducers is in digital form
2. When physical process being monitored is slowly varying (narrow bandwidth)
3. When low accuracy can be tolerated
4. When high accuracy and low per channel cost is required
Which of these statements are correct?
Option (A)
1, 2 and 3
Option (B)
1, 3 and 4
Option(C)
1 and 3
Option(D)
1 and 4
Correct Option:
(D)
Question Solution:
. Digital data acquisition systems can be used with analog output as well as digital output of the transducers. Analog data can be converted into digital through A/D converter
. Refer TDM; when telemetering slow changing, low band with data, it would be extremely wasteful if these measurements occupied a full RF communication link. To increase efficiency, the communication link should be used for other measurements during the “data” interval between samples. We see that efficient use of the communication system may be achieved by time-sharing the communication channel among a number of measured parameters
. Further, Digital data acquisition system are highly accurate due to better noise immunity
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