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What is the need of hold device in DDC
Answers (1)
The computer output of DAC is a train of pulses. If this is a control signal, the process will be driven by pulses. This is not acceptable driving the valve at certain opening when pulse is present and closing the valve in between the pulses. To overcome this problem Sample hold device is used which holds the signals from DAC. The most common type is the Zero Order hold (ZOH), where each pulse is held until the next pulse comes along.
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