ANSWERS

__ (a) Define the term real time data collection. **(2)** __

Real-time data collection means the information that is delivered immediately after the collection.

There is no delay in the timeliness of the information provided.

__(b) Identify one analogue output device and one digital out put device involved in data logging. **(2)**__

**Analogue:** thermometer, voltage logger

**Digital:** sound wave meter, heat meter

__(c) Explain advantages and disadvantages of the real time data collection. **(6)**__

**Advantage:**
 * The information is always up-to date
 * Easier to see the changes in the results

**Disadvantage:**
 * It will not be really suitable for long term data logging
 * Impossible to see the final result - which means people need to wait until the result comes out

__(d) Evaluate the analogue device as compared to digital devices. And discuss how they are suitable or not suitable for the scenario. **(10)**__

**Analogue**
 * Analogue device can be not really accurate
 * Need human workers to record and analysis the data
 * Suitable for short term experiment
 * Anyone is accessible and able to purchase because it is cheaper
 * It is not suitable for scenario because there are a lot of things to measure
 * Taking too much time
 * Human errors

**Digital**
 * It atomically records and analysis the data
 * Machine sometimes can be expensive
 * Needs a lot of equipments (software, hardware and PC to record the data)
 * Less time consuming
 * Too much information (e.g, machine can record the temperature per second... and if it is the long term experiment...)