This power point explains about Single Channel Data Acquisition System

1. SINGLE CHANNEL AND MULTI
CHANNEL DATA ACQUISITION SYSTEM

2. Single channel data acquisition system
• A Single Channel Data Acquisition System comprises a
signal conditioner and an analogue to digital (A/D)
converter that performs repeating conversions at a specified
free operating rate .,

3. Pre-amplification
when the signal level is
very low compared to the
input requirement, the
input signal is amplified
to bring its level match to
the input requirement.
The pre amplifiers couple
with the active filters to
minimise noise effect and
interfereing high
frequency components

4. • Receive external orders to convert and hold
• Dual slope A/D converters help convert low-frequency data, including
thermocouple data, particularly in the presence of noise.
• It can provide high resolution and fast speed at a low cost.
Analog to Digital Converters

5. Multi channel data acquisition system
• Multi-channel data acquisition system involves collecting
signals that measure real-world physical circumstances and
transforming the generated samples into digital numeric values
that control a computer.
• Multichannel Analog Multiplexed System is one type of
multiplexed system. It makes use of a multiplexer (mux) to
utilise the time. The previous data stored in the sample and
hold circuit gets converted into digital form

7. • The individual analog signals are applied directly or after
amplification and/or signal conditioning, whenever necessary, to the
multiplexer.
• For the most efficient utilisation of time, the multiplexer is made to
seek the next channel to be converted while the previous data stored
in the sample/hold is converted to digital form.
• When the conversion is complete, the status line from the converter
causes the sample/hold to return to the sample mode and acquires the
signal of the next channel.
• On completion of acquisition, either immediately or upon command,
the S/H is switched to the hold mode, a conversion begins again and
the multiplexer selects the next channel.

8. THANK YOU