Abstract
M. Tech. (Electrical & Electronic Engineering)
In this research we compare conventional data acquisition system (DAS) with the
embedded data acquisition systems. The performance specifications of 4 different types
of DAQ cards are drawn up with special emphasis made on the following parameters:
Slew rate, settling time, relative accuracy and system noise. These parameters are taken
from 2 conventional DAS and then compared to those taken from 2 embedded data
acquisition systems under the same electrical conditions. The embedded DAQ system’s
hardware was built using the PIC Microcontroller interfaced to the Digital to Analog
Convertors (DAC). MPLAB C18 is used to create a program which communicates with
the embedded DAQ system, to transmit generated signals. National Instrument's
LabView is used to create a program which communicates with the conventional DAQ
system, to acquire external generated signals and retransmit the signals. In most cases the performance of conventional and embedded are close, but one of the embedded DAS
seem to be unstable at high frequencies.