Practical Data Acquisition using a Windows based Power Meter


Posted on Feb 6, 2014

This application note describes the design of a PC-based, 14-bit data acquisition system. It takes a system approach, includes all the necessary building blocks: analog, digital, hardware, and software. It discusses each step, testing systems separately before integrating them, and detailing pitfalls learned along the way. Many articles h


Practical Data Acquisition using a Windows based Power Meter
Click here to download the full size of the above Circuit.

ave been written about the building blocks in a typical data acquisition system, but few address the entire system, from analog input to PC display. To cover all the problems encountered in designing a complete data acquisition system, the engineer might have to amass ten articles. The following application note describes the design of a PC-based, 14-bit data acquisition system. It takes a system approach, includes all the necessary building blocks: analog, digital, hardware, and software. It discusses each step, testing systems separately before integrating them, and detailing pitfalls learned along the way. The need for a power meter is apparent to anyone who has tried measuring the input and output characteristics of a DC-DC converter using conventional instruments. The design allows users to perform load measurements on the device under test without connecting an endless spaghetti-mass of test leads. Figure 1 shows the completed power meter display on a personal computer (PC) monitor. To cater for boost, buck, and linear implementations, the measurement range was chosen as 30V for both input and output. Most quality DC-DC converters operate at 100kHz or higher. The system`s frequency response should therefore be higher than 100kHz, but a slower response is also acceptable because the switching waveforms are reasonably repetitive. The system`s 14-bit resolution was not of prime importance in the design stage, because...




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

Sensitive Electrostatic detector
Audio-controlled lamp
mc2833 fm transmitter circuit design electronic project
A High Power Led Driver For Low Voltage Halogen Replacement
MC33374 high power voltage switching regulator
AVR LC Meter With Frequency Measurement
The Telegraph Time Machine
Amplifier Timer Circuit Schematic
Special power circuits 7905 7805 7812



Top