By Howard Austerlitz
Data Acquisition ideas utilizing own Computers comprises all of the info required through a technical expert (engineer, scientist, technician) to enforce a PC-based acquisition approach. together with either uncomplicated instructional info in addition to a few complicated subject matters, this paintings is appropriate as a reference booklet for engineers or as a supplemental textual content for engineering scholars. It supplies the reader sufficient realizing of the subjects to enforce an information acquisition method according to advertisement items. A reader can however easy methods to customized construct or write his or her personal software program. that includes various info, this booklet might be precious to either the technical specialist and the hobbyist.
* includes tables of reference info on PC/XT/AT desktops which are often no longer present in a unmarried source
* contains details, similar to I/O addresses, reminiscence maps, and interrupts
* Discusses software program reference fabric together with BIOS and DOS interrupt calls
* offers worthy interface info together with timing diagrams, layout examples, and outlines of ordinary interfaces, reminiscent of the RS-232 serial interface
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Extra resources for Data Acquisition Techniques Using Personal Computers
The reactance of an ideal capacitor is -j/cûC (where ω = 2 π / , C is c a p a c i t a n c e , and j = V - 7 ) . T h e R C low-pass filter is shown in Figure 3-la. Vm is input A C voltage and V o ut is output A C voltage. T h e transfer function that describes the r e s p o n s e of the circuit is H(f) = VouX/V\n. Since the t w o c o m p o n e n t s are in series, the current through t h e m is the same: IR = / c . Ζ is the A C i m p e d a n c e . Since V = I χ Z , (/ x Z c ) [I x ( Z R + Z c ) ] H(f) Zc (ZR + Z c) Since Z R = R and Z c = —j/a)C, H ^ = (1 + jcoRC) N o t e that as frequency (or ω = 2rrf) a p p r o a c h e s z e r o , the magnitude of the transfer function | H(f)\ a p p r o a c h e s 1, or no attenuation.
The case of an A C bridge, usually o n e leg is left as purely resistive, making it easier to balance the u n k n o w n reactive element in the other leg. 3 The Sample-and-Hoid Amplifier A n o t h e r special analog circuit, extremely useful in data acquisition applications, is the sample-and-hold amplifier shown in Figure 3-18. This is used to get a stable sample of a changing analog signal, prior to using an A D C . T h e field-effect transistor ( F E T ) acts as a switch, charging the capacitor to the analog signal's present voltage level w h e n the sample line 4 is a s s e r t e d .
A D C W h e a t s t o n e bridge is shown in Figure 3-17. If the resistance values are set so that there is no voltage a c r o s s the m e t e r (and no c u r r e n t through it), the bridge is said to be balanced. At b a l a n c e , it can be s h o w n that R\/R3 = R2/R4. Typically a resistive s e n s o r is placed in a bridge circuit to p r o d u c e a voltage signal o u t p u t . Usually, o n e of the resistors in the bridge is the variable sensor element, and initially the bridge is not balanced.