Evaluering i TFY4190 Instrumentering

I faget Instrumentering består deler av evalueringen av en fire-timers prøve, der alle bøker samt Internett er tillatte hjelpemidler. I den forbindelse kan det være greit å ha en oversikt over nettsider med relevant informasjon. Linkene er forsøkt sortert slik pensumlisten er inndelt, enn hvor ulogisk den kan være.

Generelt

• Pensumliste våren 2007
• Innsamlede svar på repetisjonsoppgaver våren 2007
• Glossary of Electrical Engineering Terms
• ELFA

Lab-oppgaver

• Lab-oppgave 3 (PID-controller)

Tall i datamaskiner

• Wikipedia: BCD (Se "Packed BCD" for 8421-BCD)
• Wikipedia: Gray code
• ASCII-tabell
• Kalkulator mellom binære, hexadesimale og desimale tall

Flyttall

• Wikipedia: Floating point
• Wikipedia: IEEE floating point standard (Se avsnitt "A more complex example" for fremgangsmåte)

Representasjon av negative tall

• Wikipedia: Exponent bias
• Wikipedia: Two's complement
• Wikipedia: Signed number representations (Bl.a. one's complement)

Støy

• Wikipedia: Ground
• Wikipedia: Electronic noise (Bl.a. liste over støytyper)

Støytyper

• Wikipedia: Shot noise
• Wikipedia: Johnson-Nyquist noise (Termisk støy)
• Wikipedia: White noise

Data-konvertering

• Strøm til spenning ved bruk av inverterende op-amp
• En bra introduksjon til AD-convertering

AD-convertere

• Wikipedia: AD-converter
• Flash-type AD-converter (Se spesielt siste kretstegning som kraftig forenkler Northrop s. 618)
• Wikipedia: Successive Approximation ADC
• Delta-Sigma-ADC

Sampling

• FFT og spektralanalyse i Matlab (siden Matlab er tilgjengelig)
• Sample and Hold
• Wikipedia: Sample and Hold
• Wikipedia: Anti-aliasing

Signaloverføring

• Wikipedia: Characteristic impedance
• Eksterne forelesningsnotater om transmisjonslinjer

Diverse

• Wikipedia: Thermocouple
• Wikipedia: Operational amplifier applications (forskjellige op-amper)

Flervalgsoppgaver

Før evalueringen våren 2007 ble der lagt ut eksempeloppgaver. Under følger et utvalg av disse med svar.

• An anti-alias filter is

Placed berore the input to remove frequencies above the Nyquist limit

• The resolution of a DAC depends on

The number of bits

• A LabVIEW program gives the value of an integer as 65534. You know that this actually is a small negative number, but represented as an unsigned 16-bit integer. The small number is

-2 

• In addition to letters and numbers, the 7-bit ASCII code has codes for

Codes for communication control

• If the transfer function of a regulator has poles in the right half plane

The output will increase exponentially with time

• Suppose we have a small signal in the range 0 - 2 mV. It can be amplified by a factor of 1000. We have the choice of two AD converters, one 12 bit with range ± 10V and one 10 bit with range 0 - 5V. Which one has the best resolution?

They are equal

• Thermocouples need zero-point correction because

Their output gives the temperature difference between two junctions

• Shot noise has a frequency dependance that is called

White noise 

• One of the following units is not used for magnetic fields:

Henry

• The transmission velocity of a signal on a coaxial line depends mainly on

The dielectric

• Which of these number representations have more than one representation for zero?

Sign + magnitude AND 1-complenent. (there is an error in the question, so it is removed from the test)

• A LabVIEW program is used to read the output of a 12-bit AD converter with range ± 10V. The binary output is available in 2-complement form. By some reason, the program gives the result in hex as C8A. Then the voltage is

-4,33 V

• A 300 ohm transmission line is terminated with a standard 50 ohm pure resistive termination. A signal is transmitted on the line.

There will be a phase reversal of the reflected signal