Eit Exp 4 Fun Gen_ps

8/9/2019 Eit Exp 4 Fun Gen_ps

http://slidepdf.com/reader/full/eit-exp-4-fun-genps 1/10

PUNE INSTITUTE OF COMPUTER TECHNOLOGY, PUNE - 411043

Department ! E"e#trn$#% & Te"e#mm'n$#at$n

CLASS : S.E. E &TC SUBJECT : EIT

EXPT. NO. : 4 DATE:

TITLE : STUDY OF LABORATORY INSTRUMENTS

O()ECTI*E + To study the specifications and use of front panel

controls for

1. DC power supply2. AC function generator

APPARATUS : 1. Digital multimeter with probes

2. Resistor of 50 !"#$%

&. 'unction generator with probes

#. CR( with probes

THEORY :1. DC power !pp"#

To con)ert the readily a)ailable 2&0*+ 50,- electric power to the

DC form+ a DC power supply is used power supplies can bedesigned to pro)ide either constant )oltage !C*% or constant

current !C*%. ome power supplies can be operated in either of

the mode+ which is referred to as C*/CC models.

B"o$% '()r(* o+ DC power !pp"#:

P:F:-LTL-UG/03/R1 EIT4.1

*out

out

*out

out

*out

out

a% deal !C*%power supply

b% deal !CC%power supply

c% deal !C* / CC%power supply





,

De$r'p-'o :

The incoming AC )oltage is first stepped down by atransformer. The transformer AC )oltage is fed to a rectifier+ which

con)erts the ac )oltage to rectified DC )oltage. The rectified

wa)eform is then fed to a filter that smooths out )ariation or ripple

in the rectified wa)eform. The filtered wa)eform is fed to a

regulating circuit to allow adustments of the output le)el and eepthe output )oltage constant once the le)el is chosen.

The ability of power supply to eep a )oltage constant once an

output le)el is chosen is referred to as its regulation ability.

ince instrumentation circuits generally re3uire )ery small

currents+ power supplies can be placed inside an instrument.De)ices which are used in this are regulator Cs lie 4&1$. There


Transformer Rectifier

Filter Re!lator

"te# $o%n

&oltae' (0)*

In#!t:

230+'(0)*Rectifie$

&oltae

, o!t#!t &oltae

%it ri##le

R L

t

+

t

+

t

+

t

+

t

+

"!##l o!t#!t:a$!stale ,&oltae relati&elin$e#en$ent of

canes in in#!t +





are o)er a hundred types of C regulator. ost of them are )ery

simple to use and well documented by the manufacturer.

C!rre- L'*'-') I Power S!pp"'e: 6hile using a power supply+ the current re3uirement of the

load can )ary. 7nder the e8treme conditions of a short circuit in the

load+ a )ery high current is deli)ered by the power supply. To

pre)ent this+ electronic current limiters are included in the power

supply. They limit the ma8. current flowing in the circuit regardlessof output )oltage re3uired. ome power supply models feature a

)ariable current9limit control that allows the setting of limitingcurrent )alue.

DC Power S!pp"# pe$'+'$(-'o :

1. DC (utput : Range of DC )oltage or currents a)ailable

2. AC nput : Characteristics of the ac )oltage re3uired todri)e the power supply. !7sually 2&0* ;10<+

509=0,-%

&. 4oad Regulation : The change in the DC output )oltage due tochange in load resistance )alue that results insupplies ma8. rated output current !'ull load

condition%

#. 4ine regulation : The change in DC output )oltage of the supply

resulting from a change in the input line)oltage from its lowest to highest )alue.

5. Ripple > ?oise : Describe the rms )alue of the ac component

that remains unfiltered and superimposed on

the DC output. !Typically 50µ* to 1m*%

=. (utput mpedance : 'or constant *oltage source the outputimpedance should be )ery small!→0%

'or constant Current source the output

impedance should be )ery large!→∞%

$. Temperature rating : The temperature range o)er which supply can

operate and remain within its capabilities.








1. ine wa)e and s3uare wa)e are used for general purpose

testing of circuits such as amplifiers.2. 3uare wa)e is used to chec the transient response of the

circuits as well as to chec the fre3uency response of

wideband amplifiers.&. Triangular wa)es are useful for testing circuits lie

comparators to determine the threshold.

Spe$'+'$(-'o o+ +!$-'o )eer(-or:

1. 're3uency range : This is the upper and lower fre3uency

limits of the output signal which thegenerator can supply.

2. (utput )oltage : t specifies the type of output wa)eformand the output )oltage range the

generator can supply.

&. Accuracy and dial

resolution : Accuracy of the generator specifies howclosely the output fre3uency corresponds

to the fre3uency indicated on the dial.

Dial resolution indicates to whatpercentage of the output fre3uency )aluethe dial setting can be read.

#. Amplitude and

fre3uency stability : Amplitude stability is a measure of an

oscillator@s ability to maintain a constant)oltage amplitude with change in the

fre3uency of the output signal. 're3uency

stability determines how closely the

oscillator maintains a constant fre3uencyo)er gi)en time period.

5. 6a)eform distortion : t specifies how closely the sinusoidal

output wa)eform of the function

generator resembles a pure sine wa)e. t

is specified in <.=. (utput impedance : t specifies the output impedance of the

function generator which generally

matches with the characteristic

impedance of the co9a8ial cable in R'

circuits or the characteristics impedance

P:F:-LTL-UG/03/R1 EIT4.(





of the communication systems in A'

systems.

SPECIFICATION OF PO2ER SUPPLY: M(%e : APLABMoe": L 3//

Spe$'+'$(-'o :

(utput )oltage * : 09&2* DC continuously )ariable by coarse

and fine controls A : 092A DC continuously )ariable by coarse

and fine controls4oad regulation C* : ±0.01< plus 2m* !for the load )ariation

from no load to full load%CC : ±0.1< plus 250µA !for the change in

output )oltage from 0 )olt to ma8imumoutput )oltage%

4ine regulation C* : ±0.01< plus 2m* !for ±10< change in

mains supply%

CC : ±0.1< plus 250µA !for ±10< change in

main supply%Ripple and noise C* : 1m* !r.m.s.% ma8.!20,- to 20,-% CC : 0.0#< !r.m.s.% ma8.

tability at constant C* : 0.2< 5m*

Ambient temp.!Bhrs. after

6arm9up of &0minutes%

CC : ±0.5< 2mA

0ENERAL :

etering : Two separate & digits D@s are pro)ided

on front panel to monitor the output

)oltage and load current continuously.eter accuracy : ±& counts

(perating temp. range : 0950 deg0C

rotection : The power supply is electronically

protected against o)erload and short

P:F:-LTL-UG/03/R1 EIT4.





circuit by means of automatic cross9o)er

characteristics.nput power re3uirements : 2&0* AC ±10<+ 50,- ingle phase

Dimensions!6,D% : 210mm1&&mm250mm

?ote:9 C*: Constant )oltage mode CC: constant current mode

SPECIFICATION OF FUNCTION 0ENERATOR: M(%e : APLABMoe": /5

Spe$'+'$(-'o :

Fre6!e$# R()e : 0.0&,- to &,- in $decade ranges.

Fre6!e$# I'$(-'o : ;1< of full scale.A$$!r($#

O!-p!- 2(7e+or* : inusoidal+ Triangle+ Ealanced 3uare and DC.

S'e D'-or-'o : F &<.

M(8'*!* o!-p!- 7o"-()e:a% nto 50 ohms : 10* p9p on sine+

triangle and s3uare.b% (pen Circuit : 20* p9p on sine+

triangle and s3uare.

Le7e" A$$!r($# : ;0.5dE upto 200G,- range.

;1.0dE for &,- range.

A--e!(-or : Two step attenuators of 20dE > #0dE.

'ine attenuation of 20dE through )erniercontrol.

A--e!(-or A$$!r($# : ;0.5dE per 20dE at 1G,-.

DC O++e- : ;5* ;5< in open circuit.

;2.5* ;5< in 50 ohms.

1./ PO2ER SUPPLY

*oltage : 2&0* AC ;10<+ 50,-.

Consumption : 15*A.






1.3 PHYSICAL

Dimensions : 2&5 !6% 8 B5 !,% 8 2&5 !D% mm.

6eight : & Gg. !Appro8.%.

OBSER9ATION TABLE:

Power S!pp"#

C9 Se- 9("!e CC Se- 9("!e Oer7e C9 & CC (- "o( Co'-'o

Sr.No. Lo( C!rre- 9o"-()e O!-p!-1 *A/ 1*A3 /*A4 3*A

; 4*A< ;*A

9 o Lo( = 9 F!"" Lo( Lo( Re)!"(-'o > ????????????????????

9 F!"" Lo(

F!$-'o 0eer(-or

Fre6!e$# A*p"'-!e A--e!(-'o BSe- Oer7e Se- Oer7e @/ @4 @<






CONCLUSION: ?????????????????????????????????????????????????????

?????????????????????????????????????????????????????

?????????????????????????????????????????????????????

?????????????????????????????????????????????????????

Re+ere$e:

1. ,elfric and Cooper+ Hodern Ilectronic nstrumentation and easurement.

Tata cgraw ,ill2. Aplab ower upply nstruction anual

&. http://www.epanorama.net/lins


http://www.epanorama.net/links

http://www.epanorama.net/links





UESTION:

DC power !pp"#

1. 6hat is the ripple factorJ ,oe is it definedJ

2. 6hat is mean by regulation of a power supplyJ

&. f power supply has no9load )oltage output of 100* and full

load output of K=* 6hat is the percentage regulation of the

supplyJ

#. A power supply has open circuit output )oltage of 1.5* andthe )oltage drops to 1.#2* with 200mA of current. 6hat is

the output impedance of the supplyJ

F!$-'o )eer(-or

1. 6hat is the output impedance of the function generator you

useJ

2. Describe what effect the )alue of load impedance connectedto the output of the signal generator will ha)e on the

ma8imum )oltage that can be pro)ided by the generator.

&. 6hat is the ma8imum output )oltage !p9p% if a load

resistance of 100 is connected to the function generator youuseJ

#. 6hat is the role of attenuator switches pro)ided on the

function generatorsJ

5. Compute the pea to pea amplitude of the output )oltage

for the following

a. Triangular wa)e of &*rms with 20db attenuation!switch pressed%

b. 3uare wa)e of 10*p9p with 20db attenuator

c. ine wa)e of 10*p with #0db attenuation.

d. ine wa)e of 10*p9p with !20#0% db attenuation.


Documents

Eit Exp 4 Fun Gen_ps