AB03
COMMON BASE PNP
TRANSISTOR CHARACTERISTICS
Analog Lab
Experiment Board
Ver. 1.0
QUALITY POLICY
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Electronic Equipments for Technology Training by
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Research, Modern manufacturing techniques and
continuous improvement in Quality of the products
and Services with active participation of employees.
An ISO 9001: 2000 company
94-101, Electronic Complex, Pardesipura INDORE-452010, India.
AB03
Tel.: 91-731-2570301 Fax: 91-731-2555643
Email: info@scientech.bz Web: www.scientech.bz
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COMMON BASE PNP TRANSISTOR CHARACTERISTICS
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TABLE OF CONTENTS
1.Introduction
4
2. Theory
6
3.Experiment
9
To study the characteristics of NPN transistor
in common base configuration and to evaluate –
Input resistance, Output resistance
and Current gain.
4.Datasheet
16
5.Warranty
18
6.List of Service Centers
19
7.List of Accessories with AB03
20
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INTRODUCTION
AB03 is a compact, ready to use TRANSISTOR CHARACTERISTICS
experiment board. This is useful for students to plot different characteristics
of PNP transistor in common base configuration and to understand various
region of operation of PNP transistor. It can be used as stand alone unit with
external DC power supply or can be used with SCIENTECH ANALOG
LAB ST2612 which has built in DC power supply, AC power supply,
function generator, modulation generator, continuity tester, toggle switches,
and potentiometer.
List of Boards :
Model
Name
AB01
AB02
AB04
AB05
AB06
AB07
AB08
AB09
AB10
AB11
AB12
AB13
AB14
AB15
AB16
AB17
AB18
AB19
AB20
AB21
AB22
AB23
AB25
Diode characteristics (Si, Zener, LED)
Transistor characteristics (CB NPN)
Transistor characteristics (CE NPN)
Transistor characteristics (CE PNP)
Transistor characteristics (CC NPN)
Transistor characteristics (CC PNP)
FET characteristics
Rectifier Circuits
Wheatstone Bridge
Maxwell’s Bridge
De Sauty’s Bridge
Schering Bridge
Darlington Pair
Common Emitter Amplifier
Common Collector Amplifier
Common Base Amplifier
Cascode Amplifier
RC-Coupled Amplifier
Direct Coupled Amplifier
Class A Amplifier
Class B Amplifier (push pull emitter follower)
Class C Tuned Amplifier
Phase Locked Loop (FM Demodulator & Frequency
Divider / Multiplier)
Multivibrator ( Mono stable / Astable)
F-V and V-F Converter
V-I and I-V Converter
AB28
AB29
AB30
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AB03
AB31
AB32
AB33
AB35
AB39
AB41
AB42
AB43
AB44
AB45
AB49
AB51
AB52
AB54
AB56
AB57
AB58
AB59
AB64
AB65
AB66
AB67
AB68
AB80
AB82
AB83
AB84
AB85
AB88
AB89
AB90
AB91
AB92
AB93
AB96
AB97
AB101
AB102
AB106
Zener Voltage Regulator
Transistor Series Voltage Regulator
Transistor Shunt Voltage Regulator
DC Ammeter
Instrumentation Amplifier
Differential Amplifier (Transistorized)
Operational Amplifier (Inverting / Non-inverting
Differentiator)
Operational Amplifier (Adder/Scalar)
Operational Amplifier (Integrator/ Differentiator)
Schmitt Trigger and Comparator
K Derived Filter
Active filters (Low Pass and High Pass)
Active Band Pass Filter
Tschebyscheff Filter
Fiber Optic Analog Link
Owen’s Bridge
Anderson’s Bridge
Maxwell’s Inductance Bridge
RC – Coupled Amplifier with Feedback
Phase Shift Oscillator
Wien Bridge Oscillators
Colpitt Oscillator
Hartley Oscillator
RLC Series and RLC Parallel Resonance
Thevenin’s and Maximum power Transfer Theorem
Reciprocity and Superposition Theorem
Tellegen’s Theorem
Norton’s theorem
Diode Clipper
Diode Clampers
Two port network parameter
Optical Transducer (Photovoltaic cell)
Optical Transducer (Photoconductive cell/LDR)
Optical Transducer (Phototransistor)
Temperature Transducer (RTD & IC335)
Temperature Transducer (Thermocouple)
DSB Modulator and Demodulator
SSB Modulator and Demodulator
FM Modulator and Demodulator
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………… and many more
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AB03
THEORY
Transistor characteristics are the curves, which represent relationship
between different dc currents and voltages of a transistor. These are helpful
in studying the operation of a transistor when connected in a circuit. The
three important characteristics of a transistor are:
1.
Input characteristic.
2.
Output characteristic.
3.
Constant current transfer characteristic.
Input Characteristic :
In common base configuration, it is the curve plotted between the input
current (IE) verses input voltage (VEB) for various constant values of output
voltage (VBC).
The approximated plot for input characteristic is shown in fig. 1. This
characteristic reveal that for fixed value of output voltage VBC, as the base
to emitter voltage increases, the emitter current increases in a manner that
closely resembles the diode characteristics.
Fig. 1
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Output Characteristic :
This is the curve plotted between the output current IC verses output voltage
VBC for various constant values of input current IE.
The output characteristic has three basic region of interest as indicated in
fig.2 the active region, cutoff region and saturation region.
In active region the collector base junction is reverse biased while the base
emitter junction if forward biased. This region is normally employed for
linear (undistorted) amplifier.
In cutoff region the collector base junction and base emitter junction of the
transistor both are reverse biased. In this region transistor acts as an OFF
switch.
In saturation region the collector base junction and base emitter junction of
the transistor both are forward biased. In this region transistor acts as an ON
switch.
Fig. 2
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Constant current transfer Characteristic :
This is the curve plotted between output collector current IC verses input
emitter current IE for constant value of output voltage VBC.
The approximated plot for this characteristic is shown in Fig 3.
Fig. 3
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EXPERIMENT
Objective :
To study the characteristics of PNP transistor in common base
configuration and to evaluate
1.
Input resistance
2.
Output resistance
3.
Current gain
Apparatus required :
1.
Analog board of AB03.
2.
DC power supplies -12V, +5V from external source or ST2612
Analog Lab.
3.
Digital Multimeter (3 numbers).
4.
2 mm patch cords.
Circuit diagram :
Circuit used to plot different characteristics of transistor is shown in Fig 4.
Fig. 4
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Procedure :
•
Connect +5V and -12V dc power supplies at their indicated position
from external source or ST2612 Analog Lab.
•
To plot input characteristics proceed as follows :
1.
Rotate both the potentiometer P1 and P2 fully in CCW (counter
clockwise direction).
2.
Connect Ammeter between test point 2 and 3 to measure input
emitter current IE(mA).
3.
Short or connect a 2mm patch cord between test point 4 and 2
4.
Connect one voltmeter between test point 1 and ground to measure
input voltage VEB other voltmeter between test point 6 and ground to
measure output voltage VBC.
5.
Switch ON the power supply.
6.
Vary potentiometer P2 and set a value of output voltage VBC at some
constant value (1V, 2V..)
7.
Vary the potentiometer P1 so as to increase the value of input voltage
VEB from zero to 0.9V in step and measure the corresponding values
of input current IE for different constant value of output voltage VBC
in an observation Table 1.
8.
Rotate potentiometer P1 fully in CCW direction.
9.
Repeat the procedure from step 6 for different sets of output voltage
VBC.
10.
Plot a curve between input voltage VEB and input current IE as shown
in Fig 1 using suitable scale with the help of observation Table l.
This curve is the required input characteristic.
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Observation Table 1 :
S.no.
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
Input
voltage
VEB
Input current IE(mA) at constant value of
output voltage
VBC = 1V
VBC = 3V
VBC =5V
0.0V
0.1V
0.2V
0.3V
0.4V
0.5V
0.6V
0.7V
0.8V
0.9V
•
To plot output characteristics proceed as follows:
1.
Switch OFF the power supply.
2.
Rotate both the potentiometer P1 and P2 fully in CCW
(counterclockwise direction).
3.
Connect voltmeter between test point 6 and ground to measure
output voltage VBC.
4.
Connect one Ammeter between test point 2 and 3 to measure input
current IE(mA) and other Ammeter between test point 4 and 5 to
measure output current IC(mA).
5.
Switch ON the power supply.
6.
Vary potentiometer P1 and set a value of input current IE at some
constant value (0mA, 1mA...)
7.
Vary the potentiometer P2 so as to increase the value of output
voltage VBC from zero to maximum value in step and measure the
corresponding values of output current IC for different constant value
of input current IE in an observation Table 2.
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8.
Rotate potentiometer P2 fully in CCW direction
9.
Repeat the procedure from step 6 for different sets of input current IE.
10.
Plot a curve between output voltage VBC and output current IC as
shown in Fig 2 using suitable scale with the help of observation
Table 2. This curve is the required output characteristic.
Obseravtion Table 2 :
Output current IC (mA) at constant value of
Output
input current
S.no. voltage
VBC IE = 0mA IE = 1mA IE = 2mA IE = 3mA IE = 4mA
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
-1.0V
0.0V
0.5V
1.0V
2.0V
3.0V
4.0V
5.0V
6.0V
7.0V
•
To plot constant current transfer characteristics proceed as follows:
1.
Switch OFF the power supply.
2.
Rotate both the potentiometer P1 and P2 fully in CCW (counter
clockwise direction).
3.
Connect voltmeter between test point 6 and ground to measure
output voltage VBC.
4.
Connect one Ammeter between test point 2 and 3 to measure input
current IE (mA) and other Ammeter between test point 4 and 5 to
measure output current IC (mA).
5.
Switch ON the power supply.
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6.
Vary potentiometer P2 and set a value of output voltage VBC at
maximum value.
7.
Vary the potentiometer P1 so as to increase the value of input current
IE from zero to 10 mA in step and measure the corresponding values
of output current IC in an observation Table 3.
8.
Plot a curve between output current IC and input current IE as shown
in Fig 3 using suitable scale with the help of observation Table 3.
This curve is the required Transfer characteristic.
Observation Table 3 :
S.no.
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
Input
current
IE (mA)
0.0 mA
1.0 mA
2.0 mA
3.0 mA
4.0 mA
5.0 mA
6.0 mA
7.0 mA
8.0 mA
9.0 mA
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Output current IC (mA) at
constant output voltage = 10 V
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Calculations :
1.
Input resistance: It is the ratio of change in the input voltage VEB to
change in the input current IE at constant value of output voltage VBC
or it is the reciprocal of the slope obtained from the input
characteristic.
Mathematically
To calculate input resistance determine the slope from the input
characteristic curve obtained from observation Table 1. Reciprocal of
this slope will give the required input resistance.
2.
Output resistance: It is the ratio of change in the output voltage V BC
to change in the output current IC at constant value of input current IE
or it is the reciprocal of the slope obtained from the output
characteristic.
Mathematically
To calculate output resistance determine the slope from the output
characteristic curve obtained from observation Table 2. Reciprocal of
this slope will give the required output resistance.
3.
Current gain: It is the ratio of change in the output current IC to
change in the input current IE at constant value of output voltage VBC
or it is the slope obtained from the constant current transfer
characteristic. It is denoted by αac.
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Mathematically
αac = Slope of constant current transfer characteristic = ∆IC
∆IE
To calculate current gain, determine the slope from the constant current
transfer characteristic curve obtained from observation Table 3. This slope
is the required current gain.
Results:
Input resistance Rin
= ________________
Output resistance Rout = ________________
Current Gain αac
= ________________
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DATASHEET
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AB03
WARRANTY
1) We guarantee the instrument against all manufacturing defects during
24 months from the date of sale by us or through our dealers.
2) The guarantee covers manufacturing defects in respect of indigenous
components and material limited to the warranty extended to us by the
original manufacturer, and defect will be rectified as far as lies within
our control.
3) The guarantee will become INVALID.
a) If the instrument is not operated as per instruction given in the
instruction manual.
b) If the agreed payment terms and other conditions of sale are not
followed.
c) If the customer resells the instrument to another party.
d) Provided no attempt have been made to service and modify the
instrument.
4) The non-working of the instrument is to be communicated to us
immediately giving full details of the complaints and defects noticed
specifically mentioning the type and sr. no. of the instrument, date of
purchase etc.
5)
The repair work will be carried out, provided the instrument is
dispatched securely packed and insured with the railways. To and fro
charges will be to the account of the customer.
DESPATCH PROCEDURE FOR SERVICE
Should it become necessary to send back the instrument to factory please
observe the following procedure:
1) Before dispatching the instrument please write to us giving fully details
of the fault noticed.
2) After receipt of your letter our repairs dept. will advise you whether it
is necessary to send the instrument back to us for repairs or the
adjustment is possible in your premises.
Dispatch the instrument (only on the receipt of our advice) securely packed
in original packing duly insured and freight paid along with accessories and
a copy of the details noticed to us at our factory address.
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LIST OF SERVICE CENTERS
1. Scientech Technologies Pvt. Ltd.
90, Electronic Complex
Pardesipura,
INDORE – 452010
2. Scientech Technologies Pvt. Ltd.
First Floor, 14, Uday Park,
NEW DELHI – 110049
3. Scientech Technologies Pvt. Ltd.
New no.2, Old no.10, 4th street
Venkateswara nagar, Adyar
CHENNAI – 600025
4. Scientech Technologies Pvt. Ltd.
202/19, 4th main street
Ganganagar,
BANGALORE- 560032
5. Scientech Technologies Pvt. Ltd.
8,1st floor, 123-Hariram Mansion,
Dada Saheb Phalke road,
Dadar (East), MUMBAI –400014
6. Scientech Technologies Pvt. Ltd.
988, Sadashiv Peth,
Gyan Prabodhini Lane,
PUNE – 411030
7. Scientech Technologies Pvt. Ltd
SPS Apartment, 1st Floor
2, Ahmed Mamoji Street,
Behind Jaiswal Hospital,
Liluah, HOWRAH-711204 W.B.
8. Scientech Technologies Pvt. Ltd
Flat No. 205, 2nd Floor,
Lakshminarayana Apartments
‘C’ wing, Street No. 17,
Himaytnagar,
HYDERABAD- 500029
Scientech Technologies Pvt. Ltd.
Ph: (0731) 5202959
Email: info@scientech.bz
Ph.: (011) 26513912, 26864943
Fax: (011) 26864943.
Email: ndel@scientech.bz
Ph.: (044) 42187548, 42187549
Fax: (044) 42187549
Email: chennai@scientech.bz
Ph.: (080) 51285011
Fax: (080) 51285022
Email: bangalore@scientech.bz
Ph.: (022) 56299457
Fax: (022) 24168767
Email: stplmum@vsnl.net
Ph.: (020) 24461673
Fax: (020) 24482403
Email: pune@scientech.bz
Ph.: +913355266800
Email: kolkata@scientech.bz
Ph.: (040) 55465643
Email: hyd@scientech.bz
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LIST OF ACCESSORIES
1.
2mm Patch cord (red) ...............................................................2 Nos.
2.
2mm Patch cord (black) ...........................................................2 Nos.
3.
2mm Patch cord (blue) .............................................................1 Nos.
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