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IN PLANT TRAININGREVIEW
Done at:
y BEL:28TH June -3rd July 2010
y TVS ELECTRONICS: 20TH Dec-30TH Dec 2010
y DOORDARSHAN: 13TH June -17TH June 2011
BY:
Adeline Steffi U- 08BEC014
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Bharat Electronics
Limited,
Chennai
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INTRODUCTION
y A PSU under the Govt. of India and Ministry of Defence
y Develops Military Communication Systems, RADARs andSONARs, Naval Systems, Telecom & Broadcast Systems,
Electronic Warfare Systems, Tank Electronics with theIndian Armed Forces as the primary client
y The Chennai unit is differentiated into three departments
y ASSEMBLY
y INSPECTION AND TESTING
y QUALITY MANAGEMENT
y It mainly carries out supporting activities for theproduction of Tanks T-72,T-90 and Arjun at the Avadi
Heavy Vehicles Factory
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ASSEMBLY
y Two parts of Tank- Turret(top) and Hull(down)
y Procedures used :
y Casting
y Soldering
y Conformal Coating (Humisealing)
ketone-10%+ xylole-45%+
butyl alcohol-20%+ toloule-25%
1ST
±clean with Isopropyl Alcohol. 2ND- heat in the oven at 50 Celsius for 10 minutes.
3RD- keep the PCB for humisealing in spray oven for 30minutes then dry the PCB.
y Desoldering
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ASSEMBLY Cont.y Komax kappa Cut and Strip machine It uses a high level of
automation to simplify processes
Other Components:y Optronic Pedestal System
Opto Electronics and Thermal Imager Products on display will be Night Vision Binoculars; Night Vision Goggles;Night Weapon Sights; Hand Held Thermal Imager
y Safety and Fire Equipmenty Tank Fire Control System MK 1B AL 4421 is designed to
reduce the engagement time leading to an increase in killrate and to improve the first round hit probability .
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TESTING & INSPECTION
y Testing is done at PCB level & unit level
y Most components have a feedback loop for error
control and correction
Linear AccelerationTransmitter
Error voltage Amplidyne-amotor withtwo control windings
Gunpositioncorrected
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TESTING & INSPECTION Cont.y Two modes of Gun Rotation:
Transverse mode- Amplidyne- 2 control winding in whichI flows and where the I is more the Gun rotates in thatdirection
Elevation Mode-Hydraulics-Based on difference inpressure
y Gun Terminologies
LAT-Linear Acceleration Transmitter For rough surface elevate then stabilize when turret
moves(between -15 to +55)
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TESTING & INSPECTION Cont. Angle Cruise-notifies when gun reaches maximum position
Protection Unit
GSD-Gun Setting Device Set gun at loading level to load with ammunition
Correction Unit
Russian: Mechanical based systems
Indian: Solid state electronics based systems
Memory Unit-ammunition are loaded (22 in general) andthe quantity stored is displayed on LCD(in binary form)
ALG-Auto Loading Gear- Disposing the cap of theammunition loaded .
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TESTING & INSPECTION Cont. Various Tests Conductedy Vibration Test
y Leak Test
y High and Low Temperature Test
The Gun Firing Controlsy Loading Control Panel- with commander
y Gunner Control Panel- with Gunner
Advanced Land Navigation SystemModes of operation:
y Inertial-Inertial Measurement Unit and Gyrometer
y GPS-Satellite
y Hybrid ±Both the above
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QUALITY MANAGEMENTObjectives:
y To ensure correctness of incoming parts-IG inspection
y High R meter, Digital microscope, SAP for databaseprecision
y To ensure accuracy of measurement through calibrationOf Power Supply using Regulated DC Supply, Multi-meter
y Goods only from Approved Vendors-AVD
y Sample Test ±Only 3 from a lot is Tested if 1 is bad the whole lot is rejected and send back
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QUALITY MANAGEMENT Cont.y To inspect cable harnesses within cycle time
y Continuity Test
As per the given document from one end to another usingbuzzers
y Insulation Resistance Test
applying 500v DC to check the shock the tank can withstand
y Insertion Loss Test
power loss from one end to the other in dBy Dielectric Measurement
AC voltage to measure dielectric strength and find thebreakdown voltage
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TVS
ELECTRONICS,
CHENNAI
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INTRODUCTIONy TVS Electronics designs, manufactures and
distributes IT products, dot matrix printers, point of sale terminals, printer supplies , keyboards , mouse,uninterruptible power supplies, and set top boxes. TVSElectronics was established in 1986. TVS Electronics hasa strong market presence in India
y At the R&D section the different printer types were coded
to perform their operation and testing were carried on
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Modes of operation of a printer
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ICS USED IN TRUMP RP45 POS
y LB1847
The LB1847 is a driver IC for stepping motors with PWM current control (fixed OFF time). A specialfeature of this IC is that VREF voltage is constant whilethe current can be set in 15 steps, allowing drive of motors ranging from 1-2 phase exciter. The current
decay pattern can also be selected (SLOW DECAY,FAST DECAY, MIX DECAY) to increase the decay of regenerative current at chopping OFF, there by improving response characteristics.
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At present DRV8821 ICs are used:y Two independent stepper motor driver circuits include
four H-bridge drivers and microstepping-capableindexer logic. Each of the motor driver blocks employ N-channel power MOSFETs configured as an H-bridge
to drive the motor windings.
y A simple step/direction interface allows easy interfacing to controller circuits. Pins allowconfiguration of the motor in full-step, half-step,quarter-step, or eighth step modes, and the selection
of slow or mixed decay modes.y Internal shutdown functions are provided for over
current protection, short circuit protection, under voltage lockout and over temperature.
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TRUMP RP-45 POSy
Task 1- I Analyzed the different modes of the printerusing a digital CRO to capture the current and voltage waves in a floppy and to print the maintenance mode
y The different modes set were
1. Draft
2. Roman
3. HS Draft
y The different CPI(characters per inch)
1. 12
2. 15
3. 17
4. 20
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TRUMP RP-45 POS Cont.
y Task 2- To check if the printer gave the required output voltage for the normal input range 180v-220v (by
connecting to domestic switch board AC supply) andthen for extremes such as 160v, 240v and 250v and300 bills are printed if it does not get printedsuccessfully then there is some grounding problem which is rectified and tested again
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Dot Matrix Printers:
y A dot matrix printer or impact matrix printer is a typeof computer printer with a print head that runs back andforth, or in an up and down motion, on the page and printsby impact, striking an ink-soaked cloth ribbon against the
paper, much like the print mechanism on a typewriter.y 2 types
y 9 wire- one character is printed using 9 pins
y 24 wire- one character is printed using 24 pins so has better
quality y 2 types of motors used:
Carriage motor: used for movement from left to right
Paper feed motor: pull the paper upward to move to the next line
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Doordarshan
Kendra ,
Chennai
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INTRODUCTION
y Doordarshan is an Indian public service broadcaster,a division of Prasar Bharati. It is one of the largestbroadcasting organizations in India in terms of the
infrastructure of studios and transmitters. Recently, ithas also started Digital Terrestrial Transmitters. OnSeptember 15, 2009, Doordarshan celebrated its 50thanniversary . The DD provides television, radio, onlineand mobile services throughout metropolitan andregional India, as well as overseas through the IndianNetwork and Radio India
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Satellite Parameters
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Various sections in DD Kendra
y The studio: It has 4 Studiosy Studio 1: Huge used for recording of big events such as music
performance
y Studio 2: Used for regional transmission of news for Podhigai
and for various announcements
y Studio 3&4: used for small recording such as children shows
5 components of studio:
Camera and lighting, camera control unit, video
switcher at production control room , Audio ControlUnit and master switching room
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Types of Modulationy Positive modulation
The increase in picture brightness causes increase in the amplitude of
the modulation envelope
y N egative modulationThe increase in picture brightness causes reduction in carrieramplitude i.e. the carrier amplitude will be maximum corresponding tosync tip and minimum corresponding to peak white
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Modulated carriers
MODULATING SIGNAL
(A) POSITIVE MODULATION (B) NEGATIVE MODULATION
CARRIER
-v
+v
0 t
-v
+v
0 t
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Why negative modulationy Pictures contain more information towards white than
black and hence the average power is lower resulting inenergy saving. (Bright picture points correspond to a low
carrier amplitude and sync pulse to maximum carrieramplitude).
y Impulse noise peaks appear only in black region in negativemodulation. This black noise is less objectionablecompared to noise in white picture region.
y Best linearity can be maintained for picture region and any non-linearity affects only sync which can be correctedeasily .
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TV Transmittersy High Power TV Transmitters
y both the signals (video and audio) modulate the carrier waves whose frequencies and types of modulations are
as per established standards. These modulated carriersare further amplified and then diplexed for transmissionon the same line and antenna.
y Low Power TV Transmittersy both the signals (video and audio) are modulated
separately but amplified jointly using common visionand aural amplifier.
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Source and channel codingy Source coder removes non-essential and redundant
parts of the picture signal and performs the bit-ratereduction process.
y Digital compression techniques enable the original datato be compressed so that it can readily be transmittedover the existing transmission path.
y Digital compression techniques allow many different
programmes to be simultaneously transmitted over asingle channel.
y Channel encoder optimises the data for the particularmodulation system and transmission channel.
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Digital Earth Station Earth Station is a uplink center from which the
signals are fed to Satellite for distribution in aspecified area covered by the Satellite.
The signal is up-linked from the earth station andreceived by many down link centers in TV broadcasting.
It is a very important part of satellitecommunication system for broadcasting of signals.
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3D TVy The depth can be seen as there is a 7cm difference between
the 2 eye balls so 2 cameras which are placed at a distanceof 7cm are used to capture left and right signal
y 3 Technique to reach the eye
y By using glasses with different colors such as blue and
red for left and right eye respectively .
color issue.
y Polarization Glass- Vertical polarized glass to the righteye and horizontally polarized glass to the left eye. Nocolor issue
y Shutter Method- . It has a Transmitter at TV a wifi or
Bluetooth and first transmits signal only for the lefteye and the right eye shutter is closes and then thenext frame to the TV is a right eyed signal so left eyeshutter is closed and right eye views it
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Acknowledgement:I thank my department
SENSE and Program Manager whopermitted me to do my in planttraining and provided me with
endorsement letters for the samegain knowledge about the company and their work ethics
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THANK YOU!!!!