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DEMONSTRATION METER, WOODEN (0452)
Developed for the classroom demonstration of the constructional features of permanent magnet moving coil type meters. Movement with spring control and magnetic damping and is fitted in transparent wooden casing with large glass window at the front and back. All interna mechanism and electrical connections are visible. Long pointer needle w!th thick arrowhead provides clear visibility from a distance. The wooden case has 4mm socket terminals on one side for electrical connections with a slot for inserting interchangeable scales just above it and a pair of knobs on the other side - one for zero adjustment and other for locking pointer needle. Can be used both as left zero and center zero meters. These are useful for demonstration as well as for actual measurements. It is made more versatile by using any of the scales from SCALES, INTERCHANGEABLE, FOR DEMONSTRATION METERS to convert it into a galvanometer, ammeter or voltmeter of different ranges. Accuracy Class Index 2.5, Scale Length 110 ? 2mm, Overall size 80 x 100 x 190mm approx.
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DEMONSTRATION METER, INTERSCALE, PLASTIC CASE (0453)
Similar to DEMONSTRATION METER, WOODEN in design and functionality but complete assembly fitted in tough, plastic frame with transparent front and back windows. Moving coil type with accuracy of ? 2. 5%. 8asic sensitivity of meter calibrated a 5mA, 100mV FSD. The meter is useful for demonstrating the working principle of AC or DC ammeters, voltmeters and galvanometers, using the various interchangeable plastic scales as per Cat. No. 1091880. Overall size 300 x 1 50 x 300mm.
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SCALES, INTERCHANGEABLE, FOR DEMONSTRATION METERS (0454)
Dial scales for use with DEMONSTRATION METER, WOODEN and DEMONSTRATION METER, INTERSCALE, PLASTIC CASE Dials made of unbreakable ABS and can be slid into the meter through a slot on one side of the frame. The dial has a suitable shunt as per the scale range, which is housed in a moulded plastic casing mounted at one end of the dial and provided with plug connectors to locate, align and connect the dial to the meter. Different ranges available are
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SPOT REFLECTING GALVANOMETER (0455)
A sensitive device suitable for Industrial Kelvin Double Bridge and Senior Kelvin Double Bridge as a null detector. Housed in a sturdy sheet metal casing with self contained lamp and scale arrangement. With LocklUnlock knob at the top; and ON/OFF switch, a pair of 4mm colour coded socket terminals for input to be measured and sensitivity adjustment knob at the front. The front scale graduated in millimeters from 0-18cm (left zero and 9-0-9cm (center zero), for reading as required. Galvanometer coil resistance 1250 Nominal, Sensitivity is 15mm/J.1A, time period 2 seconds, and critical damping resistance 10000. Operates on 220-240V AC 50/60Hz.
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GALVANOMETER EDSPOT (0456)
A highly sensitive apparatus for measuring very small charges (of the order of ?C) and currents (of the order of ?A) and as null point detector. It has an integral taut suspension movement, lamp unit and scale, the indication being presented as a hairline in a brilliant light spot on a translucent screen. The range switch enables the instrument sensitivity to be adjusted in convenient steps, whilst retaining critical damping conditions and presenting constant resistance at the instrument terminals. Provision for effectively damping any transverse suspension vibrations, without affecting the electrical characteristics of the instrument. Signal input through 4mm colour coded socket terminals, with input circuit protected against accidental inputs of high magnitude. The front scale graduated in millimeters from 0-18cm (left zero) and 9-0-9cm (center zero), for reading as required. With Lock/Unlock, zero adjustment and sensitivity adjustment at the front. Range attenuation - sensitivities of x 1x0.1, x0.01 and x 0.001, related to both current and voltage sensitivities with constant input resistance. Operates on 220-240C AC mains, 50/60Hz.
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BALLISTIC GALVANOMETERS (0457)
Used for measurement of small quantities of electrical charge and currents. Leveling Screws for balancing the coil. Coil with mirror suspended between long suspension at the upper end and a spring at lower end. Suspension and spring are made of special alloy to provide high degree of sensitivity to the movement. Movement housed in a Bakelite case, rigid and robust. Clamping arrangement for transportation. Consistent sensitivity over a longer period. Strip provided for damping its ballistic movement
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HOT WIRE METER (0458)
A simple demonstration meter model that indicates the current flowing across its terminals on the basis of heating effects of current, i.e., demonstrates the heating effects of current. A resistance wire is fixed across two 4mm socket terminals mounted on insulated plastic base. Flow of current through the wire heats it that results in its elongation. This elongation is calibrated using a simple mechanism to move the pointer indicating the current flowing through resistance wire. Transparent acrylic window mounted on top provides clear view to its working. Clamping arrangement provided at the rear makes it easily mountable on a suitable retort stand for demonstration to a group of students.
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MOUNTED MOTOR FOR SOLAR CELL (0459)
Comprises small, low power consumption, electric motor mounted on a base, specially designed to run directly from the output of the solar cell and to illustrate the direct conversion of light energy to electrical energy and then to mechanical energy. The motor spindle can spin a small fan,
about 50mm diameter, when powered by the solar cell. For use with the motor to demonstrate the production of electrical energy directly from light energy. The solar cell unit comprises a selenium photo-voltaic cell housed in a plastic case with a rectangular diffusing lens top of size 25 x 25mm. 80th units provided with colour coded 4mm sockets for connections.
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SOLAR ENERGY KIT (0460)
A completely self contained kit mounted on a sturdy sheet metal box and provides all the necessary components for demonstrating the conversion of solar energy into electrical energy, sound energy and light energy. Comprises a solar cell with a lead terminating into 4mm plug for output that can be plugged in respective sockets on top of the metal box. Input sockets provided and marked clearly for cell holder (for battery charging-storage of energy), voltmeter, bulb, buzzer and electrical motor.
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CAPACITANCE SUBSTITUTION BOX (0461)
With 8 preferred value capacitors mounted on a small baseboard with terminals for connecting in a circuit. Values of capacitances available are 0.001, 0.0022, 0.0047, 0.01, 0.022, 0.047, 0.1 and 0.22?f rated at 100V DC. Desired value selectable through a rotary selector switch with positive click stops.
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SET OF LOGIC GATE MODULES Two input Ex-NOR Gate (0462)
Logic Gate is a digital electronic circuit that follows certain logical relationships between the input and output voltages and finds utility in the execution of basic operations of Boolean algebra. These gates have IC based design with HI/ LOW output states indicated by different coloured LEOs. Housed in a sturdy sheet metal box with rubber feet. all modules have truth tables along with necessary details clearly printed on top. Input and output through 4mm sockets in different colours for easy identification. Input of 5V DC can be connected via input sockets.
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POTENTIOMETER, CALIBRATED, 10kΩ (0463)
A wire wound potentiometer rated at 3W is fitted inside a moulded plastic casing with a knob at the top for varying the resistance. Three 4mm sockets mounted at the top provides potential dividing arrangement as well. Calibration clearly printed on the cover plate along side knob.
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FULL WAVE RECTIFIER (0464)
Demonstarates the working of a full wave rectifier and the principal involved. Comprising of rectification circuit using four silicon diodes, internally connected in bridge pattern.
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n-p-n TRANSISTOR (0465)
Comprises an n-p-n junction bipolar transistor mounted in the plastic casing. useful for studying the transistor characteristics and its functioning in different circuits.
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p-n-p TRANSISTOR (0466)
Comprises a p-n-p junction bipolar transistor mounted in the plastic casing. useful for studying the transistor characteristics and its functioning in different circuits.
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