Vibrations & Waves

Battery operated LED plastic strobe with speed control and on/off button. Made from robust plastic with hanging bracket. Flashes up to times per second. Requires 4x AA batteries. Dimensions (WxHxD): 82 x 50 x 140 mm.

This superb, robustly built mini digital sound level meter has a wide dynamic range and gives virtually instant readings. It is ideal for quick and easy sound level checks. • Single Measurement Range: 30 to 130 dB • Temperature Range: -20 to +70 °C • 0.1 dB Resolution • Fast 125 ms, or Slow 1 s time response weighting • Precision ½ inch electret condenser microphone • Lmax (LAFmax, LASmax) • Lmin (LAFMin LASmin) • 30 mm Colour backlight LCD display with function indicators • Display updates every 300 ms • Data hold displays highest or lowest measured valve • Low battery indicator and auto power off after 15 minutes of no activity (can be user disabled) • Supplied with wind muffler and batteries (3 x AAA) • Dimensions: 144 x 56 x 31 mm, Weight: 73 g

The SDS5032E is a general purpose 2 channel digital oscilloscope with large 200 mm colour display, making it ideal for education and industrial environments. Complete with USB output to PC. Specifications and Features: • Bandwidth: 30 MHz • Sample Rate (real time): 250 MSa/s (125 MSa/s per channel) • Memory depth: 10 KB • Maths functions: Add, subtract, multiply, division and FFT • 20 automatic measurements • Auto-scale function • Standard interface: USB, USB flash drive, LAN, VGA • Bandwidth: 30 MHz • Waveform storage: 15 waveforms • Vertical Sensitivity: 5 mV/div~10 V/div (at input) • Vertical resolution: 8 bit • Trigger Type: Edge, Pulse, Video, Slope • Trigger Mode: Auto, Normal, Single

Flat section steel wire in helical coil. Diameter 75 mm.

Flat section steel wire in helical coil. Diameter 75 mm.

Designed by Timstar in response to customer enquiries, the Rubens' Tube provides a memorable demonstration of standing waves. The Rubens' Tube consists of a 10 cm diameter aluminium tube with row of small holes drilled along the top, and a 15 W loudspeaker mounted at one end, and is supplied with instructions. Natural gas or LPG can be used, with a length of burner tubing to connect it to the supply. The speaker can be driven directly using signal generator with power output, but Rubens' Tube Driver (SO180900) is recommended for best effect.

Useful set of accessories for use with the microwave apparatus, including the following, mounted on feet for free standing: • Aluminium plates, 200 mm x280 mm • Aluminium plate, 60 mm x280 mm • Perspex plate, 200 mm x280 mm • Polarization grille, 200 mm 200 mm

This battery operated microwave probe detector allows the student to measure, plot and investigate the microwave field intensity. The probe is slightly less sensitive than the normal receiver, and is largely non-directional. The unit benefits from built in amplifier with variable gain and meter displaying the relative signal strength.Output can be taken via the BNC connector either to an oscilloscope or meter. The probe detector is compatible with most 2.8 cm microwave educational systems on the market. • 2.8 cm microwave probe receiver • Mobile, easy to use, battery operated • Built in illuminated signal strength meter • BNC terminated output for use with oscilloscope, meter or audio amp • Gain control • Non-directional

This apparatus is designed for demonstration of standing waves and for determination of the wavelengths of sound waves in air. The tube is supplied with a millimetre scale and moveable piston for changing the length of the air column. (You will also need an external sound source e.g. 1 kHz tuning fork.) Dimensions (L x Dia.): 660 x 300 mm.

This apparatus is ideal for all resonance investigations in air columns particularly the Salters MUS Activity 9. The main tube takes high power sound wave generator unit plugged in to one end. The generator is driven by a standard laboratory signal generator and as the frequency is adjusted the various resonance modes are detected by increased loudness of the note. The open pipe can be studied or a variable length closed pipe can be used by inserting the piston assembly provided. By using a higher amplitude on the generator, Kundt's tube investigations can be undertaken. Fine cork or polystyrene dust is distributed throughout the tube and at resonance the powder gathers at the nodes. Wavelengths can be easily measured. To get a good response a closed tube is preferable, to reduce the sound levels in the laboratory while producing a measurable effect. The apparatus comes complete with two supports for the tube, sound wave generator, resonance tube, closing bung and full instructions. Dimensions (L x Dia.): 1 metre x 50 mm.

An overhead projector type ripple tank for demonstration of various wave phenomena, including reflection, refraction, diffraction, and interference. The unit comprises a shallow 40 x 40 cm tank with a scratch-resistant acrylic window on the bottom, supported by four adjustable legs. Two arms on the side hold an eccentric motor and bar assembly, onto which either two point dippers, or a plane-wave dipper can be attached. The motor and bar assembly is suspended by springs so the vibration is not transmitted to the tank. A bright point light source is held overhead, which shines down through the water in the tank, and casts a shadow of the waves on the bench below. The following accessories are included: Concave, convex, rectangular Perspex plates; curved reflector; two large one small barriers; two point dippers; hand stroboscope; banana leads; instructions. The motor requires continuously variable 0-5 V DC power supply, and the lamp requires 12 V AC supply. Alternatively, the ripple tank can be driven by the SO180324 ripple tank LED driver.

This driver and LED lamp is designed for the classic overhead projection type ripple tank. It features variable DC output for the motor, and another output for the LED. Electronics in the unit measure the oscillation of the unbalanced motor to calculate the frequency of the waves it generates, and can therefore modulate the LED to freeze or slow down the waves without the need of stroboscope. The LED can be set to: • ON where it is on constantly • FREEZE where the frequency matches the waves • CUSTOM the strobe frequency is controlled independently, allowing the waves to appear to move slowly or even in reverse! Compatible with ripple tanks SO58320, SO180320, and most similar ripple tanks from other suppliers. An exclusive product developed by Timstar in partnership with IPC Electronics, designed and manufactured in the UK.

Designed by Timstar in response to customer enquiries, the Rubens' Tube provides a memorable demonstration of standing waves. The Rubens' Tube consists of a 10 cm diameter aluminium tube with row of small holes drilled along the top, and a 15 W loudspeaker mounted at one end, and is supplied with instructions. Natural gas or LPG can be used, with a length of burner tubing to connect it to the supply. The speaker can be driven directly using signal generator with power output, but Rubens' Tube Driver (SO180900) is recommended for best effect.

This unit can be used to drive the Rubens' Tube with an audio source, such as an MP3 player, or device with signal generator app. It features a 3.5 mm socket for an input, and includes a lead to connect it to a signal source, such as the headphone output of mobile phone or laptop. A stereo signal is converted to mono so both channels can be heard on the Rubens' Tube. Output is via pair of 4 mm sockets, for connection directly the Rubens' Tube speaker. It is powered by plug-top power supply.

A compact loudspeaker unit fitted with 10 watt, 8Ω driver. Connection is via colour coded 4 mm sockets. Fitted into durable ABS case.

This speaker is well suited to laboratory demonstrations using sound. It comprises 10 W RMS (20 W PMPO) 8 Ω impedance speaker in robust beech wood and acrylic frame, with 4 mm sockets mounted on the front. The design means that the loudspeaker can be used in either a vertical or horizontal position. Speaker diameter: 125 mm. Dimensions: 225 x 175 x 100 mm.

The small size of this microphone makes it ideal for experiments with sound interference. Other typical applications are measurement of sound frequencies, speed of sound experiments and the recording of sound by data loggers. The microphone is supplied with a one metre cable which connects directly to the electronic counter TI68730 or timer FO140110. It can be connected to an oscilloscope or other measuring instruments via power supply HE110105. Supplied with 10 mm diameter support rod. Dimensions (L x Dia.): 105 x 30 mm.

A hollow wooden sounding box with scales divided in mm between fixed bridges over which three wires are stretched. To one wire, spring balance reading to 100 x5 N is fitted and the tension exerted and measured can be finely adjusted by a wing-nut. Another wire passes over a pulley and can be loaded as desired. A third wire is provided for comparison, its tension may be adjusted by means of a wrest-pin The distance between the fixed bridges is 72 cm. Complete with three movable bridges, wrest-pin key and a set of steel wires, length 1.5 m of 22, 24, and 26 SWG. The pack of replacement wires, sold separately, has steel and brass wires, each in 22, 24, and 26 SWG. Dimensions (L x W x H): 129 x 13 x 11 cm.

An improved version of the classic Bell in Jar experiment. The base is fitted with rubber sheet which ensures a good seal between the jar and pump plate, without the need for vacuum grease. The pump plate is lightweight aluminium, mounted on a heavy tripod base, with a tube connection to the central pillar to evacuate air from the bell jar on top. A stopcock allows the chamber to be sealed, allowing the vacuum to be kept when turning off the pump. The bell jar is robust acrylic which is safe in the event of implosion, and has flat flange to ensure good seal with the pump plate. The bell is suspended by wires to reduce conduction of sound to the bell jar. Connection is by 4 mm sockets on the top bung. The bell can be heard getting quieter as the air is evacuated. Then, by closing the tap, turning off and disconnecting the pump, and then slowly allowing the air back in, the bell can be heard getting louder, as air is required to conduct the sound. The high-quality bell operates on 4-6 V DC or AC. Requires suitable vacuum pump, and heavy-walled vacuum/pressure tubing. Dimensions: Bell Jar • Height 260 mm to neck • Internal diameter 140 mm • External diameter flange 180 mm Pump Plate • Height 195 mm • Diameter 250 mm

Pump plate for SO180500.

Bell jar for SO180500.

An effective and compact alternative to the traditional Bell in a Jar apparatus. Comprising a strong acrylic vessel, with a simple buzzer circuit. The vessel has an outlet through which air can be evacuated using a vacuum pump (not included). The buzzer is mounted on foam to reduce transmission of sound to the vessel walls. When the air is evacuated, the sound of the buzzer is attenuated, as there is no air through which the sound is transmitted to the walls of the vessel. Dimensions (H x dia): 140 x 100 mm

For use with a standard bell jar for demonstration experiments involving low pressure. The plate is made of PVC and has a vacuum connection fitting with valve and thumb screw for the return air. Two standard 4 mm jack connectors are provided with 4 mm jack connectors available inside the jar. Tube Dimensions (Dia.): 10 mm. Plate Dimensions (Dia.): 210 mm. • For use with 150 mm diameter bell jars only

A crystal microphone giving 10-20 mV output without batteries. Used for displaying students' voices on sensitive oscilloscope, or for speed of sound experiments. Fitted with mm colour coded sockets. • Frequency range: 100-10,000 Hz • Impedance: 200 Ω • Sensitivity: mV/Pa/kHz

This 4W, 8 Ohm Mylar-cone loudspeaker comes mounted on an acrylic base, so that it can be used either vertically or horizontally. The front of the speaker has a hard protective cover with drilled holes. Dimensions (Speaker Dia.): 60 mm. Overall Dimensions (H x W x D): 120 x 90 x 40 mm.

This Sonometer pickup contains a single guitar-type magnetic pickup. When placed under a moving steel wire, such as on Sonometer, an emf is induced in the pickup which can be displayed on an oscilloscope. Period, frequency and amplitude measurements can then be taken from the oscilloscope screen. The whole unit, constructed in clear acrylic, measures approximately 90 x 40 x 20 mm and comes with integral 4 mm sockets and instructions for use.

Aluminium. Boxed set of 8. Range C.256 Hz to C512 Hz.

This digital xenon stroboscope is a lightweight, sturdy and compact instrument which features digital, variable flashing rate adjustment and external triggering facility. The bright xenon tube makes it ideal for educational uses such as wave, motion and vibration experiments. Supplied with a mains lead. Specifications: 60 to 18,000 rpm, to 300 Hz, External triggering signal, Power supply: 240 V AC, 50 Hz. Dimensions (L x H x W): 215 x 140 x 150 mm.

A generator for producing mechanical vibrations when used with function generator. The input is fed to coil which is mounted within the field of cylindrical permanent magnet. The unit is fuse protected. Locking mechanism protects from shock during transit and when changing accessories. Max input 6V/1A. Dimensions (L x W x H): 100 x 100 x 120 mm.

For use with SI30825 for demonstrating the relationship between frequency and the number of vibrational nodes. Dimensions (Dia.): 290mm.

For use with SI30825. A thin layer of sand is spread over the plate and resonance patterns (""Chladni"" figures) can be observed at certain frequencies. The plate resonances are audible.

For use with SI30825. A thin layer of sand is spread over the plate and resonance patterns (""Chladni"" figures) can be observed at certain frequencies. The plate resonances are audible.

Steel strips giving six vibrating lengths. For use with SI30825. Fundamental frequencies at 11, 15, 21, 36 and 50 Hz can be readily observed. Interesting standing waves can be seen up to 300 Hz and heard up to 900 Hz.

For use with SI30825. For demonstrating standing waves. Dimensions (L): 2 metres.

This quality spring is ideal for producing longitudinal waves with vibration generator connected to a signal generator. Spring constant 4.7 N/m. Closed Dimensions (L x Dia.): 155 x 27 mm.

This vibration generator is a sturdy, user-friendly tool for providing electronically controlled waves. Ripples can be created for the study of wave motion. (Recommended for use with square wave generator). Dimensions: 140 mm, overall diameter: 114 mm. The amplitude is +/- 3 mm.

This wave machine, which comes in kit form and must be self-assembled, is designed to demonstrate the theory of waves. The kit comprises: transverse wave machine with 80 arms spaced on nylon line with detachable weights to provide an example of transverse wave propagation in which movements of the rods create the waves; Two loaded elastic cords to illustrate transverse wave motion; An extension spring with weights, for the propagation of both longitudinal and transverse waves; teacher's book which describes the experiments and gives detailed quantitative analysis.

A Slinky-type spring for wave demonstration, with a wooden storage stand. Stand helps protect the spring in storage and keep it in good condition. Closed Spring Dimensions (Dia. x L): 72 x 220 mm. Base Dimensions (L x W x H): 150 x 150 x 355 mm.

To demonstrate form and propagation of longitudinal and transverse waves. This simple wave demonstrator rotates a set of cams that raise and lower 24 vertical rods with plastic highlighted tips for easy viewing. It is 480 mm long, strong, and almost silent in operation. Lubrication is not required and students can see from both sides. Eight of the rods are turned at 90 degrees to simulate transverse wave motion. The handle is fitted with a circular scale marked in degrees of rotation.

Flat section steel wire in helical coil.

This multi-purpose microphone has been designed for a number of applications and experiments requiring the use and demonstration of audio input, including voice and music waveforms. The electret condenser type microphone is mounted in a moulded plastic box with two standard 4 mm output connectors, an on/off switch and a power indicator. • Electrical Supply: 9V PP3 battery (supplied) • Dimensions: 68 x 120 x 36 mm • Mass: 0.15 kg • Sensitivity: -42 db • Frequency Response: 20 Hz to 20 kHz • Output Impedance: 2.2 kohm

This PicoScope is extremely versatile, with an Oscilloscope, spectrum analyser and arbitrary waveform generator. Its compact size makes it extremely portable and the case is very robust. Connections are simple, comprising, channel A, channel B, signal out and USB socket. Dimensions (L x W x H): 100 x 135 x 45 mm. The USB (2.0) provides power, eliminating the need for an external power supply. The USB connection facilitates high speed data transmission. The Windows software supplied with each PicoScope is very simple to use. It features an auto setup function which reduces setup time to few minutes. Updates to the software are provided free of charge. It has an input range of: ±50 mV, ±100 mV, ±500 mV, ±1 V, ±2 V, ±5 V, ±10 ±20 V. Specification: Model: Picoscope 2204 • Bandwith (MHz): 10 • ETS (GS/s): 5.0 • Sampling rate (MS/s): 100 • Scale (ns-s/div): 2-50 Signal Generator Output: • Buffer Size: 4k words • Vertical Resolution: 8 bits • Output Range: ±125 mV to ±2 pk-pk with ±1 offset • Output Resistance: 600 Ω • Clock Frequency: 2 MHz • Bandwidth: DC to 1 MHz

This PicoScope is extremely versatile, with an Oscilloscope, spectrum analyser and arbitrary waveform generator. Its compact size makes it extremely portable and the case is very robust. Connections are simple, comprising, channel A, channel B, signal out and USB socket. Dimensions (L x W x H): 100 x 135 x 45 mm. The USB (2.0) provides power, eliminating the need for an external power supply. The USB connection facilitates high speed data transmission. The Windows software supplied with each PicoScope is very simple to use. It features an auto setup function which reduces setup time to few minutes. Updates to the software are provided free of charge. It has an input range of: ±50 mV, ±100 mV, ±500 mV, ±1 V, ±2 V, ±5 V, ±10 ±20 V. Specification: Model: Picoscope 2205 • Bandwith (MHz): 20 • ETS (GS/s): 10.0 • Sampling rate (MS/s): 200 • Scale (ns-s/div): 1-50 Signal Generator Output: • Buffer Size: 4k words • Vertical Resolution: 8 bits • Output Range: ±125 mV to ±2 pk-pk with ±1 offset • Output Resistance: 600 Ω • Clock Frequency: 2 MHz • Bandwidth: DC to 1 MHz

A digital storage oscilloscope, designed with simplicity in mind. The vast array of advanced measuring options found in most digital oscilloscopes is mostly omitted, leaving only the essential features required in schools. This means the unit is very accessible for students and teachers alike. • 7"" colour screen (800 600) • 20 MHz Bandwidth • Sample rate: 100 MS/s • Dual channel • Automatic measurement • Dimensions: 301 x 152 x 70 mm

Frederiksen Microphone Psu

This compact unit from Lascells provides an elegant method of demonstrating the wave phenomena of reflection, diffraction, refraction and interference with none of the setting-up problems usually associated with ripple tanks. The concept has been further developed to offer new features and simplicity in this MkIII design. The unit is completely self-contained with the translucent viewing screen hinging away to reveal a 12cm water tank. The tank is removable for ease of use and has an integral multi-faceted beach which virtually eliminates unwanted reflections. Illumination is from a high intensity built-in LED which can be automatically strobed in sync with the waves to give perfectly stationary images, or switched to allow the user independent control of the wave and strobe frequencies giving the impression of wave motion across the viewing screen. The unit is supplied with three robust dippers which can be easily adjusted to suit the depth of water being used. A selection of barriers shapes and lenses are also provided to enable reflection, refraction, diffraction and interference along with the focussing properties of lenses to be demonstrated. All of the accessories can be stored neatly inside the unit when not in use.

This Microwave Transmitter from Lascells utilizes a Schottky diode oscillator module feeding a tuned waveguide and horn to give a directional microwave beam. The beam is modulated with a variable frequency audio signal which can be adjusted by the control on the top panel. Power is from a mains plug-top unit (supplied).

This Lascells Microwave Receiver uses a plate antenna which gives high sensitivity over a broad area. Output is to an internal loudspeaker and power is derived from a mains plug-top unit (supplied). A control allows the user to adjust the sensitivity to cater for different circumstances and distances.

This Lascells Microwave Probe Receiver gives a localised, precision receiver which finds particular application in identifying areas of peak and low amplitude in interference, reflection and refraction experiments. There are two controls, one for sensitivity and the other for volume of output to the internal loudspeaker. Power is from a mains plug-top unit. Output can be monitored by a CRO connected to the 4 mm sockets for quantitative measurements.

This Lascells Microwave Accessory Kit comprises of 2 metal reflection/diffraction plates with base. Acrylic reflection/transmission plate with base 1 narrow metal plate to provide “Young’s Slits”