Physics & Chemistry Research Instruments

Product Details:

Wide range Decade boxes for product design or calibration checksHeavy duty durable constructionSeperate grounding terminalThree binding posts permit isolated substitutions1% Resistance substitution from 1 to 11,111,110½Seven Decade Ranges of ResistanceValues can be changed in 1½ increments0.3W resistors0.3½ internal zero resistance

Product Details:

Features:

• Useful for measuring Low Resistance values
• Range 0.001 to 11.1MΩ
• Accuracy ± 0.05%
• In-built 4.5V dry battery
• Best Quality Manganin Wire is used for coils
• In-built high sensitive galvanometer of 20uA/mm
• Suitable for Murray Varlex Loop Test
• Optional Light Spot Galvanometer can also be supplied

Product Details:

Suitable for the use of wires and cable preparers and Transformer industry

Extensively used for fi nding the resistance of transformer winding, contact
resistance of relays etc.

Measures in the range of 0.2 Micro ohms to 11 Ohms

Measurement Ranges 2 Milli Ω to 11Ω, 0.2Milli Ω to 1.1Ω, 20 Micro Ω to
 11Ω, 2 Micro Ω to 0.11Ω and 0.2 Micro Ω to 0.0011Ω

Max Current 10A intermittent and 5A continuous

Accuracy ± 0.05%

Battery Reversing Switch provided to reverse the current in the bridge to eliminate
thermal effect

Complete with Spot Refl ecting Galvanometer, Heavy Duty DC Current Source,

Conductivity Attachment

Product Details:

For Determination Of• Young’s Modulus,• Ultrasonic Frequency Velocity

Non-Destructive Testing of Material is an important part of Engineering Education as it gives information without deformation in the shape and size of the material. One of the NDT techniques, Piezoelectric Technique is widely used for the measurement of composition dependent properties such as ultrasonic velocity, compressibility, elastic constant, Young’s modulus and Bulk modulus. Its suitability for metals, plastics, polymers and crystals etc makes it versatile tool for Engineering Physics, Material Science and Polymer Science. This low cost NDT apparatus is being used in several I.I.T.s/Universities/Engineering Colleges for laboratory experiments and Research work. 

In this technique the specimen is cemented to a quartz rod of identical cross section and resonant frequency (fc) of the composite system is determined using the apparatus. The resonant frequency of the quartz rod (fq) is also determined. From the knowledge of (f_q), (f_c) and the masses of the quartz (m_q) and the specimen (m_s), the resonant frequency of the specimen fs is evaluated using the relation 

ƒ_S =ƒ_C  + m_q/m_{c   (} ƒ_c-ƒ_q)

Using the value of ƒ_S  , the length of the specimen (L) and the density of the specimen, the velocity of the ultrasonic waves in the specimen (v ) and compressibility (β_ad) can be calculated using relations 

V=2. ƒ_{S .} L
βad=1/P.V² 

where P is density of specimen . 

Young's Modulus of specimen is calculated using relation 

r=4. ƒ_S. L².P

INSTRUMENT: It consists of Piezoelectric Oscillator, power supply, quartz rod, holder, quartz rod with sample, connecting cables and R.F. meter.ACCESSORY: Any general purpose C.R.O.(not supplied with the instrument).