Ra Instruments - Electrical & Electronic Testing Devices

We are offering kelvin cum wheatstone bridges. description:- rai precision kelvin-cum-wheatstone bridges model 55x-kw is important instruments in the measurement of resistance as low as 0.1 micro ohms to highest value of 1 ohm. Manganin has the quality of very low temperature co-efficient which is a critical parameter for resistance standards manufacturing. Kelvin cum wheatstone bridge is also constructed with manganin coils & sheet. Phosphor bronze silver plated switches have been used to minimize the residual resistance error. Four standard decade dials, ratio selector & plug keys facilitate accurate null detection. kelvin bridge section user can easily change over from kelvin section to wheatsone bridge section & vice-a-versa with the help of a selector switch. range of measurement 0.1 micro-ohm to 1 ohmaccuracy below 0.0001 ohm +- 0.5% +- 1 slide wire division0.0001 ohm to 0.01ohm +- 0.1% above 0.01 ohm +- 0.05% reference resistance standards 0.001, 0.01, 0.1 and 1.0 ohmdividing ratio 1 , 10 , 100 and 1000 ohmmultiplying ratio 0.1 x 1, 1.0 x10, 10 x10 and 100 x10 ohm in shape of standard decade resistors. wheatstone bridge section range 1ohm to 1.0 megohmaccuracy 1 ohm to 100.0 k 0.1 % +- 1 step of lowest decade dialabove 100.0 k 1.0 % dividing and multiplying ratio in denominations of 1, 10, 100 and 1000 ohm variable arm formulated by decade dials of 10x0.1, 10x 1, 10 x10 and 10 x 100 ohm. accessories for kelvin-cum-wheatstone following accessories are required with the kelvin-cum-wheatstones support accessories to complete the measurement system. The bridge becomes the complete measurement system in conjunction with the following accessories: 1. conductivity attachment2. high amperage dc source ( 0 to 50amp. Suitable for bridge)3. spot reflecting galvanometer4. analogue galvanometer with selector switch for protection of spot reflecting galvanometer5. current reversing switch