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Null Detector – HLSI
The null detector comprises a solid state amplifier having output stage with meter indication.
The instrument is supplied in metal cabinet with Duco paint & aluminium front panel. The said detector has been designed for use with AC bridges While performing the experiment with four arm bridges, bridge oscillators & headphones are required in almost all the four arm bridges. Sometime good quality headphones are not available & also audibility of each student is different from the another. That's why teachers are switching to null detector in place of headphone.