Linearly Variable Differential Transformer (or transducer) is a displacement transducer. This transducer converts mechanical displacement to proportional electric voltage. This experiment is primarily conducted to study the linearity of the transducer for a given displacement in it's operating range. The trainer is provided with a displacement (10mm) transducer. This transducer has a primary wind in and two similar secondary windings. The primary is connected to a SINE wave generator operating at 4Khz. Peak to peak output voltage is approximately 1V AC. Depending on the displacement, a mechanical core moves inside the transducer, permitting linkage of flux lines to it's secondary windings.

An output is available on both secondary windings, depending on the position of the core inside the transducer. A signal conditioner, instrumentation amplifier, gain amplifier, allows a proportional output at its terminals. To study the actual displacement in terms of millimeter, a micrometer jig is supplied. A plot between displacement Vs output is plotted to determine the linearity of the transducer. The same experimental module can also be used with data acquisition instrument to experiment on Data Acquisition techniques.

Specifications:

• LVDT Displacement: 19.99 mm (±10mm)
• Operating frequency: Approximately 4Khz with output of 1V AC RMS nominal
• Built-in power supplies
• Micrometer calibrating jig included
• Output Calibrated in terms of displacement on a 31/2 digit indicator with polarity indicator
• This instrument is assembled in an ergonomically designed cabinet.
• Separate output for connecting to X-Y recorder with 200mV DC FSD (±100mV)
• Operating at 230V AC single phase ±10% at 50Hz
• Working temperature at 43 ±10°C