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UJT Characteristics Apparatus

Product Code : SCL-PLE-11842

Quick Answer: The UJT Characteristics Apparatus is used to plot the emitter characteristic of a unijunction transistor and find its intrinsic standoff ratio, with a 0–15 V inter-base supply, a 0–10 V emitter supply and three built-in meters.

Last updated: 18 October 2026

Key Features

  • Shows the negative-resistance region of a unijunction transistor.
  • Independent DC supplies: VBB of 0–15 V and VEE of 0–10 V.
  • Meters for emitter voltage, emitter current and base-to-base voltage.
  • Emitter current read on a 0–50 mA scale.
  • Mimic diagram with 4 mm safety-shrouded sockets.

Technical Specifications

SpecificationValue
DeviceUnijunction transistor (UJT)
Inter-base supply (VBB)0–15 V DC
Emitter supply (VEE)0–10 V DC
Meters3 (emitter V, emitter I, base-to-base V)
Ammeter range0–50 mA (emitter current)
Voltmeter ranges0–10 V (emitter), 0–15 V (inter-base)
ControlsVariable potentiometers for emitter bias and inter-base voltage

How It Is Used

The inter-base voltage is set and held while the emitter voltage is raised slowly and emitter current recorded. The emitter voltage climbs to a peak and then falls as the current increases, marking the negative-resistance region, and the readings are used to determine the intrinsic standoff ratio (η).

Frequently Asked Questions

What is the negative-resistance region seen with the UJT Characteristics Apparatus?

It is the part of the emitter characteristic where emitter voltage falls while emitter current rises, the property that makes the UJT useful in relaxation oscillators and timing circuits.

Related Physics Lab Equipment

See the full physics lab equipment range, or these related semiconductor characteristics apparatus:

For a quotation on the UJT Characteristics Apparatus, contact JLab India on +91-8569909696.

   
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