Quick Answer: The Digital PN Junction Diode Apparatus maps the forward and reverse bias V-I characteristics of a PN junction diode on separate circuits. Its stabilised DC supply is continuously variable over 0-3V and 0-30V ranges, with readings on dual 3.5-digit displays.
Last updated: October 2026
Key Features
Separate circuits for forward and reverse bias tests
Stabilised, continuously variable DC supply with 0-3V and 0-30V ranges
Dual 3.5-digit displays show voltage and current together
Digital meters avoid the parallax error of analog movements
Circuit schematic printed on the panel
Technical Specifications
Specification
Value
Circuits
Separate forward and reverse bias circuits
Supply
Stabilised DC, continuously variable, 0-3V and 0-30V
Displays
Dual 3.5-digit, voltage and current
Ammeter
Multi-range digital
About This Product
Students step the bias voltage and read voltage and current together to plot both regions of the diode curve. The digital readings help them pick out the cut-in (knee) voltage in forward bias and the small leakage current in reverse bias.
Frequently Asked Questions
Does the Digital PN Junction Diode Apparatus test both bias directions?
Yes. It has separate circuits for forward and reverse bias, with a supply variable over 0-3V and 0-30V ranges.
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