Quick Answer: The PN Junction Diode Characteristics Apparatus has two regulated variable DC supplies, 0-3V for forward bias and 0-30V for reverse bias, for plotting diode V-I curves. Its voltmeter reads 0-3V / 0-30V and its ammeter 0-1mA / 0-25mA.
Last updated: October 2026
Key Features
Regulated 0-3V DC supply for forward bias
Regulated 0-30V DC supply for reverse bias
Dual-range analog voltmeter with mirror scale, 0-3V / 0-30V
Dual-range ammeter, 0-1mA / 0-25mA
On-board P-N junction diode
230V AC ±10%, 50Hz mains input; 4mm shrouded patch points
Technical Specifications
Specification
Value
Power input
230V AC ±10%, 50Hz
Forward bias supply
Regulated 0-3V DC, variable
Reverse bias supply
Regulated 0-30V DC, variable
Voltmeter
0-3V / 0-30V DC, analog mirror scale
Ammeter
0-1mA / 0-25mA DC
Terminals
4mm shrouded banana patch points
Operating environment
0°C to 50°C; 10% to 85% RH, non-condensing
About This Product
Using the low-voltage supply, students trace how forward current rises sharply once the cut-in voltage is passed; the higher supply is then used to reverse-bias the diode and observe the small reverse current. The mirror-scale meter helps avoid parallax when taking readings.
Frequently Asked Questions
Why are there two power supplies?
A 0-3V supply is used for forward bias and a 0-30V supply for reverse bias.
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