Diode Tester Limits Reverse Voltage And Forward Current To Protect Sensitive Junctions

摘要

Some diode manufacturers caution against using therndiode tester function in ohmmeters because it could exceed the reverse-voltage and forward-current ratings of sensitive diodes. This is especially true in optical devices such as photodiodes and laser diodes.rnHowever, the circuit described here performs a simple goo-go test on these diodes while limiting forward current and reverse voltage to safe levels (see the figure). Designers can tailor the circuit for different reverse voltages or forward-current levels.