Produces an adjustable frequency, amplitude, and duty cycle square wave signal.
Many QDB-2A units are manufactured in China. Check page 2 of the PDF – some include both languages. Otherwise, use Google Translate’s document translation feature. Alternatively, contact the seller for an English supplement. qdb-2a manual pdf
Never attempt to open the QDB-2A case unless the manual explicitly instructs you to. Some internal adjustments require ESD protection. Produces an adjustable frequency, amplitude, and duty cycle