Q: Tenma 72-7760 ( o/c 730-0647), it does not communicate with PC or laptop?
A: Please make sure the correct COM port selected, the IR sensor of the cable must aim at the emitter of the meter, then open the software and click the button 'connect'. if still doesn't work, try to change a cable or PC.
Calibration instructions for Tenma 72-7760 (Farnell o/c 730-0647),see below for file.