When we last left this discussion, I had just finished building an optical head for the serial port on my old Fluke 97 Scopemeter using a matched optoelectronic pair consisting of a 3mm IR LED and ...

In this story’s first installment, I described restoring a 12-year-old Fluke 97 Scopemeter to operational status by replacing the instrument’s proprietary NiCd battery pack with four rechargeable NiMH ...