Blog reader “Dmitri” has sent pictures of a very unique and interesting modification he performed on his recently acquired Fluke 8060A. The LCD was ruined, so he has fashioned a replacement using green SMD LEDs arranged to form 7-segment numerals, with light dissipating film and protective acrylic from a broken iPhone. The mask was cut with a German desktop milling machine. The new display board was connected to the processor sub-board with the same kind of teflon-insulated wire used to connect the LEDs and ballast resistors.
The green LEDs operate on very low current, allowing them to be driven directly from the processor without adding extra driver circuitry. Dmitri reports an average segment current of about 10uA, and the entire unit still only draws 2.3mA from the 9V battery with an all-zero display in VDC mode, 3.8mA in VAC mode.