Hi people,
I received a Tektronix dmm916 recently from my cousin, he said the multimeter was stored in his basement for a couple of years and he received it from his friend and he thought it should be fine and just need a new battery and maybe calibration...
Hi gave it to me and I installed a new battery and test the different functionality. all the ranges look fine except the ohm range and diode test.
in the Ohm test the multimeter showing around 10k ohm without anything connected to the leads... and diode test showing 1.6 Volt open circuit... the open circuit numbers changing slowly in time and I thought it might be a bad capacitor, so I removed the SMD capacitors and test them outside the board, they tested okay.
when I remove the battery and leave the selector in Ohm range, the front end reads around 12K Ohms (when I connect another multimeter into dmm916 Frontend) that made me think maybe some of those protection components gone bad but the Volt and other ranges showing large resistance, so it shouldn't be the frontend.
I like to repair the multimeter if it possible as I really like the feel and it looks and it is the best multimeter I ever owned. also, don't mind to sending it to get repair by professionals(I'm leaving in Sydney, AU) but I doubted if it worth to do that as they sell on eBay under $200.
wondering if anyone here knows if the schematics are available for this model or similar ones. also, if anyone has experience regarding repairing or calibrating this device or similar models. Any advice appreciated. please let me know what you think regarding the whole situation
PS: Please excuse my ignorance regarding technicals and language! as I'm a none-English speaker and beginner hobbyist.