Hello all -
My first post here, and need advice on my first scope which I got a few days ago, tektronix 24xx series, a 2455B. Currently it is fully functional but of course the Keeper battery is dated 1988. First question is (1) should I replace the battery now? It is going to fail soon so I might as well get it over with? On the assumption that I should replace it, here is where I am a little paranoid about losing the cal data. So after researching this here on eevblog I just want to double check to make sure I don't screw up.
Plan is to remove the A5 board, leave the board floating, attach a temporary battery (a 3.6V lithium battery) across P(B) and P(C) (see attached photo), de-solder original Keeper battery (soldering iron tip is grounded through the solder station mains plug) and replace with new Keeper battery. So question (2) - Is this correct approach or should I also connect a diode and 10k current limiting resistor to the temporary battery between P(B) and P(C). Hoping I can just connect the temporary battery straight across P(B) and P(C).
I will have board on ESD mat, mat grounded to power strip gnd, ESD wrist strap grounded to power strip gnd, solder station grounded to power strip gnd through the 3-prong power cord.
I am really paranoid about this because I have read here on the forum where a member basically did this as outlined but still lost his cal data somhow. (I have already recorded my working cal data off the scope through the diagnostics mode). I don't want to lose cal as I don't have any equipment for a re-cal.
Any advice/confirmation is appreciated. Thanks