Products > Test Equipment
Just got a Tek 2465A, couple questions (how I screwed the calibration data)!!
alpher:
Hi, just got the 2465A CT in rackmount adapter quite cheaply . :)
Unit works, I;m reluctant to do much with it before changing the battery backup for the RAM chip, affraid to lose the calibration data.
I;m I right though? The dreadded test 4 fail on 2465B does it applies to 2465A as well?
Looking breiefly through service manual looks like the auto calibration procedure may
"populate" the RAM with the correct values somehow?
Anyway as I said so far there are no startup errors displayed, I measured the battery voltage to be a healthy 3.5+ V on cr2770.
Should I be worried and replace the battery first (date code from 87) ?
Also since it came in rackmount adapter I'm missing the handle, looks though that to get the handle I may have to get a donor scope, hoped that maybe handle from my TDS340 will somehow fit, but 2465 is ~2" narrower :(
So any one knows if other series (beside 24xx) will fit?
Maybe 22xx?
Thanks.
z01z:
The battery backs up the SRAM holding the calibration constants, so yes, you can get those errors if the battery is depleted.
The tricky part with this kind of battery is that you cannot really know how much juice is left, according to the datasheet the output voltage is flat then it drops suddenly.
alpher:
So you're sayi'n that the RAM data is "unrecovearable", so to speak ?
Also, I removed the cooling fan to lubricate the bearing as it was pretty noisy.
Just to make sure, the fan should suck the air out of the case?
Thanks.
linux-works:
using this thread to ask about my own 2465a, as well (hope its ok).
I bought a new battery for the cal data ram board; I have not opened the scope yet and the scope seems to work right now, so I assume the cal data is still intact.
just checking before I start, to make sure I understand fully: is it true that I don't need to keep the scope plugged in, power on, while doing the work on this board for the battery swap?
I've read about avoiding grounded soldering irons and all that - but my plan is to remove the board from the powered-down scope, have the board sit on my workbench, tack wire some temp connections to a holding battery of some kind, clip out the old battery and solder the new one in its place.
if the board is NOT grounded at all, just floating - and sitting on my bench - there's no need to worry about having a grounded soldering iron, right? I can't see any reason to worry as long as I don't short the battery while I'm doing the work.
I've also read about people using a small series R on the new battery so that it will limit how much current it might push out (if the old one is low-z; but I'm not sure an old battery would be low-z anymore!). is this being overly cautious? same about a series anti-backfeed diode. so I really need to worry about such things, given that the swap will take a minute or less, with the other battery in parallel?
before I start, wanted to be fully sure so that I don't make any mistakes.
tautech:
I don't get it. :-//
What's wrong with this thread:
https://www.eevblog.com/forum/testgear/tektronix-2465b-oscilloscope-teardown/
You'll each get a wider audience that can assist you with these great scopes.
Is the A really that much different ?
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