Hello ,
The information we have for declassification/memory erasure is on tek.com for the AM5030.
https://www.tek.com/en/current-probe-manual/am503-am503a-am503b-am503s-am5030-am5030s-memory-information-and-clearing
Also note the Service manual on tek.com for the AM5030.
https://www.tek.com/en/am503b-manual/am-503b-am-5030-a6300-series-instructions
For the other requested model, we have no formal document on them as they are fairly old products. What I can say about the A6302, is it has no memory devices that could store any data.
The TM5003 was just a power supply main frame for the AM5030 no user accessible memory if any at all.
The TM5000 products were sold to TEGAM www.tegam.com, a long time ago, they may be able help you with declassification information on those products.
Manual on this web site also https://w140.com/tekwiki/wiki/TM5003
