Recommended textbooks?

Starting an apprenticeship in biomed in 2 weeks. Have a good understanding of the hospital environment and medical terminology as I've worked in sterile processing for 15 years. I have always had an interest in electronics and can understand schematics and a very basic understanding of a multimeter and ohm's law etc etc. Any books that would be helpful. I'm not sure yet what they will be giving me/providing me if anything as that info has not been relaying to me.

Is Grob's book on electronics a good idea?

Grob's Basic Electronics: Schultz, Mitchel E.: 9781259852671: Amazon.com: Books

Introduction to Biomedical Instrumentation

Introduction to Biomedical Instrumentation: The Technology of Patient Care: 9781107185012: Medicine & Health Science Books @ Amazon.com

Or are the best sources going to be product manuals and so forth?