I'm looking to replace my nearly ten year old memory battery in my E4407B. It hasn't failed yet but I want to replace it before it does - Preferably without causing any harm such as wiping out cal constants, etc. I have a service guide (p/n E4401-90056) which on page 4-15 says "If you wish to replace the battery yourself, refer to the "BT1 Battery" replacement procedure in Chapter 7". Unfortunately the manual only goes to chapter 6. Not sure if a later version of the manual included chapter 7 or not as my manual shows a 1999 print date.
Looks like it will pull right out of a socket and I can put a new one in but I would really like to know if there is anything more to it such as needing to restore anything after the battery is replaced, or if there is a way to do it without memory loss, etc. I already have the replacement part on order but would appreciate any help as to the replacement procedure.
Thanks in advance,
Rich Stolte
AccuSource Electronics
Looks like it will pull right out of a socket and I can put a new one in but I would really like to know if there is anything more to it such as needing to restore anything after the battery is replaced, or if there is a way to do it without memory loss, etc. I already have the replacement part on order but would appreciate any help as to the replacement procedure.
Thanks in advance,
Rich Stolte
AccuSource Electronics
What the manual says in Chapter 7 is to run the Processor Initialization Routine in the field test software, however, you can just do the following instead...
Unlike some of our older instruments, factory alignment data is not stored in the battery backed-up memory in the ESA series. It only contains information that can be easily replaced from the front panel. What you will need to do after replacing the battery is:
Set the time and date
Set the GPIB address, if you aren't using the default of 18 (Baud rate if using RS-232)
Default the Alignment data (System, Alignments, Load Defaults)
Then run the front panel alignments by connecting a short cable between the Cal Out and the RF Input and press System, Alignments, Align Now, All
If you have a printer configured you will also lose those settings, so you might want to check those settings first so that you can reset it afterwards.
That should do it...