Products > Test Equipment
HP 856X Battery Backup and Various Memory Questions
Electro Fan:
Here are a bunch of questions, please/thanks:
1. Is it correct that there is a battery for:
a. the Spectrum Analyzer itself
b. the Mass Memory Module
c. the Memory Card that inserts into the Mass Memory Module
I'm pretty sure the answer to a. and c. is yes, but I'm not so sure about b. (the Mass Memory Module).
2. Regarding the battery replacement process for a. the Spectrum Analyzer itself, below is a photo of a SA without the Mass Memory Module in place, and also an image of the battery replacement process from the manual. The manual says there are two screws to be removed - are those the screws that are highlighted with the red circles?
3. What type of battery is needed for the SA itself? (The manual says it's a 1420-0341; is there some other more commonly found equivalent?) Anyone know where this battery can be purchased in the U.S.?
4. Is the battery in the SA itself backing up calibration data? (If this battery dies and the SA is turned off will the calibration be lost? Or are there other scenarios under which the cal data can be lost?) If this battery (in the SA itself) isn't backing up cal data, what is it doing? Where is the cal data being stored?
5. If the battery in the SA itself is backing up cal data what data is being stored in the Memory Module (if any)? Or is all other data (outside the SA itself) being stored resident in the Memory Card? (Is the Mass Memory Module just a housing for the Memory Card or does the Mass Memory Module store some data without a Memory Card?)
6. Can someone please explain the typical/primary intended uses of the Mass Memory Module and the Memory Card? Are there other memory (beyond the cal memory) functions commonly used with the SA which use memory resident within the SA itself (ie, not in the Mass Memory Module and/or Memory Card)?
7. As you can see, I'm unclear (actually very confused) on the overall architecture for memory functions (and backup batteries) on the 856X, and the Mass Memory Module, and the Memory Card; any overview on this would be very welcome and appreciated.
Thanks!
rastro:
Hello EF,
I'm also in the process of replacing batteries in an HP 8566B & HP 8593E. This doesn't directly cross over. However looking at the battery themselves is helpful when searching for a comparable part. In both of my cases these where commercially available batteries - not specialty HP parts.
For reference:
HP 8566B on A15 assembly was made by Tadiran 3.6 Volts, Size AA, TL-5104: Mouser Part: 667-TL5104P (direct replacement)
HP 8593E on Memory board was Panasonic CR-2477: Mouser Part: 614-CR2477NFH-LF (The Renata equivilent is 950mAh vs Panasonic 1000mAh)
Ordering Lithium batteries in the US apparently requires FedX/UPS shipping not USPS for Digikey and Mouser. I found Mouser's shipping charges less than Digikey ~$8.00 vs $14.00.
MarkL:
--- Quote from: rastro on May 13, 2015, 03:11:12 pm ---...
For reference:
HP 8566B on A15 assembly was made by Tadiran 3.6 Volts, Size AA, TL-5104: Mouser Part: 667-TL5104P (direct replacement)
HP 8593E on Memory board was Panasonic CR-2477: Mouser Part: 614-CR2477NFH-LF (The Renata equivilent is 950mAh vs Panasonic 1000mAh)
...
--- End quote ---
When replacing the battery on a 859xx, look at the battery before ordering. The older processor boards have the same battery as the 8566B, the Tadiran TL-5104/P. Picture below.
Electro Fan:
rastro/MarkL, Thanks
These were the batteries in your SA (not inside a Mass Memory Module), right?
Did you change the batteries while the unit was powered on, or did you go for the swap out within 10 minutes of power off?
I realize your SAs are somewhat different than the 856X but do these batteries backup cal data that is stored somewhere within your SAs? Without these batteries would your cal data be lost (if you power the SA down)?
Thanks, EF
MarkL:
I can only speak for the 859x series. I haven't worked on the 8566B.
The batteries in old and new versions of 859x are inside.
On older 859x versions, the battery is soldered directly to the processor board (that's the picture I posted). In newer versions, it's a CR2477/HFN (as rastro mentions) and is soldered to the memory module which is in-turn plugged into the processor board.
In both old and new, there's a supercap that will hold your cal data for up to 8 hours while you change the battery.
But just in case, I highly recommend you go through the "Backing Up and Reloading Correction Constants" section of the Assembly-Level Repair manual. The backup procedure is about 10 minutes of writing down numbers in a chart provided in the manual.
http://www.keysight.com/upload/cmc_upload/All/08590-90316.pdf
Actually, I recommend anyone with a 859x do the backup procedure even if you're not changing your battery anytime soon.
I've changed batteries on several units and it holds the cal data fine. I've also swapped processor boards between units and tried the reloading procedure. That works fine too.
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