I never saw the original message because, apparently, it was off-topic posted in one of the noisy threads I was deleting. But anyway...

From the similar GPS 58503B manual:

:DIAGnostic:LIFetime:COUNt? RESPONSE
Returns the lifetime count, indicating the total powered-on time.
Range of the integer is 0 to 4,294,967,296 with a resolution of 1. Each count
represents three hours of operation.

If I did the math right, that allows for about 490,000 years. Probably a bit more than necessary.

The OP said,
"started at life time 13917 and after 145Hrs it shows 13965"
So that would be 13965 - 13917 = 48   x3 = 144 hrs

13965 x 3 = 41860 or about 4 3/4 years of on time.



On 11/3/2010 5:58 PM, Bob Camp wrote:
Hi

It is in odd units. It's also sort of a meaningless number. There is no obvious 
wear out mechanism in a Z3801. If anything they should get better the longer 
they are on power.

Bob


On Nov 3, 2010, at 8:22 PM, erniepe...@aol.com wrote:

Hi Time nuts,

Just recently started my Z3801 in my new location and noticed the following 
discrepancy....

The unit is running more then 145 Hrs from the new start up.....and the "life time" 
display from the starting time just shows 48 " digit" more time......in other words:
started at life time 13917 and after 145Hrs it shows 13965......
what is the meaning of the "life time" display  / windows/.....

Please advise.

Many thanks ,
Ernie.




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