Difference Between Two T.O. procedures for RF Attenuators

Started by Hawaii596, 04-21-2008 -- 14:33:21

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Hawaii596

04-21-2008 -- 14:33:21
I'm doing some procedure / data template work; and as my brain time is limited, thought I'd toss this out to anyone well versed in T.O. procedures.  I'm calibrating stick attenuators (HP 8491A opt 3, 6, 10, 20) to 12.4 GHz.  Without reading through the entire procedure, can someone familiar maybe tell me...

What's the difference between 33K4-4-25-1 and 33K4-4-623-1.  They are both attenuator procedures.  I don't necessarily need the fine technical details; but why do they have two procedures for the same thing?  I'm presuming maybe a former (or present) USAF PMEL type who knows the ins and outs of T.O.'s might know.

Is it for different sets of standards, different lab levels??

I'll try to take a quick look as well.  But wondered if someone knows the generality of why they do that.
"I often say that when you can measure what you are speaking about, and express it in numbers, you know something about it; but when you cannot measure it, when you cannot express it in numbers, your knowledge is of a meagre and unsatisfactory kind."
Lord Kelvin (1824-1907)
from lecture to the Institute of Civil Engineers, 3 May 1883

yonker08

#1
04-24-2008 -- 21:56:38
The 623 procedure has been replaced by the 25.  The only difference is that the 25 has the specs.  for the different attens in the table 1 of AFCAV. 
Make no friendship with an angry man; and with a furious man thou shalt not go: Prov.22:24

davis

#2
04-27-2008 -- 01:50:34
The reason there were originally 2 procedures was because of the number of pages.   When a procedure exceeds a certain number of pages, it incurs extra costs from printing.   To prevent paying the high cost, they merely duplicated the procedure and started adding all new attenuators to 623.   Now that specs are going into AFCAV it should be a non-issue.
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