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Technical Discussions
Mathias
Mathias
01:18 May-25-2005
ASTM E 1742-00

Can anyone explain why the curve in Figure 2 (Maximum Allowable Film Density) isn’t continous? There is a jump between density 2.5 and 3.0 – why?



    
 
 Reply 
 
DJ Kallhof
DJ Kallhof
04:25 May-31-2005
Re: ASTM E 1742-00
I believe they are attempting to illustrate the difference between the larger "low range " viewer and the smaller "high intensity" viewer. This is just a way to document and justify the maximum readable film density posted on each viewer. What I find interesting is the fact we can no longer measure the light intensity in foot candles. According to ASTM E 1742-05 we must now measure luminance in candelas/m squared. Again, the cost of NDT goes up. Yee Ha
----------- Start Original Message -----------
: Can anyone explain why the curve in Figure 2 (Maximum Allowable Film Density) isn’t continous? There is a jump between density 2.5 and 3.0 – why?
:
------------ End Original Message ------------




    
 
 Reply 
 
Mathias
Mathias
05:17 Jun-01-2005
Re: ASTM E 1742-00
Thank you for the answer Mr Kallhof. But what still makes me confused is the fact that if you now measure 10000 lux at the viewing port, can you post a 3.0 sticker on the viewer or is the maximum readable density just 2.5?
----------- Start Original Message -----------
: I believe they are attempting to illustrate the difference between the larger "low range " viewer and the smaller "high intensity" viewer. This is just a way to document and justify the maximum readable film density posted on each viewer. What I find interesting is the fact we can no longer measure the light intensity in foot candles. According to ASTM E 1742-05 we must now measure luminance in candelas/m squared. Again, the cost of NDT goes up. Yee Ha
: : Can anyone explain why the curve in Figure 2 (Maximum Allowable Film Density) isn’t continous? There is a jump between density 2.5 and 3.0 – why?
: :
------------ End Original Message ------------




    
 
 Reply 
 
DJ Kallhof
DJ Kallhof
09:27 Jun-03-2005
Re: ASTM E 1742-00
Unfortunately I'm in the dark over this revision as much as yourself. I am waiting for a response from ASTM subcommittee E07.01 to my inquiry regarding the posting of "Maximum Allowable Film Density" and how to come up with a value.


----------- Start Original Message -----------
: Thank you for the answer Mr Kallhof. But what still makes me confused is the fact that if you now measure 10000 lux at the viewing port, can you post a 3.0 sticker on the viewer or is the maximum readable density just 2.5?
: : I believe they are attempting to illustrate the difference between the larger "low range " viewer and the smaller "high intensity" viewer. This is just a way to document and justify the maximum readable film density posted on each viewer. What I find interesting is the fact we can no longer measure the light intensity in foot candles. According to ASTM E 1742-05 we must now measure luminance in candelas/m squared. Again, the cost of NDT goes up. Yee Ha
: : : Can anyone explain why the curve in Figure 2 (Maximum Allowable Film Density) isn’t continous? There is a jump between density 2.5 and 3.0 – why?
: : :
------------ End Original Message ------------




    
 
 Reply 
 

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