Ludlum measurements 2241 User manual















 !"# #!$%

 !!$&'(('&

)*

 !"# $%& '% (!)

*$"*$

+*$"+*$&,)"-&,)&,"-&,

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2)#56"6+!"

3784248





    

      !         

"

            





#

$

"



 "          

%

         "  

&"













!/%996&%* ) 

 



! 

1. GENERAL.................................................................................................................................1

2. SPECIFICATIONS...................................................................................................................1

3. PRINCIPLE OF OPERATION...............................................................................................2

4. PRELIMINARY INSTRUCTIONS ........................................................................................3

4.1 Unpacking and Repacking..................................................................................................3

5. OPERATING INSTRUCTIONS.............................................................................................3

5.1 Safety Measures ................................................................................................................... 3

5.2 Descriptions of Controls and Functions.............................................................................3

5.2.1 Operator Controls .........................................................................................................3

5.2.2 Main Board (5408-110) .................................................................................................5

5.2.3 Switch Board (5408-052)...............................................................................................5

5.3 Operating Procedures..........................................................................................................8

5.4 Calibration............................................................................................................................9

5.4.1 General Detector Setup Information...........................................................................9

5.4.2 Counts/minute (C/m) Calibration.............................................................................. 10

5.4.3 R/hr Calibration ..........................................................................................................11

5.4.4 Determining CC and DTC.......................................................................................... 11

5.4.5 Detector Overload (OVL) Calibration ......................................................................14

6. THEORY OF OPERATION..................................................................................................15

6.1 Main Board # 5408-110 .....................................................................................................15

6.1.1 Detector Input/Amplifier............................................................................................ 15

6.1.2 Discriminator...............................................................................................................15

6.1.3 Low Voltage Supply ....................................................................................................15

6.1.4 High Voltage Supply....................................................................................................15

6.1.5 Detector Overload........................................................................................................16

6.1.6 Microcontroller (

C)...................................................................................................16

6.1.7 Audio.............................................................................................................................16

6.2 Switch Board (5408-052)...................................................................................................16

6.3 Display Board (5408-091)..................................................................................................16

6.3.1 LCD drive.....................................................................................................................16

6.3.2 Backlight Drive............................................................................................................16

7. MAINTENANCE....................................................................................................................17

!/%996&%* ) 

 



PARTS LIST................................................................................................................................18

Model 2241 Digital Ratemeter................................................................................................18

Main Circuit Board, Drawing 408 X 91 .............................................................................18

Calibration Board, Drawing 408 x 12................................................................................. 19

Display Board, Drawing 408 x 79........................................................................................19

Switch Board, Drawing No. 408 x 45..................................................................................19

Chassis Wiring Diagram, Drawing No. 408 X 103............................................................20

DRAWINGS AND DIAGRAMS................................................................................................22

!/%996&%* ) 

 



 

      



  ! 

 "    

#$

%!&'(")"

&()!   *  $ + ,

  -.//+000 (+&01

      

$  2 " 

-+0001  "!   

 *       

! !*3 3!

  $   "   

    "    

*"$

4

   -+0001  -(+&01

$-+0001

$*

"-+&01&()$

*"-+&+1

   $    

"-+&+1

$5

    3! "

-001$+

$

.   )  (

)(!6

3*777

777*"6&()3

8.98 6  :  *

 6   * * 

   "   

:"$

+     * " 

"*5

"*,$:

"  

* "$    5  

*      

*$

+   *  "

4  77  ;77 *  

*   4 

*  *"   $  



  $  +   

  *  * " *

4$

8)8

$"

   " 

$

 



8)8#6

:",;+ 3!6

"*$

7$<

 

 =

,>"

 

 +:" 77

3

 





/ 





/ 7



(;7



 

  "  

"&()#'

 :";!



&()7$;8 $,!

$7$8 7$;!

* !

: !

 

 +

77$7

???$777

*???*

777???3777???3$



@

7>

*



+

 (!$



*

   $    -/1

/!:

 (!   * $   -/1

 * (  7   

-1*(,7$

! " #$%&#

-/1 /!

   ?? $   

  ;    ($  / )+"

  :    

$



 (      

'%,>$

!/%996&%* ) 

 



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  ( *  *  

 " $;$    

*"     

 

*$  / :A : ( B 

C$;B$;?7>

$=3%

 "    ?7>  

* ,A*!$

'

  <  

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 6     

"$4



???

*???*???3

???3$4

??????$

 

  +4 

77*6*

((

  0:" 4

77;77*6

7$>D777

<6:A;7

+D777<

 

  7$77 

E7:7





   

 )*

 +4  7  ????



+

?8)8"

     ;7  ?77



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  (6 59( F<

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,

G8 %$;!FC,$;8 E$?!@C

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(

 ,$;  $%3!



(

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 "   3



-./01223 

;;,7%7?7

77



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  # 

"*:*

$0:

*

$H

% 

"$



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 $   )

-)=(1! ) .* -.<&1!

)F< -F<1!

  -(+&1 *   

 " 4 

$

     

5       

*"$

=**$!

  5 "  *   

$=

        "  

 5       

$+%"

 -/H9(=.91!     %

   $  

  *    

**$

+,**

5   $  (

"*-/H9(=.91

$

4*

       

*$

+&()*

       

6 ++ .*  .*

6 8 "8    

   -(.H9=91!$  /

7$;8        

7$8

    #   

!/%996&%* ) 

 



*  '*   % !$

 &()  "  *  

'$

"

 -+0001    

"       

'0



4'0



'3

 

'#

$     

"-(+&01$

  '   "  

3        

$-(.H9=91"

  &()    '

       

$.

 -+000(+&01   

3

'$5

+&0  +&+ +&+ "  !

** ! !

:$  +     6

    "     

       

+&0+&+$

5 

5&$-.&/&" $-.&/

*     

 $ *   

$!

3$ = 

         

  !    9!

$9

"$&=

*"

9$

      

*3*

$2*

   $  =  ! 

  !  $  = 

        

 2$.$I$!$







  * '  

"

6 

67 18 #9 #



* F<!

*$+

3""3

$

-.//1     

$

6 #-$1%&#%7%&1%#&"9&-1%&#

6$ 1%%&1%#

'':1-0

+,

 "      

      

$



 +  &()   

 *  !  * 

$

"*

     '*   %

!  :     

 $       &() :

 !A

6*

* 

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     "  -+&+1

-+&01 -./&.@1  -.<0&.+)1

   8 "8 $

-(.H9=91      

$







A   

  *    $

+     " 

88



 $  ) 

-001   3  

   $  ) 

-001       

!/%996&%* ) 

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  "     

"$

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

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$ 

3$!



"$



 .*!A

 -./&.@

;

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:""

     *

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:773

G;>$

+ -./&.@

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  % "   J  *

!-??????1

*$



A  =  

   :   

    : 

$  /    

  -.<0&.+)1 "  

      

:

$*

    " 4  -.<&1

(+&*$

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A  =  

 *    

*$

7$<$



A  =  

      



$

':1-0

3*

"*

$+&+

 -+H) .9.//1    * 

3*$+ "

"-001$

' )#1'%:*  #$%&#  :1-0

+

    



 





$

/*-

;

     (!  *"

  7 $   -

;

  *

   ,7 $     

" 4    

     / (

*$

 /  :    -

;

:

(-

;

  ; 



#1

($

( ) -./01*

  + 

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   ;  7   

$

 9#0911%& :1-0

 =  

    -001 

  "    "

$= !

 -001     6

  -001     

$

   "   "  



$

-  %9&1 :1-0

  2 

       " 

   #    

$

 -.//+000(+&01   

  -(+&01     

"$    "      



%$

????*

5$)-(.H91

+&+"878

$

*  (+& *   

A

 )#-3&1%*

 + 

 :" 7 *!  

*"      

77 *$  + &  ;77 2 

'*34

$

) 1 -1%4 %"*

+

 :" 7 *!

!/%996&%* ) 

 



   -(+&1 * 

4    *   

:.<0&.+)$

     7$;  7

  * 

  * $  + *

      

:      

 :  $  / 

    

-.<0&.+)1  "   

 "    

:

$



  F<    

  &  ;77 2   

 *    *

$*

777$

( )(/0 %1/ *

 + 

 :" 7 *! 

**77;77*

77;77*

$:F<

4"-F<&==1

5$



   



 *"$     %

  $  F* 

-)=(1 -.<&1  -F<1  "

*4*

     

$=

    

      

4""

KH+&=/=0) .20+.    

  '  ;77 2

$!$

6&%")65<=<*

       

$("

* 

88!$3 !

5$

   "    

4 !$

(  )<>*

 + 

 :" 7 *! 

:F<-F<1

4:3$

=4;7;77<$

 )<<*

 + 

 :" 7 *! 

*  3*   $

+4:3

:*$



=  <.&H0   4  

: 3  

3*     ! 

*$

6+:1-0%")65<=<6*

5 "



 7E  %     

! #  % " 

-/H9(=.91!%$+

*

002.      *  

  *$  +  

5*



*

5$

  ( ( 



      

"-/H9(=.91

 $  )  -090

;

 

       $  



$

-H21

    *$     

   -&0/

;

  

    '   

&()

$

.

-0901&() ' 

"$

    

-/H9(=.918



8

     

     *$  .

'

!/%996&%* ) 

 



"*"  -/H9(=.91

*$



.      

  -/H9(=.91   

     * 

*$

 :1-0

 + % "

-7?1-+/1$

$=

      

!$=

       878  

 $    "  

A





,

,

,

$

 ( 



 <

  9.+& .20+=.9

 !

$H5

5$

  

)0+) =0

! 

       

$-71

$4

 7  ???? 

!$   

4

A



B

B

B"

 

 (+&=5+=.9

(.9+9

    $   

 ((! 4  7$77  E7:7



$  

  *   

$((-

;



$



L(* ""((

 

 ,$%:7



 ,$%:7



 ,%77



 %7:7



 %7777

 %7



* ,$%:7



* ,%777

* ,%



* %7:7



* %77

* 7$%

0:A&?

:",,77



(A%7777:

,,77B?E:7



((

 +

  )=2&+M H9= 

 "      

$"

: *!"

(( !)

   !$    

" *     

*$

8(8"

$""A

 !

* *!

( (!

 "     

"*

(A



***

(3((3(

 5

  =0 5+0A (2 (2

"    

$"





 



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