What does a resistor value of “NOM” mean?












1












$begingroup$


On this schematic of part of the Apollo Guidance computer (found here), some resistors have a value of "NOM."



NOM resistors



According to this question, "NOM" stands for "nominal" when it's found in a datasheet, but this isn't a datasheet and I don't see how "nominal" would make sense here.






resistors schematics terminology







share|improve this question











$endgroup$








  • 7




    $begingroup$
    It means the schematic software is very hungry and has started eating your circuit. I see further down it has started naming other components after Family Guy characters, so it must be going mad with hunger.
    $endgroup$
    – Benjamin Wharton
    2 hours ago










  • $begingroup$
    Now or NOM @BenjaminWharton that would have to be NOM NOM NOM.
    $endgroup$
    – StainlessSteelRat
    5 mins ago






  • 1




    $begingroup$
    It's old enough the schematic software might be called Dave or Fran
    $endgroup$
    – Journeyman Geek
    2 mins ago
















1












$begingroup$


On this schematic of part of the Apollo Guidance computer (found here), some resistors have a value of "NOM."



NOM resistors



According to this question, "NOM" stands for "nominal" when it's found in a datasheet, but this isn't a datasheet and I don't see how "nominal" would make sense here.






resistors schematics terminology







share|improve this question











$endgroup$








  • 7




    $begingroup$
    It means the schematic software is very hungry and has started eating your circuit. I see further down it has started naming other components after Family Guy characters, so it must be going mad with hunger.
    $endgroup$
    – Benjamin Wharton
    2 hours ago










  • $begingroup$
    Now or NOM @BenjaminWharton that would have to be NOM NOM NOM.
    $endgroup$
    – StainlessSteelRat
    5 mins ago






  • 1




    $begingroup$
    It's old enough the schematic software might be called Dave or Fran
    $endgroup$
    – Journeyman Geek
    2 mins ago














1












1








1





$begingroup$


On this schematic of part of the Apollo Guidance computer (found here), some resistors have a value of "NOM."



NOM resistors



According to this question, "NOM" stands for "nominal" when it's found in a datasheet, but this isn't a datasheet and I don't see how "nominal" would make sense here.






resistors schematics terminology







share|improve this question











$endgroup$




On this schematic of part of the Apollo Guidance computer (found here), some resistors have a value of "NOM."



NOM resistors



According to this question, "NOM" stands for "nominal" when it's found in a datasheet, but this isn't a datasheet and I don't see how "nominal" would make sense here.






resistors schematics terminology




resistors schematics terminology






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited 2 hours ago







Maxpm

















asked 2 hours ago









MaxpmMaxpm

275210




275210








  • 7




    $begingroup$
    It means the schematic software is very hungry and has started eating your circuit. I see further down it has started naming other components after Family Guy characters, so it must be going mad with hunger.
    $endgroup$
    – Benjamin Wharton
    2 hours ago










  • $begingroup$
    Now or NOM @BenjaminWharton that would have to be NOM NOM NOM.
    $endgroup$
    – StainlessSteelRat
    5 mins ago






  • 1




    $begingroup$
    It's old enough the schematic software might be called Dave or Fran
    $endgroup$
    – Journeyman Geek
    2 mins ago














  • 7




    $begingroup$
    It means the schematic software is very hungry and has started eating your circuit. I see further down it has started naming other components after Family Guy characters, so it must be going mad with hunger.
    $endgroup$
    – Benjamin Wharton
    2 hours ago










  • $begingroup$
    Now or NOM @BenjaminWharton that would have to be NOM NOM NOM.
    $endgroup$
    – StainlessSteelRat
    5 mins ago






  • 1




    $begingroup$
    It's old enough the schematic software might be called Dave or Fran
    $endgroup$
    – Journeyman Geek
    2 mins ago








7




7




$begingroup$
It means the schematic software is very hungry and has started eating your circuit. I see further down it has started naming other components after Family Guy characters, so it must be going mad with hunger.
$endgroup$
– Benjamin Wharton
2 hours ago




$begingroup$
It means the schematic software is very hungry and has started eating your circuit. I see further down it has started naming other components after Family Guy characters, so it must be going mad with hunger.
$endgroup$
– Benjamin Wharton
2 hours ago












$begingroup$
Now or NOM @BenjaminWharton that would have to be NOM NOM NOM.
$endgroup$
– StainlessSteelRat
5 mins ago




$begingroup$
Now or NOM @BenjaminWharton that would have to be NOM NOM NOM.
$endgroup$
– StainlessSteelRat
5 mins ago




1




1




$begingroup$
It's old enough the schematic software might be called Dave or Fran
$endgroup$
– Journeyman Geek
2 mins ago




$begingroup$
It's old enough the schematic software might be called Dave or Fran
$endgroup$
– Journeyman Geek
2 mins ago










3 Answers
3






active

oldest

votes


















6












$begingroup$

The notes in the bottom left of the schematic tell you to "select R3, R7 and R14 per applicable PS from appropriate chart", so "NOM" indicates to look in the tables.



As of yet, I have no idea what to do exactly with the numbers in the appropriate tables, and neither do I have any idea what "PS" means.



I'm a bit in the mist about the exact etymology of "NOM", but it cold be "nomogram", despite some tables giving the values instead of graphs. Maybe it's "Notice of Modification"?






share|improve this answer











$endgroup$









  • 1




    $begingroup$
    That “interpret schematic in accordance standard prescribed by MIL D-70327” is probably where the answer lies.
    $endgroup$
    – winny
    2 hours ago



















3












$begingroup$

NOt Mounted.



A variation of DNM, Do Not Mount.






share|improve this answer









$endgroup$













  • $begingroup$
    Could it mean not mounted, but if to be mounted in a further design point, select from these resistors?
    $endgroup$
    – mehmet.ali.anil
    2 hours ago



















1












$begingroup$

These were hand drawn and you usually have to check around the first few sheets to understand the syntax.



Check out NASA Drawing 2005904.



NOM means NOMINAL.



Nominal



As for the NOM values. These refer to the actual part numbers.



Part Numbers



So R3 and R4 are 22kΩ, 1/2W resistors, Part No 1006760-64.



R1 and R2 2%, 1/4W resistors that are referenced in the table, Part Number 1006750.



Looks like 1006750 is the generic part number for resistors.



R1 & R2



With Part No 1006760-XXX referring to different actual resistors for different part lists. Different versions for different iterations of the design.



So R2 is Part No 1006760-25, which is a 510Ω resistor. Similarly R3 on the sheet you reference is the same part number.



R3





share











$endgroup$













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    3 Answers
    3






    active

    oldest

    votes








    3 Answers
    3






    active

    oldest

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    active

    oldest

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    active

    oldest

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    6












    $begingroup$

    The notes in the bottom left of the schematic tell you to "select R3, R7 and R14 per applicable PS from appropriate chart", so "NOM" indicates to look in the tables.



    As of yet, I have no idea what to do exactly with the numbers in the appropriate tables, and neither do I have any idea what "PS" means.



    I'm a bit in the mist about the exact etymology of "NOM", but it cold be "nomogram", despite some tables giving the values instead of graphs. Maybe it's "Notice of Modification"?






    share|improve this answer











    $endgroup$









    • 1




      $begingroup$
      That “interpret schematic in accordance standard prescribed by MIL D-70327” is probably where the answer lies.
      $endgroup$
      – winny
      2 hours ago
















    6












    $begingroup$

    The notes in the bottom left of the schematic tell you to "select R3, R7 and R14 per applicable PS from appropriate chart", so "NOM" indicates to look in the tables.



    As of yet, I have no idea what to do exactly with the numbers in the appropriate tables, and neither do I have any idea what "PS" means.



    I'm a bit in the mist about the exact etymology of "NOM", but it cold be "nomogram", despite some tables giving the values instead of graphs. Maybe it's "Notice of Modification"?






    share|improve this answer











    $endgroup$









    • 1




      $begingroup$
      That “interpret schematic in accordance standard prescribed by MIL D-70327” is probably where the answer lies.
      $endgroup$
      – winny
      2 hours ago














    6












    6








    6





    $begingroup$

    The notes in the bottom left of the schematic tell you to "select R3, R7 and R14 per applicable PS from appropriate chart", so "NOM" indicates to look in the tables.



    As of yet, I have no idea what to do exactly with the numbers in the appropriate tables, and neither do I have any idea what "PS" means.



    I'm a bit in the mist about the exact etymology of "NOM", but it cold be "nomogram", despite some tables giving the values instead of graphs. Maybe it's "Notice of Modification"?






    share|improve this answer











    $endgroup$



    The notes in the bottom left of the schematic tell you to "select R3, R7 and R14 per applicable PS from appropriate chart", so "NOM" indicates to look in the tables.



    As of yet, I have no idea what to do exactly with the numbers in the appropriate tables, and neither do I have any idea what "PS" means.



    I'm a bit in the mist about the exact etymology of "NOM", but it cold be "nomogram", despite some tables giving the values instead of graphs. Maybe it's "Notice of Modification"?







    share|improve this answer














    share|improve this answer



    share|improve this answer








    edited 2 hours ago

























    answered 2 hours ago









    zebonautzebonaut

    15.9k14489




    15.9k14489








    • 1




      $begingroup$
      That “interpret schematic in accordance standard prescribed by MIL D-70327” is probably where the answer lies.
      $endgroup$
      – winny
      2 hours ago














    • 1




      $begingroup$
      That “interpret schematic in accordance standard prescribed by MIL D-70327” is probably where the answer lies.
      $endgroup$
      – winny
      2 hours ago








    1




    1




    $begingroup$
    That “interpret schematic in accordance standard prescribed by MIL D-70327” is probably where the answer lies.
    $endgroup$
    – winny
    2 hours ago




    $begingroup$
    That “interpret schematic in accordance standard prescribed by MIL D-70327” is probably where the answer lies.
    $endgroup$
    – winny
    2 hours ago













    3












    $begingroup$

    NOt Mounted.



    A variation of DNM, Do Not Mount.






    share|improve this answer









    $endgroup$













    • $begingroup$
      Could it mean not mounted, but if to be mounted in a further design point, select from these resistors?
      $endgroup$
      – mehmet.ali.anil
      2 hours ago
















    3












    $begingroup$

    NOt Mounted.



    A variation of DNM, Do Not Mount.






    share|improve this answer









    $endgroup$













    • $begingroup$
      Could it mean not mounted, but if to be mounted in a further design point, select from these resistors?
      $endgroup$
      – mehmet.ali.anil
      2 hours ago














    3












    3








    3





    $begingroup$

    NOt Mounted.



    A variation of DNM, Do Not Mount.






    share|improve this answer









    $endgroup$



    NOt Mounted.



    A variation of DNM, Do Not Mount.







    share|improve this answer












    share|improve this answer



    share|improve this answer










    answered 2 hours ago









    winnywinny

    4,86331832




    4,86331832












    • $begingroup$
      Could it mean not mounted, but if to be mounted in a further design point, select from these resistors?
      $endgroup$
      – mehmet.ali.anil
      2 hours ago


















    • $begingroup$
      Could it mean not mounted, but if to be mounted in a further design point, select from these resistors?
      $endgroup$
      – mehmet.ali.anil
      2 hours ago
















    $begingroup$
    Could it mean not mounted, but if to be mounted in a further design point, select from these resistors?
    $endgroup$
    – mehmet.ali.anil
    2 hours ago




    $begingroup$
    Could it mean not mounted, but if to be mounted in a further design point, select from these resistors?
    $endgroup$
    – mehmet.ali.anil
    2 hours ago











    1












    $begingroup$

    These were hand drawn and you usually have to check around the first few sheets to understand the syntax.



    Check out NASA Drawing 2005904.



    NOM means NOMINAL.



    Nominal



    As for the NOM values. These refer to the actual part numbers.



    Part Numbers



    So R3 and R4 are 22kΩ, 1/2W resistors, Part No 1006760-64.



    R1 and R2 2%, 1/4W resistors that are referenced in the table, Part Number 1006750.



    Looks like 1006750 is the generic part number for resistors.



    R1 & R2



    With Part No 1006760-XXX referring to different actual resistors for different part lists. Different versions for different iterations of the design.



    So R2 is Part No 1006760-25, which is a 510Ω resistor. Similarly R3 on the sheet you reference is the same part number.



    R3





    share











    $endgroup$


















      1












      $begingroup$

      These were hand drawn and you usually have to check around the first few sheets to understand the syntax.



      Check out NASA Drawing 2005904.



      NOM means NOMINAL.



      Nominal



      As for the NOM values. These refer to the actual part numbers.



      Part Numbers



      So R3 and R4 are 22kΩ, 1/2W resistors, Part No 1006760-64.



      R1 and R2 2%, 1/4W resistors that are referenced in the table, Part Number 1006750.



      Looks like 1006750 is the generic part number for resistors.



      R1 & R2



      With Part No 1006760-XXX referring to different actual resistors for different part lists. Different versions for different iterations of the design.



      So R2 is Part No 1006760-25, which is a 510Ω resistor. Similarly R3 on the sheet you reference is the same part number.



      R3





      share











      $endgroup$
















        1












        1








        1





        $begingroup$

        These were hand drawn and you usually have to check around the first few sheets to understand the syntax.



        Check out NASA Drawing 2005904.



        NOM means NOMINAL.



        Nominal



        As for the NOM values. These refer to the actual part numbers.



        Part Numbers



        So R3 and R4 are 22kΩ, 1/2W resistors, Part No 1006760-64.



        R1 and R2 2%, 1/4W resistors that are referenced in the table, Part Number 1006750.



        Looks like 1006750 is the generic part number for resistors.



        R1 & R2



        With Part No 1006760-XXX referring to different actual resistors for different part lists. Different versions for different iterations of the design.



        So R2 is Part No 1006760-25, which is a 510Ω resistor. Similarly R3 on the sheet you reference is the same part number.



        R3





        share











        $endgroup$



        These were hand drawn and you usually have to check around the first few sheets to understand the syntax.



        Check out NASA Drawing 2005904.



        NOM means NOMINAL.



        Nominal



        As for the NOM values. These refer to the actual part numbers.



        Part Numbers



        So R3 and R4 are 22kΩ, 1/2W resistors, Part No 1006760-64.



        R1 and R2 2%, 1/4W resistors that are referenced in the table, Part Number 1006750.



        Looks like 1006750 is the generic part number for resistors.



        R1 & R2



        With Part No 1006760-XXX referring to different actual resistors for different part lists. Different versions for different iterations of the design.



        So R2 is Part No 1006760-25, which is a 510Ω resistor. Similarly R3 on the sheet you reference is the same part number.



        R3






        share













        share


        share








        edited 2 mins ago

























        answered 8 mins ago









        StainlessSteelRatStainlessSteelRat

        3,271617




        3,271617






























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