What does a resistor value of “NOM” mean?
$begingroup$
On this schematic of part of the Apollo Guidance computer (found here), some resistors have a value of "NOM."
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
$endgroup$
add a comment |
$begingroup$
On this schematic of part of the Apollo Guidance computer (found here), some resistors have a value of "NOM."
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
$endgroup$
10
$begingroup$
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
6 hours ago
$begingroup$
Now or NOM @BenjaminWharton that would have to be NOM NOM NOM.
$endgroup$
– StainlessSteelRat
3 hours ago
2
$begingroup$
It's old enough the schematic software might be called Dave or Fran
$endgroup$
– Journeyman Geek
3 hours ago
$begingroup$
Probably not Fran! @JourneymanGeek Maybe Frank.
$endgroup$
– StainlessSteelRat
3 hours ago
1
$begingroup$
@StainlessSteelRat Shouldn't that be Ohm Nom Nom?
$endgroup$
– fluffy
1 hour ago
add a comment |
$begingroup$
On this schematic of part of the Apollo Guidance computer (found here), some resistors have a value of "NOM."
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
$endgroup$
On this schematic of part of the Apollo Guidance computer (found here), some resistors have a value of "NOM."
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
edited 5 hours ago
Maxpm
asked 6 hours ago
MaxpmMaxpm
302210
302210
10
$begingroup$
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
6 hours ago
$begingroup$
Now or NOM @BenjaminWharton that would have to be NOM NOM NOM.
$endgroup$
– StainlessSteelRat
3 hours ago
2
$begingroup$
It's old enough the schematic software might be called Dave or Fran
$endgroup$
– Journeyman Geek
3 hours ago
$begingroup$
Probably not Fran! @JourneymanGeek Maybe Frank.
$endgroup$
– StainlessSteelRat
3 hours ago
1
$begingroup$
@StainlessSteelRat Shouldn't that be Ohm Nom Nom?
$endgroup$
– fluffy
1 hour ago
add a comment |
10
$begingroup$
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
6 hours ago
$begingroup$
Now or NOM @BenjaminWharton that would have to be NOM NOM NOM.
$endgroup$
– StainlessSteelRat
3 hours ago
2
$begingroup$
It's old enough the schematic software might be called Dave or Fran
$endgroup$
– Journeyman Geek
3 hours ago
$begingroup$
Probably not Fran! @JourneymanGeek Maybe Frank.
$endgroup$
– StainlessSteelRat
3 hours ago
1
$begingroup$
@StainlessSteelRat Shouldn't that be Ohm Nom Nom?
$endgroup$
– fluffy
1 hour ago
10
10
$begingroup$
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
6 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
6 hours ago
$begingroup$
Now or NOM @BenjaminWharton that would have to be NOM NOM NOM.
$endgroup$
– StainlessSteelRat
3 hours ago
$begingroup$
Now or NOM @BenjaminWharton that would have to be NOM NOM NOM.
$endgroup$
– StainlessSteelRat
3 hours ago
2
2
$begingroup$
It's old enough the schematic software might be called Dave or Fran
$endgroup$
– Journeyman Geek
3 hours ago
$begingroup$
It's old enough the schematic software might be called Dave or Fran
$endgroup$
– Journeyman Geek
3 hours ago
$begingroup$
Probably not Fran! @JourneymanGeek Maybe Frank.
$endgroup$
– StainlessSteelRat
3 hours ago
$begingroup$
Probably not Fran! @JourneymanGeek Maybe Frank.
$endgroup$
– StainlessSteelRat
3 hours ago
1
1
$begingroup$
@StainlessSteelRat Shouldn't that be Ohm Nom Nom?
$endgroup$
– fluffy
1 hour ago
$begingroup$
@StainlessSteelRat Shouldn't that be Ohm Nom Nom?
$endgroup$
– fluffy
1 hour ago
add a comment |
3 Answers
3
active
oldest
votes
$begingroup$
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.
As for the NOM values. These refer to the actual part numbers.
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 1006760 is the generic part number for 1/2W resistors and 1006750 are 1/4W resistors. These resistors are in bins and these boards were probably assembled by hand.
With Part No 1006750-XXX referring to different actual resistors for different part lists. Different versions for different iterations of the design. As in 126 is bin 126 in the parts inventory.
Part No 1006750-126 to 1006750-129 are (probably) 1% resistors towards the end of the design period.
So R2 is Part No 1006750-25, which is a 510Ω resistor. Similarly R3 on the sheet you reference is the same part number.
$endgroup$
$begingroup$
I suppose they used "nominal" to mean "you should look up this component by name." It's a usage I haven't seen before, but I guess this is the definitive answer.
$endgroup$
– Maxpm
1 hour ago
add a comment |
$begingroup$
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"?
$endgroup$
1
$begingroup$
That “interpret schematic in accordance standard prescribed by MIL D-70327” is probably where the answer lies.
$endgroup$
– winny
5 hours ago
add a comment |
$begingroup$
NOt Mounted.
A variation of DNM, Do Not Mount.
$endgroup$
$begingroup$
Could it mean not mounted, but if to be mounted in a further design point, select from these resistors?
$endgroup$
– mehmet.ali.anil
6 hours ago
add a comment |
Your Answer
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3 Answers
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active
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3 Answers
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$begingroup$
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.
As for the NOM values. These refer to the actual part numbers.
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 1006760 is the generic part number for 1/2W resistors and 1006750 are 1/4W resistors. These resistors are in bins and these boards were probably assembled by hand.
With Part No 1006750-XXX referring to different actual resistors for different part lists. Different versions for different iterations of the design. As in 126 is bin 126 in the parts inventory.
Part No 1006750-126 to 1006750-129 are (probably) 1% resistors towards the end of the design period.
So R2 is Part No 1006750-25, which is a 510Ω resistor. Similarly R3 on the sheet you reference is the same part number.
$endgroup$
$begingroup$
I suppose they used "nominal" to mean "you should look up this component by name." It's a usage I haven't seen before, but I guess this is the definitive answer.
$endgroup$
– Maxpm
1 hour ago
add a comment |
$begingroup$
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.
As for the NOM values. These refer to the actual part numbers.
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 1006760 is the generic part number for 1/2W resistors and 1006750 are 1/4W resistors. These resistors are in bins and these boards were probably assembled by hand.
With Part No 1006750-XXX referring to different actual resistors for different part lists. Different versions for different iterations of the design. As in 126 is bin 126 in the parts inventory.
Part No 1006750-126 to 1006750-129 are (probably) 1% resistors towards the end of the design period.
So R2 is Part No 1006750-25, which is a 510Ω resistor. Similarly R3 on the sheet you reference is the same part number.
$endgroup$
$begingroup$
I suppose they used "nominal" to mean "you should look up this component by name." It's a usage I haven't seen before, but I guess this is the definitive answer.
$endgroup$
– Maxpm
1 hour ago
add a comment |
$begingroup$
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.
As for the NOM values. These refer to the actual part numbers.
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 1006760 is the generic part number for 1/2W resistors and 1006750 are 1/4W resistors. These resistors are in bins and these boards were probably assembled by hand.
With Part No 1006750-XXX referring to different actual resistors for different part lists. Different versions for different iterations of the design. As in 126 is bin 126 in the parts inventory.
Part No 1006750-126 to 1006750-129 are (probably) 1% resistors towards the end of the design period.
So R2 is Part No 1006750-25, which is a 510Ω resistor. Similarly R3 on the sheet you reference is the same part number.
$endgroup$
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.
As for the NOM values. These refer to the actual part numbers.
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 1006760 is the generic part number for 1/2W resistors and 1006750 are 1/4W resistors. These resistors are in bins and these boards were probably assembled by hand.
With Part No 1006750-XXX referring to different actual resistors for different part lists. Different versions for different iterations of the design. As in 126 is bin 126 in the parts inventory.
Part No 1006750-126 to 1006750-129 are (probably) 1% resistors towards the end of the design period.
So R2 is Part No 1006750-25, which is a 510Ω resistor. Similarly R3 on the sheet you reference is the same part number.
edited 2 hours ago
answered 3 hours ago
StainlessSteelRatStainlessSteelRat
3,336617
3,336617
$begingroup$
I suppose they used "nominal" to mean "you should look up this component by name." It's a usage I haven't seen before, but I guess this is the definitive answer.
$endgroup$
– Maxpm
1 hour ago
add a comment |
$begingroup$
I suppose they used "nominal" to mean "you should look up this component by name." It's a usage I haven't seen before, but I guess this is the definitive answer.
$endgroup$
– Maxpm
1 hour ago
$begingroup$
I suppose they used "nominal" to mean "you should look up this component by name." It's a usage I haven't seen before, but I guess this is the definitive answer.
$endgroup$
– Maxpm
1 hour ago
$begingroup$
I suppose they used "nominal" to mean "you should look up this component by name." It's a usage I haven't seen before, but I guess this is the definitive answer.
$endgroup$
– Maxpm
1 hour ago
add a comment |
$begingroup$
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"?
$endgroup$
1
$begingroup$
That “interpret schematic in accordance standard prescribed by MIL D-70327” is probably where the answer lies.
$endgroup$
– winny
5 hours ago
add a comment |
$begingroup$
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"?
$endgroup$
1
$begingroup$
That “interpret schematic in accordance standard prescribed by MIL D-70327” is probably where the answer lies.
$endgroup$
– winny
5 hours ago
add a comment |
$begingroup$
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"?
$endgroup$
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"?
edited 5 hours ago
answered 6 hours ago
zebonautzebonaut
16k14489
16k14489
1
$begingroup$
That “interpret schematic in accordance standard prescribed by MIL D-70327” is probably where the answer lies.
$endgroup$
– winny
5 hours ago
add a comment |
1
$begingroup$
That “interpret schematic in accordance standard prescribed by MIL D-70327” is probably where the answer lies.
$endgroup$
– winny
5 hours ago
1
1
$begingroup$
That “interpret schematic in accordance standard prescribed by MIL D-70327” is probably where the answer lies.
$endgroup$
– winny
5 hours ago
$begingroup$
That “interpret schematic in accordance standard prescribed by MIL D-70327” is probably where the answer lies.
$endgroup$
– winny
5 hours ago
add a comment |
$begingroup$
NOt Mounted.
A variation of DNM, Do Not Mount.
$endgroup$
$begingroup$
Could it mean not mounted, but if to be mounted in a further design point, select from these resistors?
$endgroup$
– mehmet.ali.anil
6 hours ago
add a comment |
$begingroup$
NOt Mounted.
A variation of DNM, Do Not Mount.
$endgroup$
$begingroup$
Could it mean not mounted, but if to be mounted in a further design point, select from these resistors?
$endgroup$
– mehmet.ali.anil
6 hours ago
add a comment |
$begingroup$
NOt Mounted.
A variation of DNM, Do Not Mount.
$endgroup$
NOt Mounted.
A variation of DNM, Do Not Mount.
answered 6 hours ago
winnywinny
4,87331832
4,87331832
$begingroup$
Could it mean not mounted, but if to be mounted in a further design point, select from these resistors?
$endgroup$
– mehmet.ali.anil
6 hours ago
add a comment |
$begingroup$
Could it mean not mounted, but if to be mounted in a further design point, select from these resistors?
$endgroup$
– mehmet.ali.anil
6 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
6 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
6 hours ago
add a comment |
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10
$begingroup$
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
6 hours ago
$begingroup$
Now or NOM @BenjaminWharton that would have to be NOM NOM NOM.
$endgroup$
– StainlessSteelRat
3 hours ago
2
$begingroup$
It's old enough the schematic software might be called Dave or Fran
$endgroup$
– Journeyman Geek
3 hours ago
$begingroup$
Probably not Fran! @JourneymanGeek Maybe Frank.
$endgroup$
– StainlessSteelRat
3 hours ago
1
$begingroup$
@StainlessSteelRat Shouldn't that be Ohm Nom Nom?
$endgroup$
– fluffy
1 hour ago