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
asked 4 hours ago
MaxpmMaxpm
280210
$endgroup$
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
asked 4 hours ago
MaxpmMaxpm
280210
$endgroup$
9
$begingroup$
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
4 hours ago
$begingroup$
Now or NOM @BenjaminWharton that would have to be NOM NOM NOM.
$endgroup$
– StainlessSteelRat
1 hour ago
2
$begingroup$
It's old enough the schematic software might be called Dave or Fran
$endgroup$
– Journeyman Geek
1 hour ago
$begingroup$
Probably not Fran! @JourneymanGeek Maybe Frank.
$endgroup$
– StainlessSteelRat
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
asked 4 hours ago
MaxpmMaxpm
280210
$endgroup$
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
asked 4 hours ago
MaxpmMaxpm
280210
asked 4 hours ago
MaxpmMaxpm
280210
edited 3 hours ago
Maxpm
asked 4 hours ago
MaxpmMaxpm
280210
asked 4 hours ago
MaxpmMaxpm
280210
asked 4 hours ago
MaxpmMaxpm
280210
280210
9
$begingroup$
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
4 hours ago
$begingroup$
Now or NOM @BenjaminWharton that would have to be NOM NOM NOM.
$endgroup$
– StainlessSteelRat
1 hour ago
2
$begingroup$
It's old enough the schematic software might be called Dave or Fran
$endgroup$
– Journeyman Geek
1 hour ago
$begingroup$
Probably not Fran! @JourneymanGeek Maybe Frank.
$endgroup$
– StainlessSteelRat
1 hour ago
add a comment |
9
$begingroup$
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
4 hours ago
$begingroup$
Now or NOM @BenjaminWharton that would have to be NOM NOM NOM.
$endgroup$
– StainlessSteelRat
1 hour ago
2
$begingroup$
It's old enough the schematic software might be called Dave or Fran
$endgroup$
– Journeyman Geek
1 hour ago
$begingroup$
Probably not Fran! @JourneymanGeek Maybe Frank.
$endgroup$
– StainlessSteelRat
1 hour ago
9
9
$begingroup$
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
4 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
4 hours ago
$begingroup$
Now or NOM @BenjaminWharton that would have to be NOM NOM NOM.
$endgroup$
– StainlessSteelRat
1 hour ago
$begingroup$
Now or NOM @BenjaminWharton that would have to be NOM NOM NOM.
$endgroup$
– StainlessSteelRat
1 hour ago
2
2
$begingroup$
It's old enough the schematic software might be called Dave or Fran
$endgroup$
– Journeyman Geek
1 hour ago
$begingroup$
It's old enough the schematic software might be called Dave or Fran
$endgroup$
– Journeyman Geek
1 hour ago
$begingroup$
Probably not Fran! @JourneymanGeek Maybe Frank.
$endgroup$
– StainlessSteelRat
1 hour ago
$begingroup$
Probably not Fran! @JourneymanGeek Maybe Frank.
$endgroup$
– StainlessSteelRat
1 hour ago
add a comment |
3 Answers
3
active
oldest
votes
$begingroup$
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"?
answered 4 hours ago
zebonautzebonaut
15.9k14489
$endgroup$
1
$begingroup$
That “interpret schematic in accordance standard prescribed by MIL D-70327” is probably where the answer lies.
$endgroup$
– winny
3 hours ago
add a comment |
$begingroup$
NOt Mounted.
A variation of DNM, Do Not Mount.
answered 4 hours ago
winnywinny
4,86331832
$endgroup$
$begingroup$
Could it mean not mounted, but if to be mounted in a further design point, select from these resistors?
$endgroup$
– mehmet.ali.anil
4 hours 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.
answered 1 hour ago
StainlessSteelRatStainlessSteelRat
3,291617
$endgroup$
add a comment |
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3 Answers
3
active
oldest
votes
3 Answers
3
active
oldest
votes
active
oldest
votes
active
oldest
votes
$begingroup$
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"?
answered 4 hours ago
zebonautzebonaut
15.9k14489
$endgroup$
1
$begingroup$
That “interpret schematic in accordance standard prescribed by MIL D-70327” is probably where the answer lies.
$endgroup$
– winny
3 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"?
answered 4 hours ago
zebonautzebonaut
15.9k14489
$endgroup$
1
$begingroup$
That “interpret schematic in accordance standard prescribed by MIL D-70327” is probably where the answer lies.
$endgroup$
– winny
3 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"?
answered 4 hours ago
zebonautzebonaut
15.9k14489
$endgroup$
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"?
answered 4 hours ago
zebonautzebonaut
15.9k14489
edited 4 hours ago
answered 4 hours ago
zebonautzebonaut
15.9k14489
answered 4 hours ago
zebonautzebonaut
15.9k14489
answered 4 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
3 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
3 hours ago
1
1
$begingroup$
That “interpret schematic in accordance standard prescribed by MIL D-70327” is probably where the answer lies.
$endgroup$
– winny
3 hours ago
$begingroup$
That “interpret schematic in accordance standard prescribed by MIL D-70327” is probably where the answer lies.
$endgroup$
– winny
3 hours ago
add a comment |
$begingroup$
NOt Mounted.
A variation of DNM, Do Not Mount.
answered 4 hours ago
winnywinny
4,86331832
$endgroup$
$begingroup$
Could it mean not mounted, but if to be mounted in a further design point, select from these resistors?
$endgroup$
– mehmet.ali.anil
4 hours ago
add a comment |
$begingroup$
NOt Mounted.
A variation of DNM, Do Not Mount.
answered 4 hours ago
winnywinny
4,86331832
$endgroup$
$begingroup$
Could it mean not mounted, but if to be mounted in a further design point, select from these resistors?
$endgroup$
– mehmet.ali.anil
4 hours ago
add a comment |
$begingroup$
NOt Mounted.
A variation of DNM, Do Not Mount.
answered 4 hours ago
winnywinny
4,86331832
$endgroup$
NOt Mounted.
A variation of DNM, Do Not Mount.
answered 4 hours ago
winnywinny
4,86331832
answered 4 hours ago
winnywinny
4,86331832
answered 4 hours ago
winnywinny
4,86331832
answered 4 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
4 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
4 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
4 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
4 hours 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.
answered 1 hour ago
StainlessSteelRatStainlessSteelRat
3,291617
$endgroup$
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.
answered 1 hour ago
StainlessSteelRatStainlessSteelRat
3,291617
$endgroup$
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.
answered 1 hour ago
StainlessSteelRatStainlessSteelRat
3,291617
$endgroup$
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.
answered 1 hour ago
StainlessSteelRatStainlessSteelRat
3,291617
edited 23 mins ago
answered 1 hour ago
StainlessSteelRatStainlessSteelRat
3,291617
answered 1 hour ago
StainlessSteelRatStainlessSteelRat
3,291617
answered 1 hour ago
StainlessSteelRatStainlessSteelRat
3,291617
3,291617
add a comment |
add a comment |
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9
$begingroup$
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
4 hours ago
$begingroup$
Now or NOM @BenjaminWharton that would have to be NOM NOM NOM.
$endgroup$
– StainlessSteelRat
1 hour ago
2
$begingroup$
It's old enough the schematic software might be called Dave or Fran
$endgroup$
– Journeyman Geek
1 hour ago
$begingroup$
Probably not Fran! @JourneymanGeek Maybe Frank.
$endgroup$
– StainlessSteelRat
1 hour ago