Questions tagged [tolerance]
A window of acceptance, often expressed as a percentage, in which a non-perfect value is still accepted as usable.
112 questions
27
votes
10
answers
12k
views
Can a 10% resistor be used as a 1% resistor?
If my schematic calls for a 1% resistor, can I use a 10% resistor that measures to the correct resistance within 1% or is there some quality to tolerance beyond what it measures Ohm-wise?
For example,...
- 2,236
7
votes
6
answers
7k
views
Resistor Tolerance - are measured resistor with the same value but different tolerances the same?
Probably a real newbie question but I can't seem to find an answer easily...
If I have 2 resistors both 1K but one is a 1% tolerance and the other is 10% and I measure them and they are the same. Let'...
- 115
8
votes
3
answers
14k
views
Parts tolerance simulations in ltspice
I just recently found this tutorial (and various other places mentioning a similar technique) when trying to evaluate how one of my circuits behaves when using real world components with real world ...
- 6,698
0
votes
2
answers
4k
views
5v tolerance on 3.3v PIC
Many PIC microcontrollers such as PIC24EP512GU810 have 5V tolerant pins.
My question is how does this work. Do these devices have clamping diodes for ESD protection?
Would clamping the input voltage ...
- 874
2
votes
1
answer
657
views
PCB mounting - flatness
Let's say I have a square PCB with mounting holes near each corner and that the PCB will be mounted to an enclosure with 4 standoffs. Is there a rule of thumb about how much tolerance I can have on ...
- 3,090
2
votes
1
answer
4k
views
PCIe add-in card thickness tolerance
I can't find a tolerance measurement for the 62 mils thickness specified in the PCIe electromechanical spec. How much leeway do I have for board thickness in an add-in card.
Additional details: I'm ...
- 1,010
10
votes
10
answers
8k
views
Reducing the tolerance of resistors manually
All the resistors available come with a finite amount tolerance. This is undesirable particularly in highly sensitive systems. While we can use resistors with the least tolerance available, I want to ...
- 675
6
votes
2
answers
2k
views
5V Tolerance of 3.3V OUTPUT pin
Let's assume the following scenario:
uC (@3.3V VDD) drives an I/O pin HIGH 3.3V (just to be clear, it's not an open-drain pin, so the p-channel mosfet of the output pin is actually driving the pin to ...
- 61
2
votes
5
answers
3k
views
Hand-matching resistors: high-end DMM vs Wheatstone bridge
I wrote an article dealing with the question of hand-matching resistors to high tolerances using a DMM. The driving purpose behind that article is to show that it's harder to do that than one might na&...
- 3,762
2
votes
4
answers
908
views
soldering input pins to SN74HC595N shift register -- heat tolerance
I'm working on a project that uses the SN74HC595N shift register from TI. The nature of this project requires that I solder on pin extensions. My soldering skills are not too solid, so I'm worried ...
- 21
2
votes
1
answer
548
views
1.2 GHz Cloverleaf Antenna tolerance
I'm working on building my own Cloverleaf antennas, to work at 1.2 GHz, for the video system on my Quadcopter. At this frequency, what kind of tolerance am I looking at in terms of the length of the ...
- 617
17
votes
7
answers
7k
views
Why are we still using resistors with 5% tolerance while they can even manufacture a 14.318182MHz crystal?
Year is 2012 and I can only find 5%-tol resistors in the local market. They can make transistors at molecular scale, they can manufacture 14.318182MHz crystals, they can place trillions of flip-flops ...
- 14.2k