Questions tagged [standard]

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Is there a published standard for 'euro modules'?

Variously called 'Euro modules', 'Euromods', 'Euro modular', these are 'standard' sized units (1U, 2U, ..) that slot into face plates - e.g. a 1-gang face plate can take 2U; 2-gang fits 4U - that can ...
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Do we need to define the delay, power and constraint templates for characterising a library (.lib) file out of post-layout netlists (transistor level)

I am designing standard cells at the transistor level and I want the characterize these cells into a library file (.lib). Do I need to define the delay, power and constraint templates (sequential) ...
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20 views

Compatibility of trace/conductor clearance standards and SOTA IC packages

this is one of those questions where one has to pay special attention phrasing it to not get SO-bashed for not being specific enough. However, apart from getting some answers to specific aspects ...
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3answers
63 views

Is there a resource to look up widely in-use/standard connector styles?

I'm working on rebuilding a design that currently uses obsolete parts. I'm taking the opportunity to increase reading accuracy. In doing so, I will have to replace our current connector to go from a 2 ...
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28 views

Thermal resistance and JECED standards

Looking at the STCS1A datasheet I read: ...
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1answer
22 views

Which UL standard(s) holds the specifications of all UL AWM styles of cabling?

Which UL standard documents the specifications of all UL AWM styles of cabling, detailing their construction, conductor sizes, insulation, etc. ? In my research, I was directed to UL Standard 758 ...
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1answer
72 views

Wire color standards for a reversible DC motor [closed]

I'm working on a project with a DC motor that runs in both directions. If the motor ran only in one direction, I'd use red/black for positive and ground, but as they reverse, there isn't a consistent ...
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2answers
74 views

Square wave, triangle wave etc. not defined in International Electrotechnical Vocabulary (IEV.) Are they not standard terminology?

Why are there no definitions for typical terms like square wave, triangle wave etc. in the International Electrotechnical Vocabulary (IEV)? Are these widely used descriptions not defined by ...
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1answer
64 views

Is a VL3030 a suitable replacement for a ML2430

Hi i am attempting to replace a battery in my electronic compass and im supposed to use an ML2430 however this is proving to be hard to get hold of and expensive. Im concidering using a VL 3032/HF5N ...
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15 views

Is there a standard equivalent to automotive standard AEC-Q200 for the medical sector?

I want to ensure components of high integrity characteristics are utilised in a design by a third party. In the automotive sector AEC-Q200 can be stipulated, e.g. (https://www.digikey.com/en/product-...
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1answer
46 views

Is there an international standard on the frequencies used by car toll tags?

We're finding that when we drive through a car-toll collection point, our Car-Pay Wifi connection cuts out. (Music and maps cut out). I'm guessing that the Car-toll tag system uses the same ...
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2answers
74 views

What standard must a component/ device comply with to be industrial grade?

I am looking at an iot device that claims to be industrial grade. It meets standards such as UL60950-1 and has an operating temperature -40 --> 85C so looks good but is that enough? Exactly what ...
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IEC60950: cable distribution network definition

The definition of a cable distribution network is given in IEC60950: "mainly intended for transmission of video and/or audio signals between separate buildings or between outdoor antennas and ...
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42 views

Are there standardized values for the turn ratio of transformers?

I am simulating a dc battery charger. The circuit contains a step down transformer I will need to lower the tension from 311 V (Vp) (or 220 RMS) to 15 V (Vp). One possible option for the turn ratio ...
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23 views

IEC grounding and bonding standard

Is there an equivalent standard in IEC such as UL 467 or IEEE 837 which talks about the various test procedure for bonding clamps? Is IEC 61914:2015 similar to UL 467?
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49 views

UL 1971: is there a tolerance on strobe flash rates?

UL 1971 27.1.3(a) requires that listed strobes used for fire alarm signaling to hearing-impaired occupants flash at between 1 and 2 flashes per second: a) Signaling lights shall produce a candela ...
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35 views

Is putting a board inside an anti-static enclosure enough to make it Ex ib ready?

A year ago, we made a handheld PDA based on RPi0 for a client. Now they have asked us to certificate it as Ex ib IIC T4. Here is the PDA's spec: RPi0 as processing board 4.3" capcitive LCD A ...
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27 views

Medium to High Voltage Transformer Standards

While looking at IEC standards, I came across the IEC 60076, which basically establishes pretty much everything about power transformers. I'm particularly interested in maintenance routines and ...
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56 views

ETSI Definition of “Channelized system”

ETSI standards EN 301 489-1 and EN 300 330 use the term "channelized" (system or equipment). But I could not find any definition for "channelized" in one of the standards or any ...
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1answer
38 views

What's the minimum equipment rating required to perform testing in production environment? [closed]

I would like to purchase a Power supply to test my unit in production environment. The power supply is expected to support a production yield of 1 Million units per year. As per one of the test ...
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23 views

Grounding standard for mechanical/crimping connector

Can anyone tell me if there is a grounding standard that takes about mechanical/crimping connectors, I am looking for an IEC standard. I cam across IEC 61238-1 but this talks about power cables, are ...
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2answers
557 views

Are pins supposed to have the same thickness by some standard?

I bought a DHT-22 temperature sensor, some other sensors, and some jumper cables. The cable and the pins on other sensors and a Raspberry Pi fitted well, but the pins on DHT-22 seem thinner. The ...
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3answers
152 views

Name of UART standard, if any

my question simply is to know where is the origin of UART system. Is there any standard covering it. I can only see similar question here but the only answer is saying Wikipedia !!! I can see many ...
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1answer
26 views

61000-3-2 Pre-compliance harmonics

I am wondering about 61000-3-2 current harmonics pre-compliance test. Say a company designs a single-phase [up to 13A] power converter for low-line 115V and high-line 230V and pass 61000-3-2 pre-...
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2answers
774 views

If there is a cable and jack standard for I2C?

I want to do a connection of multiple current and voltage meters, they connect by I2C. Is for to monitor solar panels and batteries, they will be a considerable distance from the master. I thinking ...
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1answer
51 views

Understanding cable standards for low voltage conductors in high voltage environments

I am currently getting some custom cables made and having a serious communication issue with several cable manufacturers. I want several low voltage (5V DC) insulated conductors in a jacket that can ...
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1answer
183 views

VPX Radial Clock Vs Bussed Clock

I'm learning some concepts about OpenVPX. One thing I am a bit confused about is the notion of a radial clock versus a bussed clock. I'm not getting many helpful google hits. Can someone explain the ...
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2answers
106 views

Firmware coding - applicable standards

I would like to know if there are any applicable standards when coding microcontroller firmware (ARM) in order to achieve a specific quality level. In my case, I would like to code firmware for a ...
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1answer
44 views

How to discretize value like EDF ( or other electricity companie )

I make a solution using some automate like : A9MEM2050 ( Shneider ) ( and more advanced, so i have a lot a different value , that include rpm, psi, armonic, etc ...) Every automate send a value every ...
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2answers
43 views

Standard dimension for Li ion batteries

I wonder why is there no standard for Lithium ion batteries especially for portable devices,we can easily have a standard dimension/fit for similar capacities and power rating imposed by IEEE or ...
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47 views

Why is there a discrepancy in the E192 series? [duplicate]

For all series from E48 through E192, this holds true: $$ value = 10^{\frac i n} $$ where i is the zero-based index in the series and n is the length of the series. The one exception is E192[185]: $...
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567 views

Medical electronic devices quality

Is there a special grade for electronic components made to be used in medical devices such as life support systems? I have read in most data sheets that "this product is not to be used in life support ...
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142 views

Is there a standard for this “outdoor light systems connector”?

I have a strand of LED Christmas lights I'd like to control with an ESP8266. It has a two-pin DC connector that attaches to a wall-wart adapter so ideally I would keep both and insert the ESP8266 ...
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1answer
75 views

Using MIL-DTL-38999 circular connector for Ethernet applications

A MIL-DTL-38999 connector based on insert arrangement has a different service rating (M, N, I and II). Service rating of M shows a suggested operating voltage of 500VDC (pin to pin and pin to shell). ...
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1answer
77 views

How in-depth is the IPC “Introduction to Printed Circuit Design” course?

I'm looking into courses to progress from autodidactic hobby-level PCB design. IPC is offering an "Introduction to PCB design" course. How well does the course cover the standards? IPC-222x, IPC-7x51,...
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1k views

NEC Ampacities Data

This data shows the Allowable Ampacities of Insulated Conductors Rated 0 to 2000V, for Copper conductors, as listed in the NEC NFPA 70E Table 310.16, used for estimating the current ratings for power ...
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4answers
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What's the difference between these diode symbols?

What's the difference between these three different ways of symbolising a generic rectifier diode: solid, outline and outline with connection between anode and cathode?
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2answers
277 views

Misra C or other code standard compliance in TI CCS

If I need to do Static Code analysis of my code or check for Misra C compliance for my code in TI's CCS for MCU RM57 then how can I do that? I can see 'Code Analysis' in the project preferences but I ...
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1answer
45 views

Do enclosed switching power supplies follow any standard for their chassis size and mounting hole distances?

Do enclosed switching power supplies follow any standard for their chassis size and mounting holes distances? or each manufacturer has its own conventions?
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1answer
210 views

ATEX: PCB design for intrinsically safe, output capacitor

We're looking into restricted breathing or encapsulation concept because PCB has a complex circuit that makes it impossible to achieve SMD clearance under 'ic' or increased safety concept. I have a ...
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2answers
192 views

What is the origin of the standard 0.1 inch pin pitch?

I'm curious which company started using the standard 0.1 in (2.54 mm) pin pitch for components. This is surprisingly difficult to Google. I see 1956 and Cicoil Corporation when it comes to ribbon ...
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1answer
102 views

Where to measure ambient temperature limit inside of an enclosre?

In a project, we are to place several components inside of an enclosure. Some of these components are to be considered safety critical, and their specified operating conditions must not be exceeded. ...
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289 views

DDR Interface Protocol

I have seen and worked with interfaces like SPI and I2C. However, when I started to learn about DDR interface/communication protocol, I want to understand like how many lines, what are the important ...
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59 views

Standard Meaning/Purpose of Exposed Areas on a PCB?

I noticed that on some circuits, there will be dots or rings of exposed circuit material. Take for instance the back plate of a Nest thermostat: https://d3nevzfk7ii3be.cloudfront.net/igi/...
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73 views

4 Channel NOT and AND Gate Symbols

I am designing an ALU for my computer architecture class. The rubric states that we need to simplify each logical part to make it as clear as possible. My group condensed the 4 NOT gates and 4 AND ...
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2answers
351 views

What (if anything) are the standards for “generic” part numbers?

If I buy an MMBT4401 from Diodes, Inc., I get a 40V, 0.6A NPN transistor in a SOT-23 package. If I buy an MMBT4401 from ON semiconductor, I get a 40V, 0.6A NPN transistor in a SOT-23 package. If I buy ...
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1answer
112 views

How do I Avoid Very Long Horizontal Signal Path “Snakes” in a Schematic?

I'm drawing a schematic for my DIY project, a RF mixer, it has a local oscillator followed by a bandpass filter, a voltage divider, eventually the signal is fed into a mixer. Unfortunately, even ...
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3answers
331 views

0-10V on RJ45 jack - bad practice?

I'm developing a control unit for ventilation systems. Beside switching those fans with a relay they are often controlled with a 0-10V analog signal. Now I found a product that uses a RJ45-plug to ...
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3answers
67 views

Electrical Standards - Earth Wire at Low Voltages?

I got a question about safety standards: I'm designing a consumer device and I'm not sure whether I need an earth wire. I have an AC-DC converter plug that outputs 5 V and up-to a maximum of 1 A ...
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98 views

How to know what is the safety standard to apply to a PCB design?

I want to design a PCB with some points at some KV during certain times, less than 10KV and no more than 30mA of current. After dealing with concepts and getting the main idea about my circuit needs, ...

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