Questions tagged [standard]

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26 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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0answers
70 views

Where to find standards for SMPSs [closed]

I am working on a project that includes a Switch Mode Power Supply. I need some numbers, ranges, for safety reasons and beacuse I want to use it equally as other devices and with other devices plugged....
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1answer
12 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
81 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
41 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
37 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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0answers
44 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]: $...
7
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2answers
534 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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0answers
49 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
54 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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0answers
67 views

Is there a tool or standard for generating C drivers from a register description

Is there any general standard for generating drivers for register-mapped devices? I believe the vast majority of devices which communicate over I2C/SPI use register access as the mode of interfacing....
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0answers
30 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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2answers
100 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
188 views

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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0answers
15 views

How to do the Leakage Current Test according to ULC S531 standard?

How to do the Leakage Current Test according to ULC S531 standard? I have a DC powered device which is about 24V. And I am curious about the Leakage Current Test according to the ULC S531 standard. ...
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2answers
101 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
36 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
66 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
156 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 ...
4
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1answer
56 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. ...
0
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2answers
139 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 ...
0
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1answer
40 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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2answers
69 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 ...
7
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2answers
312 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
107 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
140 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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0answers
93 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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2answers
80 views

What general purpose connectors are used for GPIO data? [closed]

Let's say I have a chassis housing a raspberry pi. I have a second chassis with some neopixels. I want to connect these two chassis with two panel mount connectors and a cable. The cable would be ...
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0answers
65 views

Standards for colour of conductors of pre-assembled cables

We are designing a product for industrial energy storage systems. Multiple units are connected with pre-fabricated cable assemblies of 2-4 separate leads that are terminated in connectors unique to ...
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2answers
68 views

Should a D Flip Flop store its input on clock rise?

I've seen conflicting descriptions and conflicting implementations of D Flip Flops, when it comes to how the Flip Flop behaves when its input value changes at the same time the clock rises. ...
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0answers
9 views

How is n_pucch_2 in rrc layer computed

In LTE network I know that n_pucch_2 is used to indicate the resource index for pucch format 2/2a/2b. And I know its value is defined in higher layer. But how is the value computed and defined in the ...
3
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1answer
179 views

How can be creepage between two conductor points be determined for HV pcb design?

I have read about spacing at HV design and it seems to say that there are two main standards to be followed: IPC or UL (IEC). IPC is a generic and commonly used. But UL is the best option for designs ...
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2answers
44 views

Adjacent Signal Selectivity: Section 6.1 of ETSI EN 303 372-2 (RED testing). Bad procedure/standard?

I'm doing pre-certification testing to ETSI EN 303 372-2 V1.1.1 (2016-04), specifically the Adjacent Signal Selectivity test in Section 6.1. I am a Systems engineer with lots of experience designing ...
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2answers
778 views

Phasing Order in IEC Color Codes

Currently, IEC 60445 international standard is used for conductor terminal color identifications. I've obtained different versions of the standard (2017 being the latest) and also IEC 60446, which was ...
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0answers
70 views

How do you plan and check if a device will be compatible with every other device it will encounter in the field?

Hello I have a question that hopefully I can clearly state my question well enough. I work in television broadcasting and simply take off the shelf converters that take various signals and convert ...
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0answers
72 views

Does anyone know the UL standard related to resistors and isolation on AC mains?

I have a circuit that is attempting to measure AC line voltage 120-240V but I was told by the certification test lab that my voltage divider resistors would require an expensive 3 week soak test. The ...
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2answers
278 views

Is RoHS and EMC compliance enough for a 24V industrial sensor to carry CE Mark?

My company is planning to produce a fork sensor (example). Before starting design, I looked up EU Directives to find if there are any electrical requirements for product safety. First stop was Low ...
0
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1answer
128 views

Design Item ID standardization

I am wondering whether there is a solid standard on how to give components an unique identifier. In Altium it is called a Design Item ID, and in our company we used it as a unique identifier on the ...
1
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1answer
954 views

Are connectors and pin outs standardised by the MIPI alliance? [Also can anyone name this connector]

Does the MIPI alliance standardise or are there at least any conventions for connectors and pin outs between devices that use there protocol specifications? The device I am interested in (Microsoft ...
0
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1answer
54 views

Standards for conducted EMI testing

I have some doubts to interpret the CISPR standards, one of them is in relation to the test environment for EMI conducted (150kHz up to 30MHz). The minimum size indicated for the vertical or ...
1
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1answer
114 views

Why do commercial components have a temperature range of -40 to 85c?

Why not -50 to 90? How was the temperature range of -40 to 85c chosen to become the industrial standard? (Some products may have a different operating temperature range, but for the majority, the ...
5
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1answer
64 views

How to determine which harmonized standards are relevant to achieve CE conformity declaration

We are aiming to develop our first product to achieve a CE marking. So far i understand that there are a few directives like Low Voltage Directive (LVD), ROHS, EMC, etc, which can be implemented by ...
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0answers
41 views

Electrical safety measures in LED bulbs for the European market

Which electric safety measures are required to introduce LED bulbs on the European market? Which electric measures prevent that the plastic LED bulbs will melt down or ignite at the end of life? I ...
10
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2answers
767 views

‘One for all’ standardized land pattern v.s. specified land pattern in datasheet

I’ve designed lot of ‘simple’ PCBs for hobby and proof-of-concept purposes, but never for (mass)manufacturing. In order to do so in the future, and further expanding my design skills and knowledge, I’...
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0answers
34 views

Thread pitch on locking 1/8" audio connectors?

I feel silly that I can't find this on Google... what is the thread size on locking 1/8" audio connectors like these? There seems to be a de-facto standard, but I can't find any numbers and it's hard ...
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0answers
68 views

Interoperability between regular and single-wire CAN bus

Is it possible to connect a regular CAN transceiver (ISO 11898-1) to a single-wire CAN bus (SAE J2411) in a compatible way? By "compatible" I mean that the whole system should support valid J2411 bus ...
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2answers
118 views

PS/2 mouse / keyboard interface info and classification

My hardware interfaces teacher in the university gave a task to find info about PS/2 interface and fit it into a classification by answering a list of questions. Here's what I've found: Which type ...
1
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1answer
57 views

IEC 61952 Clause 11.1 Electrical Type Test

Where can I find the acceptance criteria for the Electrical Type Tests? Specifically, where is the Dry lightning impulse withstand voltage test and the Wet power-frequency test in the IEC 61952 Ed 2.0 ...
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1answer
122 views

Light source that withstands extreme conditions [closed]

I am designing an aircraft obstruction light, and Federal Aviation Administration (FAA) requires crazy requirements for their standards. One standard goes as following (From FAA AC 150/5345-43H): 4....