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Questions tagged [standard]

The tag has no usage guidance.

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0answers
57 views

Why is in-DRAM-computing not a standard part of PC architecture? [on hold]

The (impossible) holy grail of PC architecture would be to allow any core to execute any instruction, on any random byte, anywhere in DRAM, in parallel. Since this is not possible, we instead have ...
1
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0answers
63 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 ...
0
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0answers
53 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 ...
1
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2answers
116 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
38 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 ...
0
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1answer
70 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
38 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
103 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
50 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 ...
0
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0answers
39 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
465 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
29 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
37 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 ...
-1
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2answers
89 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
30 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
111 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....
0
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0answers
11 views

What range of power factors is used to test electricity meters under ANSI C12.20?

ANSI C12.20 is the standard used in the U.S. for electricity meters. In the contents and scope (pdf) I see that test number four involves varying the power factor of the test load and observing the ...
3
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4answers
244 views

Is the USB B connector still standard?

Nowadays, There are several kinds of USB connectors for USB connection. A type B type micro-B mini-B USB C Etc. The connector sizes are gradually smaller than before. It is a big advantage because ...
14
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1answer
2k views

Official GPS protocol documentation?

Searching for "GPS protocol" reveals many sources for processed GPS data, e.g. NMEA or binary outputs of GPS units. Where is the official documentation for the GPS satellite - receiver protocol? Or ...
2
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0answers
69 views

Is there any standard (or even a de-facto standard) for TRRS to USB? [duplicate]

I've had a few MP3 players that used a single 3.5mm TRRS jack for both connection to earphones and for connection to a USB port (for transferring music files and re-charging the player.) To that end, ...
0
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3answers
215 views

Standard ways to make a variable low pass filter

I tried out a basic low pass filter on one of my analog synthesizers: simulate this circuit – Schematic created using CircuitLab and this seems to work. I was wondering how I can create a ...
1
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1answer
88 views

EN 50121-3-2:2016 radiated immunity frequency range gap

I was just reading EN 50121-3-2 (Railway Applications – Electromagnetic compatibility – Part 3-2: Rolling stock – Apparatus) and noticed in Table 5 that there is a gap in the test frequency between 2....
7
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1answer
187 views

Are Ethernet (copper 10/100/1000) compliance tests mandatory?

The IEEE 802.3, for Gigabit Ethernet, and supposedly the ANSI INCITS 263*, for the Regular and Fast Ethernet, have lists of signal quality requirements, which are generally tested using the so-called ...
0
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1answer
65 views

Transfering configuration to IEDs using IEC 61850

Sorry if this is a dumb question, but since I don't have much experience with IEC 61850 compliant devices, I am having trouble creating the "big picture" of how the whole system is being configured in ...
-3
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1answer
43 views

Tail biting Convolution Encoder

I understand how encoder and decoder works but what are theses values ??
1
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1answer
107 views

Why do many resistor kits deviate from E6/E12?

I noticed that the resistor kits I've seen appear to be based on E6 or E12, but they skip certain values in favor of near neighbors. For instance, the 1000 decade of my kit contains: 1k, 1.2k, 2k, 3....
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2answers
102 views

Red for hot, blue for cold - or vice versa?

Just wondering if there is any standard way of using LED colors to represent temperature. I have a board connected to a Peltier. When the active side (not heat sink side) is heating, I turn on a red ...
0
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1answer
77 views

Power over coax standard

We are specifying a system to use power over coaxial cable, that will transmit SDI video. Is there any standard (IEEE or otherwise) for implementing it?
1
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2answers
162 views

UL/IEC-60950 Standard Question

One of the requirements I need for a device is to meet the UL/IEC-60950 standard. On the companies website I am looking at it mentions that "products are assembled and tested in company’s own ISO9001:...
0
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3answers
149 views

Why does my router have a power on/off switch? [closed]

I have to develop a consumer product for home automation. We initially wrote a requirement to have a on/off switch, but after a second thought we realized that hard-reset can be done by simply ...
1
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2answers
83 views

Are these AC wires in this cable swapped?

(I am located in the US) I'm taking apart a cable to use for AC in a project. When I stripped the ends, I saw the expected Black/White/Green colors to indicate hot/neutral/ground respectively. ...
0
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2answers
262 views

DC power jack socket footprint

Is there a standard that all DC power jacks follow? More specifically, I plan to use 5.5/2.1 mm barrel, and I've found a bunch of these components on eBay, but they all lack drawings (not to mention ...
0
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1answer
66 views

What is protective bonding (PB) and protective earth (PE) in IEC terminology (fx 60364 and 60204)?

I understand the basic/overall meaning of both, just as well as my electrician co-students. However, I really would like some more precise definitions than what I have been able to find so far. I find ...
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0answers
42 views

Where do hi-pot multipliers come from?

I am researching AC vs. DC hi-pot testing. According to UL 508 and IEEE 421.3, a hi-pot test should, among other things, subject the unit under test to 1000 volts plus twice the rated voltage of the ...
1
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2answers
127 views

Difference between LVDS and “Low Power LVDS”

It sounds like a double emphasis but indeed, pin 25 of the LTC2323 (http://www.linear.com/product/LTC2323-16) I lets me choose between: CMOS (GND) LVDS (IOVDD) Low-Power LVDS (leave floating) As ...
1
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1answer
65 views

What is the connector shown in the photo?

Is the connector marked as CN3 in this photo a standard one? If so what is it called?
1
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1answer
47 views

Presenting Built-In Self-Test Coverage

I have a piece of code that performs self-test on various components of the board, like MCU, BLE, IMU, OLED, flash memory, and etc. What I'm trying to make is a document that would represent what ...
0
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1answer
121 views

Strength of connector attachment to PCB

Is there an industry standard or MIL-STD that specifies the force a connector needs to withstand before coming off a PCB?
0
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0answers
57 views

Current rating standard

Is there a non-mil-spec standard for wire current capacity? Application info: the wires are bundled eight circuits (only two at 2A) in a small volume, carbon tubes, with no airflow, and the ...
0
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0answers
965 views

Where is the Intel Common Redundant Power Supply (CRPS) Standard Specified?

Intel server reference designs use the Intel Common Redundant Power Supply Standard (CRPS). These documents include a brief over view of CRPS with information like the pin names and refer the reader ...
2
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1answer
156 views

Designing single fault safety into class I device

I'm trying to wrap my head around safety standards for electrical equipment. My device is medical, so for me section 8 of IEC60601-1 is what really matters to me, but it's kind of my understanding ...
1
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0answers
222 views

What is the current status of RDS 2.0?

Radio data system is the standard used for embedding small digital information in FM radio. I am excited for the release of the new RDS 2.0 standard. But I am not really sure if the technical standard ...
5
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2answers
167 views

Why batteries need to be custom and smart nowadays?

Recently I refresh a laptop battery with new 18650's. This is working however it still doesn't last very long because of the chip inside this battery. The chip must recallibrated (data is incorrect ...
2
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1answer
298 views

Is there a color code for relay housings?

I have noticed that most relays have plastic housings that are white/natural, black, or orange. I have also seen blue, green, and clear housings. I am wondering if there is any meaning associated with ...
0
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1answer
74 views

Certifications and Standards [closed]

I am looking to import machinery (CNCs, extruders, presses etc.) from China to use in my own factory for a specialized production in the USA. Machines are produced by smaller shops in China without ...
4
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4answers
26k views

Australian 3-Phase Colour Code Standard

We're ordering some machinery from China and need it manufactured to Australian electrical standards including the wiring colour code. Unfortunately we don't have any electricians or engineers that ...
0
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1answer
40 views

What is the relevancy between the actual full load current value (test result) and the supposedly corresponding values from industry standards?

I work on evaluating a motor problem. If I am given an actual current at 100% full load, how does an industry standard value become relevant? I have an example to illustrate the point I am trying to ...
0
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2answers
1k views

What is standard about standard cells in layout designing? [closed]

Why are standard cells called 'standard' cells? Why couldn't it be just cells? What is Standard about them? (I'm talking about the common terminology used in layout designing wherein the standard ...
3
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1answer
70 views

How do I find JEDEC registered specifications?

If I'm sharing a circuit for educational purposes, I want to make sure that my parts are common generics. I'd much rather specify "2N3904" than "ON Semiconductor MMBT3904". But not all 2N3904s are ...
1
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1answer
100 views

Transistor according to EN 60617-2

German Wikipedia lists Transistors according to EN 60617-2 with the symbol I wonder whether this symbol is correct, or it's actually the old one. I don't have the standard available, but in most ...