Questions tagged [units]

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61 views

What does Nu (ν) prefix mean?

Stumbled upon this in ZVN4525E6 datasheet: Zero Gate Voltage Drain Current (IDSS): 35 νA @ VDS = 250V, VGS = 0V The letter is U+03BD and it is not in any common unit prefixes that I know. My guess ...
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1answer
31 views

Units of PID for car' velocity?

I'd like to duple check from units of PID gains for the velocity of car. This my equations for PI controller V (m/s), kp (1/sec), ki(1/sec^2), kp' (radians/sec) , ki' (radians/sec^2) and kd (no unit)...
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2answers
70 views

What is the meaning of VFS

I am working with a Dataq DI-1100 whose specs tout: "The analog inputs offer a fixed measurement range of ±10VFS..." VFS looks like a unit, but I find the language confusing. Researching turns up ...
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2answers
83 views

How to convert between G and mV/g of sensitivity?

I cannot for the life of me understand how mV/g or LSB/g can be related to the g sensitivity. For example, how can I find 0.0025 G sensitivity accelerometer given the sensitivity in mV/g? I haven't ...
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2answers
67 views

analog values to ppm

How to transform a set of analog voltages from V to ppm/K? I have to use this to calculate the temperature coefficient of a bandgap. Is the derivative the same as the temperature coefficient ...
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0answers
65 views

Why is the Farad unit so large? [duplicate]

I have wondered this on and off for years, and was prompted to find out the answer: Any time I've seen capacitors, they're listed with milli- or pico-Farad ratings. I understand that, nowadays, we ...
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3answers
127 views

Compare white LED radiated optical power: lumens vs milliwatts

I'm trying to compare the brightness of various white LEDs, some of which are listed in lumens and others in milliWatts (this is milliwatts of optical output, not watts of electrical power consumption)...
3
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3answers
174 views

Inconsistency in Values of Laplace Transformed Current when Changing Units

I was trying to convert the units of the following current in Time Domain and Complex Frequency domain (s-domain): $$ i(t)=20\cdot e^{-t}H(t)\,\,\,\,\,\text{[mA,ms]} $$ Where \$\text{[mA, ms]}\$ ...
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4answers
1k views

What units are kpts?

I am parsing data from a Siglent SDS2000X oscilloscope. The first chunk (0x00 - 0x003) is for wave_length. The data sheet ...
0
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2answers
53 views

Can I represent the value by using this unit [closed]

I want to represent this value in a better way for my report. This value is 3.1x10^-4 the unit is dBi Can I rather represent this value using this: 310 udBi The u in udBi is micro dBi
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1answer
49 views

What are the units when solving Transmission Line iterativelly?

I would like to know the conductancee,\$C\$, and capacitance,\$G\$, of my lossy transmission line which is configured as an open circuit. In such a case, I know that the expression that defines the ...
0
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1answer
961 views

Altium designer, changing from imperic to metrics primitives won't work?

I'm using a trial on Altium, where for I guess support ignores me (Altium Designer version 19.0.14). (I really hope it's better for real users if someone can confirm that, it would be most ...
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1answer
112 views

Definition of \$ \frac{mm}{Ampere}\$ (unit of current sensitivity)?

I want to know how \$ \frac{mm}{Ampere}\$ (which is the unit of current sensitivity of PMMC instruments) is defined? i.e, How \$ mm \$ is defined in terms of \$ degrees\$ ? For eg.: \$ \frac{rad}{...
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2answers
139 views

What are these designations on a sensor datasheet?

I'm working with image sensor Anafocus Lince5M. In its datasheet there are some designations that I can't understand (underlined). What are these designations? And how to calculate threshold ...
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2answers
293 views

\$pV/\sqrt {Hz}\$ in Power Spectral Density

I am trying to plot a Noise Spectral Density from 10 kHz to 1 MHz. The Graph shows a cure which at 1 MHz the noise is 76 pV/rootHz. I am unable to understand that unit definition here. Becuase the ...
5
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2answers
532 views

Units of BJT parameters

Let's say the model is the Ebers-Moll model, but this obviously extends to other models: $$ I_{\mathrm{b}} = \frac{I_{\mathrm{s}}}{\beta_{\mathrm{f}}}\left(\mathrm{e}^{\frac{V_{\mathrm{be}}}{NV_{\...
1
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2answers
226 views

SENT protocol output unit is LSB. What does this mean?

I have read couple of datasheet of devices which uses SENT protocol. They define the output between 193 and 3896. The unit is LSB. I think that this does not mean least significant bit? Example: ...
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0answers
734 views

How much maximum electricity bill (units) can be generated on 2 KW connection?

I have got a bill of approx 14000 Units (50000 INR) for a month on 2kW connection. As per my analysis and understanding, it can't be more than 2 * 24 HRs * 30 Days = 1440. I think electricity meter ...
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2answers
148 views

What other units can influence the way a wire glows than watt? [closed]

I have a vape device with a mod that lets me configure the power I want to operate it with and also as an additional setting that is called vape strength which can be set to soft/medium/hard. When ...
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0answers
31 views

Pulse width modulation and textual expression of resulting stimulus level

So we have been using pulse width modulation (PWM) as a means to digitally change the driving voltage of vibration motors. Usually, afaik, the resulting voltage from PWM is expressed as %duty cycle ...
4
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1answer
573 views

Why do so many PCB-designers use non-metric units? [closed]

TLDR: Why do so many PCB-designers use non-metric units? Sorry for asking this closed question again: what is the advantage of non-metric units But I do not understand, and there is also no other ...
0
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1answer
145 views

What's the difference between measurement resolution and digits per second in time measuring devices

In time/frequency counters/analyzers in technical specifications you can almost always find resolution and digits per second values next to each other. What is the difference?
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2answers
77 views

What is the unit of measure for a region's power supply?

So, I'm casually perusing an old issue of Foreign Affairs magazine and encounter a paragraph concerning the ability of Brazil's electrical power generating plants to supply juice. Said paragraph ...
0
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2answers
65 views

Energy Consumption of AC Motors with same capacity and same hp

I have 2 3-phase motors with same capacity of 45kW, hp 60,rated Voltage is 415V, VFD 55kW connected separately to a Vessel Line that is used to mixing of few components.i.e, it looks like this. (I ...
1
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1answer
258 views

Altium Symbol Wizard only in imperial

We have now got Altium 17 installed and set up, and I've used it to make various schematics. One feature of the software is the Symbol Wizard for creating our own symbols for different components. It'...
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3answers
5k views

Convert VAh to kWh

Sorry, this might be a stupid question as I'm not an electrical person. I'm analyzing an electricity consumption dataset and the consumption is measured by apparent energy (VAh). How do I convert ...
6
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1answer
357 views

Olympus TG-Tracker : What does this data stand for?

I'm sorry if this comes to wrong forum, but here goes. I got this new action camera which tracks the following kind of data (edited): ...
0
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1answer
83 views

What is a term for voltage that does not involve the unit?

Basically the title. What is the term that means the same thing as "voltage", but does not invoke a specific unit (in this case, volts)?
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3answers
281 views

Joule-hour is Watts * 3600?

Maybe this is a dumb question, but I am trying to get my units straight. I have an electrical system which has its consumption metered every hour, so I need units that are graduated in hours. So, ...
1
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4answers
398 views

Sealed, long, thin glass tube with two wires and tiny filament - what is this?

I found this thing, and have no idea what it is. The tube is 30 mm long, about 5 mm in diameter. Both terminals are connected with two drops of glass. There seems to be a tiny wire or filament ...
1
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1answer
414 views

Is there a common message protocol for sensor data on top of MQTT-SN?

I want to communicate various sensor data in a network of sensors. I found MQTT and MQTT-SN as suitable protocols for that. The latter being better suited for sensor networks with support for ...
2
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1answer
849 views

Watt-squared-seconds: unit of safe operating area?

In the datasheet of Linear's LTC4364, page 15, the safe operating area (SOA) of a MOSFET is described as: For short duration transients of less than 100ms, MOSFET survival is increasingly a matter ...
6
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1answer
527 views

Help identifying resistor with arrow accross and capacitor with unit “kp” or “k” or value “5/6”

Can you please help me identity these symbols from a vintage (1960) diagram? The capacitors units are noted with "KP", sometimes just "K". What is the rectangle crossed with an arrow? It looks like a ...
0
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1answer
7k views

Testing an X2 capacitor with a capacimeter. Is it broken?

This came up as a comment in other question I posted, but I thought it could be of use for someone else if posted separately. I have an X2 cap rated ".47K275V~X2". Is that ...
2
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3answers
2k views

SI derived units: Another name for the Volt [closed]

\$ V = \frac{Kg \cdot m^2}{s^2A} \$ I know it's basic but I was having a hard time understanding the relationship between volts, ohms, watts, amps and ohms until I broke everything down into base ...
5
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2answers
27k views

Transform pulses per second (pps) to rpm

I have a stepper motor that turns at 5000 PPS and has a step angle of 1.8º. What would be the formula to transform these pps into rpm? Thanks in advance!
1
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2answers
1k views

What are the units in which a radio signal's strength is measured?

I'm kind of confused about which is the most correct unit when it comes to the measure of wireless signal's strength. It seems that the correct unit is V/m (usually expessed in dBuV/m), however it ...
7
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4answers
1k views

Misconceptions about PID Controllers

I'm currently designing an equivalent of the mass-spring-dashpot system, and during the design phase I realized I don't fully understand how PID controllers physically work. Below is an image, the ...
1
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1answer
377 views

AL value: nH/N² vs. nH/T²

I'm in the process of sizing some toroidal ferrites. My problem is that I am seeing the AL value on the datasheets shown two different ways as nH/N² or nH/T². Are these two units identical? I believe ...
4
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1answer
14k views

Which is correct, kohm or kOhm?

Should the unit "Ohm" be capitalized or not? For example, "kOhm" versus "kohm" vs "kΩ", which is most correct?
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2answers
6k views

What does “ku” or “kU” mean with regards to procuring ICs? (not about RF)

NB: This is not referring to RF subject matter. I'm seeing 1ku and 10ku on procurement documentation for purchasing motor driver ICs (TI DRV8811 and some others). Does this mean "one-thousand units"? ...
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1answer
867 views

Meters per square root hertz [closed]

Looking at some ESA papers I found an unit that I don't know, picometers per square root hertz. Anybody could tell me what this unit is for? Thanks!
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1answer
241 views

What is the advantage of non-metric units? [closed]

Why are non-metric units so widely used in elctrical designes?
0
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1answer
4k views

dB A and dB Z (or dB SPL) Table

Does anyone have a detailed dB A to db Z (or dB SPL) table? I have found one at http://www.cirrusresearch.co.uk/blog/2011/08/what-are-a-c-z-frequency-weightings/ and at http://onlinelibrary.wiley.com/...
1
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1answer
2k views

Output Units of Soil Moisture Sensor

I have an Octopus Soil Moisture Sensor connected to a Rasberry Pi through an MCP3008 ADC chip. The sensor is working correctly, but I have no idea what the reading values mean. I say its working ...
2
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1answer
155 views

Is it correct to use “wattage” and “amperage” instead of “power” and “current”?

Is it legitimate to call the name of an electrical quantity with the name of the unit of that quantity by adding the -age suffix to it? Examples: ...
29
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6answers
6k views

What kilogram is doing in volt unit definition?

My question is inspired by this: Why do farads multiplied by ohms produce a result that has a unit of seconds? I want to ask what kilogram is doing in this equation: $$\mathrm{V = \frac{kg \cdot m^2}...
4
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2answers
194 views

What's this 't' unit on a PCB?

I recently came across a symbol like this on a PCB: (forgive the use of Paint) The component was marked as being 0.1 (symbol). You can just make it out in the centre of this photo: It's a capacitor,...
2
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3answers
6k views

How can the SI unit of resistivity [Ωm] be interpreted?

The way I interpret the resistance \$R\$ of a resistor, which has dimensions \$ [\frac{\mathrm{V}}{\mathrm{A}}] \$ is: how many volts must be applied across the resistor to achieve 1 ampere of current?...
3
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3answers
5k views

What is the unit V/V?

I came across this when I was browsing through the data sheets for a current sense amplifier such as the LT6100. It reads: "Fixed gains of 10, 12.5, 20, 25, 40, 50V/V are obtained by simply strapping ...