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## Problem with unbalance detection in three phase system

Do you mean the problem is with power grid that supplies 3 phase?! When I measure phase voltages there is little difference between them! and 3 resistors also are equal.

## Power Electronic Devices for both AC and DC loads!?

Hi, * define "fast". Is it ms, us, ns? * isolated or not * inductive loads * functional switch OFF, or safety switch OFF * AC = mains frequency? Is it to protect the load, or your electronics? If AC, and RMS current.... how do you measure RMS current that fast? Or don't you use RMS to decide when to switch OFF? Klaus

## Gate to Source Voltage Shift

How do you measure the power when you plug your load to the amplifier ??

I am working on a project where I need to measure the current drawn by multiple loads from a single power supply using a 8-bit PIC micro-controller. Also, when an overload condition is detected in any of the loads, I need to cut it off using a MOSFET. Here, each port is limited to a specific current and the (...)

## Assuring stability of SMPS power module?

I suggest you start injecting signals into an active load and monitor V,I for gain phase stability. You can get a sweep generator from Audacity, and use the audio inputs AC coupled as required to measure the response in time and frequency spectrum, or use scope for unity gain and measure phase margin, 130795

## capacity of wcdma system

hello i am really needing urgent help i need to optimize the transmit power and measure the load of the cell (number of served user) so the measurment show how the power increasing increase the number of served users anyone can help me with any law ?and is it possible to use shannon capacity law as simple solution ?and (...)

## measuring impedance using spectrum analyser

i do not have a network analyzer, but i want to measure the input impedance at one of the sma connectors of my ic(supposed to have seen 50 ohm). i have seen some post which can give a basic idea about the matching but they all require tracking generator but is there any other way by which i can see whether the impedance is around 50 or not. (again

## how to measure line to line voltage in pic micro

i want to measure line to line voltage that is 440v ac across r and y , y and b , b and r using resistive voltage divider method. i am scalling the voltage to 1.2v max. the problem is if any phase fails the voltage is not becoming to 0 in reduces to half how to solve this using resistive methord

## How to calculate power dissipation in ADS?

PAE = Pout - Pin/Pdc in order to measure power at output and power at DC, you need to add current probe at the load and DC points respectively. for voltage measurement just name the not as VX will do. insert the equation in schematic so after simulation, you will get the values.

## RTC Time is Lacking within 15 days by 2 minutes to 8 Minutes

Hi we are using the 32.768 KHz crystal in the PCF8563 RTC circuit. we are using 3.3VDC supply and CR2052 (3V lithium Battery) using BAT54C ORing Diode module. if we measure the frequency at the crystal points we will get the 32.768 KHz . But the Time Lacking is there. Please give some suggesstion to come across the problem. Thanks

## Current measure using CT

I have a Current Transformer for 10Arms rating with 1:1500 turns ratio. I'm not familiar with it. In Current transformers the specifications will be in primary current to secondary current ratio, but here the ratio is in terms of primary & secondary turns ratio. 1. How to calculate the current ratio from turns ratio? 2. Is it 10 Amps differ from

## Prevent audio leaking

say again? How much level? and where did you measure this? What power source was used? impedance?

## Synchronous Buck converter DCM/CCM efficiency comparison in light load condition

Hi everyone, I designed a synchronous buck converter with the zero current detector (ZCD) to have a option to select between CCM/DCM at light load condition. The control method is traditional voltage mode PWM and no pulse skipping/PFM in DCM mode. At first, I thought the efficiency is always better in DCM mode during light load but surprising

## Trouble with bridged TDA2050 and single supply.

AC supply probably has lots of 100Hz ripple. measure it with no load and full load signal. Each power amp is probably oscillating above 100Khz causing overheating. If it gets hot with no load, put 2.7Ohm 0.47uF as indicated in specs or similar series snubber on each output to ground. If DC out is not (...)

## Queries regarding on the transconductance of the device and current buffer

(1) The transconductance is a measure of how much output current you get for some change in the input voltage. E.g. lets say that you change the input by 1 mV, on a FEt of transconductance 1mS. The the output current (the current through the drain of the FET) will simply be 1mV x 1mS = 1uA. The noise that a transistor produces is directly related

## DIY Power Amplifier load tuning

A 3 dB hybrid splitter will normally lose 3.5dB but <1dB when 1 port is unloaded such as with a high impedance diode cap forward or reverse power detector. Return loss performance is adjust if loaded correctly. But then you can use it as a directional coupler to measure effects of variable load on (...)

## construct power system using PSCAD?

Hye everyone :) How to construct this diagram using PSCAD? And how to measure the bus voltage, power and reactive power at load busses etc? Thank you 110818

## Inserting a variable resistor into a DC circuit

3. You can modify your computer power module to reduce its voltage with external resistor and add voltmeter to measure it.

## Power Supply Output Dropping till 0

Hi All, I have a power supply with multiple outputs. 12v, 5v, -5v. When I power up the unit. I can measure the output voltages but its dropping very fast, from 12v drops to 0, from 5v drops to 0. Anybody knows the possible cause? I already changed the filter caps but still same.. Thanks in advance!