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# Multimeter Circuit

93 Threads found on edaboard.com: Multimeter Circuit

## SMPS input current measument

Hi all, This is Mohan, Actually i tried to measure input current of smps(3 phase input), to make smps automation circuit,we have used a 1 ohm resistor to the the series of all the three phases of smps ,normally when i measure in multimeter i saw 40mA at the smps input when i measure(voltage) across the 1 ohm resistor i got 0.04v so when i use f

## RC Snubber for BTA26-600 Interfaced to PIC16F73 for AC Single phase motor control

With the snubber of 1nF/250V(shown by multimeter) and 1.5Kohm is not allowing the PIC to control the motor Your schematic is showing a different circuit. Anyway, which behavior do you exactly observe? 1 nF is about no snubber. Think about capacitors in a 47nF to 220 nF range. As an additional point, the crossing detector in yo

## How to perform DC channel estimation

Hi everyone, I'd like if someone can help me to understand how to perform the DC channel estimation in terms of noise, interference etc with some instruments (multimeter, spectrum analyzer..) of a car. I thought to make these measures using the cigarette lighter of a car to sense the entire circuit. In a few words I need to "see" how i

## How to perform DC channel estimation

Hi everyone, I'd like if someone can help me to understand how to perform the DC channel estimation in terms of noise, interference etc with some instruments (multimeter, spectrum analyzer..) of a car. I thought to make these measures using the cigarette lighter of a car to sense the entire circuit. In a few words I need to "see" how i

## What is wrong with this radio circuit

A diode in series with a capacitor cancels the diode current. Operating a 200 MHz OP without any bypass capacitors is really a bad idea. Generally you'll start verification of circuit by measuring all DC levels (e.g. against common ground) with a multimeter.

## Kaise SK-6111 help needed

Reference existing thread: hi I need kaise sk6111 circuit pic or schematic for repair this digital multitester - I need 1 pic from front and back of this multimeter

## Simple constant current source question

I have to agree with Bob Pease (who am I to disagree :0) ) , breadboard testing is a must. I built the circuit last night. Worked surprisingly well , probably not far off the simulation. I did't have a high quality multimeter with me to accurately measure uA accurately though. Will take a better meter home tonight and try and do some accurate meas

## How to achieve 5A short circuit and maximun current for series voltage regulator?

106337 The figure shows multimeter at the output is in Ammeter mode which i think it functions as short circuit for the system. Referring the picture, I attached. I have designed a series voltage regulator that can convert AC source to DC source (range from 0 - 20V). However, I could not achieve 5A maximum curr

## Measuring total current used by circuit with multimeter problem

You won't get a reading with blown fuse. So more likely it's just multimeter voltage drop. Measuring current directly at the battery terminals should work better.

## AC Voltage Measurement Error

Hello Every Body, I am making a voltmeter that can measure the AC voltages from 0 VAC to 115 VAC accurately using microcontroller. Below is the circuit for converting AC to DC for microcontroller. I am using my multimeter to cross checking my voltmeter. Now I am having a problem that when I increase the AC voltages l

## WTA how to calculate the the battery life span for a circuit ?

You cannot calculate the current used by the buzzer. Its datasheet tells how much current it uses at a certain voltage or you can measure its current with a multimeter.

Did check voltage levels with an oscillocope or average values with a multimeter? Did you verify correct supply voltages? Would be better to see a schematic.

## simple circuit to detect a short circuit?

Like the buzzer in the multimeter to detect if a wire is ok or not it should beep if the resistance between the probes less than 60 ohms thanks

## Dell XPS M1330 Mainboard problem

Do you know electronics? Do you have instruments to check the circuit? such as oscilloscope, multimeter, logic probe etc. It seems you still have something shorted. When you connect the battery, connector over heats means you still have short somewhere, something draws a lot of current, you have to troubleshoot to find out what is causing that, whi

## Any idea if this circuit attached to the MCU pinout is correct?

97325 Hi. The attached image is a section of a Car Parking Assist device. Not sure if it is correct but I traced the connections on the board from the MCU pinout to the data out pin of the device using a multimeter. I am not 100% sure if the transistors are BJTs or JFETs cos they are all SMD devices, but am sure they ar

## 89S52 , ULN2803 & 7 segment display- Weird behavior !!

Heyy i am driving 4inch 7 segment common anode display using 89S52 & ULN2803 !! normally my circuit works perfectly ,,but whenever i touch any pin of ULN2803(which is used for driving 7 segment display) with my multimeter's probe, the respective segment switches off !! ??? & this happen with every other segment when i touch respective pin of

## Comparator circuit misbehaviour

The opamp has such a high gain that when the circuit is built on a breadboard then it oscillates. When oscillating, its output is switching high and low at a high frequency. Your multimeter is measuring the average DC output voltage which is near half the supply voltage. Usually, a comparator circuit has hysteresis (a little positive (...)

## Diode ORing voltage measurement

For the below circuit, I have placed multimeter +ve probe at 'B' wrt GND and measures 4V against the expected value of 0V. Hence I have terminated the 'B' end with 10K to GND temporarily before taking the measurement and reads 0V. Why this happens? What happens to the anode of D2 while I connect a multimeter to 'B' end wrt GND ? (...)

## Current on my voltage regulator

Your multimeter will probably have a 10A setting but you might have to change the jack - look at your multimeter.

## 4 probe copper foil resistance measure + AD623 instrument amplifier - output ?

I can't get my circuit to work! What I want to do: Measure the resistance (in fact voltage) of copper foils with the 4 probe method and amplify the output with i.e. an AD623 (tried INA126 too) instrumental amplifier. I attached a circuit of about what I am using. Just to get some figures I checked with a multimeter (which is probably (...)