Overvolted multimeter?

Hi.  Simple question. (or maybe not) I have a digital multimeter I bought a while ago that I think I accidentally put too much voltage through. The voltmeter function on it is now broken. Whenever it's turned on, it reads "156 VDC" even though no voltage is being applied. (however, when I do apply voltage, the meter does detect it.) All other functions seem to be working correctly, but I'm bummed because the voltmeter is what I use the most. Is there any way to "reset" a multimeter? if not, is there anything I could try to fix it? Thanks in advance.

Question by tylervitale 6 years ago  |  last reply 6 years ago


Multimeter Capacitance Meter? Answered

Can a multimeter with a capacitance meter measure capacitance of a home made high voltage capacitor?

Question by The MadScientist 8 years ago  |  last reply 8 years ago


Add a buzzer to a multimeter? Answered

Hello, is it possible to add a continuity check buzzer to this MAS830S mutimeter ? i would like to do like on this video but i cant find which resistor is the good one http://www.youtube.com/watch?v=ItqYUUjcwfk i don't care if the buzzer is inside or not thanks

Question by rastactivist 5 years ago  |  last reply 7 months ago


Multimeter inductance meter? Answered

I am building a Tesla coil with a fairly poor primary coil. The primary coil is a conical 12.5mH (theoretically) but when I measured it with my multimeter the inductance kept jumping and was only doing so within the range of .05mH - 2mH why is this can it not measure conical coils?

Question by The MadScientist 8 years ago  |  last reply 8 years ago


Need a cheap Multimeter?

Anyone in need of a cheap multimeter should click this link, print it out and get thee to harbor freight, where they honor the online price. It's their $40 multimeter on sale for $20, Has 30 function inc. freq. to 20kHz and temp to 1000 celsius. I've several of their $3 ones so i couldn't resist this one at this price.

Topic by Tool Using Animal 11 years ago  |  last reply 11 years ago


Make Presents: The Multimeter

Take a look at Make's latest video about multimeters. I'm really into make's series on electronics how tos. What subjects would people want instructables to do a how to series?

Topic by frenzy 8 years ago  |  last reply 8 years ago


are these sufficient specs for a multimeter?

These are the specs off a multimeter im about to buy. are these enough to do electronic projects off instructables.com, fixing electronics, and etc? if not then what do i need then? thanks DC Voltage: 200mV-1000V AC Voltage: 2V-700V Temperature: 20°-1000°C Resistance: 200Ω-20MΩ DC Current: 2mA-20A AC Current: 20mA-200mA Capacitance: 2nF-20µF Frequency: 10Hz-20kHz  

Topic by leader1 9 years ago  |  last reply 9 years ago


Testing a Cheap Multimeter

It's been years since I had an expensive meter. These days, I have meters in the $5 to $20 range. Usually they're accurate enough for my purposes, but what if I want to be really certain? Is there a way without a pricey meter to test em?  Perhaps calibrate the meter by checking v  coming out of a v regultor. Would that be accurate? Perhaps the 7805 regulator which is supposed to output 5v.  y?n? M?

Topic by Toga_Dan 4 years ago  |  last reply 4 years ago


Multimeter DIY Repair?

I have a Radio Shack digital multimeter, Model 22-174. Since the 10 Amp measurement circuit is not fused I blew this circuit and that part of the meter does not work now. I like this meter and would like to know if I can DIY repair it and what I need to do. I have looked around the Internet and have not found any information including the Radio Shack site. Was looking for the wiring diagram only found a parts list. I hope that I can fix it. If I can fix it I will fuse the test leads (black lead) or work out an internal fuse for this circuit so I don't repeat my mistake. Any help would be nice. Thank you.

Question by phantom9 9 years ago  |  last reply 3 years ago


Arduino Multimeter on 1602LCD? Answered

Hi I am currently in the process of finishing the code for my Arduino controlled PSU with an LCD volt and amp meter. My question was basically, how can I get the volts and the amps to show on the LCD with 3 decimal place digits instead of 2 which i have now. Also, im having trouble putting 4 measurements all on one display- i currently have watts, amps and volts but i wanted to add resistance, however, for some reason i cant fit them all in one screen and i get weird errors when i try changing the setCursor value.  Thanks P.s here is the code I'm using (a took bits off different websites and examples-will reference them in the final sketch) #include const int numRows = 2; const int numCols = 16; LiquidCrystal lcd(12, 11, 5, 4, 3, 2); int analogInputVolts = A0; //voltinput int analogInputAmps = A1; //ampinput float vout = 0.00; float vin = 0.00; float amps = 0.00; float watts = 0.00; float ohms = 0.00; float VA = 4.970;          // Arduino 5V supply float R1 = 2995;        //  R1 in ohms float R2 = 999;        //  R2 in ohms int readAmpsADC = 0; int readVoltsADC = 0; void setup(){   Serial.begin(9600);   lcd.begin(16, 2);    pinMode(analogInputVolts, INPUT);    pinMode(analogInputAmps, INPUT);    delay(500);                    } float fmap(float x, float in_min, float in_max, float out_min, float out_max) {   return (x - in_min) * (out_max - out_min) / (in_max - in_min) + out_min; } void loop() {    readVoltsADC = analogRead(analogInputVolts);    readVoltsADC = readVoltsADC + analogRead(analogInputVolts);    readVoltsADC = readVoltsADC / 2;    vout = (readVoltsADC * VA) / 1023.0;    vin = vout / (R2/(R1+R2));     delay(100);         readAmpsADC = analogRead(analogInputAmps);    readAmpsADC = readAmpsADC + analogRead(analogInputAmps);    readAmpsADC = readAmpsADC + analogRead(analogInputAmps);    readAmpsADC = readAmpsADC / 3 ;      // get average of 3 readings    amps = fabs(fmap(readAmpsADC, 509.0, 699.0, 0.0, 5.0));    if (amps < 0.09) amps = 0.00;    if (amps > 5) digitalWrite(13, HIGH);    delay(100);    if (vin < 0.5) vin = 0.00;          watts = vin* amps;    ohms = vin / amps;    Serial.print("Resistance-Ohms:");    Serial.println(ohms);    if (amps = 0.00) Serial.println("Nil");          lcd.print(" ");    lcd.print("V:");    lcd.print(vin);    lcd.setCursor(1, 1);     lcd.print("A:");    lcd.print(amps);   lcd.setCursor(0, 0);      lcd.print(" ");    lcd.print("W:");    lcd.print(watts);    lcd.setCursor(7,0);       delay(400); }

Question by lightemmitingdiode 5 years ago  |  last reply 3 years ago


What is this function on my multimeter? Answered

Model of the multimeter is DT9205A. the picture is given below.

Question by Ahtasham Ahmad Mohtashim 5 years ago  |  last reply 5 years ago


E-sun UT30C Multimeter?

I have a couple of multimeters that display a '1' on the screen at all times and don't measure anything anymore. Does anyone out there know how to fix this? Thanks

Question by Physatwes 6 years ago  |  last reply 6 years ago


Cheap Auto Range Multimeter? Answered

As the question states. Anyone know of a good, cheap, auto range DMM? The more features and higher ranges the better. I don't need true RMS, would like capacitance checking ability as I reuse a lot of used electronic components from stuff people throw away, and I always saw auto range as more of a convenience, not a necessity. I would like to spend as little as possible, as I'm sure I'll eventually burn it out on one of those used components, like I did the $20 harbor freight clamp meter I had.

Question by Dochide 7 years ago  |  last reply 7 years ago


full deflection of analogue multimeter needle? Answered

Hi, I accidently kept the dial at 25ma, instead of 250v ac of my analogue multimeter, the needle jumped twice, i realised my mistake and immediately disconnected, the problem now is when ever i check any reading including ohms check, the needle deflects fully, any idea what  i must have damaged. Hi, I just added the front and back of the PCB, if u gentlemen could identify, the shunt resistor and the current limiting resistor, will be of great hep

Question by patrickvaz 8 years ago  |  last reply 8 years ago


what is the price of digital multimeter in india (curreny-rupees)it should be range of 200mV-1000V.

What is the price of digital multimeter in india (curreny-rupees)it should be range of 200mV-1000V or can any suggest which is the best multimeter....(model numbr & company)

Question by rachit59 9 years ago  |  last reply 6 years ago


my 35 year old analog multimeter suddenly packed up?

There is no continuity on several cylindrical parts with coloured stripes on them, transistors??. 1 Diode "D1"  does not test either. Is it possible to identify the parts I marked with red dots in the foto attached so that I can order them from somewhere in the UK. I do not know where from either. Thank you There is no continuity on a few small cylindrical parts no

Question by ulindel 1 year ago  |  last reply 1 year ago


a couple of questions

I have a greenlee multimeter and i cant get it to give a read out it just stays at 0 it was working fine then all of the sudden it will not do anything any ideas as could be wrong? resistors? does it matter which way they are connected and when i hook one to a power lead and stick a multimeter on the other side the voltage should be different right?

Topic by LoveforBlueFarms 10 years ago  |  last reply 10 years ago


have a archer kit 28-2014a cannot get resistance to work.

All resistors in r circuit are good but am not sure how selector switch works a good assembly instructions would help

Question by frankkey 2 years ago  |  last reply 2 years ago


What multimeter should I get?

After making my first few electronics projects I've learned that I really should get I multimeter so I don't screw everything up. So I've been looking around a bit and there's a lot of choices out there and I don't really know what features I should be looking for except I do know I want to get one that can read loads up to 4 to 5 amps (or maybe even more). I only want to spend around $30-$60. I found this one on amazon http://www.amazon.com/exec/obidos/tg/detail/-/B000JQ4O2U/ref=ord_cart_shr?_encoding=UTF8&m;=AMH4W1K8OCGMX&v;=glance does this look like a good one?

Topic by cannedham160 10 years ago  |  last reply 10 years ago


Go buy a digital Multimeter next week...

Harbor Freight is having a sale. This is a quite useful meter; it probably won't set any accuracy records, but at $4.99, everyone experimenting with electronics ought to have one. At $2.09, everyone who thinks they MIGHT do electronics should get one, and actual experimenters should get two (so as to be able to measure current and voltage at the same time.)

Topic by westfw 10 years ago  |  last reply 10 years ago


Testing Tesla coil frequency with a multimeter frequency (Hz) meter?

My multimeter can measure up to 20MHz and I was wondering if I could test the resonant frequency of my Tesla coil by running it (untuned) then having the multimeter attached to an inductor a few feet away?  Would this work or would I need some kind of small circuit attached to the multimeter as well? If I could do this would it work with the primary as well?

Question by The MadScientist 8 years ago  |  last reply 7 years ago


How do I tell if my multimeter is dead?

I was trying to measure current, then voltage and - basically I had no idea what I was doing and soon everything returned zero. Opened it up, dont see the wire in the fuse anymore. It was rated 250ma 250v 5Ø 20mm. The shop I went to did not have it so I settled for a generic looking fuse rated at 250ma. The multimeter still shows 0 for all the batteries I've tried. Is it time to get a new meter or find a proper fuse?

Question by pantss 7 years ago  |  last reply 7 years ago


Wanted: Analog or Digital Multimeter

If anybody has a old or broken analog/digital multimeter and would be willing to ship it to New York United States it would be really useful. 

Topic by Kante Tech 8 years ago  |  last reply 8 years ago


there a way to calibrate an autoranging multimeter?

Hello community, I have a little problem with auto ranging multimeter Techman brand TM-107 the question is that I would like to calibrate and mark certain ranges wrong, I have intermediate level knowledge of electronics, the question is whether by changing parts that do not make their specific value would fix the problem or would have to make other method?

Question by jediknightgeorge 5 years ago  |  last reply 5 years ago


What is measured in this mode? Answered

I found a sign on my multimeter but i don't know for what it's used for can anyone tell me please? The image is shown below!

Question by ubdussamad 5 years ago  |  last reply 5 years ago


Autorange Brymen BM511?

I have an unusual problem. My BM511 will not auto-range and readings on VDC are odd. A 1.5v battery initially shows OL, then 00.61, 001.5 then 0002V as you manually step up through the range of the meter using the 'range' button. I suspect it has been burnt, either the input protection, bridge or scale divider. As I do not have a diagram i cannot fault find. Does anyone have a circuit diagram for the Brymen BM511 DMM. Thanks in advance. Regards, KH

Question by KeithH65 2 years ago  |  last reply 2 years ago


Radio Shack Digital Multimeter beeping?

I bought this meter last week and when turned on it does not cease beeping. I know this is not normal. Is it bad or can the beeping be stopped. I looked in the instructions a and could not find anything on this. Thanks, MV

Question by Manolo71 4 years ago  |  last reply 2 years ago


Two loss wires to solder on stereo wireless hp's, both red, which one goes where using multimeter?

Hi, I have two disconnected red wires on the left side cups that need reconnecting to the, -L  & 3V on the board which you can see on the image below. My question as a multi-meter novice, how do a test to know which red wire goes to which point? Also is there any danger of overheating the board on so small solder points? Any help much appreciated

Topic by Optical10 6 years ago  |  last reply 6 years ago


Two loss wires to solder on stereo wireless hp's, both red, which one goes where using multimeter?

Hi, I have two disconnected red wires on the left side cups that need reconnecting to the L- & 3V on the board which you can see on the image below. https://www.dropbox.com/s/pisf15rkthlnlyk/DSC02001.JPG https://www.dropbox.com/s/9e97veutva4gpaj/DSC02000.JPG https://skydrive.live.com/redir?resi...M_vkdGusRCa8oc https://skydrive.live.com/redir?resi...M_vkdGusRCa8oc My question as a multi-meter novice, how do a test to know which red wire goes to which point? Also is there any danger of overheating the board on so small solder points? Any help much appreciated

Topic by Optical10 6 years ago


Adding an indicator led to a multimeter when it is on? Answered

I would like to add an indicator led because I keep leaving it on and draining the power.

Question by hkerr 4 years ago  |  last reply 4 years ago


what do these features do on a multimeter??

I went to this website to help me find a multimeter and these features were in the filter that i either dont know what they are/do or know if they are important. so can anyone tell me what these features do on a multimeter, what they are used for, and if they are important. 1. frequency 2. period 3. ratio 4. temperature 5. Vp-p 6. diode 7. continuity 8. 2/4 wire resistance 9. conductance 10. dBm 11. duty cycle 12. inductance. 13. pulse 14. TRMS 15. capacitance note: they have said that capacitance doesnt need to be a feature do to problems and i want to use a multimeter to simple to complex electronic projects like on instructables.com and robotics when i get to that level. thanks

Topic by leader1 9 years ago  |  last reply 9 years ago


Radio Shack digital multimeter issue

Model is 46 range pc interface. Got it last week, second one after the original went bust, so rs interchanged it. But this one once turned on, does not cease to beep continuously. I know this is not supposed to happen. So, how do i stop this beeping? Thanks

Topic by Manolo71 4 years ago  |  last reply 3 years ago


MultiMeter Reading Wacked? My brain wacked?

Ok so I just bought a new meter and I decided to test it out on my new circuit, but I was much surprised! The circuit is identical to this one: https://www.instructables.com/file/FSKP1NOHS18BW4T/?size=MEDIUM except for instead of 4 leds on rows 1 & 2 it has 8 leds per row.  Since I didn't want to type it all up heres the video. So all help is appreciated! Thanks!

Topic by HavocRC 4 years ago  |  last reply 4 years ago


Need help with an LED project Answered

I've almost collected all of the necessary parts to start experimenting. Just enough for simple experimentation. Though I'm curious what type of wire I'll need to find to connect everything. I'm using a breadboard. Also, I have a multimeter, is there a way I can test the voltage of the LEDs to make sure I pick the right transistor?

Question by Crucialitis 9 years ago  |  last reply 9 years ago


What voltage does the RCX give on its motor ports?

I am thinking of making a motor (among other things) for the RCX, seeing as it only comes with 2, but I don't know what voltage motor I need. Also, I dont like how the motor doesn't have a flat bottom. (Only one of the mistakes of the Lego company)

Question by chaoszerom 9 years ago


What's the difference between a Fluke 87III, 87IV and 87V?

The series designations are confusing me. A couple of the sites I've visited have mentioned the series V can withstand 8000V switching transients. But then, you never know when something is just marketing hype and all of the series can withstand 8000V switching transients. I ask because I'm currently studying transient phenomena (LV), and will be working my way up to HV in the future.

Question by Vorenus 7 years ago  |  last reply 7 years ago


How to work with digital multimeter displays? Answered

Ive got some old digital multimeters which no longer work. I see their displays lying around and get this urge to make them work and see them showing something (temperature probably?)...... So, well... as you would have found out, I dont know how to do this. I can use microprocessors but how to and where to work them????? God, i need help with relaxing my brain... ;) lol

Question by pro2xy 8 years ago  |  last reply 8 years ago


Does anyone know how I can learn electronics principles without enrolling in a degree program? Answered

I always seem to have a need to fix or troubleshoot an electronic device and I want to learn the basic principles of electricity and stuff so I can: 1) avoid shocking the life out of me. 2) replace simple components without blowing stuff up or burning out components. 3) make the decision to do my own repair or to send an item out for repair. (Making more intelligent decisions regarding electronics without being snowed over by some repairman).

Question by geowulf 9 years ago  |  last reply 9 years ago


AC or DC? Answered

Is there a way to tell if something i AC or DC power if you dont know, my multimeter will read ac on the dc setting and vice versa.

Question by Jimmy Proton 8 years ago  |  last reply 8 years ago


Amp hour draw question for LED setups

Hi, I have an led setup that is drawing .39A  @12v.  I am running it with a 4.5ah alarm panel battery. My questions are: Is there a way to calculate the how long this set up will run  knowing that leds stop working when the power dips under a certain amount?  I have been running this set up for about 4 hours at a time, about once a week without issues for several years.  I always top off the battery at a 2amp setting on the charger.  It always takes less than an hour to top off after 4 hours of use.  This is probably good for the battery cause it shows that it isn't being drawn down much during it's 4 hours of use.  I then put it on a float charger for storage till the following week.   Could this be run on a smaller battery without affecting the battery life?    I would like to run the smallest and lightest set up possible while maintaining the health of the sealed battery that probably doesn't like heavy recharge cycles. What is the smallest I should go while keeping the battery healthy?  Thanks for the info. 

Topic by thewetturd 7 years ago  |  last reply 7 years ago


How do you test ground continuity with a multimeter?

Question by adamgillies 8 years ago  |  last reply 8 years ago


Resettable Fuse PPTC Polyswitch instead of normal fuse?

Hello Friends, I have basic multimeter which has 250ma 250v fuse in it.  some how due to bad test it fused due to higher amps. now I am planning to replace it with 250ma 250v Resettable Fuse or PPTC or Polyswitch. can I go for it or it may create problem? any body have tried?

Question by supertechey 3 years ago  |  last reply 3 years ago


How to create led lights and sound turn on one after the other when a button is pressed?

I am crating a project that consists of an array of led lights that turn on one at a time in order from first to last with a delay in between each led.  In this project I also have to include a recorded sound to each led that will play once the led is on. Once I release the button the only the lights that got to turn on stay on .  Any help will be gladly appreciated!!!

Question by Cervantes66 2 years ago  |  last reply 2 years ago


How to calculate battery current with digital multimeter?

Null

Question by Rendydevara 9 years ago  |  last reply 9 years ago


How to build a joule thief? Answered

      I'm building a voltaic cell and a joule thief. I searched on some instructables and followed the one on youtube by MAKE:. When I hook up a 9V for a few seconds (To not burn the LED out), it works. However, a AA doesn't work. Not even a brand new one. So, I presume that I haven't wrapped the toroid around enough to create more voltage and lessen the amperage (If that's what joule thieves do)? I posted some pictures below. Also, I'm looking to buy a voltmeter, I'm around basic level and just need to measure if the joule thief is even increasing voltage (For now at least). Here are some cheap ones I'm looking at on amazon:  http://goo.gl/gVvo6P http://goo.gl/hKKtGu http://goo.gl/Q2rrKm http://goo.gl/MQZeeS http://goo.gl/if04Es Some of those have autoranging, is this to automatically find the voltage/amperage? Thanks, please reply

Question by knexpert1700 5 years ago  |  last reply 5 years ago


Powering a multimeter built into bench-top power supply?

Recently I built a bench-top power supply from an ATX power supply (Like the one from here: https://www.instructables.com/id/Convert-an-ATX-Power-Supply-Into-a-Regular-DC-Powe). It works great but I'm looking to consolidate this and my analog multimeter into one box. I'd like to know how to power the multimeter using the power supply so I don't have to worry about changing the batteries. The multimeter uses two AA batteries and a 9V, and the power supply has voltages of 12, 5, 3.3, 0, -5, and -12. Thanks for any help.

Question by ranab998 8 years ago  |  last reply 8 years ago


Why does my multimeter read 18vdc on a 12vdc walwart? Answered

Question by BluTiger 8 years ago  |  last reply 8 years ago


Thermocouples?

I have a multimeter which has a thermocouple I can plug in to get a temperature reading. I really like the thing, but the thermocouple itself isn't all that robust. Although the meter is capable of reading temperatures up to 1850F, I doubt the thermocouple would last long at only 400-500F. My question is, is it possible to buy another thermocouple and use it in place of the provided one and still get fairly accurate temperature readings? I was thinking of maybe using a thermocouple normally used in furnaces or hot water heaters.

Question by tylervitale 7 years ago  |  last reply 7 years ago


How to measure capacitance?

What is the most inexpensive way that I can measure capacitance? I have some photoflash capacitors that aren't marked with their capacitance. I went to radio shack, and the cheapest multimeter that measured it was around 60 dollars. Is there a cheap way that I can find out the rating of my capacitors?

Question by daa5849 9 years ago  |  last reply 6 years ago


What specifications should I look for when choosing a multimeter to buy? Answered

I am looking to buy a multimeter for general use and would like some advice and/ or recommendations of what I should buy. I would preferably like a digital multimeter with a price of under $50.

Question by UbuntuNinja 9 years ago  |  last reply 9 years ago