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Hi everybody, can anybody tell me where to find information on the internal working of a digital multimeter, its constructive aspects and general instrumentation concerning its use? Thanks
Need a service manual/schematic for this old KONTRON digital multimeter DMM3003 Anyone can help?
How does a digital multimeter calculate Voltage , Current , Resistance. Can someone suggest a good reference.
please help me i want to know that how can we check earth and nutral with digital multimeter . please tell me where i can find a tutorial full of pictures if posiible which can tell about using digital mutimeter thanks a lot ..............:D
instr. and maintenance manual fluke 8010A_8012A read it, fluke warn to not operate the instrument with OPTION 01_NICD pack with batteries removed !
Resistors R30 and R31 on pcb 4233-1288d-b are burnt beyond recognition and need to be replaced. They conect directly to the voltage and resistance measurement terminal on my wavetek multimeter. I have searched everywhere for a wavetek dm27xt digital multimeter schematic in order to find out their sizes and types. Anyone who can help?
sir i have digital multimeter for measurement amperage and volts but i have no procedure for measurement ac and dc current i have also attached diagram which i try to measure 12 volt stepdown transformer amperage when we connect red prob one terminal of 12 volt ac and black prob sencond terminal of 12 volt ac my meter show no reading and
Hi guys, I am going to build a digital multimeter with AVR ATmeg32 and it has to be also capable of reading AC voltages to 220 V and AC currents to 1 A. I have the software and hardware needed for the normal digital multimeter, but I dont know what should I do to make it capale of those voltages and currents. I mean is (...)
how to improve stability in 4 1/2 digital multimeter. If the design and components are of low or sub standared ones,(As found in chineese makes) nothing is possible to increase stability. Cheers
Hi. I have a ESCORT99 digital multimeter, but manufacturer company acquiring other electronic company. Therefore, by connecting to a computer required to run the software is not available anywhere.
i use pic 16f877a pleas post digilog jr the details
Hello, I'm searching the schematics of this digital multimeter. Cheers,
I want to build multimeter which can measure V,I,R,C etc.I hope to use PIC,ADC...But i have nt clear idea about how Current is measured ,how maintain autoranges..please give me some ideas,directions to do this project.
Could you be more specific? You could simply hook your ohmmeter up to an RTD or thermistor, but I think maybe that's not the answer you're looking for.
can someone help me with a resistance measuring circuit used in digital multimeter
hello friends. i want to design digital multimeter using 8051. pls help me for doing this project, i need a schematic and program. thanks in advance. :)
Hi everyone, there is a project I am doing and it requires encorporating a module of digital multimeter to measure and display electrical quantities at some points. Normally the digital multimeter has been provided with a battery head so that it can be powered by a battery, but I want to remove the battery head and power the (...)
Consider the below circuit with 28V supply and electronic load set at 5A Constant Current mode. What voltage drop would I expect when I connect a digital multimeter between A & B ? V(AB1)= V(R6)+V(R8)+V(R9) What voltage drop would I expect when I connect a digital multimeter between C & D ? V(CD1)= (...)
I imagine it could quite useful and fun, build your own DMM.. thanks
Hi everybody! I am designing a digital multimeter with a MAX134. My problem is that I don't want to use any mechanical switch or relay when changing the measuring function from voltage to current. any idea? thanks in advance alba800 Added after 7 minutes: SORRY.. I made a mistake writing the questi
MOSFET testing: Regards, IanP So: connect the meter negative to the MOSFET's source. This is arrowed in the drawing above which shows the most popular TO220 MOSFETs. Hold the MOSFET by the case or the tab if you wish, it doesn't matter if you touch
Hi, Here is link to see a multimeter kit description with ICL7106 : from here: I think it would be useful for you to see another solution too:
GAO HOS220C Handheld digital Oscilloscope Supported by stable testing equipments, which are convenient and easy to read during the complicated on-site system, is a visible necessity for all engineers. GAO HOS220C Handheld digital Oscilloscope is designed to match this kind of needs. This handheld oscilloscope has a sampling rate at 100 MS
how can i sure the multimeter is a true rms. what is the method to check an true rms multimeter.
hi friends I want to make this soldering ıron but I don't how to adjust it.language of document about this iron is in Hungary unfortunately I don't know Hungary:D. can anybody help
sir 1.i have measure ac input voltage is 250 volt ac 2.i have measure ac out put voltage is 11.7 volt (by digital multimeter 9205M) 3.when we connect only a single diod to one terminal of ac out put 11.5 volt without using capacitor 1000uf 16v .DMM giving 3. somthing dc volt Added after 1 minutes: [
I would like to know if checking a digital transistor is in the same way as a bipolar transistor since the digital one has one resistor in the base an another one in the base-emitter. rgds marco
I'm measuring the voltage result of my assignment. But , i found a problem, no matter where I connect, my DMM only will appear mV result. Initially I tought that was my circuit mistake, but when i straight connect the DMM with the 12v power supply, my DMM still showed mV results with weird reading !!! How would it be like that ??? Is that mean th
better go for micro controller design, old multi-meters used 7106 but now all are using multimeter and the parts count and the input switches can be reduce, 7106 is good for 3.5digit volt meter but for multimeter you have to add more circuits to it,
Meter check of a transistor : BIPOLAR JUNCTION TRANSISTORS Transistors How to Test a Transistor | Go through this link... hope it will hwlp to you..
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Hello sir i want to know that if i have a capacitor from an old radio or any where & its in working condition but lost the value labelled on that due to atmosphere & i ve a simple digital multimeter in which i dont have option to measure capacitance directly then how could i do so ? just to find capacitance value only here . please te
Hello, Is the inut "LO" terminal of the Keithley 2000 digital meter connected to earth certainly seems to have the earth ground symbol drawn near it. ......the user manual and datasheet dont say......... Keithley 2000 digital meter datasheet: Keithley 2000 digital met
The 17B isn't true RMS. It measures the average AC voltage then assumes it was really a sine wave and corrects the answer. That's fine if the signal was a sine wave (it usually is, otherwise you would be using an oscilloscope). If the original signal was a square wave then the value measured will be incorrect. Keith
where are you? I suspect the more global brands might be more expensive then you like at this stage a digital meter is more 'accurate' but an analog can be more useful if the voltage/current is changing
I've got the operating and service manual for the "HP1742A Oscilloscope" (including Option 001, 090, 101, 102, 580, 900, 901, 902 and 906) and the operating and service manual for the "1700 Series Option 034 digital multimeter" that can be installed on top of the scope. Unfortunately I only have it on paper. What can we do about that because I c
Hi Etrobin, I would build a diode frequency doubler with two diodes + trifilar transformer wound on a small ferrit bead/ or toroidal core, see Fig 2 of the article at (* => t). No need for tuning, it is wideband and you can use 1N4148 or similar high-speed switching diodes (or Scho
Have someone ever designed the DMM with the max134.I am now designing a DMM with the max134,now I want to control the max134 with the avr uprocessor,Can someone providing the information,I am anxiety for it!
You can test the IGBT by multimeter at the Diode test position. Emetor Collektor must be open circuit at the two direction (If you see reverse diod this is not problem). Gate Emetor must be open circuit. If you see any short circuit at the any two pin IGBT is mort. But this is not good test...
By using the positive probe of the diode test on a digital multimeter it is possible to find the base. This will tell you if it is npn or pnp. You can pin it on a breadboard with collector (10k) and base bias resistor (1m) and 2 chances one pin is the collector or the other pin is the collector as it will only conduct one way. Barrybear
It is allways best to use zener diodes to prevent spikes on input to io board Barrybear
A thermocouple consists of two dissimilar metals, joined together at one end, and produce a small unique voltage at a given temperature. This voltage is measured and interpreted by a thermocouple thermometer. The thermoelectric voltage resulting from the temperature difference from one end of the wire to the other is actually the sum of all the vo
I found this two devices, i.e. BCR5PM (TRIAC) & SM8JZ47 (Triode Thyristor), on a washing machine controller board. Is it possible to 'diagnose/troubleshoot' these devices by using only digital multimeter? If it's not possible, pls advise how to determine those devices are still in GOOD CONDITION? Do you think TRIAC = Triode Thyristor? Thank y
The problem is that SMPS draw non-sinusoidal current from the mains unless it has PFC (Power factor Correction). Trying to make measurements without true RMS type meter will give wrong readings
If your meter has hfe measuring function (most digital ones do, some analog ones do too) then you could just try every possible pin combination (BJT's only of course) until you get a reasonable hfe reading (~100 typically).
Best method is Transistor tester. You can get Beta, Vbe, Iss and so on
Usual DVM on diode test position when you measure ordinary Si diode forward voltage drop should show a voltage of about 500 mV. Significantly different readings shows that diode is defective.
ptmsl wrote.... Can charge it from a constant voltage source via a resistor and measure charging time depending on the resistor value.You must choose a resistor that for the given capacitor will give a charging time of a few seconds. Remember the time constant is R*C. Does YES..SOUNDS LOGICALLY CORRECT ... but how to measure/identify that ur [
moreover .why it should be RMS ....why should not as +340V,-340V while referring because, simply said, this value (rms) is sort of a mean value which is engaged in, especially, power calculations, etc. e.g. for resistive loads power can be simply calculated multiplying current and voltage rms values: P