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you can find multiplier design architecture from "Architectures for digital signal processing" Peter Pirsch University of hannver ,Germany John Wiley & Sons it's a good book
Fluke also has very good customer service. I bought what turned out to be a counterfeit meter and they repaired it anyway without complaint.
hi, I would like to build some small multimeter as an exercice purpose, I'm ok for the adc measure and results display, but I'm searching for schematics of input probes: how can you input some 200-1000 volts into max 5v for the adc without burning everything and while keeping the good value and the good shape of the waveform ? I must (...)
if you need a commercial one, hameg 8018 lc meter is a good choice: 400 euros + power module hameg 8001 300 euros. plus kelvin probe if you need precision 100 euros handheld one you have the MT4080 from MOTECH around 1000 euros.. see here
Very interesting web site, however my professor asked us to look for information on digital, not analog multimeters. There is some good stuff I found in this site that could actually help me: the high-impedance voltmeter. Once more, (thank you) obrigado!
dont forget to test the esr of such big capacitor ! the capacity can be good but the capacitor unusable if the esr is to high !
yoh!..its good to have all the datasheets around, and its good to have the multimeter lying around to do the tracing and stuffs. But mind u, these alone are not enuff to reverse engineer. Fundamentals my friend, the key element to success. I mean that is what i think. Oh, experience is rather a bonus i say..
Hi ! good idea is to get the LM317T datasheet: Take the IC out from the circuit and use a breadboard + 2 resistors (or 1 resistor and a potentiometer) and a variable DC power supply, this turn this possible to be tested with the multester. THe LM317T is not like a TO220 package bipolar transistor
The escaped gases from the LEAKED battery have put some short circuit on the COMPONENT's CONTACTS. Try removing the display and WASH the PCB with warm water and soap. Dry it after washing/cleaning with ELECTRIC AIR BLOWER for about 10~12 minutes. Hope will help you get back the proper functions. good Luck :| [color
$10 DMM is a good knock-about meter, good for ad-hoc voltage measurement, and like fixing things around the car... if it breaks, just buy another. more expensive and sub $100 ones are actually very good, you can be quite confident in their accuracy. in any case, if your doing electronics for a bit more than a dabble, you will end up with (...)
Guys please help, DO you know how to check whether mosfet is good or not in circuit? Understand if it always short drain source then we can check it in circuit but sometime there is a case where mosfet switching is not function properly. Usually I will lift up it lead or remove it and check whether its swithing is ok or not. Do you have bet
I am meeting a problem that the MOSFET I bought is bad one that can never work. Maybe they are pulled down by dealer from some old PCB board. So I want to know how to judge if they are good one or fault one with help of some simple tool, eg. multi-meter. Thanks a lot!
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
I wouldn't call them "good", but you can get a basic DMM from Harbor Freight for $3.99 and they have others from there. I have 8 of them for my lab bench where accuracy is not the biggest deal, so I don't have to use the better ones up. My primary beef with these is the current range series resistance, which is pretty high at the low curre
how to know if the crystal dat i use in 8051 is good or damaged?
Another good one here "Mega Meter"
Hi, I am trying to develop what is essentially an Arduino Mega Shield to act as a 'brain' for a project I'm working on. I've had a PCB made (my first), and after thinking I had it sorted have gradually discovered a number of screwups. I'd appreciate some pointers before I attempt revision B.. I have included
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,
Hello, My old micronta 22-193 is faulty. The LCD gives BATT while the batteries are good. The readings on DC are faulty : 0,6 V instead of 1,5 V. The main IC is a SXC 1901F of which I do not have got the datasheet. Does anybody have this datasheet or have the same trouble with this autorange meter ? With my best regards,
Can anyone tell me how to check a photodiode is in good condition for use?Will reversing its polarity destroy a photodiode?
Hello. I have a multimeter (Mastech 390-545) that has a hold button. The button operates mechanically. The hold function does not work. Once the hold button is pressed, the least significant number just slowly counts up (about 27 times per minute), and no connections/disconnections (once hold is pressed) have any effect on the displayed number.
For sure you can inspect motherboard visualy for parts defects, such as capacitors leaking, MosFETs and other power parts exploding or cracking, melting parts, bad pins in power connector sockets,... also you can replace the broken parts with complete new or with good parts removed from some other motherboards. For scope usage and other signal logi
Why do you want to measure the voltage across your current sensor? You can measure the current across it by this multimeter. I think all the multimeters can measure the currents in range from 100mA - 1A now. However the range of current measured by multimeter exist in its datasheet. good luck
Fluke makes really good, really expensive meters. If you can have only one, then you might prefer to look at features beyond the usual. For example I got one on sale at Radio Shack which adds frequency and thermocouple to the usual modes (including the thermocouple adapter in the kit); I've seen others with C and you might, these days, find both
you are testing your crystal?? how?? crystal can be tested using CRO or a good multimeter capable of reading frequency of that range. @ Paro maheswari: you dont need to insert the controller to check the crstal oscillator. check if the crystal oscillator is connected to controller properly, and see if the capacitor i
Fluke 115 also a good model with some advance features compare then Fluke 15B.
Ive got an HP1722B which is quite similar, any good ??? What exactly do you need (ops manual, schematics ??) Schmitt
I have a PC with Tv tuner card. The reception was good when my PC was in one room. I brought my PC to other room & hence i had to use another cable (a new one). After that the reception quality was bad specially for lower frequency channel. I use PAL BG standard. Can anyone help me to get my quality back to normal or tell me how can i find the fa
You should use thermistors (and not varistors as someone suggested. Those are for overvoltage protection). There are 2 kinds NTC (negative temperature coefficient) which means that as the temperature goes up the resistance goes down, and PTC (positive temperature coefficient) where the resistance goes up with temperature. They are cheap, they come
Flatulent: how is the common mode effect taken care of in handheld multimeters with current measurement capability? My Fluke multimeter runs off of a 9V battery and yet I can measure current in series coming from sources much greater than that. Anyway can a charge-pump be used for bias the instrumetation amp or does it introduce too much ripple
If it is of any help, I fixed mine (Toyota Celica Supra) and a few for a friend that had a car dealership. They were all simple faults like, faulty regulator, diode and some open circuit low value resistors. I just used my eyes, nose and a multimeter. good luck, E
for a simple (DC) estimation of the SNR, a good 6-digit multimeter can be enough. However, you will have to take care of the design of your test board (connector, decoupling , etc....) especially for sigma-delta ADC where digital output noise can easily affect analog input.
The best way is to measure voltage (connected through musltiplexer ) on resistor connected to current source (also connected through multiplexer) As internal voltmeter resistance is much high than any miltiplexer connection , accuracy will be quite good . Let say 10MOhm/100 Ohm =10e5. It is much more than resolution of your multimeter (if it is
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...
probably you already know siemens application note regaring IL300 linear opto-isolator, I implemented same circuit (same amplifiers, TIL300 optocoupler , IL300 from another manufacturer, same FET) but my circuit is not linear as described in the app. note. I suppose the only difference is they fed opamps with +/-9V DC, but I applied 12V DC.
just get a good book on electrical measurements and instrumentations i have studied voltmeters and ammeters from "Electrical and Electronic Measurements and Instrumentation" by J. B. Gupta. but i think that this book is not available outside India and Pakistan. so just get any book on this topic. and if u are able to find this book it will be be
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
You can buy a multimeter and manually enter the data. But if you really want good data you should get an Oscope, GPIB card, and Labview (or MatLab). This way you can run a program that will get as much data as you want. But it's alot of investment. Cheers
ur PIc might be damaged ..... do not trust that ur new PIC (i mean if u just bought it from supplier ) is always good i used to buy a new PIC 16F877A from suplier but PORTE wasnt work well .. i was lucky b'caz i bought 2 PICs ....
This is not so simple..your multimeter input impedance is somewhere in MΩ range so the input will very comfortably "eat" this current .. You will need a good quality instrumentation amplifier to buffer and amplify this signal and then, and only then, you will be able to measure nanoamps.. Regards, IanP
Basically yes - but the LCD has a much slower response than an LED so the multiplexing frequency cannot be very high. On the other hand a static drive is not good either because it will cause "burn-in" of the segments. Check this link for some useful information:
I am having too much problems with noise in the in-built ADC of atmega32 Instead of external voltage I used internal 2.56 Vref and applied the voltage, then I am getting 2.55V for 2.24V. I used a capacitor of 150pf,22pf b/w AREF and ground. I removed the multimeter probes from the breadboard, then a small difference came. But the noise is too
Hi, You can detect if a given transistor is a NPN or a PNP with the help of a digital multimeter in Diode mode. A NPN transistor will have a diode between its base and its emitter with its anode at the base and a PNP transistor will have the same diode but with its cathode at the base. However the calculation and the use of these transistor c
Not sure which compiler you are using, but I know the 628 also has an internal osc, and the following may or may not, be relevant: ER_IO External resistor osc INTRC_IO Internal RC Osc, no CLKOUT ER External resistor osc, with CLKOUT INTRC Internal RC Osc Also the two previous posters offer some good advice. If your delay is only 500 micro
Have a look there : I guess that measurement tool yo use for output power does not filter incoming voltage so ripple and overshoots (its amplitude is much more ) affecting your measurement. The first doc says me
This will be a good place to start and it is free. Silicon Sam's Technology Resource This is a collection of Sam Goldwasser's fault-finding & repair tips for many things. From this collection, a few pointers: (Some very wise words) Comments on How to Learn Repair By all means, do what you c
Anyone could tell me what's component is bearing number OM2045 B723? How to test is it in good condition or bad? Can it test by using Multi Meter? Hope someone could help. Thanks & best regards, Keng Loong
Dear all, I want to measure my current dac. I have some question. 1.How do I measure my INL and DNL using multimeter? Because my current dac has 12 bits and 500MHz. Too many points. How do I measure INL and DNL by using multimeter? Or if you have some good method , please tell me detail. Thanks. 2.If I want to measure (...)
BTW there are a lot of similar projects - just try to search this forum for CID - caller id. good luck.
You forgot: - A good quality digital meter (ammeter, voltmeter, ohmmeter, etc). Fluke ? - Maybe a frequency counter / meter