Latest Projects Education. JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding. Thread starter xchcui Start date Oct 13, Search Forums New Posts. Thread Starter xchcui Joined May 12, I have the M digital multimeter. All the function are working good ammeter,voltmeter.

When i attached the probes together,the display shows "",and when i separate them,instead of showing infinity,the display is shown increasing value of resistance again,the probes do not touch anything.

It doesn't response when i try to measure a resistor and if it does the value are far wrong.

dt830d digital multimeter circuit diagram

It happens after i did a capacitor test,while connecting the dmm probes ohm meter function to the capacitor to charge it a bit.

Maybe the capacitor damage something in the dmm,but when i opened the DMM,i didn't notice any burned or damage component. The battery is good,btw. What can be the component that caused this failure? Thanks in advance. Scroll to continue with content. Check the internal fuse. You can get proper meters for testing capacitors - but even with those a charged capacitor can damage the meter. A DMM doesn't seem to me like it gives any sensible reading on a capacitor, with an analogue meter the needle gives a kick as the test voltage charges the capacitor.

An analogue meter is a little more tolerant of unintentionally being used to discharge a charged capacitor, but you can still bend the needle if it hits the end stop hard enough!

The internal fuse in that DMM is not related to the resistance function,but to the ammeter function low DC currents. This DMM can not read capacitor value,but it can give you some idea on the condition of the capacitor.

But,my question are:What can be the component that caused this failure? Can you take really good clean crisp pictures of the internal components of this meter both front and back? The more the better and post them back here. I attached some photo of the internal componenets. I tried several times to take a good clean crisp picture,but the best that i got are the ones that i attached. And they,unfortunately,still bad refer to the fact that it makes it difficult to follow the circuit and the components condition.

But this is the maximum that i could achieved. Maybe the photos will be useful somehow,even though,they are not clear enough. Nevertheless,i assumed that my description about the failure will be enough,in order to get an answer.

Only the ohm meter function is failed,so only small part of the DMM should be suspected the component that related to the ohm meter. And i assumed that the scenario that i described before,will be enough to an experienced professional electrician to know what caused this scenario. Dodgydave Joined Jun 22, 8, Dodgydave said:. ISB Joined May 21, 1,Page of 13 Go. Quick Links. Table of Contents. DT Series. Page 2: Warranty If the defect has been caused by a misuse or abnormal operation conditions, the repair will be billed at a nominal cost.

In the latter case, the transient stresses are variable; for that reason, its necessary that the transient-withstand -capability of equipment is made known to the user. Page 4: Maintenance CAUTION To avoid possible damage to the meter or to the equipment under test, follow these guidelines: Disconnect circuit power and discharge all high-voltage capacitors before testing resistance, continuity, diodes, or capacitance. Use the proper terminals, function, and range for your measurements.

Before measuring current, check the meter's fuses and turn power off to the circuit before connecting the meter to the circuit. Page 5: Front Panel Description This function allows the meter to output a signal as a signal generator. Page 6 To use safely, each measurement can not last for more than 10 seconds, and the interval between each measurement must be more than 15 minutes.

Page 8 3.

dt830d digital multimeter circuit diagram

Set the range switch to the desired range. If the resistor to be measured is connected to a circuit, disconnect circuit power and discharge all capacitors before measuring resistance. Page 11 1. Set the range switch to " " or " " range.

A test signal will appear between the and "COM" jacks. The voltage is approximate 5Vp-p. A coupling capacitor should be used when connecting the meter to a circuit. Page Battery And Fuse Replacement Before attempting to open the case, always be sure that test leads have been disconnected from measurement circuits.

Close case and tighten screws completely before using the meter to avoid electrical shock hazard. This manual is also suitable for: a b d e Show all h bl.

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DT830B Digital Multimeter

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Electro Tech is an online community with overmembers who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now. JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding. DTx Multimeter Circuit Diagram. Thread starter Electroenthusiast Start date Feb 24, Electroenthusiast Member.

haoyue dt830d multimeter circuit diagram

It's a simple multimeter capable of accomplishing varied measurements. In all likelihood it contains a custom chip that performs most of the functions and it's very unlikely you'll find a circuit diagram.See more product details.

Small multimeter for your day to day needs. If you have basic knowledge about multimeters you can try this small multimeter for basic continuity checks and voltage measurements.

Resistor ohms. Transistor HFE. Square wave output. Battery test. Display: 4. Would you like to tell us about a lower price? To avoid possible damage to the meter or to the equipment under test, follow these guidelines: Disconnect circuit power and discharge all high-voltage capacitors before testing resistance, continuity, diodes, or capacitance.

Use the proper terminals, function, and range for your measurements. Before measuring current, check the meter's fuses and turn power off to the circuit before connecting the meter to the circuit.

Before rotating the range switch to change functions, disconnect test leads from the circuit under test. Before attempting to insert transistors for testing, always be sure that the test leads have been disconnected from any measurement circuits. Remove test leads from the meter before opening the Meter case. Skip to main content. Currently unavailable.

We don't know when or if this item will be back in stock. Have one to sell? Sell on Amazon.Latest Projects Education. JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding. Thread starter wdevasurendratp Start date Dec 11, Search Forums New Posts.

digital multimeter

Thread Starter wdevasurendratp Joined Dec 11, 3. Scroll to continue with content. Dodgydave Joined Jun 22, 8, Does this site help in any way??

Dodgydave said:. I have one of these at work. If you can wait until tomorrow I can open it up and have a look inside. I will get back to you. Superklin Joined Jul 9, 5. Hi, I have the same problem, someone know the value of R5? MrChips Joined Oct 2, 20, Yasu Joined Mar 11, 1. What is the value of R6 resistor you had changed pls resond.

dt830d digital multimeter circuit diagram

DarthVolta Joined Jan 27, The chip in all these is something like ICL, so most of the circuits are pretty similar, depending on what the cheap chipmakers cooked up that week.

Then I got another and fried it when I was careless. I only wanted that 1 as a basic ampmeter, so I might get another 1 yet. You must log in or register to reply here.

HOW TO REPAIR DIGITAL MULTIMETER !!

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Thread starter carolb4 Start date Feb 20, Search Forums New Posts. Thread Starter carolb4 Joined Feb 20, 1. I have a Commercial Electric handheld digital multimeter. I'm trying to test parts of an icemaker and was told from this website to: Conduct this test with the refrigerator unplugged. Test the mold heater for resistance using a multitester. Set the multitester to the ohms setting X1.

Place one probe into the hole labeled "H" and the other probe into the hole labeled "L". The multitester should read in the range of 60 to 90 ohms. This multimeter does not have X1 on the meter scale. There is2K, 20K, K, etc. I don't know how to test. Please advise. Scroll to continue with content.

The scale reads to ohms. If is the lowest scale then that is the one to use. X1 refers to the "times 1" scale. I have replaced two icemakers over the years. It is my humble opinion that you will be better served to replace the icemaker with a new one. You will benefit in the long run. The nomenclature "X1" is obsolete and comes from the days when multimeters were analog devices. The basic idea was that you multiplied the resistance reading on the analog meter scale by the factor after the X.

Modern digital meters require no such conversions on the part of the user other than, perhaps, knowing about SI prefixes. VoodooMojo Joined Nov 28, SI index reference. SI Prefix. Don't you hate jokes you gotta explain. Wendy Joined Mar 24, 21, Attoboy is faint praise indeed.

VoodooMojo said:.