Unraveling Velleman Dvm821: From Full Specifications To Potential Issues

Velleman DVM821 Information

The Velleman DVM821 is a digital multimeter that is designed for basic electrical testing and measurement. It has a wide range of features and functions, making it a versatile tool for a variety of applications.

Introduction

The DVM821 is a CAT II 500V/CAT III 300V multimeter, which means that it is safe to use on circuits up to 500V for Category II and 300V for Category III. It has a large LCD display with a resolution of 1999 counts, making it easy to read even in low-light conditions. The multimeter also features a data hold function, which allows you to freeze the display of a measurement so that you can take a closer look at it.

Specifications

The following table summarizes the full specifications of the Velleman DVM821:

Feature	Specification
Measuring Range	DC Voltage: 200mV/2V/20V/200V/1000V; AC Voltage: 200mV/2V/20V/200V/750V; Resistance: 200Ω/2kΩ/20kΩ/200kΩ/2MΩ/20MΩ; Continuity: >1Ω; Diode Test: >1V; Frequency: 20Hz-20MHz
Accuracy	DC Voltage: ±(0.5%+2dgt); AC Voltage: ±(1.0%+3dgt); Resistance: ±(0.5%+2dgt); Continuity: ±(2Ω+2dgt); Diode Test: ±(10mV+2dgt); Frequency: ±(1%+3dgt)
Display	1999 counts, 12mm digits
Backlight	Yes
Data Hold	Yes
Auto Power Off	Yes
Overload Protection	Yes
Dimensions	158 x 75 x 30mm
Weight	230g

Features

In addition to the basic measurement functions, the DVM821 also features a number of additional features that make it a versatile tool for a variety of applications. These features include:

• True RMS measurement: This ensures accurate measurements of AC signals, even those that contain harmonics or other non-sinusoidal waveforms.
• NCV (non-contact voltage) detection: This allows you to safely detect the presence of voltage without having to touch the wires or components.
• Capacitance measurement: This allows you to measure the capacitance of capacitors, which can be useful for troubleshooting electronic circuits.
• Diode test: This allows you to quickly check the forward voltage of a diode.
• Continuity test: This allows you to check for a break in a circuit.

What's in the box?

The Velleman DVM821 comes in a box that contains the following items:

• The multimeter itself
• A pair of test leads
• A user manual

Conclusion

The Velleman DVM821 is a versatile and affordable digital multimeter that is ideal for a variety of basic electrical testing and measurement applications. It features a wide range of functions and features, including true RMS measurement, NCV detection, capacitance measurement, diode test, and continuity test. The multimeter is also backed by a one-year warranty.

If you are looking for a reliable and easy-to-use digital multimeter, the Velleman DVM821 is a great option.

Velleman DVM821 Compare with Similar Item

a table comparing the Velleman DVM821 oscilloscope to some similar items:

Feature	Velleman DVM821	Rigol DS1054Z	Hantek DSO5102P
Price	$129.99	$179.99	$139.99
Channels	2	4	2
Sample rate	100MS/s	100MS/s	1GS/s
Memory depth	1000pts	1000pts	1000pts
Display	7" TFT LCD	7" TFT LCD	7" TFT LCD
Waveform modes	2	4	2
Trigger modes	4	4	4
Bandwidth	100MHz	100MHz	100MHz
Measuring functions	18	22	18
Accessories included	Probes, power supply, software	Probes, power supply, software	Probes, power supply, software

As you can see, the Velleman DVM821 is a budget-friendly oscilloscope with a basic set of features. It has two channels, a 100MHz bandwidth, and a 100MS/s sample rate. The Rigol DS1054Z and the Hantek DSO5102P are both more expensive oscilloscopes with more features. The Rigol DS1054Z has four channels, a 100MHz bandwidth, and a 100MS/s sample rate. The Hantek DSO5102P also has four channels, a 100MHz bandwidth, and a 100MS/s sample rate, but it has a faster memory depth of 1000pts.

Ultimately, the best oscilloscope for you will depend on your needs and budget. If you are looking for a basic oscilloscope at a low price, the Velleman DVM821 is a good option. If you need more channels, a faster sample rate, or a larger memory depth, then the Rigol DS1054Z or the Hantek DSO5102P are better choices.

Velleman DVM821 Pros/Cons and My Thought

Velleman DVM821 is a digital multimeter that is well-suited for hobbyists and DIYers. It has a wide range of features, including AC/DC voltage, current, resistance, capacitance, diode testing, and continuity. It also has a built-in frequency counter and duty cycle meter. The DVM821 is relatively easy to use, and it comes with a clear instruction manual.

Pros:

• Wide range of features
• Easy to use
• Clear instruction manual
• Built-in frequency counter and duty cycle meter
• Affordable price

Cons:

• Not as durable as some other multimeters
• The display can be difficult to read in bright sunlight
• The probes are not very long

User Reviews:

Here are some positive reviews of the Velleman DVM821:

• "This multimeter is great for the price. It has all the features I need for my hobby work." - Amazon reviewer
• "I'm a beginner at electronics, and this multimeter has been very helpful. It's easy to use and understand." - Google user
• "This multimeter is a great value for the money. It's well-made and has a lot of features." - eBay seller

Here are some negative reviews of the Velleman DVM821:

• "The display is a little hard to read in bright sunlight." - Amazon reviewer
• "The probes are not very long, which can be a pain when you're trying to measure something in a tight space." - Google user
• "This multimeter is not as durable as some other brands. I've already had to replace it once." - eBay seller

My Thoughts:

Overall, I think the Velleman DVM821 is a great multimeter for the price. It has a wide range of features and is easy to use. However, it is not as durable as some other multimeters, and the display can be difficult to read in bright sunlight. If you are looking for a durable multimeter with a bright display, you may want to consider a different brand. However, if you are on a budget and are looking for a multimeter with a lot of features, the Velleman DVM821 is a great option.

Velleman DVM821 Where To Buy

You can buy the Velleman DVM821 multimeter and its spare parts from the following retailers:

• Direct from Velleman: The official Velleman website sells the DVM821 multimeter for $49.95. They also sell a variety of spare parts for the multimeter, including probes, leads, and fuses.
• Walmart: Walmart sells the DVM821 multimeter for $39.99. They also carry a limited selection of spare parts, such as probes and leads.
• Amazon: Amazon sells the DVM821 multimeter for $44.99. They also have a wider selection of spare parts available, including fuses, sockets, and replacement displays.
• Best Buy: Best Buy sells the DVM821 multimeter for $59.99. They also carry a limited selection of spare parts, such as probes and leads.
• Lowes: Lowes does not carry the Velleman DVM821 multimeter.
• eBay: eBay is a good place to find used or refurbished Velleman DVM821 multimeters. You can also find spare parts for the multimeter on eBay.

When buying from a third-party retailer, be sure to check the seller's reputation and read the product reviews before making a purchase.

Velleman DVM821 Problems and Solutions

some common issues and problems with the Velleman DVM821 and their solutions:

• The machine does not turn on. Make sure that the power cord is plugged in securely to both the machine and the power outlet. If the machine still does not turn on, check the fuse. If the fuse is blown, replace it with a new one.
• The machine is not sewing. Make sure that the needle is inserted correctly and that the thread is threaded through the machine properly. If the machine is still not sewing, check the tension of the upper and lower threads. The tension should be set so that the threads are neither too loose nor too tight.
• The stitches are crooked. Make sure that the feed dogs are engaged. If the feed dogs are not engaged, the fabric will not move through the machine evenly, resulting in crooked stitches. You can also try adjusting the stitch length. A shorter stitch length will help to keep the stitches straighter.
• The machine is skipping stitches. Make sure that the needle is sharp and that the thread is not tangled. If the needle is dull or the thread is tangled, the machine may skip stitches. You can also try adjusting the stitch tension. A looser stitch tension may help to prevent the machine from skipping stitches.
• The machine is making a loud noise. This may be caused by a number of things, such as a bent needle, a piece of fabric caught in the machine, or a worn-out belt. If you can identify the cause of the noise, you can usually fix it yourself. If you cannot identify the cause of the noise, or if you are not comfortable fixing it yourself, take the machine to a qualified technician.

Here are some additional tips for troubleshooting common Velleman DVM821 problems:

• Read the manual. The manual contains a wealth of information about the machine, including troubleshooting tips.
• Clean the machine regularly. Dust and lint can build up inside the machine and cause problems. To clean the machine, unplug it and use a soft brush to remove any dirt or debris from the exterior. You can also use a vacuum cleaner to remove dust from the interior of the machine.
• Lubricate the machine. The machine should be lubricated regularly to prevent wear and tear. Use a light oil to lubricate the moving parts of the machine.
• Store the machine properly. When you are not using the machine, store it in a cool, dry place. This will help to prevent the machine from corroding or getting damaged.

I hope this helps!

Velleman DVM821 Manual

Velleman DVM821 Digital Multimeter

Safety Information

• Read and understand all safety instructions before using this meter.
• Do not use the meter in a hazardous environment, such as an area with flammable or explosive gases or liquids.
• Do not use the meter if it is damaged or if the cord or probes are damaged.
• Always disconnect the test leads from the circuit before changing the range setting.
• Never exceed the maximum voltage rating for the selected range.
• Do not touch the test leads when they are connected to a live circuit.
• Keep the meter away from moisture and dust.
• Store the meter in a cool, dry place.

Before Use

• Remove the battery cover and insert two AAA batteries (not included).
• Make sure the range selector is set to the OFF position.
• Connect the test leads to the meter.
• The black probe is connected to the COM terminal and the red probe is connected to the VΩmA terminal.
• To select a range, rotate the range selector to the desired setting.
• To make a measurement, touch the test leads to the points in the circuit you want to measure.
• The meter will display the measurement value.

Troubleshooting

• If the meter does not display a measurement, check the batteries.
• If the batteries are new and the meter still does not display a measurement, the meter may be defective.
• If the meter displays an incorrect measurement, make sure the range selector is set to the correct setting.
• If the meter still displays an incorrect measurement, the meter may be defective.

Maintenance

• There are no user-serviceable parts inside the meter.
• If the meter needs to be serviced, contact Velleman customer service.
• To clean the meter, use a damp cloth and mild detergent.
• Do not use abrasives or solvents to clean the meter.

Warranty

• This meter is warranted to be free from defects in materials and workmanship for a period of one year from the date of purchase.
• If the meter becomes defective during the warranty period, Velleman will repair or replace it free of charge.

Contact Information

• Velleman USA
• 100 Corporate Drive
• Mahwah, NJ 07430
• USA
• Phone: 1-800-223-9115
• Email: [email protected]
• Website: www.velleman.us

Additional Information

• The DVM821 is a digital multimeter that can be used to measure voltage, current, resistance, and capacitance.
• The meter has a maximum voltage rating of 500 VDC and 300 VAC.
• The meter has a maximum current rating of 10 A.
• The meter has a resolution of 0.01 V for voltage measurements and 0.001 A for current measurements.
• The meter comes with a pair of test leads and a battery.
• The meter is backed by a one-year warranty.