Digital multimeter mastech ms8233c: brief instructions. Conclusions and impressions
Greetings to all friends on the website “Electrician in the House”. I think each of us has found ourselves in a situation where it was necessary to measure electrical parameters, but there was no suitable device at hand. For example, how to measure the voltage on a dead battery or check the integrity of a heating element? Many people ask friends or neighbors for help.
For these purposes, you need a multifunctional device that is suitable for both amateurs and professionals.
Today I would like to present you with a review of one measuring device that I was lucky enough to work with - this digital multimeter pencil type MS8211 from the KVT company. Despite its compact size, this tester has quite a lot of functionality and is very easy to use.
The size and shape of the MS8211 multimeter, designed as a test pen, makes it unique among its counterparts with a rotary switch.
We have to find out how unique and functional it is, so today we will conduct a review and analyze how to use multimeter MS8211 when measuring quantities such as voltage, current, resistance, etc.
How to use a digital multimeter
As I said today, we’ll look at a digital multimeter, which is more suitable for electricians than for electronics engineers. Why for electricians? In terms of measuring electrical quantities, it has all the functions that are present in conventional multimeters (measuring current, voltage, resistance, continuity). But the main difference lies in the external design.
By design, it resembles a two-pole voltage indicator, which is convenient for electricians to work with. After all, in fact, what measurements are performed by electricians most often? Probably in 90% of cases this is a check absence/presence of voltage Before performing any work, the remaining 10% is to check the continuity of the circuit or measure the resistance.
Convenience lies in the ability to work with both hands. Take two poles (probes) in your hands and take measurements, for example checking the absence/presence of voltage in the outlet. And at your fingertips you can immediately see the readings on the display.
AC voltage measurement
Where can you find alternating voltage in an apartment? The closest outlet is correct. How to check the voltage in an outlet digital multimeter?
To measure alternating voltage, in addition to setting the switch to the appropriate position, it is necessary to switch the device to the “AC” mode. To do this, press the “FUNC” button. We leave the measurement mode to automatic.
We look for a socket and insert two probes into its sockets. This is what I told my friends about at the very beginning. These types of tools are very convenient for electricians to work with.
On the display you can see that measured AC voltage at the outlet is 226 Volts.
By the way, compared to constant voltage, there is no polarity here. That is, it makes no difference into which socket of the socket the red and black probes are inserted.
Now let's measure the AC voltage in the electrical panel between two phases. Let me remind you that in this case it should be about 400 Volts.
As you can see, the linear voltage in the floor panel is 383 Volts.
How to check resistance with a multimeter
Now friends, let's look at how to use the MS8211 digital multimeter when measuring resistance and continuity.
Set the switch to the “Ω” mark. Use the “FUNC” button to set the “AUTO” mode (it will be set automatically).
Before checking the resistance with a multimeter, you need to make sure that the circuit (wires, probes) is intact; to do this, we connect the probes to each other. The display should show zero readings.
Let's measure the resistance nominal 5 kOhm. We connect the probes to the resistor terminals. The measured resistance is 5.05 kOhm.
Similarly, we measure resistors with a nominal value of 10 Ohms and 50 kOhms. The data can be seen in the photo.
Let's check the integrity of the cable cores by ringing them with a digital multimeter. To do this, use the “FUNC” button to switch from the “AUTO” mode to the sound signal mode (the corresponding icon will appear on the display).
Let me remind you that in the “buzzer” mode the sound signal will sound if the resistance of the circuit being tested is no more than 50 Ohms. For comparison, the resistance of 1 meter of cable with a cross section of 1.5 mm2 is about 0.12 Ohm. For a cross section of 2.5 mm2 the value is about 0.0074 Ohm/m. That is, in order to exceed the specified limit, a cable with a cross-section of 1.5 mm2 must be more than 4 km, and for a cross-section of 2.5 mm2 - more than 6 km.
The cable was tested successfully, all cores were intact.
To test the diodes, you must press the “FUNC” button; the corresponding symbol will appear on the display.
I have a 1n5408 brand diode. The voltage drop across it is 0.49 V.
DC current measurement
Now let's look at how to use a digital multimeter when measuring DC current. To be honest, I am a little upset by the measurement limits, which are only 200 mA for the “AC” and “DC” modes.
Set the switch to mA mode. The display will show “AUTO” and “DC”, indicating automatic DC current measurement mode. Just what we need.
Let's measure the current in the circuit of my homemade dialer. The light bulb used here has a voltage of 6.3 V and an operating current of 0.22 A. We connect the continuity tester to the probes of the device. And... sad. The blocking is triggered when the measured parameter is exceeded. The display shows “OL” and an intermittent beep sounds. Please note, friends, the light bulb continues to shine!
Let's try to measure the current consumption of the LED strip connected to the power supply. We connect the tape to the power supply in series with the device. According to calculations, the current is about 2 A. We look at the device.
Measuring AC Current with a Digital Multimeter
To switch the device to the alternating current (“AC”) measurement mode, you must press the “FUNC” button once.
I will use a 20 W LED light bulb as an AC source. We assemble the circuit in series with a light bulb and a multimeter.
According to calculations, the current should be about 88 mA. The readings can be seen on the display.
Let's now measure the current with a multimeter in the circuit of a 7 W LED lamp.
Now we use a 40 W incandescent light bulb.
Now let's take a regular incandescent lamp - 60 W. The current in such a circuit will be about 260 mA. Let me remind you that the current measurement limit is 200 mA. Let's see if he can digital multimeter MS8211 measure the current at such a load.
Non-contact voltage test function
To activate this function, the switch must be moved to the “NCV” position. Now, if you bring the device to a live wire, an intermittent sound signal is emitted and the light indication begins to flash.
What can you say about the sensitivity of this function? If you look for a wire in the wall, there is practically no sensitivity (in any case, I was not able to find a single wire in the apartment). A signal goes off near the installed sockets, you start moving along the intended route - it goes silent.
Near an openly laid energized cable, the indication begins to operate at a distance of 5-10 mm from the cable. If you use this function to indirectly determine “there is voltage or not,” then the device will be enough for this.
The MASTECH MS8229 digital multimeter is a universal measuring tool and is an indispensable assistant for both repair and maintenance of various electronic devices.
If you buy every necessary measuring tool, firstly, they will take up useful space in your bag or desk drawer, and secondly, the cost of each purchased tool will be unjustifiably high for a tool that I will only use occasionally.
This multimeter combines 5 measuring instruments, in addition to a conventional multimeter (measuring DC and AC current, DC and AC voltage, resistance), it can also measure temperature, humidity, sound field level and ambient light level. This model has been produced for several years now and reviews of this multimeter are both positive and negative, but I am an amateur and a small error in the readings suits me quite well, so I purchased this particular model.
Specifications
The parcel arrived standard, a gray bubble bag, the packaging was slightly wrinkled.
The package includes the multimeter itself, good quality probes, an external thermocouple, 3AAA batteries, instructions in English and a certificate for the device with a test date of 2014.9.3. What's missing is a belt clip case.
A couple of years ago I bought a simple multimeter for home to replace an old one, in which the rotary display had broken and the battery had run out. I bought a small rubberized one with a foot; a second multimeter will not be superfluous, since sometimes you need to take measurements and take two readings of different parameters at once.
The display of the MASTECH MS8229 is larger than that of a small multimeter, but the height of the numbers is the same, humidity and temperature readings are displayed on top, and when switching the circular switch of measurement modes, these readings are always visible, the temperature can be displayed in °C and °F. The manufacturer also provided the display with backlighting, which is very convenient in low light conditions. The backlight turns on when you hold the green HOLD/B.L button for a long time, but inconvenience arises, since the readings are recorded and in order to continue using the multimeter you need to briefly press the button again.
In order not to describe all the assignments of the keys of this multimeter, I suggest you read them in.
I would like to note several important functions that this multimeter has, namely: sound and light warnings, which teach and help those who have not yet figured out how to use the multimeter correctly, when switching measurement modes, a red backlight lights up at the bottom, around the probe terminals, indicating thereby exactly where the probes should be connected.
It is worth paying attention, since different stores supply the device in different configurations, and if you decide to purchase MASTECH MS8229, check with the seller what is included in the kit and what probes, I received other, but very good probes, marked on the cable 1000V 18 AWG, resistance 0.2 Ω. For comparison, I put them side by side from left to right: good probes with a thin tip, probes from a multimeter kit, cheap probes from an inexpensive multimeter kit.
The weak point of all multimeters is the probes; cheap ones usually have high internal resistance; I recommend replacing them with better ones. The probes from a cheap multimeter do not go in all the way, and the terminal illumination does not turn off, but this does not interfere with the operation of the device itself.
All built-in measuring sensors are located on the top end of the multimeter: temperature sensor, humidity sensor, microphone and lux meter.
● Lux- in this mode, the lux meter is turned on, then you need to install the multimeter at a short distance from the light source, real-time measurements will be visible on the display.
● dB- in this mode the noise level is measured. Using the built-in microphone, I measured the noise of the operating fans in the system unit, the readings are 50.3 dB, the fan tx indicates the noise level, now I can roughly imagine how much noise is in the indicated numbers.
● TEMP- in this mode you can measure temperature using a thermocouple. This thermometer is good because it is not afraid of high temperatures and you can measure the open flame at the burner. The thermocouple is connected to the probe connectors.
The multimeter itself runs on 3 AAA batteries, which are included in the package, but I immediately replaced them with higher quality batteries. The battery compartment is located at the back under the folding leg; to install the batteries you need to unscrew 2 screws. There is also a 10A fuse there.
Now let’s take a closer look at what the multimeter itself consists of and open it. To do this, you need to remove the green rubber casing and unscrew the 4 bolts. There are 10 tuning resistors inside; I do not recommend changing the factory settings.
The manufacturing quality of the printed circuit board is not bad, the installation was done neatly, the flux was washed off, and the plastic molding was good.
If you are not interested in this functionality, then you may like the younger model MASTECH MS8228, which has an infrared thermometer, but does not have a lux meter.
And if you need to reset the readings to a computer, here is an example of how you can connect a multimeter via RS232.
Conclusions and impressions
The MS8229 multimeter is universal and, despite its relatively small size, contains various measuring instruments that are useful for hobbies or in the household.
There is currently no way to measure the correctness of measurements of built-in devices, since there are no such devices at hand.
If you have any questions, please ask, I will be happy to answer. I'm planning to buy +96 Add to favorites I liked the review +64 +129
Today we are reviewing a multimeter. This is a 5 in 1 multimeter and is notable for the fact that in addition to the basic standard functions of a multimeter, it has the ability to measure temperature and humidity, light, and sound field. The multimeter has automatic and manual selection of measurement limits, and allows you to measure direct and alternating current and voltage, resistance, capacitance, frequency and duty cycle, diode test and audio continuity.
The multimeter arrived in a box with a lot of Chinese characters. The packaging itself was a little wrinkled (Russian Post should not be blamed, since it was delivered by SDEK), but everything inside was safe and sound. I have an assumption that the parcels are still crumpled by Chinese Post.
The multimeter includes: probes, thermocouple, 3 AAA batteries, instructions in English, control card.
Part of the body is covered with a dense rubber coating. The multimeter is quite weighty - about 400 g.
At the bottom there are grooves for inserting probes, as well as a stand.
At the front end of the MS8229 there are sensors: temperature and humidity, lighting, sound.
The multimeter screen has a backlight, which is turned on by holding the HOLD/BL key for more than two seconds.
When switching between modes, the probe sockets are illuminated. In this case, the multimeter determines whether the probe is inserted into the socket or not, and if it is inserted into the wrong socket, the device emits a light and sound signal. Those. There is foolproof protection, I think beginners will positively appreciate this functionality.
The selection of submodes is carried out using the "Select" button.
By default, automatic selection of the measurement range works, but in some modes (resistance, capacitance, etc.) performance leaves much to be desired, so using the "Range" button you can switch to manual range selection. At the same time, the display speed increases noticeably.
Testing
Let's start by measuring DC voltage. To do this, let’s take the ION on the AD588BQ chip, whose temperature drift does not exceed 1.5 ppm/°C, with an output voltage of 5V and 10V. To be more precise, 5.00031V and 10.00027V (measured using an Agilent 34401A multimeter).
Next, we measure the alternating voltage. The HOPI device's readings are more accurate. The MS8229 multimeter overestimated the voltage by 4 volts. Just in case, I compared the readings with a desktop multimeter with True RMS (although this plays practically no role here) and a UNI-T multimeter - the Mastech showed a voltage that was 4-5 volts higher than them.
Signal shape - sinusoid, signal frequency 55 kHz:
As you can see, everything is quite accurate. Now switch the multimeter to the duty cycle measurement mode (Duty), and set a rectangle on the generator with a frequency of 500 Hz and a duty cycle of 14%.
Tests have shown that the multimeter measures frequencies up to almost 100 kHz.
In the diode test mode, the forward voltage drop across the diode is measured, and the measured voltage for testing the diode was 1.6 Volts.
Resistance measurement 500 Ohm, 8.571 kOhm, 200 kOhm, 2.5 MOhm. A bank of high precision resistances (0.01%) from Vishay and TDK is used.
The capacitance measurement range of this model is quite narrow - it starts from several nanofarads and does not even reach 100 μF. For a 1000 pF capacitor it showed 1.5 nF (he refused to measure smaller values), and for a 100 µF electrolyte it also showed OL.
The photographs below show measurements of capacitors with nominal values: 10 nF, 0.1 µF, 1 µF and 10 µF.
There are no complaints about the temperature measurement of the multimeter - it shows the temperature quite clearly, a comparison was made with a Chinese meter and a Fluke multimeter in the range of up to 500 ºС (heat gun).
I can’t say anything about measuring the sound field level - because... there is nothing to compare with. During the day, with the computer turned on (the fans are quite noisy), it shows a level of ~40 dB.
But the light sensor does not show it very accurately. MS8229 constantly underestimates the value. Comparisons were made with a Chinese lux meter and a homemade device based on a digital sensor
Many users buy a mastech ms8233c multimeter, but do not know how to use it or how to take measurements. This brief overview and instructions will help you understand the basic issues regarding the operation of the device.
Short review
The mastech ms8233c digital device is a specialized meter that has a 3.5-digit backlit LCD screen, a low battery indicator, overload protection, and a built-in voltage detector.
A multimeter measures DC or AC voltage, current, resistance, temperature
In addition, the device performs an audible test of circuit conductivity, non-contact detection of hidden wiring, tests diodes and records the results on the indicator.
This device is a multifunctional tool that is widely used in everyday life and small households.
Characteristics and equipment
- constant voltage - 200 mV/2 V/20 V/200 V/600 V;
- alternating voltage - 200 V/600 V;
- constant current - 200 μA/20 mA/200 mA/10 A;
- resistance - 200 Ohm/2 kOhm/20 kOhm/200 kOhm/2 MOhm;
- temperature range - -20…1000°C/ -4…1832°F;
- indicator digit: up to 2000;
- power supply: 9 V (type 6F22, 6LR61, Krona).
The device kit includes:
- universal multimeter;
- probes;
- temperature sensor type K (P3400);
- instructions.
Measurements of physical quantities
Before work you need to do the following:
- Insert the battery into the device.
- Place the multimeter on a flat surface using the support on the back of the device.
- Inspect the device, all probes, and conductor insulation for mechanical damage.
- If the parameter of the signal being tested is unknown, turn the switch to the highest range.
- Before measuring current, you must check the fuse, turn off the power to the circuit before connecting it to the devices being tested.
To measure DC or AC voltage, you must follow the instructions:
- Connect the black probe to the COM input jack, connect the red probe to the V input.
- Set the switch to the voltage measurement position.
- Also attach probes to the voltage source being measured.
- Numbers will appear on the indicator.
- Take readings. If desired, you can lock them by pressing the HOLD button.
First, fluctuating readings appear on the meter screen at a low voltage range, since the meter is a highly sensitive device. But when connecting the probes, the real result will appear.
The value OL may appear on the screen. It means that the readings have exceeded the range, so it is expanded.
Before measuring AC or DC current, you must turn off the power to the circuit under test. Then connect the meter to the circuit in series.
To carry out the current measurement procedure, do this:
The temperature in the device is measured on 2 scales: Celsius and Fahrenheit. Accordingly, fix the multi-position switch at the level of the scale whose result you want to obtain: °C or °F. Connect the red thermocouple wire to the VmA input, the black wire to the COM input jack. Record the temperature value.
Diode testing and non-contact voltage detection
The meter indicates the voltage drop across diodes, transistors and other semiconductor devices.
To check semiconductor diodes, you need the following:
- Connect the black probe to the COM input, the red probe to the VmA input.
- Set the multi-position switch to the diode test position.
- Connect the red probe to the anode of the diode under test, connect the black probe to the cathode.
- Clear the diode forward voltage drop option that appears on the screen. If the probes are open, the indicator will show OL.
Non-contact detection of hidden wiring is an additional function of the multimeter. To connect it, simply bring the top of the device to the object being tested at a distance of 40 mm. When the device detects the voltage, the LED will indicate.
The high input resistance does not introduce any significant deviations in the measurement process and this shows the high accuracy of the multimeter.
The device uses an ADC with measurement of values using the double integration method.
A multimeter is a high-quality, convenient, understandable device for home use. But when working with it, electrical safety measures should not be neglected. If you properly care for the device and follow all the rules of safe use, it will last a long time and without problems.
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Revolutionary in its capabilities tsdigital multimeter Mastech MS8229 combines five measuring instruments with unsurpassed characteristics. In addition to the basic functions of a multimeter (measuring DC and AC current, DC and AC voltage, resistance ), MS8229 allows you to measure temperature, humidity, sound field level And ambient light level. The device fully complies with the international standard IEC1010-1 CATII 1000V / CATIII 600V. Mastech MS8229 has the ability to automatically or manually select measurement limits. The device has a large 3 3/4 digit LCD display with backlight. The results obtained can be recorded using the DATA HOLD function. By using digital multimeter MS8229 you can check semiconductor diodes and test electrical circuits. Nutrition multimeter Mastech MS8229 is carried out from a 9V battery of the Krona type. The device will automatically turn off after a certain time after the last measurements taken.
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