Sinometer DT830B Digital Multimeter 20-Range DMM Review

February 15, 2012 web Measurement Tool

The DT830B is an incredibly popular digital multimeter, not least for its highly affordable price tag and versatile feature set, which covers many of the general requirements that DIY’ers and hobbyists may have. It is not a professional product but serves well as a basic and reasonably accurate multimeter for home and auto use. It measures a mere 5.0 x 2.8 x 0.9 inches, weighs little and comes with 20-range DMM and built-in battery tester.


For those purchasing this device primarily to test batteries, it should be noted that some users have had issues in this regard–particularly when measuring rechargeable NiMh batteries. It is actually specified for 1.5V and 9V batteries, which implies that lower-voltage rechargeable batteries may pose a problem.

The instruction manual included with the unit is somewhat lacking in scope, so the user is assumed to have a decent grasp on how to use the product.

It takes a little longer to get a stable reading with the DT830B as opposed to e.g. a Fluke multimeter,but the readings seem to be surprisingly accurate considering the very low price.

Since this multimeter costs a mere fraction of a professional-grade product, it has to be said that it delivers great value for money. For the user who just needs a multimeter occasionally, the DT830B is a good device. It is easy to carry around or stuff in the tool box and is fairly accurate as well
as durable in spite of its low weight.

Features
20-range AC/DC V and DCA multimeter
1.5V and 9V battery tester
Ultra compact design
Diode check and transistor tester
One year warranty

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Sinometer MAS345 Digital MultiMeter Review

February 6, 2012 web Measurement Tool

The Sinometer MAS345 is a digital multimeter with a computer interface included. This instrument is designed to accommodate all common functions of a DMM. It measures voltage and ampere of both AC and DC categories. It finds resistance in ohms. In addition to those it measures capacitance and temperature. It works for testing diodes, transistors and circuit continuity also. The brilliant extra feature is its computer interface function. So you get the scope to store and analyze the measured data on your PC.

Functions and Ranges

AC voltage ranges available on the DMM are 4, 40, 400 and 750V. Accuracy variation is from 1.2% to 1.5%. DC voltage has some similar ranges except the top one. It’s here 1000V. DC voltage measurement presents better accuracies that run from 0.5% to 0.8% only. Another vital function is ampere measurement. You may have 3 ranges in measuring both AC and DC currents. The spans are 4mA, 400mA and 10A. Accuracies here also mimic voltage measurement, which is a bit better in DC than in AC.

This multimeter can measure ohms in six ranges, starting from 400 ohms and finishing at 40Mohms. Accuracy for first five ranges is 1.2% and that for the last one is 3%. Your capacitance measuring tool has got two ranges and its correctness swings between ± 4.0%. You can measure a temperature as high as 750°C with this tool at an accuracy of 3.0%. The meter MAS345 is able to test continuity with buzzer signal. It can test diodes and transistors also.

Features

This DMM MAS345 has the features outlined below:

1.Auto range selection
2.Overload indication and protection
3.Conformity with IEC 1010 standard
4.PC-interfaced
5.1 month money return guarantee and 1 year warranty

This electronic tool serves your most of the testing and measuring purposes with acceptable accuracy. It looks great in an all black design. The package contains the instrument, test leads, software CD-ROM,RS232 cable and instruction manual. You may grab one for your everyday use, as the price is also within reach of most potential users.

Features

1.PC-interfaced digital multimeter with 3 3/4 digits LCD display, temperature and capacitance measurement
2.Auto ranging with very good sensitivity, resolution and accuracy
3.Overload indication and protection, low battery indication and back light
4.In full comformance with IEC1010 Standard
5.30 days money back guarantee & 1-year manufacturer’s warranty

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Mastech Multimeter MS8264 (Manual 30-Range + Temperature)

January 31, 2012 web Measurement Tool

The MS8264 is a newly released model from Mastech and there is no full review available yet. Here is a short summary of the product:

Mastech’s MS8264 is a 30-range (manual) digital multimeter with a full range of features including all the usual functionality and then some; AC/DC Voltage and Current, Capacitance, Resistance, Frequency, Temperature and other features. In short it can be considered an entry-level professional model or a proper product for hobbyists and DIY’ers.

It’s also highly affordable considering the feature set, which also includes back lighting, data hold and a resettable fuse instead of the regular replaceable fuse that renders the unit useless in case you don’t have a spare on hand. It also comes with test leads that have capped tips and shrouded plugs, a K-Type Temperature probe and a multi-functional socket. A 9V battery is pre-installed and it naturally comes with a user manual.

Features:

Conforms to the IEC1010-1 standard CAT III 600V and CAT II 1000V
SMT application
Display: 1999 counts
Automatic indication of functions and symbols
Diode test
Continuity test
Auto power off
Resettable fuse inside
Data hold
Back light

Specifications:

DC Voltage: 200m/2V/20V/200V±0.5%, 1000V±0.8%
AC Voltage: 2V/20V/200V±0.8%, 750V±1.2%
DC Current: 20mA±0.8%, 200mA±1.5%, 10A±2.0%
AC Vurrent: 2mA±1.0%, 200mA±1.8%, 10A±3.0%
Resistance: 200/2k/20k/200k/2MΩ±0.8%, 20MΩ±1.0%, 200MΩ±5.0%
Capacitance: 20n/200n/2μ/20μF±4.0%
Frequency: 20kHz±1.5%
Temperature: -20°C ~ 1000°C
hFE: 1~1000

Features:

Conform to the IEC1010-1 standard CAT III 600V and CAT II 1000V
SMT application.Display: 1999 counts.Data hold .Back light
Automatic indication of functions and symbols .Diode test.
Continuity test.Auto power off.Resettable fuse inside.
Temperature: -20°C ~ 1000°C

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Security IP Cameras Can Be Seen Everywhere

January 31, 2012 admin Camera & Photo

Nowadays, you can see security camera everywhere like the hustle and bustle streets, crowed stores, quiet road, even some home yards. When human being enters the industrial era, problems and issues flood and become more complex.

When we refer to the bank, people are easy to think of the surveillance cameras and safeguards wandering around. There is still certain bravery to take money from the bank under the surveillance. Money is always enchanted and the ever topic. Here shows you the video security camera for bank use. In the bank, there are more than one security cameras. To be exactly,there is one video camera in each corner and the important place. In this way, all the images can be recorded clearly. Andall of the cameras are working together all the time even though nobody is there. Usually we can see that there is a big screen that displays all the sceneries from different angles and corners. This is known as a panning room. Another potential criminal place is around the ATM. There are equipped with the security camera, too. Places with money are indispensible to add more security camera to keep close watch with the atmosphere around.

The supermarket is the place that welcomes video camera. Frequently, supermarket is the place spammed with people. It is difficult to watch some shoplifters. Video security camera does a great favor to reduce the heavy load of artificial observation. It saves more manpower and material resources. Other places like shopping malls, department stores and so on are the same situation. They prefer the surveillance camera. In the public place where are flowed by people, they are usually equipped with security video for the sake of safety.

As to some home yard, it is not rare to see that security camera is on duty. For some villas and high-class apartments, they are all under the suspect of the security camera. Some give it a vivid name the electronic eye. For the one reason, it is not expensive to purchase one. Another one is that the insecurity society. It is available to make full use of this gadget to safeguard our life.

After all, all the gadgets can be accessible for most people. Then you can see the video security camera everywhere. The prevailing is due to the broad application and accessibility. More items can be seen at ChargerBuy.com.

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Shop on the Internet for Electronics for Christmas Gift

December 1, 2011 admin Business Profile Article

HisGadget.com – Your online shopping superstore for Consumer Electronics & Gadgets. Comparison shopping for the best price.

Want to find Electronics Gift & Gadget? Want to find Hot Price Offer? This year, in the thick of the holiday season, HisGadget.com is dedicated to helping you find creative gift ideas.

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Laptop LCD Screens Quality -Easy to Take

November 20, 2011 web LCD Screen Panle

It is easy to take the quality of LCD screen for granted. But when you consider that you probably spend more time using your LCD monitor than any other component of your PC, you realize that the screen you stare at every day is a vital part of your computer system. What differentiates one LCD from another is image quality. Such parameters as, text readability, sharpness, grayscale range, color quality, or image uniformity are important. However, the most important tool (diagnostic equipment) to evaluate the quality of LCD screen is the human eye.

The variables, such as, the light source, the viewing angle, and the system’s graphics card can have a dramatic effect on an LCD’s performance. Make sure that a display is adjusted to perform optimally, based on the manufacturer-recommended or default settings when possible.

laptop lcd screen

LCD screens often have trouble reproducing all of the levels of the grayscale (the range of grays between true black and true white). When producing a bright white image, many LCD screens oversaturate the grayscale: the lightest grays of the scale are lost in the white background. Oversaturation can also lead to loss of color range – a poor color reproduction of an LCD screen at the brightest end of the scale, closest to white. A color-tracking error occurs when the intensity of red, green, and blue (RGB) does not adjust identically with signal-level changes for LCD screen. This lack of balance between the RGB channels affects color as well as grayscale, but it is most easily identified as a shift in color within shades of gray.

Perfectly uniform backlighting across an LCD’s entire display surface is difficult to achieve. It is not uncommon for an LCD to have bright or dim patches or subtler variations in color intensity, which give the appearance of shading across the screen, or variable color intensity on the LCD display. Additionally, using a dark screen is the easiest way to spot glare and reflection problems, both of which can have distracting effects when you’re viewing an LCD screen.

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Correct Backlight Type For Your New Screen

November 14, 2011 web LCD Screen Panle

All laptops in late 2010 use LCD screens:

LCD screens require a backlight system to operate, there are two backlight systems in use today: CCFL and LED

CCFL – Cold Cathode Fluorescent Light, is an older backlight method, which utilizes a daylight specter fluorescent tube and an inverter which powers it.

LED – is a newer backlighting system which does not use an inverter, and instead of a fluorescent tube it uses a strip of LEDs (Light Emitting Diodes).

So in essence there two types of laptop screens: LCD-CCFL and LCD-LED: these screens are NOT INTERCHANGEABLE.

Laptop manufacturers tailor their system for a particular LCD screen, so it is impossible to install a CCFL screen into a computer outfitted for an LED screen, and vice-versa.

The replacement screen must have exactly the same backlight type as the original (old) screen. Currently there are 2 major types of backlight for notebook LCD screens:

1. CCFL (Cold cathode fluorescent lamp)
a) 1-CCFL – contains 1 bulb
b) 2-CCFL – contains 2 bulbs

2. LED (Light emitting diode)

IMPORTANT! CCFL and LED screens are NOT interchangeable!
The CCFL backlight screens always need a high voltage inverter to power the bulb inside the screen. The LED screens use light emitting diodes to light up the screen. Most of the LED screens today require an inverter as well and the inverters of the two types are completely different. Inverters of the LED screens are attached to the bottom of the screen.

One CCFL (also known as “single backlight”) – has been and still is the most popular backlight type in laptop screens. The screen contains one bulb to light it up and has a pair of wires at the bottom finished with one white inverter connector that plugs into inverter board.
See the picture right below:
laptop screen single backlightLCD screen with single CCFL backlight ( CCFL 1-Bulb )

Two CCFL (also known as “dual backlight”) – contains 2 bulbs, has 2 pairs of inverter cables and 2 inverter connectors. This type of backlight is less popular than 1-CCFL and is used in laptop screens of size 15.4-inch and larger.
See the next picture:
laptop screen dual backlightsLCD screen with dual CCFL backlight ( CCFL 2-Bulb )

LED is the new type of backlight which allows the screen to consume less power (which equals longer battery life), does not heat up as much as CCFL based screen, and is thinner and lighter. In LED screens backlight power is supplied in one of three ways: through video connection, through a flat ribbon cable or through an attached inverter. Also note that in LED screens of different resolutions the video connector can be entirely different.
led laptop screenLCD screen with LED backlight ( Backlight Type: LED )

It is usually mentioned in the laptop specifications when the laptop screen has LED backlight.
To determine which backlight type screen is in your laptop you can remove and examine the screen – this is the best way. Alternatively you can check your laptop manual, check specifications online at your laptop manufacturer’s Support section, or contact your laptop manufacturer.
LED screen can never be used to replace a CCFL screen.
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Instructions For Measuring Laptop Screen Size

November 10, 2011 web LCD Screen Panle

Important Note!
It is absolutely necessary to know the SIZE, RESOLUTION and BACKLIGHT TYPE in order to purchase the correct laptop screen.

Certain laptop models come in different screen sizes. For instance, IBM-Lenovo ThinkPad T60 was released with either 15.4″ or 15″ or 14.1″ screen size and these screens are not interchangeable.

It is absolutely imperative that size, resolution and backlight of the original screen are the same as of the selected screen for purchase.

Below are instructions for Measuring laptop screen size

Screen size is measured in inches, diagonally from corner to corner (see below) (1 inch=2.54 cm):

laptop Screen size-2Laptop screens come in many different sizes with new ones being constantly added. Below you can see the most popular ones.

laptop screen size

 

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Plan Now for Thanksgiving- Hot Price & Savings

November 7, 2011 admin Business Profile Article

HisGadget.com – Your online shopping superstore for Consumer Electronics & Gadgets.

Want to find Hot Price Offer? HisGadget.com is kicking off two weeks of savings, typically reserved only for the Thanksgiving, on this seasons’ must-have holiday gifts, including the strongest “hot price” guarantee in the market.

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Ways of Finding Your Screen Resolution

November 4, 2011 web LCD Screen Panle

Laptop screen resolution is measured in horizontal and vertical pixels (ex.: 1024 x 768).
It is important to confirm the screen resolution before submitting an order: the same laptop model can come with different display resolutions.

If a laptop you are ordering a screen for works – turn it on and:

- go to On-line Resolution Check

OR

- for Windows XP, Windows 2000, Windows ME, Windows 98: Right-Click on Desktop -> Properties -> then in Display Properties navigate to Settings
- for Windows Vista and Windows 7: Right-Click on Desktop -> Personalize -> Graphics Options

If a laptop you ordering a screen for is not functional:

- we recommend to pull your defective screen out and google screen model for specifications. You can find the screen model number on the sticker on the back of the screen.

OR

- check your laptop manual under the laptop specifications section if you have one.

OR

- also you may be able to find you laptop specifications on manufacturers website using the laptop serial number, service tag or the model number (in Support section).

One way or another you are looking for something like this (list of known laptop screens resolutions as of April 2011):
Letters on the right are the common abbreviations and can be used as resolution indicators.

2048×1536 (QXGA)
1920×1200 (WUXGA)
1920×1080 (WUXGA) Full HD
1680×1050 (WSXGA+)
1680×945 (WSXGA+)
1680×900 (WSXGA+)
1600×900 (WXGA++) HD+
1600×1200 (UXGA)
1440×960 (WXGA+)
1440×900 (WXGA+)
1400×1050 (SXGA)
1366X768 (WXGA) HD
1280×1024 (SXGA)
1280×720 (SD+)
1280×854 (WXGA)
1280×800 (WXGA)
1280×768 (WXGA)
1152×768 (WXGA)
1024×768 (XGA)
1024 x 600 (WSVGA)
1024 x 576 (WSVGA)
800 x 600 (SVGA, outdated)
640 x 480 (VGA, outdated)

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