We all know that a multimeter is an indispensable common maintenance tool for electric power workers. Using a multimeter properly will not only make our work more efficient, but also improve the safety and efficiency of our work.
1, before using the multimeter, you should first perform "mechanical zero."
2, Do not touch the metal part of the pen with your hands during the measurement process. This will not only ensure the accuracy of measurement, but also ensure personal safety.
3, under complex environment, need to pay attention to the impact of external magnetic field on the multimeter.
4, in order to improve the measurement accuracy, try to make the multimeter's pointer in the middle of the measurement. The range should be appropriate and the needle should be over half. To select the range, if it is impossible to estimate the measured size in advance, try to select a larger range, and then gradually change to a smaller range according to the deflection angle until the pointer is deflected to about 2/3 of full scale.
5, When using a multimeter to test components with positive and negative polarities such as transistors and electrolytic capacitors, pay attention to the polarity relationship. Black bears to be remembered and the black is connected with "+". The red pen is the positive pole, the black pen is the negative pole, but the black barrier pen on the power block connects the positive pole of the internal battery.
6. If the multimeter needs to shift gears, disconnect the test leads before changing gears. Measure not shift, measure finished neutral. In the measurement, the selection knob cannot be arbitrarily toggled, especially when measuring high voltage (such as 220V) or high current (such as 0.5A), so as to avoid arcing and burning out the switch contact. After the measurement is completed, the range selection switch should be set to the "" position.
7. When measuring the resistance, perform zero adjustment every time you change the resistance. When the adjustment is less than zero, replace the new battery. Test R first zero, shift need to zero. When measuring the resistance, you should first turn the switch to the electric block, short the two pens, and turn the “Ω†potentiometer to zero, so that the pointer points to zero and then measure. The ohmic zero point should be readjusted every time the electric barrier is changed.
8. When the multimeter is used up, it should be placed in the maximum block of AC voltage.
9. If you do not use it for a long time, you should take out the internal battery of the multimeter so that the battery will not corrode other devices in the watch.
10, the first look at the measurement, do not see the measurement. Each time you pick up the pens and prepare for the measurement, be sure to check the measurement category and the range selection switch for the correct position. For safety, this habit must be developed.
11, the dial should be horizontal, readings should be aligned. Use the multimeter to rotate horizontally. When reading, the line of sight should be facing the hands.
12, measuring R without electricity, test C discharge. It is forbidden to measure the resistance when the circuit to be tested is spotted. When inspecting large-capacity capacitors on electrical equipment, short-circuit the capacitors and measure them.
13, measured I should be in series, U should be measured in parallel. When measuring the current, the multimeter should be connected in series in the circuit under test; when measuring the voltage, the multimeter should be connected in parallel at both ends of the circuit under test.
14, polarity is not reversed, one hand into a habit. When measuring current and voltage, special attention should be paid to the polarity of the red and black meter pens, and it is necessary to develop the habit of one-hand operation to ensure safety.
Antenk DVI Series Digital Video Interface connectors are the standard digital interface for flat panels, video graphics cards, monitors and HDTV units. This series includes DVI-D (Digital), DVI-A (Analog) and DVI-I (Integrated Digital/Audio). Their unique crossing ground blades provide high speed performance at low cost. They are available in Straight or Right Angle PCB mount receptacles and mating male cable connectors. They support a data transfer rate of 4.95Gbps with a dielectric withstanding voltage of 500VAC. Each version features our specially designed contacts which improve signal performance and a zinc alloy shield that reduces electromagnetic interference (EMI).
Digital Visual Interface Cable Connectors
DVI ConnectorWith the advent of technologies such as DVD players, high-definition televisions, and even digital cable, the need for more advanced cables and connectors has increased. Digital Visual Interface (DVI) is one response to the growing need for interconnected systems, enabling digital systems to be connected to an array of displays. Yet DVI cables and connectors can also be complicated, and may lead to confusion between High Definition Multimedia Interface (HDMI) and DVI. Although the two systems have much in common, they service different niches of digital technology.
Digital Visual Interface
Older systems aren`t necessarily outdated systems. Although DVI preceded HDMI, it`s still widely used in both business and domestic settings. DVI connectors are designed to handle digital data transmission, incorporating three transmission channels in every connector link. The maximum bandwidth for data transfer is 165 megahertz, which is enough to relay up to 165 million pixels per second. Data is encoded for effective transfer, but a single link can handle around 4.95 gigabits per second of information. Double links can handle twice that amount.
Because a DVI cable carries information over a 165 megahertz bandwidth, complete digital resolution can be obtained. Using double link connectors increases the speed of transmission, but requires another cable. However, not many devices depend solely on a double link DVI, so this technolgy can be used on an as-desired basis.
Types of DVI Connectors
There are three general categories of DVI cable connectors: DVI-Digital (DVI-D), DVI-Integrated (DVI-I), and DVI-Analog (DVI-A). However, most connectors fall into one of the first two groups.
A standard DVI connector is 37 mm wide and has 24 pins, 12 of which are used for a single link connection. When analog is involved, four additional pins are needed to support the additional lines of an analog signal. It is not possible to cross from a digital source to an analog display or vice versa. In those instances, an integrated connector is probably the best option. There are five common types of DVI connectors.
DVI-I Single Link
This kind of connector has three rows, each with six pins. There are two contacts. Because the connector is integrated, it can be used with both analog and digital applications.
DVI-I Dual Link
A DVI-I dual link connector can also be used with both digital and analog applications, but is configured with more pins to accommodate a dual connection. There are three rows with eight pins each, as well as two contacts.
DVI-D Single Link
Specifically designed for digital applications, a DVI-D single link connector has three rows of six pins, and looks much like a DVI-I single link connector. However, a DVI-D connector has no contacts.
DVI-D Dual Link
Also made specifically for digital applications, a DVI-D dual link features more pins (three rows of eight) for dual connections. Like a DVI-D single link, a DVI-D dual link connector has no contacts.
DVI-A
This particular type of connector can only be used for analog applications, and has three rows of pins. One row has five pins, one has four pins, and the last row has three pins. Like single link connectors, a DVI-A link connector has two contacts.
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