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The accuracy of DMM readings is typically from 05 to 01 percent, and results can be displayed to two or three decimal places While this level of accuracy is not always needed for field troubleshooting of electromechanical 25
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1 LCD display with numerical readout 2 Measurement function knob 3 Soft-keys Use with measurement function knob to select measurements 4 Range button Use to set measurement range 5 Hold button Use to freeze display 6 Input connectors Note: Some DMMs have a separate function knob setting and/or input connector for A/mA
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Digital multimeter displays show numerals and graphical patterns (such as waveforms) rather than 26
swinging needles Displays are large enough to read from a distance, and some can display two or more items simultaneously, such as voltage and frequency Most DMMs have a liquid-crystal diode display that expresses readings in contrasting shades of gray Many models also have a backlighting switch for taking readings under poorly lighted areas Maximum display readouts are always one digit less than the marked range For example, the 200- resistance range reads between 00 and 1999 (Figure 2-3) If higher resistance is present, OL or 1 (overlimit or out-of-range indication) shows in the display When this happens, the rotary switch should be rotated to a higher range
Hold, Freeze, or Capture Mode
On many DMMs, pressing a hold button freezes a reading on the display screen so that the meter can be taken to a more convenient area for viewing This feature is particularly useful in tight spaces with poor visibility, or when it isn t convenient to read the display at the same time you re taking a measurement on a circuit or piece of electrical equipment
Construction and Convenience Features
Most DMMs have a shock-resistant heavy-duty case with a belt holster, and a tilt stand for placing on flat surfaces such as a table Many also have handles that allow them to be hung at eye level, an advantage in many troubleshooting applications where space is tight DMMs are very rugged and can last for years of trouble-free operation under heavy-duty use 27
Many units can operate with the same 9 V battery for 2000 to 3000 hours because the solid-state circuits and LCD display have a very low current drain Some models constantly display a battery status icon on the screen In other models, a Lo Bat warning appears or the decimal point in the digital display blinks when the battery is nearing its end of life
Function Selection
DMMs have a dial or rotary switch that lets you select basic measurement functions (such as voltage, current, resistance, frequency, and temperature) Higher-priced DMMs also have either four or eight soft keys These are push buttons whose function depends upon the type of measurement selected When the dial is rotated to select a basic measurement function, such as current, some or all of these soft keys may become active When this happens, the purpose of that key is displayed at the bottom of the LCD display (ie, just above the soft keys) For some measurement functions, not all soft keys will be active
Inputs and Test Leads
Most DMMs have three test jacks or inputs: voltage (V), current (A), and common or return (COM) The inputs marked V and A are normally colored red, as are the various test leads that plug into them The common input, which is used for all measurement functions, is normally colored black, as is the common test lead that plugs into it 28
NOTE: Some units also have a fourth separate input for current measurements in the milliampere (mA) or microampere ( A) range
Accessories
DMM manufacturers offer a wide array of accessories that both extend measurement ranges and allow the instrument to be used for additional types of measurements, including:
Power Power factor Energy (kWh) Harmonics Temperature (single probe, and dual probe for differential) Light intensity Relative humidity Carbon monoxide (CO) Airflow
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