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Digital Panel Meters

Home Measuring & Control Instruments Digital Panel Meters

A digital multimeter is a device which provides combined functionality of ammeter, voltmeter and ohmmeter. It is commonly known as DMM. It is most widely used due to its small size, price and ease in operation. A digital multimeter has an analog/digital converter that provides a digital readout. This increases the precision in reading the values.

Category: Measuring & Control Instruments
  • Description

Description

Modern multimeters are often digital due to their accuracy, durability and extra features. In a digital multimeter the signal under test is converted to a voltage and an amplifier with electronically controlled gain preconditions the signal. A digital multimeter displays the quantity measured as a number, which eliminates parallax errors.

Modern digital multimeters may have an embedded computer, which provides a wealth of convenience features. Measurement enhancements available include:

Auto-ranging, which selects the correct range for the quantity under test so that the most significant digits are shown. For example, a four-digit multimeter would automatically select an appropriate range to display 1.234 instead of 0.012, or overloading. Auto-ranging meters usually include a facility to hold the meter to a particular range, because a measurement that causes frequent range changes can be distracting to the user.
Auto-polarity for direct-current readings, shows if the applied voltage is positive (agrees with meter lead labels) or negative (opposite polarity to meter leads).
Sample and hold, which will latch the most recent reading for examination after the instrument is removed from the circuit under test.
Current-limited tests for voltage drop across semiconductor junctions. While not a replacement for a transistor tester, this facilitates testing diodes and a variety of transistor types.[12][13] A graphic representation of the quantity under test, as a bar graph. This makes go/no-go testing easy, and also allows spotting of fast-moving trends.
A low-bandwidth oscilloscope.[14] Automotive circuit testers, including tests for automotive timing and dwell signals.[15][better source needed] Simple data acquisition features to record maximum and minimum readings over a given period, or to take a number of samples at fixed intervals.[16] Integration with tweezers for surface-mount technology.[17][better source needed] A combined LCR meter for small-size SMD and through-hole components.

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