Modern multimeters are often digital due to their accuracy, durability and extra features. In a digital multimeter (DVOM), the signal under test is converted to a voltage and an amplifier with electronically controlled gain preconditions the signal. Thie multi meter displays the quantity measured as a number, which eliminates parallax errors.
The digital multimeter may have an embedded computer, which provides a wealth of convenience features. The measurement enhancements available for this electric test equipment include:
- Auto-ranging: it selects the correct range for the quantity under test so that the mostsignificant digits are shown.
- 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.
- A graphic representation of the quantity under test, as a bar graph.
- A low-bandwidth oscilloscope.
- Automotive circuit testers, including tests for automotive timing and dwell signals.
- Simple data acquisition features to record maximum and minimum readings over a given period, or to take a number of samples at fixed intervals.
- Integration with tweezers for surface-mount technology.
- A combined LCR meter for small-size SMD and through-hole components.