(i) Direct Key function:
(ii) Menu function:
Following Direct key multimeter functions are:
(a) Data Hold: It captures the display reading when pressed. Press the data hold button before removing the test leads from its port.Be sure to allow time for the reading to stabilize before pressing this button to capture the measurement.
(b) Auto Hold: Press the auto hold button and connect the test leads to the measurement circuit. After the reading stabilizes, the multimeter gives an audible signal to notify the user that the measurement has been captured.Auto hold waits to capture the reading until after it stabilizes.
(c) Max Hold: It displays the highest value that the meter has seen during the measurement.
(d) Min/Max/Avg: This button captures the lowest, highest and average value that the meter has seen during the duration of the measurement.With its dual display,digital multimeter will show the instantaneous measurement on the main display and shows the min/max/Avg value on its secondary display.
(f) Peak hold: It is used to measure current caused by a motor start up.
(g) Peak Min/Max: It captures the highest and lowest points on the sine wave. When new minimum and maximum values are measured the multimeter will capture new readings and notify the user with the audible beep.
How to read a digital multimeter?
1. Reading the dial settings:
2. Reading Digital multimeter result:
Digital multimeter Specifications
1. Performance parameter: It is convenient to think performance in terms of the functional and characteristic parameter. Functional parameters like amplitude range, frequency range, measuring voltage, current, resistance describes the basic capability and functionality of digital multimeter while characteristic parameter such as noise, crest factor, stability with temperature etc describes the accuracy characteristic of digital multimeter.
3. True rms : It is the important element of any digital multimeter is whether it is able to measure true rms values or not.True RMS measurements provide a measure of the actual heating effect of the waveform.The reading will consist of Ac components as well as dc components. Those multimeters that do not provide rms measurements, measure the average of the absolute value of AC voltage and are calibrated so that the readings are corrected to that of the RMS value for a sine wave. This normally works well, but errors occur if any harmonics are present.
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