![]() ![]() ![]() For DC current readings as with the DC voltage reading a negative sign will appear if the current is negative. To read currents greater than 300 mA, or if the current is not know place the red lead in the port labeled 10A (see Figure 1). To take a reading that is know to be less than 300 mA place the red lead in the port labeled 300 mA (see Figure 1). To read current the red lead must be moved to one of the two ports for current. The units for current are amps (A) or milliamps (mA). To read either AC or DC current the correct function must be selected on the function selection dial (See Figure 2). The Fluke meter can read either AC or DC current up to 10 amps. If however the red lead is on the negative side of the source a negative sign will appear on the display indicating that the polarity of the voltage is opposite from the way the leads are connected. If the red lead is on the positive side of the voltage source the meter will read positive voltage. The polarity of DC voltage can also be determined. The AC voltage function reads the RMS (root mean square) voltage of an AC circuit. Measuring a voltage which is known to be less than 300 mV the meter should be set on the 300 mV setting (see Figure 2). AC voltage and DC voltage are separate functions on the meter each with its own setting on the selection dial as shown on Figure 2. The units for voltage are volts (V), or milivolts (mV). The voltage of either alternating current or direct current can be measured. Measuring Voltageįor all voltage measurements the red lead must be placed in the voltage port which is red on the meter (See Figure 1). The units for a measurement are always given in the upper right hand corner of the display screen (see Figure 1).įigure 2: Function Selection on the Fluke MultiMeter. The red lead is placed in one of the other three ports depending on which function of the meter is being used. The black (common) lead is always placed in the port labeled COM (see Figure 1). For the readings to be meaningful the accuracy of the meter must be kept in mind. These values are presented in maximum percent error possible for certain temperature ranges. The literature for the multi meter lists the accuracy of the meter for the functions of the meter. ![]() The meter is fuse protected to prevent damage to the device if the incorrect function is selected or if the leads are placed in the incorrect port for the measurement being taken. To take a reading the leads must be moved to the appropriate port for the desired measurement. This means that the approximate magnitude of the signal does not have to be known or determined to take an accurate reading. On the Fluke meter the correct range is automatically selected for most measurements. On many multi meters each function also has multiple ranges for taking measurements of varying magnitudes. The multi meter has a multi position selector to select the desired function (See Figure 2). The functions on the fuse protected Fluke 73 multi meter are DC voltage, AC voltage, AC or DC current, resistance, audible continuity test and diode test. When using a multi meter and interpreting the results gained it is often useful to have a working understanding of Ohm's law. Diagnosing the ignition system on your car when it does not start after you have spent the day in the field in a remote location.Reading the voltage signal from pyranometer.Verifying power supply to a piece of equipment which is not functioning.Measuring the current draw of small AC or DC equipment.The meter could be used for all of the following, and much more. The specific applications of this device are numerous. A portable hand held multi meter can be used anywhere that quick accurate readings of voltage, current, or resistance are required. The meters feature an automatic hold to store a reading, and an audible continuity beeper, and can test diodes. These meters are over voltage protected against transient voltage spikes andĬonform to International Electrotechnical Commission's safety standard IEC 61010. The Engineering department at Humboldt has a set of Type 73 -III Series III hand held digital multi meter manufactured by Fluke. Fluke Type 73 Digital MultiMeter IntroductionĪ multi meter is small portable device that can be used to measure voltage, current resistance, or to test diodes. ![]()
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