Multimeter
Multimeter - Related Videos
11:34
Series and Parallel Resistors
0 Views •
2023
Source: Yong P. Chen, PhD, Department of Physics & Astronomy, College of Science, Purdue University, West Lafayette, IN This experiment demonstrates how current is distributed in resistors connected in series or parallel, and thus describes how to calculate the total "effective" resistance. Using Ohm's law, it possible to convert between the voltage and current through a resistance, if the resistance is known. For two resistors connected in series, (meaning that they are wired one after the...
14:20
Galvanic Cells - Student Protocol
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2020
Source: Smaa Koraym at Johns Hopkins University, MD, USA Constructing a Lead-Copper Galvanic CellExpand In this experiment, you will construct a lead-copper galvanic cell and then measure the voltage that is generated during the redox reactions occurring at the anode and cathode. To begin, put on the necessary personal protective equipment, including a lab coat, gloves, and chemical splash goggles. Prepare 100 mL of a 0.05 M copper sulfate solution. First, calculate the amount...
09:03
Giant Liposome Preparation for Imaging and Patch-Clamp Electrophysiology
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Cited by 23 •
2013
Reconstituting functional membrane proteins into giant liposomes of defined composition is a powerful approach when combined with patch-clamp electrophysiology. However, conventional giant liposome production may be incompatible with protein stability. We describe protocols for producing giant liposomes from pure lipids or small liposomes containing ion channels.
06:05
Additive Manufacturing-Enabled Low-Cost Particle Detector
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Cited by 1 •
2023
Here, we present a protocol on how to build and test a simple but efficient low-cost particle detector.
06:01
An Electroporation Cytometry Protocol for Live-Cell, Fluorescence Microscopy Using U2 OS Cell Culture
0 Views •
2025
Electroporation is the use of pulsed electric fields (PEFs) to create transient pores in cell cultures to introduce molecular cargo. This technique has recently become widely used in research and clinical settings. Here, we describe electroporation techniques using the recently developed "Electroporation Cytometry System" for performing live-cell, fluorescence microscopy.
FAQs
Voltage measurements compare electrical conditions across two points, so the selected measurement circuit is placed across the component or circuit section being examined. This connection allows the instrument to sense the relevant electrical signal and present a numerical or scale-based result. Connecting at the wrong points can produce a reading that does not represent the condition under investigation.
Current measurement requires the circuit’s electrical flow to pass through the selected measurement circuit. Placing the instrument in series makes its sensing path part of that flow, allowing the multimeter to detect the current in the chosen circuit section. This differs from voltage measurement, which uses a connection across two points to compare electrical conditions.
Range selection determines how the instrument measures and presents the sensed electrical signal, so the chosen setting must match the quantity being examined and its expected magnitude. Polarity establishes the relationship between the instrument leads and the circuit points. Incorrect range or reversed polarity can make readings unsuitable for interpretation, even when the circuit connection is otherwise appropriate.
Digital multimeters convert sensed electrical signals into numerical readings shown on a display, while analog multimeters indicate values through deflection along a scale. Both approaches communicate the measured circuit condition, but the form of presentation differs. Engineers can therefore interpret results according to the instrument type while checking voltage, current, resistance, or other supported functions.
First identify the electrical quantity and circuit section to examine, then select the corresponding measurement function and an appropriate range. Connect the instrument using the required across or series arrangement, while observing polarity, and read the displayed value or scale deflection. This sequence supports meaningful results and safer operation during design, installation, testing, and maintenance.
Engineers can use measurements of voltage, resistance, and continuity to compare the observed condition of wiring or circuit sections with the expected circuit behavior. Differences in these readings can help identify a wiring problem or a section requiring further examination. The instrument is therefore useful during troubleshooting, particularly when verifying connections and checking whether circuit paths behave as intended.
During circuit design, installation, or maintenance, engineers can use the instrument to test components and confirm power supply conditions. Voltage readings help examine electrical conditions at selected points, while resistance or continuity checks provide additional information about component or connection behavior. These measurements support verification before a circuit is accepted, serviced, or investigated for abnormal operation.
Readings provide direct evidence about circuit behavior at the points or components being examined. Depending on the selected function, they can indicate voltage, current, resistance, or continuity, helping engineers verify operation and investigate faults. Used with correct range selection, polarity, and connection, these results support decisions during routine maintenance as well as targeted electrical troubleshooting.