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How Do You Measure IV?

Published in IV Measurement 2 mins read

The method for measuring "IV" depends on the context. "IV" can refer to intravenous fluids or to current-voltage (I-V) curves in electronics.

Measuring Intravenous (IV) Fluid Levels

To measure the level of fluid in an IV bag, observe the markings on the bag itself. Most manufacturers use incremental markings:

  • Liter Bags: Long markings typically represent 100cc increments, while shorter marks often indicate 50cc increments. [Source: allnurses.com]

Measuring Current-Voltage (I-V) Curves

Measuring I-V curves involves determining the relationship between the voltage applied to a device and the resulting current. This is done by:

  1. Applying a series of voltages to the device. A voltage source systematically changes the voltage.
  2. Measuring the current at each voltage. An ammeter, placed in series with the device, measures the current.
  3. Measuring the voltage. A voltmeter, connected in parallel to the device, measures the applied voltage.
  4. Plotting the data. The measured voltage and current values are plotted on a graph to create the I-V curve. This curve illustrates the device's behavior. [Source: ossila.com, Sciencetech Inc.]

Different tools are used for this process, including:

  • Source-Measure Units (SMUs): Instruments like the Keithley 2400 or 6517B are commonly employed for precise I-V measurements. These instruments can automatically sweep the voltage and measure the current. [Source: ResearchGate, NI Community]
  • LabVIEW: Software like LabVIEW can be used to control the voltage and acquire the current readings, automating the I-V curve measurement process. [Source: NI Community]

Pulsed IV Measurements: For certain materials like semiconductors, pulsed IV measurements are used. This involves applying short voltage pulses to reduce heating effects during measurement. [Source: Tektronix]

Calculating IV percentages, as seen in the context of Pokémon game statistics, involves a different methodology altogether: summing the individual IV values, dividing by the total possible IV points, and multiplying by 100%. [Source: r/TheSilphRoad]

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