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Assuming you mean the reflected voltage in a transmission line (such as coaxial cable) where the cable, source and load must all have the same impedance for maximum power transfer to the load. If the impedances are not matched, some power is reflected from the load back to the source.
In simple cases, this wastes power, in serious cases the source (a radio/radar transmitter) will suffer serious damage or just plain blow up (!)
You need either a reflectometer or a standing-wave ratio meter (SWR meter).
The SWR meter is simplest. You just connect it "in line" between the source and load.
You switch the meter to measure the forward (to the load) voltage, then switch to measure the reverse (from the load) voltage.
An ideal SWR reading is 1:1, showing perfect matching.
This doesn't mean the two voltages (forward and reverse) are equal (that would imply the power is all being returned!).
A 1:1 ratio shows that there are no peaks or nodes(collisions between forward and reverse voltages) and that the voltage distribution along the line is "flat". This shows perfect matching.
For a more complete description, check out any of the Amateur Radio websites online - hams spend a lot of time getting transmitters, feedlines and antennas matched up.
What else can I help you with?
What is used to measure voltage?
a voltmeter is used to measure voltage
What value of voltage measure by DMM Vrms or Dc voltage?
Many can measure both - Vrms (AC) or DC voltage.
Who measure of charge differential voltage?
Any one using a voltage test instrument can measure charge differential voltage.
The unit of measure of voltage is the ohm?
The unit of measure for voltage is volt. Ohm measures resistance.
How can you measure the power or voltage of a potato clock?
A voltmeter would measure the voltage. If you measure the voltage drop over a known low resistance you get a kinda-sorta idea of the power available.
How do you measure the voltage by looking at a breaker box in a home?
You don't. You need test equipment to measure voltage.
What does a voltmeter measure voltage in?
A voltmeter measures voltage in volts.
How can I measure voltage accurately in an electrical circuit?
To measure voltage accurately in an electrical circuit, use a digital multimeter set to the voltage range of the circuit. Connect the multimeter's probes across the component or points where you want to measure the voltage. Read the displayed voltage value on the multimeter's screen for an accurate measurement.
How do you measure voltage using a ammeter?
An ammeter measures amperage not voltage.
What is the measure of the voltage decrease along a wire?
Decrease or reduction of voltage along the wire is called voltage drop. It is measure through wire and load resistance difference.
What is used to measure potential difference inparallel circuits?
A voltage test meter is used to measure voltage potentials in a circuit.
What unit of measure is used to measure voltage?
The SI unit of voltage is the Volt, which is a derived unit equivalent to a Joule/Coulomb.
