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What happen if you interchange the current and voltage probes of four probe?
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What is input impedance of cro probe?
There are 2 types of CRO probes a. Active Probes (9 Megaohms) b. Passive Probes - hig voltage probe (10 to 1000 Megaohms)
If you make a mistake in polarity when meauring the value of dc voltage in a circuit with a digital vom what will happen?
absolutely nothing happens...just reverse the probes of multimeter & measure it again...this time around it should come positive...
How you can do Calibration of voltmeter by potentiometer?
A: The only calibration that a potentiometer is allow to do is on the resistance scale. The reason being is the internal battery looses capability with age so to compensate the pot. will change current available to make the ohmmeter to go to zero when the probes are shorted. To test a volts range then an accurate voltage must be used to verify calibration.
Why is it that when a tester is put on the neutral wire in a single phase system it doesnt indicate current flow?
The only time that there will be zero current flow on the neutral is when the panel is completely balanced on both legs. When you state that the "tester is put on the neutral wire" suggest that the wrong kind of meter or meter scale is being used to test for current. The amperage testing of conductors is done by inserting a meter in series with the conductor or a meter has to be clamped over the wire to measure its magnetic flux of the current going through the wire. If you have mistakenly used a voltage meter to do the test, you will have a zero potential because the neutral and ground wire are bonded together and will have no reading between each other. The same will occur if you are trying to use probes and read off of the amps scale. The probes have to be in series with the circuit to get a reading.
Can you use an oscilloscope to measure the 110 volts AC in a home wall outlet if so how is it done safely to avoid damage to the oscilloscope?
The first thing to consider in measuring the line voltage of a home wall outlet is the oscilloscope probe voltage rating. Most high-impedance probes have a resistance of one Megohm of greater and will withstand peak voltages in excess of 200 Volts, but it pays to make sure that you do not damage the resistor within the probe. The next item of concern is the current flowing in the power line ground. If you have a ground current protected outlet, then it will be safe from dangerous ground currents. It will also limit the voltage errors produced by any circulating ground currents. As is the case for many instruments, the metal case is generally tied to the line common through a small capacitor, so the ground current can produce a small voltage between the case and line common. That is the purpose of using a line current interrupter for protection. Do NOT connect the oscilloscope ground lead to the line socket. If you connect it to the wrong pin, then the case can be at a high enough voltage to cause shock. Better to be on the safe side. Keep in mind that the voltage is rating in RMS (root-mean-square) volts and not peak or average volts. Therefore, the sine wave peak is 1.414 (square root of 2) times the RMS voltage. Conversely, the RMS voltage the peak voltage divided by 1.414.
What do you mean by Polarity for the following Electrical parameters Charge Voltage Current Meter probes?
Charge, + charge is a lack of electrons, - is an excess of electrons, compared to a reference point. Voltage, + voltage is measured at a point that has a lack of electrons, compared to a reference point. Current, + current flowing through a wire indicates that electrons are flowing in the opposite direction Meter probes, see voltage above.
How do you tell polarity?
what do ya mean by "Polarity" for the following parameters? Charge: Voltage: Current: Meter Probes:
When measuring voltage the probes should be connected in?
can some one please tell me when measuring voltage the probes should be connected to sequence or series?
When measuring voltage do the probes need to be in series or parallel to the load?
Parralel
What is input impedance of cro probe?
There are 2 types of CRO probes a. Active Probes (9 Megaohms) b. Passive Probes - hig voltage probe (10 to 1000 Megaohms)
Why use the -tive voltage in vibration probes instead of plus tive voltage in Bentley Nevada system?
potential difference
Which energy meter is required for calculating DC?
Most volt/amp meters have a DC mode. You measure DC voltage by putting the two probes across the voltage source. You measure current by either putting the meter in series with the load or using a clamp on amp meter that measures current flow through induction.
When measuring voltage how should test probes be connected?
First connect the positive terminal of the voltage line to positive terminal of multimeter and negative to negative terminal of multimeter. Select voltage in multimeter and measure the voltage
If you make a mistake in polarity when meauring the value of dc voltage in a circuit with a digital vom what will happen?
absolutely nothing happens...just reverse the probes of multimeter & measure it again...this time around it should come positive...
What is the advantage of four probe method over other conventional methods?
I assume you are referring to methods of measuring small value resistances, as in locating short circuits on a PC card. Two probe is the method used by standard ohm meters. This works OK for most resistance values, as the resistance of the leads & probes is much lower than the resistance being measured. But when the resistance being measured gets very tiny (e.g. a few milliohms) it fails as the resistance of the leads & probe are of the same order of magnitude and are in series with it. Four probe solves this problem by using two probes connected to a current source to drive the resistance and a separate two probes connected to a precision voltmeter calibrated in milliohms. The voltage drop in the leads due to the test current does not get measured by the calibrated voltmeter, as it does in two probe method. There is no voltage drop in the measurement leads as the voltmeter is high impedance.
How do you make circuit in multimeter to measure current?
Use a shunt made a precision but very low resistance. Place the shunt in series with the ckt. Measure the voltage drop, and do the math. The ammeter function of most voltmeters uses two ranges- about .25ohms for the 10 amp range, and a higher value for lower currents on the order of 250ma where a larger shunt won't affect the ckt too much and give a more accurate reading. Many meters are damaged when this function is used on low range first with 10 amps applied!
How many space probes heve been to Mercury?
2 probes. Mariner 10 orbiter in the 1970s and the current MESSENGER spacecraft which will orbit and map the entire surface.
