The following is a list of the MINIMUM safety precautions for using a voltmeter.
Always connect voltmeters in parallel.
Always start with the highest range of a voltmeter. Deenergize and discharge the circuit completely before connecting or disconnecting the voltmeter.
What are the precautions observed while using voltmeter?
PRECAUTIONS WHEN USING A VOLTMETER & AMMETERS
Observe
the correct polarity. Wrong polarity
causes the meter to deflect against the mechanical stop and this may damage the pointer. Place the voltmeter across the circuit or component whose voltage is to be measured.
What are the safety precautions before you measure the voltage?
Always start with the highest range of an ammeter.
Deenergize and discharge the circuit completely before you connect or disconnect the
ammeter. In dc ammeters, observe the proper circuit polarity to prevent the meter from being damaged. Never use a dc ammeter to measure ac.
What precaution must be taken when measuring resistance?
Do not apply power to a circuit while measuring resistance
. When you are finished using an ohmmeter, switch it to the ofF position if one is provided and remove the leads from the meter. Always adjust the ohmmeter for 0 (or ∞ in shunt ohmmeter) after you change ranges before making the resistance measurement.
What is the rule in measuring voltage?
To measure voltage on an electronic circuit, you don’t have to insert the meter into the circuit. Instead,
all you have to do is touch the leads of the multimeter to any two points in the circuit
. When you do, the multimeter displays the voltage that exists between those two points.
What can damage a multimeter?
Overpowering the digital multimeter can
damage the components inside the meter
. For example, Figure 2 shows that the maximum voltage input of a 34461A digital multimeter is 1000VDC and 700 VAC. Before turning on or off the connected equipment or the DUT, reduce the signal level to the minimum safety level.
What is sensitivity and accuracy of meters?
Every meter coil has a certain amount of dc resistance. The sensitivity of a meter movement is
the maximum current that the movement can measure
. … Any current greater than this value will very likely damage the meter.
What is the difference between AC and dc potentiometer?
But there is one major difference between their measurements,
DC potentiometer only measures the magnitude of the unknown voltage
. Whereas an AC potentiometer measures both the magnitude and phase of unknown voltage by comparing it with a known reference.
What are two important things to remember about the voltmeter?
The most important thing to remember is that
the voltmeter should be connected in parallel with the light bulb
. That means you can always connect the voltmeter last. You do not have to disconnect any circuit elements in order to properly add a voltmeter to a circuit.
What is volt meter?
Voltmeter
, instrument that measures voltages of either direct or alternating electric current on a scale usually graduated in volts, millivolts (0.001 volt), or kilovolts (1,000 volts). Many voltmeters are digital, giving readings as numerical displays.
What are the three general precautions to take when measuring resistance?
- Do not drop any meter.
- Do not overload any meter. …
- Do not tamper with precision instruments. …
- Before you connect a meter to a circuit, ensure that the range switch is set to an appropriate position.
- Carefully check circuit connections before applying power to meters.
What do we use to measure resistance?
Resistance is measured using an instrument such
as an analog multimeter or digital multimeter
. … As a result, a circuit’s resistance value can be determined if the current and voltage measured values are known. Analog multimeters and digital multimeters employ the measurement principle of Ohm’s Law to measure resistance.
What is a safety precaution?
safety precaution in British English
(ˈseɪftɪ prɪˈkɔːʃən) noun.
a precaution that is taken in order to ensure that something is safe and not dangerous
.
Why do we measure voltage?
Voltage Measurement Overview
Voltage is the difference of electrical potential between two points of an electrical or electronic circuit, expressed in volts.It
measures the potential energy of an electric field to cause an electric current in an electrical conductor
. Most measurement devices can measure voltage.
How is load voltage measured?
Calculating an Electrical Load in a Simple Circuit
Let Power = Voltage * Current (P=VI)
. Let Current = Voltage/Resistance (I=V/R). Apply Kirchoff’s Second Law, that the sum of the voltages around a circuit is zero. Conclude that the load voltage around the simple circuit must be 9 volts.
