Yes. It NEEDS a source to be connected.
Turn off the supply before using the ohmmeter,it will damaged your ohmmeter when supply is present.
Basically, your series and shunt ohmmeters differ in circuit configuration. Your series ohmmeter is configured in a way that your "meter" (which has internal resistance) is connected in series to your "measured resistor" and we all know that those TWO resistances will ADD up causing some sort of inaccuracy. While on the other hand, your shunt ohmmeter is configured in a way wherein your "meter" is connected in PARALLEL to your "measured resistor" that will ease-up the inaccuracy but will only measure resistances ranging from 200 Ohms to 400 Ohms (typically and depending on your configuration).
Because ordinary ohmmeters are calibrated to measure a range of resistance values that are significantly lower than the resistance of insulation. It should also be realised that we usually test insulation resistance while subjecting the insulation to a high electric field, which a normal ohmmeter is incapable of producing.
Impedance is the total opposition to current flow. It includes both resistance AND reactance (capacitive and inductive). Impedance varies with frequency, while plain resistance does not. Scroll down to related links and look at: "Different names for the two impedances Z1 and Z2" "Calculation the damping of impedance bridging or power matching an interface connecting Zout and Zin" "Impedance bridging or voltage bridging of two audio units".
Connected environment is one in which a user is required to be constantlyconnected to the Data Source while performing any operation in-order to keep the data up-to-date, whereas in Disconnected environment no constant connection to the Data Source is required.Moreover in connected environment the data concurrency effects can beeasily resolved but Connected environment causes network traffic. But in Disconnected environment since the user is not directly connected to the data source, the user can connect to the data source as and when required and hence it allows for Multiple applications to simultaneously interact with the Data Source. It also improves the scalability and performance of the applications.Few more differences can be contributed as the Connected Environment uses Datareader while the Disconnected one uses Dataset. This results in the fact that Connected Environment is Slower in speed in comparison to Disconnected environment for DML Operations. But as far the Connected Environment is concerned we get updated data and less chances of Dirty read, whereas Disconnected environment suffers from the major problem of Dirty read.Thanks & Regards,Shoaib R Khan - SRK
Turn off the supply before using the ohmmeter,it will damaged your ohmmeter when supply is present.
Basically, your series and shunt ohmmeters differ in circuit configuration. Your series ohmmeter is configured in a way that your "meter" (which has internal resistance) is connected in series to your "measured resistor" and we all know that those TWO resistances will ADD up causing some sort of inaccuracy. While on the other hand, your shunt ohmmeter is configured in a way wherein your "meter" is connected in PARALLEL to your "measured resistor" that will ease-up the inaccuracy but will only measure resistances ranging from 200 Ohms to 400 Ohms (typically and depending on your configuration).
Be certain the circuit is de-energized and discharged before connecting an ohmmeter.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.
If an external Voltage is applied to a multimeter while the multimeter`s function switch is in the Ohm meter position then the Ohmmeter is apt to be destroyed or disabled. Therefore the simplest answer is that the power must be turned off in order to avoid damage to the Ohm meter and possibly to yourself caused by Voltages present in the circuit while the power is own. Another reason of course is because a valid Ohm reading can not be obtained while Voltages are present across the resistance that is being measured because the Ohmmeter itself applies a Voltage across the resistance and then a sampling of the current through the unknown resistance is used by the Ohmmeter`s circuitry to cause a calibrated deflection of the Ohmmeter and thus display on the meter`s dial the Ohmic value of the unknown resistance. For the same reasons as above it is also a good practice to discharge all the capacitors in the circuit after the power is turned off and before any in circuit resistance measurements are made.
You open one of the leads of resistor connected in electronic circuit while measuring its resistance in order to not introduce error cause by other components in the circuit.
Because ordinary ohmmeters are calibrated to measure a range of resistance values that are significantly lower than the resistance of insulation. It should also be realised that we usually test insulation resistance while subjecting the insulation to a high electric field, which a normal ohmmeter is incapable of producing.
Never connect the ohmmeter's leads across a voltage.On an analog meter, adjust the zero before use.Turn your ohmmeter off when not in use, to protect against voltage drain.When your ohmmeter's battery is low, or your meter won't be used for a while, remove the battery to prevent damage to the meter from battery leakage.
The thermistors are resistors whose resistance changes with the temperature. While for most of the metals the resistance increases with temperature, the thermistors respond negatively to the temperature and their resistance decreases with the increase in temperature. Since the resistance of thermistors is dependent on the temperature, they can be connected in the electrical circuit to measure the temperature of the body.
parallel means they will never cross each other. take a example when a resistance connected in parallel then a current flowing through it(both resistance) is not same depended on the value of each resistance. while in the series circuit current values is same for both resistance. parallel lines are drawn below:- series lines:- -------
Configuration Voltage Gain Current Gain Input Resistance Output Resistance Common- Source AV >1 - ∞ Moderate to high Source-Follower AV ≈ 1 - ∞ Low Common- Gate AV > 1 Ai ≈ 1 Low Moderate to high Both the common-gate and common source has voltage gain of greater that 1 compared with the voltage gain of source- follower which is less than or approximately equal to 1 . The input resistance of both common-source and source follower is high typically ranges from kilo ohms and above while common-gate has a low input impedance ranges from hundred ohms or below. The output resistance of both common-gate and common-source are dominated by RD while source follower has low output impedance and is not dominated by RD
the ants getting resistance to DDT while the humans not getting resistance to tobacco? the ants getting resistance to DDT while the humans not getting resistance to tobacco- why
Impedance is the total opposition to current flow. It includes both resistance AND reactance (capacitive and inductive). Impedance varies with frequency, while plain resistance does not. Scroll down to related links and look at: "Different names for the two impedances Z1 and Z2" "Calculation the damping of impedance bridging or power matching an interface connecting Zout and Zin" "Impedance bridging or voltage bridging of two audio units".