# shunt type ohmmeter derivation

The range of the ohm-meter can he increased by providing required shunts, to cover the required resistance range. With the series resistance R, in series with the ammeter, when the test terminals are short circuited, the meter will indicate full scale deflection. However, when the terminals or leads are shorted, Rx =0 R x = 0 and maximum current flows. The maximum (F.S.D) current indicates the zero resistance.

between the Meter resistance and the resistance of R, depending on the ratio of
This point on the scale can be marked as infinite for resistance. ohms for the resistance shunting (paralleling) the Meter.

What are the important CPU registers in the 8085 microprocessor? When the ohmmeter is connected in the shunt position, the indicating needle deflects from right to left in the manner of the ammeter and voltmeter.

When the battery voltage falls below 1.35 V it is to be replaced. (d) Shunt Type or Forward Reading Ohm -meter: The shunt type of consists or a battery a series resistance connected to a basic meter. Many of the portable multimeters employ this type of ohm-meter circuit.

There are two types of ohm-meters. A modification of this method gave the ohm-meter of the direct reading type. Multi-Range Ohmmeter. These ohm-meters will be designed for a given mid-scale reading. Therefore this type of ohm-meter is useful in measuring low to medium values of resistances to satisfactory accuracy. from about 30 to 10,000 ohms. The series type ohm-meter indicates the value of its internal resistance on its mid-scale. So, we can measure the value of unknown resistance by placing it to the right side of … Shunt Type Ohmmeter In this type of meters, we have a battery source and an adjustable resistor is connected in series with the source. The second method is to include a shunt resistance across the ammeter and to adjust the value of the shunt to obtain full scale deflection. Therefore . In both the cases the mid-scale reading is indicated. If the terminals of the ohmmeter are left open, Rx = ∞ R x = ∞ and no current flows. Shunt Ohmmeter. Ohmmeter operation is as follows: 1. the internal resistance of the ammeter be R, the internal resistance of the ammeter be 2000. the battery voltage be 1.5 V on full charge. The scale is non-uniform. The resistance R in a circuit is given by the ratio of the voltage across the circuit and the current drawn by the circuit. We have connected the meter in parallel to the resistance which is to be measured. This method is better than adjusting the series resistance value, as it does not bring large change in calibration. Also make sure no parallel resistances are present (including your hands). He was born on September 1, 1950 in Kerala, India. Hence the zero point on the scale of the ammeter can he marked as infinite for resistance scale. In my experience, when I ask what is electronics there is a tendency for many ones... 8085 Microprocessor Lab Viva Questions With Answers 1. ohmmeters are used mainly to measure low values of resistance. In order to approximately know the value of resistance of components etc., a direct reading instrument is necessary. The meter has adjuster which selects the range according to need. In TTL circuits also, input transistor T 1 is a multi-emitter transistor driving the phase-splitter transistor T 2 . The value of the variable resistance and fixed value can be determined as follows. Here we are going to discuss about what is electronics. The resistance indicated by this meter will be accurate only when the reference voltage of the cell or battery used is constant throughout. The maximum value of resistance that can be measured with this ohm-meter is fixed as a percent of the full scale deflection. Usually this maximum value of resistance is marked at 1% of the full scale deflection current.

When the test terminals are open circuited that is, there is infinite resistance between the test terminals the ammeter reads zero current. With the new battery the 4.7 k, variable resistor will be adjusted to offer only 3 k. such that the ammeter gives full scale reading.

650 ohms. In this arrangement it can be clearly seen that the calibration of the ohm-meter's scale changes with the adjustment of the zero adjuster. (a) Backward Reading or Series Type of Ohm-meter: The arrangement for measuring resistance with the series type of ohm-meter is explained below. The most obvious way to tell the difference between the series and shunt ohmmeters is by the scale of the meter. Observation of the scales will show that the series type of ohm-meter is useful for medium values of resistances. Hence. ... Optical Communication Lab - Viva Questions With Answers 1. Hence a volt-meter and ammeter can be used to measure the value of resistance in a circuit. The value is. The shunt current through R 2 is given by I 2 =I t-I fsd. There is a switch by the use of which we can on or off the circuit. Zero resistance is on the left. This circuit works by supplying a constant current to the Meter from the
This gives error of 10% showing a mid-scale reading of 30 kn when the battery is new, and 27 k. when the battery discharges to 10% of its value.

Hence, R 1 and R2 can be determined.

The basic circuit diagram of a Shunt type Ohmmeter is shown below. The main thing to always
If the resistor’s value is unknown and to be measured by placing it in parallel (shunt) with the ohmmeter, then that ohmmeter is called shunt ohmmeter. 2.

For all other values of resistance connected between the test terminals the ammeter will indicate a reading which obeys Ohm's law. When the test terminals are short circuited i.e., when there is no external resistance; the value of series resistor will be. Schematic diagram of a shunt ohmmeter. As the battery looses voltage the variable resistance can be adjusted to further and further lower values of resistance to give full scale deflection. You can use this Meter to measure about anything in the kit (except
(d) Shunt Type or Forward Reading Ohm -meter: The shunt type of consists or a battery a series resistance connected to a basic meter.

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