# Balanced Method

## balanced method

[′bal·ənst ¦meth·əd]
(engineering)
Method of measurement in which the reading is taken at zero; it may be a visual or audible reading, and in the latter case the null is the no-sound setting.

## Balanced Method

a measurement method based on compensation (balancing) of the voltage or electromotive force (emf) being measured by a voltage or emf produced across a known resistance by a current from an auxiliary source. The balanced method is used in measurements not only of electrical values (such as emf, voltage, current, or resistance) but also of other physical quantities (mechanical, light, and temperature), which are usually converted to electrical quantities before making measurements.

The balanced method is a version of the method of comparison with a standard. In this method the effect of the action of the quantities on the instrument is set to zero (an attempt is made to obtain a zero reading of the measuring instrument). The balanced method is distinguished by high accuracy; the accuracy depends on the sensitivity of the null instrument (null indicator), which controls the compensation, and on the precision of determination of the quantity necessary to compensate the quantity being measured.

The balanced method in a DC circuit functions as follows. The voltage Ux being measured (see Figure 1) is compensated by a voltage drop produced across a known resistor r by the current from an auxiliary source Uaux (the operating current Iop). The galvanometer G (the null instrument) is connected to the circuit of the voltages being compared by throwing a switch S to the right-hand position. When the voltages are compensated, no current flows through the galvanometer, and hence no current flow occurs in the circuit of the voltage Ux being measured. This is an important advantage of the balanced method as compared to other methods, since it is possible to measure the total emf value of the source Ux; in addition, the results of measurements made by the method are not affected by the resistance of connecting wires and the galvanometer. The operating current is established by means of a standard cell EN of known emf, compensating this emf by the voltage drop across the resistor R (the switch S is now in its left-hand position). The value of the voltage Ux is determined by the formula Ux = EN · r/R, where r is the resistor across which the voltage drop is compensated by Ux.

Figure 1. Diagram of an emf balancer with a standard cell: (Uaux) auxiliary voltage source, (R) calibrated resistor, (rreg) regulating resistor, (Ey) standard cell, (Iop operating current, (G) galvanometer, (S) switch, (Ux) voltage being measured

To measure the current strength Ix by the balanced method, the current is passed through a known resistor R0 and the voltage drop across the resistor IxR0 is measured. The resistance R0 is connected in place of the voltage source Uz shown in Figure 1. To measure power it is necessary to measure voltage and current alternately. To measure resistance the unknown resistor is connected in series with a known resistor in an auxiliary circuit; the voltage drop across the two resistors is then compared. Electrical measuring instruments based on the balanced method are called potentiometers or electrical measurement compensators. The balanced method can also be used to measure AC values; however, the accuracy is lower. The balanced method is widely used in automatic control and regulation.

### REFERENCE

Karandeev, K. B. Spetsial’nye metody elektricheskikh izmerenii. Moscow-Leningrad, 1963.

K. P. SHIROKOV

References in periodicals archive ?
Establishing a fair and balanced method of reaching consensus and assuring corporate privacy make it possible for both large and small enterprises to participate.
* Ensure that the state uses a fair and balanced method to evaluate proposed energy projects that allows for the development of needed infrastructure while providing for public participation
For the water balanced method, parameter [omega] was determined by previous studies [29] and there was uncertainty in the parameter.
In (Tao Shu, Marwan Krunz and SarmaVrudhula, 2005) introduced power balanced method instead of load balanced method.
The mean square stability of the balanced method for SDEs and SDEs with jumps was studied in [13, 14], respectively.
Hu and Gan [22,25] proposed the balanced method for SDEJs (1) and stochastic pantograph equations with jumps, respectively, and proved that the numerical solution converges to the analytical solution with rate 1/2.
During the audience, HRH Premier lauded the prestigious position reached by the GCC press at the Arab and international arenas, which reflects the progress and development of their countries, praising its moderate and balanced method in tackling and defending GCC and Arab issues and refuting fallacious information and defamatory campaigns against the region's peoples and governments.
The researchers concluded that because students ideally need to develop both content knowledge and transferable reasoning skills, teachers needed to develop a more balanced method of education.
This study suggested that the full-sample unbalanced method not only produced SE(PAC)s of schools, school districts, and the whole state similar to those from Yens balanced method, but it also resulted in less variation of SE(PAC) estimates.
While that has always been the cruel nature of the game, there is an undercurrent of support growing for a more balanced method to provide teams with more championship games.
Cell-based processing's granularity enables finer protocol prioritization, a more balanced method for mixing protocols, and efficient bandwidth sharing.
The progressive regulatory and policy framework within the UK has been a significant contributing factor to the growth of its FinTech space, while investors have been encouraged by their balanced method and recognise the potential this brings for rapid adoption and scaling of new approaches.

Site: Follow: Share:
Open / Close