CN103559824A - Physical standard battery potential difference meter experiment instrument and method for measuring potential difference by means of the experiment instrument - Google Patents

Abstract

A potentiometer experimental instrument for a physical standard battery and a method for measuring potential difference by using the experimental instrument relate to a potentiometer experimental instrument and a method for measuring potential difference by using the potentiometer experimental instrument. It solves the problem that the existing chemical formula standard battery is easily affected by the external environment, the stability of the output electromotive force value is poor, and the measurement accuracy of the potentiometer experimental instrument is poor. The anode of the DC stabilized power supply of the present invention is connected to the anode of the light-emitting diode and one end of the potentiometer at the same time, the cathode of the light-emitting diode is connected to the negative pole of the DC stabilized power supply and one end of the resistor at the same time, and the other end of the resistor is connected to the other end of the potentiometer; potential The positive signal input end of the difference meter is connected to the positive pole of the DC stabilized voltage power supply, and the negative signal input end of the potentiometer is connected to the active end of the potentiometer. Use the experimental instrument to measure the potential difference of the device under test, adjust the movable end of the potentiometer RP, and realize the measurement of the potential difference of the device under test. The invention is suitable for measuring potential differences.

Description

Potentiometer experimental instrument for physical standard battery and method for measuring potential difference using the experimental instrument

technical field

The invention relates to a potentiometer experimental instrument and a method for measuring potential difference by using the potentiometer experimental instrument.

Background technique

The standard battery used in the potentiometer tester is generally a chemical battery, which is greatly affected by temperature, especially the change of the indoor ambient temperature will cause the change of the output electromotive force of the chemical standard battery. Therefore, it must be calibrated according to the law of temperature change before each use. The chemical standard battery can only be used; and the chemical standard battery cannot be tilted, let alone shaken or inverted, otherwise the chemical substances in the glass tube will be mixed together, which will affect the electromotive force value and stability, and even cannot be used; in addition, the chemical standard battery also cannot be used. It is greatly affected by light, because the depolarizer mercurous sulfate of the standard battery is a photosensitive substance, which will deteriorate after being exposed to light, which will make polarization and hysteresis serious. Therefore, the potentiometer experiment will add a lot of precautions according to the characteristics of the chemical battery. A little carelessness of the students will affect the output electromotive force value and stability, resulting in inaccurate measurement accuracy and even damage to the chemical standard battery.

Contents of the invention

In order to solve the problem that the existing chemical formula standard battery is easily affected by the external environment, the stability of the output electromotive force value is poor, and the measurement accuracy of the potentiometer test instrument is poor, the potentiometer test instrument of the physical formula standard battery and its utilization are proposed. The electric experiment instrument measures the method of potential difference.

The potentiometer experimental instrument of the physical type standard battery of the present invention, this experimental instrument comprises DC stabilized voltage supply E, light-emitting diode D, resistance R and potentiometer RP and potentiometer A;

The positive pole of the DC stabilized power supply E is connected to the anode of the light-emitting diode D and one end of the potentiometer RP at the same time, the cathode of the light-emitting diode D is connected to the negative pole of the DC stabilized power supply E and one end of the resistor R at the same time, and the other end of the resistor R is connected to the potentiometer RP The other end of the potentiometer A; the positive signal input terminal of the potentiometer A is connected to the positive pole of the DC power supply E, and the negative signal input terminal of the potentiometer A is connected to the active terminal of the potentiometer RP.

Utilize the method for measuring potential difference with the potentiometer experimental instrument of above-mentioned physical type standard battery, the specific steps of this method are:

First, connect the positive signal output terminal of the device under test to the positive signal input terminal of the potentiometer A, and connect the negative signal input terminal of the potentiometer A to the negative signal output terminal of the device under test;

Then adjust the movable end of the potentiometer RP, so that the millivolt-level electromotive force is output between the movable end of the potentiometer RP and the fixed end connected to the potentiometer experimental instrument;

Adjust the movable end of the potentiometer RP according to the potential difference of the device under test to a range suitable for the potential difference of the device under test to realize the measurement of the potential difference of the device under test.

The substitution device of the chemical standard battery of the potentiometer experiment instrument of the present invention is realized by a physical method, and is not affected by environmental factors such as ambient temperature and light, and does not need to calibrate the standard battery according to indoor temperature changes before each use. Accidentally turn the standard battery upside down and shake it, it can still output a stable electromotive force. The invented standard battery replacement device can meet the needs of the potentiometer experimental instrument with a measurement range of 0-170mv, and the size is adjustable and the stability is good. Compared with the existing chemical formula standard battery, the stability has increased by 10% year-on-year, and it is effective The measurement accuracy of the potentiometer experimental instrument is improved, and the measurement accuracy of the potentiometer experimental instrument using the device of the present invention is compared with the potentiometer experimental instrument using a standard battery, and the measurement accuracy is improved by 20% year-on-year.

Description of drawings

FIG. 1 is a schematic diagram of the circuit structure of a potentiometer experiment instrument for a physical standard battery according to the present invention.

Detailed ways

Embodiment 1. This embodiment is described in conjunction with FIG. 1. The potentiometer experimental instrument of the physical type standard battery described in this embodiment includes a DC stabilized voltage power supply E, a light emitting diode D, a resistor R and a potentiometer RP and Potentiometer A;

The positive pole of the DC stabilized power supply E is connected to the anode of the light-emitting diode D and one end of the potentiometer RP at the same time, the cathode of the light-emitting diode D is connected to the negative pole of the DC stabilized power supply E and one end of the resistor R at the same time, and the other end of the resistor R is connected to the potentiometer RP The other end of the potentiometer A; the positive signal input terminal of the potentiometer A is connected to the positive pole of the DC power supply E, and the negative signal input terminal of the potentiometer A is connected to the active terminal of the potentiometer RP.

The potentiometer experimental instrument of physical type standard battery of the present invention relates to university physics experimental instrument; Especially potentiometer experimental instrument, potentiometer experimental instrument is the specialized instrument that is used for accurately measuring battery electromotive force or potential difference, laboratory The required standard battery can meet the requirements of the potentiometer experiment instrument with a measuring range of 0-170mv, and has good stability. When the indoor temperature and light change, the output electromotive force of the standard battery can work stably. Before each use, it does not need to change according to the temperature Calibrate the standard battery, you can use it directly for measurement; the standard battery can still output a stable electromotive force after being inverted and shaken, and the output electromotive force of the standard battery itself can be adjusted.

The current standard battery is a kind of chemical battery, which is greatly affected by temperature. Changes in ambient temperature will cause changes in the electromotive force of the chemical standard battery. Therefore, it must be calibrated according to the law of temperature changes before each use, and the chemical standard battery can be used. The battery cannot be tilted, let alone shaken and turned upside down, otherwise the chemical substances in the glass tube will be mixed together, which will affect the output electromotive force value and stability, and even cannot be used. Existing chemical standard batteries are greatly affected by light, because the depolarizer mercurous sulfate of standard batteries is a photosensitive substance, which will deteriorate after being exposed to light, which will make polarization and hysteresis serious; chemical standard battery output The electromotive force size standard battery itself cannot be adjusted, and the substitution device of the chemical standard battery of the potentiometer experiment instrument of the present invention is realized by a physical method, and is not affected by environmental factors such as ambient temperature and light, and does not need to be calibrated according to indoor temperature changes before each use standard battery. Accidentally turn the standard battery upside down and shake it, it can still output a stable electromotive force.

The standard battery replacement device described in the present invention can meet the requirements of the potentiometer experimental instrument with a measuring range of 0-170mv, and has adjustable size and good stability, which greatly improves the experimental efficiency of students and the selectivity of teacher-designed experiments. The replacement device of the standard battery of the differential meter tester also has the characteristics of simple manufacture, energy saving, environmental protection, economy and durability.

Specific Embodiment 2. This embodiment is a further description of the potentiometer experimental instrument for a physical standard battery described in Specific Embodiment 1. The DC stabilized power supply E adopts a DC stabilized power supply with a voltage of 3V.

Specific Embodiment 3. This embodiment is a further description of the potentiometer experimental instrument for a physical standard battery described in Specific Embodiment 1. The light-emitting diode D is a light-emitting diode with a power of 1W.

Embodiment 4. This embodiment is a further description of the potentiometer experimental instrument for a physical standard battery described in Embodiment 1. The measuring range of the potentiometer A is 0mv-170mv.

Specific embodiment five, utilize the method for measuring the potential difference of the potentiometer experiment instrument of physical formula standard battery described in specific embodiment one, the specific steps of this method are:

First, connect the positive signal output terminal of the device under test to the positive signal input terminal of the potentiometer A, and connect the negative signal input terminal of the potentiometer A to the negative signal output terminal of the device under test;

Then adjust the movable end of the potentiometer RP, so that the millivolt-level electromotive force is output between the movable end of the potentiometer RP and the fixed end connected to the potentiometer experimental instrument;

Adjust the movable end of the potentiometer RP according to the potential difference of the device under test to a range suitable for the potential difference of the device under test to realize the measurement of the potential difference of the device under test.

Advantages of the present invention:

1. The replacement device of the standard battery described in the present invention is realized by physical methods.

2. The output electromotive force of the potentiometer experiment instrument of the physical standard battery described in the present invention is continuously adjustable.

3. The potentiometer tester of the physical standard battery described in the present invention can meet the requirement of measuring range 0-170mv of the potentiometer tester.

4. The potentiometer experiment instrument of the physical type standard battery of the present invention is not affected by environmental factors such as ambient temperature and light, and the standard battery does not need to be calibrated according to indoor temperature changes before each use.

5. The potentiometer experimental instrument of physical standard battery described in the present invention is easy to use, simple to manufacture, energy-saving and environmentally friendly, low in cost, stable and durable, and has good experimental results.

6. The potentiometer experiment instrument of the physical type standard battery described in the present invention can output stable electromotive force without affecting the use after it is turned upside down and shaken.

7. The potentiometer test instrument for a physical standard battery of the present invention also has the characteristics of simple manufacture, energy saving, environmental protection, economy and durability.

Claims (5)

1. the potential meter experiment instrument of physical type standard cell, is characterized in that, this experiment instrument comprises D.C. regulated power supply (E), light emitting diode (D), resistance R and potentiometer (RP) and potential difference meter (A);

The anodal anode of connecting luminous diode (D) simultaneously of D.C. regulated power supply (E) and one end of potentiometer (RP), the negative electrode of light emitting diode (D) connects the negative pole of D.C. regulated power supply (E) and one end of resistance R simultaneously, and the other end of resistance R connects the other end of potentiometer (RP); The positive electric signal input end of potential difference meter (A) connects the positive pole of D.C. regulated power supply (E), and the negative electricity signal input part of potential difference meter (A) connects the movable end of potentiometer (RP).

2. the potential meter experiment instrument of physical type standard cell according to claim 1, is characterized in that, D.C. regulated power supply (E) adopts the D.C. regulated power supply that voltage is 3V.

3. the potential meter experiment instrument of physical type standard cell according to claim 1, is characterized in that, light emitting diode (D) adopts the light emitting diode that power is 1W.

4. the potential meter experiment instrument of physical type standard cell according to claim 1, is characterized in that, the measurement range of potential difference meter (A) is 0mv-170mv.

5. utilize the potential meter experiment instrument of the physical type standard cell described in claim 1 to measure the method for potential difference (PD), it is characterized in that, the concrete steps of the method are:

First the positive electrical signal of device under test is connected to the positive electric signal input end of potential difference meter (A), the negative electricity signal input part of potential difference meter (A) connects device under test negative electricity signal output part;

Then reconcile the movable end of potentiometer (RP), make the movable end of potentiometer (RP) and the stiff end that is connected with potential meter experiment instrument between an output millivolt level electromotive force;

According to the movable end of the potential difference (PD) regulator potentiometer (RP) of device under test, to the range that is applicable to the potential difference (PD) of device under test, realize the measurement to device under test potential difference (PD).

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