CN202583325U - Device using substitution method to measure resistance - Google Patents

Abstract

The present utility model discloses a device using a substitution method to measure resistance. The device comprises an adjustable resistor, a measured resistor, a power supply, a single-pole single-throw switch, a current-limiting resistor, an ammeter and a single-pole double-throw switch, one end of the measured resistor is connected with one end of the adjustable resistor, the above connecting part is successively connected with the power supply, the single-pole single-throw switch, the current-limiting resistor, the ammeter and a fixed contact of the single-pole double-throw switch in series through a conducting wire; the other end of the measured resistor is connected with a first movable contact of the single-pole double-throw switch; the other end of the adjustable resistor is connected with a second movable contact of the single-pole double-throw switch; and the adjustable resistor is a standard resistance box. The device is simple in structure, is practical and convenient, and is favorable for accurate measuring of resistance values.

Description

Alternative Method for Measuring Resistance

technical field

The utility model relates to a resistance measuring device, in particular to a resistance measuring device by an alternative method.

Background technique

At present, the methods for measuring resistance mainly include voltammetry and multimeter resistance file measurement. The former needs to measure voltage and current at the same time, and the measurement accuracy is limited due to the influence of the internal resistance of the voltmeter or ammeter; the latter is not accurate enough due to the influence of the internal resistance of the battery.

Utility model content

The purpose of the utility model is to overcome the deficiencies of the prior art and provide an alternative resistance measuring device with relatively accurate measurement results.

In order to achieve the above object, the utility model takes the following technical solutions:

A resistance measuring device by an alternative method, comprising an adjustable resistance, a measured resistance, a power supply, a single-pole single-throw switch, a current-limiting resistance, an ammeter and a single-pole double-throw switch, one end of the measured resistance is connected to one end of the adjustable resistance The connection is connected in series with the power supply, the SPST switch, the current limiting resistor, the ammeter and the fixed contact of the SPDT switch through wires; the other end of the measured resistance is connected to the SPDT The first movable contact of the switch; the other end of the adjustable resistor is connected to the second movable contact of the SPDT switch.

Further, the adjustable resistance is a standard resistance box.

The measurement steps and principles are as follows: Step 1: close the SPST switch, turn the SPDT switch to the first movable contact to connect the measured resistance to the circuit, and read the reading of the ammeter. Step 2: Turn the SPDT switch to the second movable contact to connect the adjustable resistor to the circuit, adjust the resistance value of the adjustable resistor so that the reading of the ammeter is the same as that measured in the first step The readings are the same. At this time, the adjustable resistor just equivalently replaces the measured resistance, thereby measuring the resistance value of the measured resistance.

Due to the adoption of the above design, the utility model overcomes the disadvantages of the traditional resistance measurement method, has a simple structure, is practical and convenient, and is beneficial to accurate measurement of the resistance value.

Description of drawings

Below in conjunction with accompanying drawing, the utility model is further described.

Fig. 1 is a schematic circuit diagram of the utility model.

In the figure: 1. Adjustable resistor, 2. Tested resistor, 3. Power supply, 4. SPST switch, 5. Current limiting resistor, 6. Ammeter, 7. SPDT switch, 8. First moving contact , 9. The second moving contact.

Detailed ways

As shown in Figure 1, the resistance measuring device of the utility model alternative method includes an adjustable resistance 1, a measured resistance 2, a power supply 3, a SPST switch 4, a current limiting resistor 5, an ammeter 6 and a SPDT switch 7. One end of the resistor 2 is connected to one end of the adjustable resistor 1, and the connection is connected in series with the fixed contacts of the power supply 3, the SPST switch 4, the current limiting resistor 5, the ammeter 6 and the SPDT switch 7 through wires; The other end of the resistor 2 is connected to the first movable contact 8 of the SPDT switch; the other end of the adjustable resistor 1 is connected to the second movable contact 9 of the SPDT switch.

The adjustable resistor 1 is a standard resistor box.

The current-limiting resistor 5 is used to control the magnitude of the current in the circuit to prevent excessive current in the circuit.

The specific measurement is divided into two steps, the first step: close the SPST switch 4, turn the SPDT switch 7 to the first movable contact 8 to connect the measured resistance 2 to the circuit, and read the reading of the ammeter 6 at this time. Step 2: Turn the SPDT switch 7 to the second movable contact 9 to connect the adjustable resistor 1 to the circuit, and adjust the resistance value of the adjustable resistor 1 so that the reading of the ammeter 6 is the same as that measured in the first step. Read the resistance value of the adjustable resistor 1 at this time, and the resistance value is the resistance value of the measured resistor 2.

Claims (2)

1. An alternative method of measuring resistance device is characterized in that: comprising adjustable resistance, measured resistance, power supply, SPST switch, current limiting resistor, ammeter and SPDT switch, one end of said measured resistance is connected to said measured resistance One end of the adjustable resistor is connected, and the connection is connected in series with the power supply, the SPST switch, the current limiting resistor, the ammeter, and the fixed contact of the SPDT switch through a wire; the other end of the measured resistor connected to the first movable contact of the single-pole double-throw switch; the other end of the adjustable resistor is connected to the second movable contact of the single-pole double-throw switch. 2. The resistance measuring device according to claim 1, characterized in that: the adjustable resistance is a standard resistance box.

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