The main feature of a double arm bridge is that the sensitivity of a double arm bridge is many times

What they have in common: they are all instruments for measuring resistance.

Differences: 1. The principle is different: there is only one bridge arm circuit inside the single bridge, and there is a double bridge.

There are two bridge arm circuits: the inner arm is used to measure the value of the resistance being measured, and the inner arm is used to eliminate the influence of lead resistance.

2. Different uses: single bridge is generally used to measure resistance above 10 ohms, and double bridge is generally used to measure resistance less than 10 ohms.

3. The number of buttons at the measuring end is different: two measuring ends on a single bridge and four measuring ends on a double bridge.

4. The measurement power supply is different: the general voltage of the single bridge is above 3V and the current is small, and the general voltage of the double bridge is less than that of the current is larger.

5. The internal structure is different: the three measuring bridge arms of a single bridge are generally independent structures.

The inner arm and outer arm of the double bridge need to be adjusted in tandem, and the resistance value is kept synchronous, and the structure is more complex than that of the single bridge.

2 times. The brigade collapsed and noisy

Original question: The sensitivity of the double-arm bridge is (d) times that of the single-arm bridge.

Double-arm bridges are generally referred to as Kelvin bridges. Kelvin (William Mthomson, 1st Baronkelvin, 1824-1907) was an Irish scientist. Kelvin bridge is a DC flat shirt balance double-arm bridge (referred to as double-arm bridge), which is a commonly used instrument for measuring low resistance (generally between 10 1) and has high measurement accuracy.

What are the main factors for the error of the brother bridge, such as a weight, wind speed, and these are all there.

Why the error of the closed shop bridge ** is mainly affected by the temperature as well as its. smoothness to decide.

The error of recycled B electroglue** is mainly affected by many factors.

Half-bridge single-arm bridging: the advantage is that the connection method is simple, and the strain gauge directly displays the strain value of the measuring point; The disadvantage is that the accuracy is low, and only one point of strain can be measured at a time. Half-bridge double-arm bridge:

The advantages are high accuracy, flexible wiring, and can be used for strain calculation between two points; The disadvantage is that the wiring is complicated, and the strain gauge cannot directly display the strain calculation results between two points. The full-bridge four-arm is similar to the single-bridge double-arm, but the wiring is more complex and can be used for the calculation of a variety of strains.

1. The principle is different: there is only one bridge arm circuit inside the single bridge, and there are two bridge arm circuits in the double bridge: the inner arm and the outer arm, the outer arm is used to measure the value of the measured resistance, and the inner arm is used to eliminate the influence of lead resistance.

2. Different uses: the single Qi stupid dust bridge is generally used to measure the resistance of more than 10 ohms, and the double bridge is generally used to measure the resistance of less than 10 ohms.

3. The number of buttons at the measuring end is different: two measuring ends on a single bridge and four measuring ends on a double bridge.

4. The measured power stall is different: the general voltage of a single bridge is above 3V, and the current is small; The double bridge generally has a lower voltage and a larger current.

5. The internal structure is different: the three measuring bridge arms of a single bridge are generally independent structures. The inner arm and outer arm of the double bridge need to be adjusted in tandem, and the resistance value is kept synchronous, and the structure is more complex than that of the single bridge.

6. In addition to the arm resistance, the Gaochan single bridge does not need another standard resistance; The double bridge requires the addition of standard resistors, some of which are internal and some are external.

7. Limited to the condition that the measurement current cannot be very large, the sensitivity of the double bridge is generally lower than that of the single bridge.

8. The double bridge generally needs to be connected by thicker wires, and the lead resistance is generally required to be no more than one-tenth of the measured resistance.

9. Additional: There is no obvious difference in the anti-interference ability of single bridge and double bridge, which is related to what kind of bridge and the performance of the amplifier plate inside the bridge and the quality of the bridge.

1. Working principle: There is only one bridge arm loop inside the single bridge, and there are two bridge arm circuits in the double bridge, which are respectively for measuring the resistance value and eliminating the influence of the lead resistance.

2. Applicable conditions: single bridge is generally used to measure resistance above 10 ohms, and double bridge is generally used to measure resistance of 10 ohms and below.

3. Measuring end: The single bridge has two measuring ends, and the double bridge has four measuring ends. And the sensitivity of a single bridge is more sensitive than that of a double bridge.

4. Applicable measurement power supply: the general measurement voltage of a single bridge is above 3V; Twin bridges generally measure voltages below.

5. Fuming circuit structure: the single-bridge measurement bridge arm is generally an independent structure and does not require standard resistance; The inner arm and outer arm of the double bridge are linkage adjustment, and the resistance value is guaranteed by the Department of Resistance, which requires standard resistance, and the connecting wire needs to be thick wire, and the structure is more complex than that of the single bridge.

Double-arm bridge. <>

Single-arm bridge. <>