CN204129098U - Single double bridge - Google Patents

Abstract

For a single double bridge for measuring resistance, it is made up of five step discs, can be changed between the two, accomplish dual-use by switching at wheatstone bridge and double bridge.

Description

Single double bridge

Technical field

The utility model relates to the instrument measured resistance.

Background technology

At present, market there is the double bridge of five step discs, also have the wheatstone bridge of five step discs, also there is no single double bridge of five step discs.

Utility model content

The purpose of this utility model is a kind of single double bridge having five step discs of design; The upper limit is measured identical with market there being the QJ49 type wheatstone bridge of five step discs when it uses as wheatstone bridge, reach 1.11110M Ω, when using as double bridge, measurement lower limit is identical with market there being the QJ57 type double bridge of five step discs, or less resolution.

Technical solutions of the utility model are taked like this: the ratio arms of its double bridge is four blade seven throw switch K ₃, four blade seven throw switch K ₃be welded with the measuring resistance of seven four terminated lines above, every measuring resistance four terminals and four blade seven throw switch K ₃on same gear, four layers of contact connect respectively: at × 100 multiplying power gears, 10K Ω measuring resistance four terminals are welded on four layers of contact respectively, at × 10 multiplying power gears, 1K Ω measuring resistance four terminals are welded on four layers of contact respectively, at × 1 multiplying power gear, 100 Ω measuring resistance four terminals are welded on four layers of contact respectively, at × 0.1 multiplying power gear, 10 Ω measuring resistance four terminals are welded on four layers of contact respectively, at × 0.01 multiplying power gear, 1 Ω measuring resistance four terminals are welded on four layers of contact respectively, at × 0.001 multiplying power gear, 0.1 Ω measuring resistance four terminals are welded on four layers of contact respectively, at × 0.0001 multiplying power gear, 0.01 Ω measuring resistance four terminals are welded on four layers of contact respectively, and its comparison arm is five step discs: the first step disc is by having 0, 1, 2, 10 totally 11 gears comparison arm outer arm I with have 0, 1, 2, the comparison arm inner arm I ' composition of 10 totally 11 gears, compare arm outer arm I with comparing between upper every two adjacent contacts of arm inner arm I ' and weld the resistance one that resistance is 100 Ω, the second step disc is by having 0, 1, 2, 10 totally 11 gears comparison arm outer arm II with have 0, 1, 2, the comparison arm inner arm II ' composition of 10 totally 11 gears, compare arm outer arm II with comparing between upper every two adjacent contacts of arm inner arm II ' and weld the resistance one that resistance is 10 Ω, the 3rd step disc is by having 0, 1, 2, 10 totally 11 gears comparison arm outer arm III with have 0, 1, 2, the comparison arm inner arm III ' composition of 10 totally 11 gears, compare arm outer arm III with comparing between every two adjacent contacts of arm inner arm III ' and weld the resistance one that resistance is 1 Ω, the 4th step disc is by having 0, 1, 2, 10 totally 11 gears comparison arm outer arm IV with have 0, 1, 2, the comparison arm inner arm IV ' composition of 10 totally 11 gears, compare arm outer arm IV with comparing between every two adjacent contacts of arm inner arm IV ' and weld the resistance one that resistance is 0.1 Ω, the 5th step disc is by having 0, 1, 2, 10 totally 11 gears comparison arm outer arm V with have 0, 1, 2, the comparison arm inner arm V ' composition of 10 totally 11 gears, compares arm outer arm V with comparing between every two adjacent contacts of arm inner arm V ' and welds the resistance one that resistance is 0.01 Ω, any the stepping of any step disc, compares arm outer arm and compares arm inner arm and to increase or to reduce resistance all identical, the right-hand member of the working power B of electric bridge and the external measured resistance " R of four terminated lines _x" C ₂terminal connects, measured resistance " R _x" P ₂terminal with compare arm outer arm V Metal Contact ring and be connected, relatively " 0 " contact of arm outer arm V connects the Metal Contact ring comparing arm outer arm IV, relatively " 0 " contact of arm outer arm IV connects the Metal Contact ring comparing arm outer arm III, relatively " 0 " contact of arm outer arm III connects the Metal Contact ring comparing arm outer arm II, relatively " 0 " contact of arm outer arm II connects the Metal Contact ring comparing arm outer arm I, compares " 0 " contact and the dpdt double-pole double-throw (DPDT) K of arm outer arm I ₁k ₁₁layer normally closed contact connects, measured resistance " R _x" P ₁terminal with compare arm inner arm V ' Metal Contact ring and be connected, relatively " 0 " contact of arm inner arm V ' connects the Metal Contact ring comparing arm inner arm IV ', relatively " 0 " contact of arm inner arm IV ' connects the Metal Contact ring comparing arm inner arm III ', relatively " 0 " contact of arm inner arm III ' connects the Metal Contact ring comparing arm inner arm II ', relatively " 0 " contact of arm inner arm II ' connects the Metal Contact ring comparing arm inner arm I ', and " 0 " contact of comparing arm inner arm I ' connects dpdt double-pole double-throw (DPDT) K ₁k _1-2layer normally closed contact, K _1-2layer normally closed contact and K _1-1connected by galvanometer G between layer normally closed contact, dpdt double-pole double-throw (DPDT) K ₁k _1-1layer lower contact is by 100 Ω resistance R _mconnect four blade seven throw switch K ₃left side second layer metal contact ring, dpdt double-pole double-throw (DPDT) K ₁k _1-2layer lower contact is by 100 Ω resistance R _{m '}connect four blade seven throw switch K ₃the right second layer metal contact ring, measured resistance " R _x" C ₁terminal and four blade seven throw switch K ₃the right first layer metal contact ring connect, switch K thrown by electric bridge hilted broadsword seven ₂normally closed contact and four blade seven throw switch K ₃left side first layer metal contact ring all connect the left end of working power B, switch K thrown by hilted broadsword seven ₂on have eight resistance, wherein 2.442 Ω resistance one end connect dpdt double-pole double-throw (DPDT) K ₁k _1-1contact above layer, the 2.442 Ω resistance other ends and 21.7604 Ω resistance one end are connected to hilted broadsword seven and throw switch K ₂× 10 ^-3multiplying power contact, the 21.7604 Ω resistance other ends and 198.02 Ω resistance one end are connected to hilted broadsword seven and throw switch K ₂× 10 ^-2multiplying power contact, the 198.02 Ω resistance other ends and 1000 Ω resistance one end are connected to hilted broadsword seven and throw switch K ₂× 0.1 multiplying power contact, the 1000 Ω resistance other ends and 1000 Ω resistance one end are connected to hilted broadsword seven and throw switch K ₂× 1 multiplying power contact, the 1000 Ω resistance other ends and 198.02 Ω resistance one end are connected to hilted broadsword seven and throw switch K ₂× 10 multiplying power contacts, the 198.02 Ω resistance other ends and 21.7604 Ω resistance one end are connected to hilted broadsword seven and throw switch K ₂× 10 ²multiplying power contact, the 21.7604 Ω resistance other ends and 2.442 Ω resistance one end are connected to hilted broadsword seven and throw switch K ₂× 10 ³multiplying power contact, the 2.442 Ω resistance other ends connect dpdt double-pole double-throw (DPDT) K ₁k _1-2contact above layer.The external measured resistance " r of two terminated lines _x" left side terminal connect dpdt double-pole double-throw (DPDT) K ₁k _1-2layer normally closed contact, the external measured resistance " r of two terminated lines _x" the right terminal connect the right-hand member of working power B.

By above technical scheme, dpdt double-pole double-throw (DPDT) K ₁throw to lower contact, single double bridge just becomes double bridge, dpdt double-pole double-throw (DPDT) K ₁throw contact upward, single double bridge just becomes wheatstone bridge, therefore, changes very convenient.

Accompanying drawing explanation

Fig. 1 is this single double bridge basic circuit diagram.

Fig. 2 is this single double bridge dpdt double-pole double-throw (DPDT) K ₁when throwing to lower contact, become the circuit diagram of double bridge.

Fig. 3 is this single double bridge dpdt double-pole double-throw (DPDT) K ₁throw upward contact time, become the circuit diagram of wheatstone bridge.

embodiment

In the drawings, first step disc compares 10 × 100 Ω on the outer arm measure dish I of arm, represent and measurement dish I has 10 resistances to be resistant series of 100 Ω, second step disc compares 10 × 10 Ω on the outer arm measure dish II of arm, represent and measurement dish II has 10 resistances to be resistant series of 10 Ω, in like manner, first step disc compares 10 × 100 Ω on the interior arm measure dish I ' of arm, represent that measurement dish I ' above has 10 resistances to be resistant series of 100 Ω, second step disc compares 10 × 10 Ω on the interior arm measure dish II ' of arm, represent that measurement dish II ' above has 10 resistances to be resistant series of 10 Ω, 3rd, four, five step discs and first, two step discs are identical.

In the drawings, on step disc, thick black line represents Metal Contact ring, and hollow small circle represents hard contact, and four-headed arrow represents metallic brush.

Dpdt double-pole double-throw (DPDT) K ₁when throwing to lower contact, become double bridge as shown in Figure 2, K switch ₃on measuring resistance become an arm of ratio arms, the 100 Ω measuring resistance R on the galvanometer diagonal line left side _mwith 100 Ω measuring resistance R _{m '}the interior outer arm of another ratio arms of composition double bridge, the comparison arm of five step disc composition double bridges, as four blade seven throw switch K ₃put × 100 multiplying power gear time, due to outer arm 100 Ω measuring resistance in the galvanometer left side and four blade seven throw switch K ₃on measuring resistance ratio equal on the right of galvanometer, to compare arm and measured resistance R _xratio, if comparing arm resistance on the right of galvanometer is R _l

Then there are 100 Ω/10K Ω=R _l/ R _xr _x=100 × R _lr _x=100R _l

As four blade seven throw switch K ₃put × 100 multiplying power gear time,

As four blade seven throw switch K ₃put × 0.0001 multiplying power gear time, 100 Ω/0.01 Ω=R _l/ R _xr _x=0.0001R _l

At this moment minimum resolution is 1 μ Ω, Ω J57 type double bridge minimum resolution is 10 μ Ω.

Dpdt double-pole double-throw (DPDT) K ₁when throwing to lower contact, become wheatstone bridge as shown in Figure 3, as hilted broadsword seven throw switch K ₂put × 1000 multiplying power gear time, compare arm when putting full scale, R _x=1000 × 10 (100+10+1+0.1+0.01) Ω R _x=1.11110M Ω this to measure the upper limit with QJ49 type wheatstone bridge identical.

Claims (1)

1. a single double bridge, is characterized in that the ratio arms of its double bridge is four blade seven throw switch K ₃, four blade seven throw switch K ₃be welded with the measuring resistance of seven four terminated lines above, every measuring resistance four terminals and four blade seven throw switch K ₃on same gear, four layers of contact connect respectively: at × 100 multiplying power gears, 10K Ω measuring resistance four terminals are welded on four layers of contact respectively, at × 10 multiplying power gears, 1K Ω measuring resistance four terminals are welded on four layers of contact respectively, at × 1 multiplying power gear, 100 Ω measuring resistance four terminals are welded on four layers of contact respectively, at × 0.1 multiplying power gear, 10 Ω measuring resistance four terminals are welded on four layers of contact respectively, at × 0.01 multiplying power gear, 1 Ω measuring resistance four terminals are welded on four layers of contact respectively, at × 0.001 multiplying power gear, 0.1 Ω measuring resistance four terminals are welded on four layers of contact respectively, at × 0.0001 multiplying power gear, 0.01 Ω measuring resistance four terminals are welded on four layers of contact respectively, and its comparison arm is five step discs: the first step disc is by having 0, 1, 2, 10 totally 11 gears comparison arm outer arm I with have 0, 1, 2, the comparison arm inner arm I ' composition of 10 totally 11 gears, compare arm outer arm I with comparing between upper every two adjacent contacts of arm inner arm I ' and weld the resistance one that resistance is 100 Ω, the second step disc is by having 0, 1, 2, 10 totally 11 gears comparison arm outer arm II with have 0, 1, 2, the comparison arm inner arm II ' composition of 10 totally 11 gears, compare arm outer arm II with comparing between upper every two adjacent contacts of arm inner arm II ' and weld the resistance one that resistance is 10 Ω, the 3rd step disc is by having 0, 1, 2, 10 totally 11 gears comparison arm outer arm III with have 0, 1, 2, the comparison arm inner arm III ' composition of 10 totally 11 gears, compare arm outer arm III with comparing between every two adjacent contacts of arm inner arm III ' and weld the resistance one that resistance is 1 Ω, the 4th step disc is by having 0, 1, 2, 10 totally 11 gears comparison arm outer arm IV with have 0, 1, 2, the comparison arm inner arm IV ' composition of 10 totally 11 gears, compare arm outer arm IV with comparing between every two adjacent contacts of arm inner arm IV ' and weld the resistance one that resistance is 0.1 Ω, the 5th step disc is by having 0, 1, 2, 10 totally 11 gears comparison arm outer arm V with have 0, 1, 2, the comparison arm inner arm V ' composition of 10 totally 11 gears, compares arm outer arm V with comparing between every two adjacent contacts of arm inner arm V ' and welds the resistance one that resistance is 0.01 Ω, any the stepping of any step disc, compares arm outer arm and compares arm inner arm and to increase or to reduce resistance all identical, the right-hand member of the working power B of electric bridge and the external measured resistance " R of four terminated lines _x" C ₂terminal connects, measured resistance " R _x" P ₂terminal with compare arm outer arm V Metal Contact ring and be connected, relatively " 0 " contact of arm outer arm V connects the Metal Contact ring comparing arm outer arm IV, relatively " 0 " contact of arm outer arm IV connects the Metal Contact ring comparing arm outer arm III, relatively " 0 " contact of arm outer arm III connects the Metal Contact ring comparing arm outer arm II, relatively " 0 " contact of arm outer arm II connects the Metal Contact ring comparing arm outer arm I, compares " 0 " contact and the dpdt double-pole double-throw (DPDT) K of arm outer arm I ₁k ₁₁layer normally closed contact connects, measured resistance " R _x" P ₁terminal with compare arm inner arm V ' Metal Contact ring and be connected, relatively " 0 " contact of arm inner arm V ' connects the Metal Contact ring comparing arm inner arm IV ', relatively " 0 " contact of arm inner arm IV ' connects the Metal Contact ring comparing arm inner arm III ', relatively " 0 " contact of arm inner arm III ' connects the Metal Contact ring comparing arm inner arm II ', relatively " 0 " contact of arm inner arm II ' connects the Metal Contact ring comparing arm inner arm I ', and " 0 " contact of comparing arm inner arm I ' connects dpdt double-pole double-throw (DPDT) K ₁k _1-2layer normally closed contact, K _1-2layer normally closed contact and K _1-1connected by galvanometer G between layer normally closed contact, dpdt double-pole double-throw (DPDT) K ₁k _1-1layer lower contact is by 100 Ω resistance R _mconnect four blade seven throw switch K ₃left side second layer metal contact ring, dpdt double-pole double-throw (DPDT) K ₁k _1-2layer lower contact is by 100 Ω resistance R _{m '}connect four blade seven throw switch K ₃the right second layer metal contact ring, measured resistance " R _x" C ₁terminal and four blade seven throw switch K ₃the right first layer metal contact ring connect, switch K thrown by electric bridge hilted broadsword seven ₂normally closed contact and four blade seven throw switch K ₁left side first layer metal contact ring all connect the left end of working power B, switch K thrown by hilted broadsword seven ₂on have eight resistance, wherein 2.442 Ω resistance one end connect dpdt double-pole double-throw (DPDT) K ₁k ₁₁contact above layer, the 2.442 Ω resistance other ends and 21.7604 Ω resistance one end are connected to hilted broadsword seven and throw switch K ₂× 10 ^-3multiplying power contact, the 21.7604 Ω resistance other ends and 198.02 Ω resistance one end are connected to hilted broadsword seven and throw switch K ₂× 10 ²multiplying power contact, the 198.02 Ω resistance other ends and 1000 Ω resistance one end are connected to hilted broadsword seven and throw switch K ₂× 0.1 multiplying power contact, the 1000 Ω resistance other ends and 1000 Ω resistance one end are connected to hilted broadsword seven and throw switch K ₂× 1 multiplying power contact, the 1000 Ω resistance other ends and 198.02 Ω resistance one end are connected to hilted broadsword seven and throw switch K ₂× 10 multiplying power contacts, the 198.02 Ω resistance other ends and 21.7604 Ω resistance one end are connected to hilted broadsword seven and throw switch K ₂× 10 ²multiplying power contact, the 21.7604 Ω resistance other ends and 2.442 Ω resistance one end are connected to hilted broadsword seven and throw switch K ₂× 10 ³multiplying power contact, the 2.442 Ω resistance other ends connect dpdt double-pole double-throw (DPDT) K ₁k _1-2contact above layer, the external measured resistance " r of two terminated lines _x" left side terminal connect dpdt double-pole double-throw (DPDT) K ₁k _1-2layer normally closed contact, the external measured resistance " r of two terminated lines _x" the right terminal connect the right-hand member of working power B.