CN204228799U - Wheatstone bridge and potential difference meter double-purpose instrument - Google Patents
Wheatstone bridge and potential difference meter double-purpose instrument Download PDFInfo
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- CN204228799U CN204228799U CN201420549526.0U CN201420549526U CN204228799U CN 204228799 U CN204228799 U CN 204228799U CN 201420549526 U CN201420549526 U CN 201420549526U CN 204228799 U CN204228799 U CN 204228799U
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Abstract
For wheatstone bridge and the potential difference meter double-purpose instrument of measuring resistance, voltage, it is made up of five measurement dishes, can be changed between the two, accomplish dual-use by switching at potential difference meter and wheatstone bridge.
Description
Technical field
The utility model relates to the instrument measured voltage, resistance.
Background technology
Potential difference meter and wheatstone bridge are all with wire-wound resistor as instrument main element, and it is about the same that potential difference meter measurement dish and the wheatstone bridge of some model compare arm, but potential difference meter can not direct measuring resistance, and wheatstone bridge can not measuring voltage.
Utility model content
The purpose of this utility model, is a kind of wheatstone bridge of design and potential difference meter double-purpose instrument, using the comparison arm of the measurement dish of potential difference meter as wheatstone bridge, realizes dual-use.
The technical solution of the utility model is taked like this: the working power of potential difference meter adopts external YJ49 type adjustable height stabilized power source B, and adjustable height stabilized power source B output voltage regulates between 2.3 ~ 2.4V, single bridge and potential difference meter double-purpose instrument have five step discs, and the first step disc has 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, the measurement dish I of 22 totally 23 gears, measurement dish I welds 1000 Ω resistance one between every two adjacent contacts, and the second step disc is by having 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 totally 11 gears measurement dish II with have 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, the replacement dish II ' composition of 10 totally 11 gears, weld the resistance one that resistance is 100 Ω between upper every two adjacent contacts of measurement dish II and replacement dish II ', the 3rd step disc is by having 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 totally 11 gears measurement dish III with have 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, the replacement dish III ' composition of 10 totally 11 gears, weld the resistance one that resistance is 10 Ω between measurement dish III with every two adjacent contacts of replacement dish III ', the 4th step disc is by having 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 totally 11 gears measurement dish IV with have 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, the replacement dish IV ' composition of 10 totally 11 gears, " weld the resistance one that resistance is 1 Ω between every two adjacent contacts, the 5th step disc is by having 0 for measurement dish IV and replacement dish iV, 1, 2, 3, 4, 5, 6, 7, 8, 9, the measurement dish V of 10 totally 11 gears forms, and weld the resistance one that resistance is 0.1 Ω between every two adjacent contacts of measurement dish V, adjustable height stabilized power source B positive pole is through the adjustable resistance R of range of adjustment between 0 ~ 1000 Ω
p" 10 " contact of rear connection replacement dish II ', replacement dish II ' Metal Contact ring connects " 10 " contact of replacement dish III ', replacement dish III ' Metal Contact ring connects " 10 " contact of replacement dish IV ', the Metal Contact ring of replacement dish IV ' connects " 10 " contact of measurement dish V, " 0 " contact of measurement dish V connects the Metal Contact ring of measurement dish IV, " 0 " contact of measurement dish IV connects the Metal Contact ring of measurement dish III, " 0 " contact of measurement dish III connects the Metal Contact ring of measurement dish II, " 0 " contact of measurement dish II connects " 0 " contact of measurement dish I, " 22 " contact of measurement dish I connects adjustable height stabilized power source B negative pole, for connecting measured voltage " U
x" two measure terminals, negative pole terminal is connected with the Metal Contact ring of measurement dish I, and positive pole terminal is through K switch
1contact " 1 " and K switch
1normally closed contact and galvanometer G
1the Metal Contact ring of measurement dish V is connected again after connection, it is characterized in that K switch
1electric bridge ratio switch K is connected to when putting contact " 2 "
2normally closed contact, electric bridge ratio switch K
2× 1000 multiplying power contacts, through the resistance connected node C of 10 Ω, through the resistance connected node D of 10K Ω, electric bridge ratio switch K
2× 100 multiplying power contacts, through the resistance connected node C of 100 Ω, through the resistance connected node D of 10K Ω, electric bridge ratio switch K
2× 10 multiplying power contacts, through the resistance connected node C of 1K Ω, through the resistance connected node D of 10K Ω, electric bridge ratio switch K
2× 10
-3multiplying power contact, through the resistance connected node C of 10K Ω, through the resistance connected node D of 10 Ω, electric bridge ratio switch K
2× 1 multiplying power contact, through the resistance connected node C of 1K Ω, the resistance through 818.182 Ω connects electric bridge ratio switch K
2× 0.1 multiplying power contact, then connect electric bridge ratio switch K through the resistance of 162.0164 Ω
2× 10
-2multiplying power contact, then through the resistance connected node D of 19.802 Ω, electric bridge external power supply E left side terminal is connected with the Metal Contact ring of the first step disc through node C, and on the right of electric bridge external power supply E, terminal is through node D and external measured resistance " R
x" below terminal connect, external measured resistance " R
x" terminal above connect the Metal Contact ring of measurement dish V.
By above technical scheme, five measurement dishes of potential difference meter can compare arm as wheatstone bridge and use, and which achieves dual-use.
Accompanying drawing explanation
Fig. 1 is this wheatstone bridge and potential difference meter double-purpose instrument circuitry figure.In FIG, 22 × 1000 Ω on first step disc measurement dish I, represent and measurement dish I has 22 resistances to be resistant series of 1000 Ω, 10 × 100 Ω on second step disc measurement dish II and replacement dish II ', represent and measurement dish II and replacement dish II ' has 10 resistances to be resistant series of 100 Ω, in like manner, 10 × 10 Ω represent that 10 resistances are resistant series of 10 Ω, 10 × 1 Ω represent that 10 resistances are resistant series of 1 Ω, and 10 × 0.1 Ω represent that 10 resistances are resistant series of 0.1 Ω; In the drawings, thick black line represents Metal Contact ring, and four-headed arrow represents brush.
Fig. 2 is the potential difference meter part of this wheatstone bridge and potential difference meter double-purpose instrument.
Fig. 3 is the wheatstone bridge part of this wheatstone bridge and potential difference meter double-purpose instrument.In figure, × 1000 multiplying power two ratio arms joints are M, and × 100 multiplying power two ratio arms joints are N, and × 10 multiplying power two ratio arms joints are 0, and × 1 multiplying power two ratio arms joint is A, and × 0.1 multiplying power two ratio arms joint is F, × 10
-2multiplying power two ratio arms joint is H, × 10
-3multiplying power two ratio arms joint is P.
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.
Embodiment
In FIG, K switch is worked as
1during set contact, although node C is connected, due to K switch with the Metal Contact ring of the first step disc
1" 2 " contact disconnect, wheatstone bridge power supply " E " and wheatstone bridge are by test arm resistance " R
x" do not connect, wheatstone bridge and potential difference meter double-purpose instrument just become the such potentiometer circuit of Fig. 2.In fig. 2, second, third, the resistance that measurement dish increases in the 4th step disc equals the resistance that replacement dish reduces, therefore, when each step disc rotates, potential difference meter loop always hinders constant, when upper 22 the 1000 Ω two ends of measurement dish I connect 2.2V standard voltage signal, by regulating adjustable resistance R
pmake galvanometer G
2nulling, potential difference meter working current is just accurately locked as 0.1mA, at this moment, tested voltage peace polarity connection at " U
x" two measure between terminals, regulate each measurement dish, make galvanometer G
2nulling, the reading of each measurement dish is exactly the value of tested voltage.
It is 23111.0 Ω that each step disc of potential difference meter always hinders, temperature change can cause resistance change, thus affect potential difference meter accuracy of measurement, this potential difference meter standard voltage signal is the head and the tail two ends being connected to the first step disc resistance, how no matter the upper 22000 Ω resistance of potential difference meter measurement dish I become with temperature, always input standard voltage signal 2.2 volts above it accurately; Therefore, potential difference meter 22000 Ω resistance can regard not temperature influence as, temperature influence only have 1111 Ω, account for total resistance about 5%, so the accuracy that this potential difference meter is measured can regard not temperature influence as; On potential difference meter step disc, each resistance creates and always has error, and this potential difference meter 22000 Ω resistance can be regarded as does not have error, the error of any resistance, just very little on affecting complete machine, and therefore, the accuracy that this potential difference meter is measured can be done very high.
In FIG, K switch is worked as
1when putting " 2 " contact, wheatstone bridge and potential difference meter double-purpose instrument just become the such wheatstone bridge circuit of Fig. 3; At this moment, the external adjustable height stabilized power source B needed for using as potential difference meter, external standard signal voltage E
nall do not access, wheatstone bridge compares arm five step disc R
lrepresent, wheatstone bridge passing ratio switch K
2conversion different multiplying:
In × 1000 multiplying powers, R
x/ R
l=R
dM/ R
cMΩ=1000 ,=10K Ω/10, so R
x=1000R
l;
In × 100 multiplying powers, R
x/ R
l=R
dN/ R
cNΩ=100 ,=10K Ω/100, so R
x=100R
l;
In × 10 multiplying powers, R
x/ R
l=R
dO/ R
cO=10K Ω/1K Ω=10, so R
x=10R
l;
In × 1 multiplying power, R
x/ R
l=R
dA/ R
cA=(19.802+162.0164+818.182) Ω/1K Ω=1, so R
x=R
l;
In × 0.1 multiplying power, R
x/ R
l=R
dF/ R
cF=(19.802+162.0164) Ω/(1000+818.182) Ω=0.1, so R
x=0.1R
l;
× 10
-2multiplying power, R
x/ R
l=R
dH/ R
cH=19.802 Ω=0.01, Ω/1980.195, so R
x=0.01R
l;
× 10
-3multiplying power, R
x/ R
l=R
dP/ R
cP=10 Ω/10K Ω=0.001, so R
x=0.001R
l;
Therefore this instrument can measuring voltage again can measuring resistance, there are wheatstone bridge, potential difference meter two kinds of functions.
Claims (2)
1. wheatstone bridge and a potential difference meter double-purpose instrument, the working power of potential difference meter adopts external YJ49 type adjustable height stabilized power source B, and adjustable height stabilized power source B output voltage regulates between 2.3 ~ 2.4V, single bridge and potential difference meter double-purpose instrument have five step discs, and the first step disc has 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, the measurement dish I of 22 totally 23 gears, measurement dish I welds 1000 Ω resistance one between every two adjacent contacts, and the second step disc is by having 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 totally 11 gears measurement dish II with have 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, the replacement dish II ' composition of 10 totally 11 gears, weld the resistance one that resistance is 100 Ω between upper every two adjacent contacts of measurement dish II and replacement dish II ', the 3rd step disc is by having 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 totally 11 gears measurement dish III with have 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, the replacement dish III ' composition of 10 totally 11 gears, weld the resistance one that resistance is 10 Ω between measurement dish III with every two adjacent contacts of replacement dish III ', the 4th step disc is by having 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 totally 11 gears measurement dish IV with have 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, the replacement dish IV ' composition of 10 totally 11 gears, " weld the resistance one that resistance is 1 Ω between every two adjacent contacts, the 5th step disc is by having 0 for measurement dish IV and replacement dish IV, 1, 2, 3, 4, 5, 6, 7, 8, 9, the measurement dish V of 10 totally 11 gears forms, and weld the resistance one that resistance is 0.1 Ω between every two adjacent contacts of measurement dish V, adjustable height stabilized power source B positive pole is through the adjustable resistance R of range of adjustment between 0 ~ 1000 Ω
p" 10 " contact of rear connection replacement dish II ', replacement dish II ' Metal Contact ring connects " 10 " contact of replacement dish III ', replacement dish III ' Metal Contact ring connects " 10 " contact of replacement dish IV ', the Metal Contact ring of replacement dish IV ' connects " 10 " contact of measurement dish V, " 0 " contact of measurement dish V connects the Metal Contact ring of measurement dish IV, " 0 " contact of measurement dish IV connects the Metal Contact ring of measurement dish III, " 0 " contact of measurement dish III connects the Metal Contact ring of measurement dish II, " 0 " contact of measurement dish II connects " 0 " contact of measurement dish I, " 22 " contact of measurement dish I connects adjustable height stabilized power source B negative pole, for connecting measured voltage " U
x" two measure terminals, negative pole terminal is connected with the Metal Contact ring of measurement dish I, and positive pole terminal is through K switch
1contact " 1 " and K switch
1normally closed contact and galvanometer G
1the Metal Contact ring of measurement dish V is connected again after connection, it is characterized in that K switch
1electric bridge ratio switch K is connected to when putting contact " 2 "
2normally closed contact, electric bridge ratio switch K
2× 1000 multiplying power contacts, through the resistance connected node C of 10 Ω, through the resistance connected node D of 10K Ω, electric bridge ratio switch K
2× 100 multiplying power contacts, through the resistance connected node C of 100 Ω, through the resistance connected node D of 10K Ω, electric bridge ratio switch K
2× 10 multiplying power contacts, through the resistance connected node C of 1K Ω, through the resistance connected node D of 10K Ω, electric bridge ratio switch K
2× 10
-3multiplying power contact, through the resistance connected node C of 10K Ω, through the resistance connected node D of 10 Ω, electric bridge ratio switch K
2× 1 multiplying power contact, through the resistance connected node C of 1K Ω, the resistance through 818.182 Ω connects electric bridge ratio switch K
2× 0.1 multiplying power contact, then connect electric bridge ratio switch K through the resistance of 162.0164 Ω
2× 10
-2multiplying power contact, then through the resistance connected node D of 19.802 Ω, electric bridge external power supply E left side terminal is connected with the Metal Contact ring of the first step disc through node C, and on the right of electric bridge external power supply E, terminal is through node D and external measured resistance " R
x" below terminal connect, external measured resistance " R
x" terminal above connect the Metal Contact ring of measurement dish V.
2. wheatstone bridge according to claim 1 and potential difference meter double-purpose instrument, is characterized in that as potential difference meter standard voltage signal be the head and the tail two ends being connected to the first step disc resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420549526.0U CN204228799U (en) | 2014-09-22 | 2014-09-22 | Wheatstone bridge and potential difference meter double-purpose instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420549526.0U CN204228799U (en) | 2014-09-22 | 2014-09-22 | Wheatstone bridge and potential difference meter double-purpose instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204228799U true CN204228799U (en) | 2015-03-25 |
Family
ID=52926879
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420549526.0U Active CN204228799U (en) | 2014-09-22 | 2014-09-22 | Wheatstone bridge and potential difference meter double-purpose instrument |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204228799U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106093513A (en) * | 2016-07-28 | 2016-11-09 | 富阳兴远仪器仪表经营部 | A kind of can measure conventional, electric-resistance, high resistant, superelevation resistance electric bridge |
| CN104215811B (en) * | 2014-09-22 | 2017-01-18 | 富阳精密仪器厂 | Single arm electric bridge and potentiometer dual purpose meter |
-
2014
- 2014-09-22 CN CN201420549526.0U patent/CN204228799U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104215811B (en) * | 2014-09-22 | 2017-01-18 | 富阳精密仪器厂 | Single arm electric bridge and potentiometer dual purpose meter |
| CN106093513A (en) * | 2016-07-28 | 2016-11-09 | 富阳兴远仪器仪表经营部 | A kind of can measure conventional, electric-resistance, high resistant, superelevation resistance electric bridge |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |