CN204008799U - There is the pressure measuring instrument of temperature compensation dish - Google Patents
There is the pressure measuring instrument of temperature compensation dish Download PDFInfo
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- CN204008799U CN204008799U CN201420419425.1U CN201420419425U CN204008799U CN 204008799 U CN204008799 U CN 204008799U CN 201420419425 U CN201420419425 U CN 201420419425U CN 204008799 U CN204008799 U CN 204008799U
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- dish
- resistance
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- step disc
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Abstract
A kind of pressure measuring instrument that has temperature compensation dish for DC voltage measurement, wherein its four step discs below are all coiled with the replacement dish identical with measurement dish structure and are formed by measurement, four step disc measurement dishes next are connected to each other on rear three step discs and all there is no resistance with the corresponding contact on replacement dish, and it makes pressure measuring instrument inner lead resistance, switch contact resistance and variation, thermoelectrical potential that pressure measuring instrument is affected and can both be ignored.
Description
Technical field
The utility model relates to the instrument that DC voltage is measured.
Background technology
The current pressure measuring instrument for there being five step discs, in the connection between five step discs, telophragma generally adopts switching over, so just produces the variation of contact resistance, brings restriction to resolution.In order to overcome this problem, generally adopt large brush with enlarge active surface, and adopt silver-carbon/carbon-copper composite material; Application number 200810121911.4 discloses the new method that has the pressure measuring instrument of five step discs to solve switch contact resistance variation, its five step discs are all coiled by measurement and replacement dish forms, not containing bracket panel, on each measurement dish and replacement dish, there is resistance, measurement dish and replacement dish on its five step discs have formed bridge circuit in circuit, the defect of its maximum is that error is not independent, once it is overproof that certain some indicating value is coiled in measurement, just cannot determine which resistance is overproof causes, this makes troubles to qualification and maintenance.
Utility model content
The purpose of this utility model is a kind of pressure measuring instrument that has five step discs of design, and it does not adopt bridge circuit, and error can be independent like this, and there is no resistance between rear three step disc contacts, and this can reduce costs, and reduces instrument volume.
The technical solution of the utility model is taked like this: from range of adjustment, the anodal terminal of the external working power E between 10.2～11V passes through by 22 adjustable resistance R that 4 Ω resistance are in series pressure measuring instrument
p1, by 22 adjustable resistance R that 0.2 Ω resistance is in series
p2, and the adjustable resistance R of range of adjustment between 0～0.22 Ω
p3, through five step discs, to 101.8 Ω set up resistance R
n, then through there being the temperature compensation dish W of 18 × 0.05 Ω resistance in seriess to get back to the external working power E negative pole terminal composition pressure measuring instrument work loop of range of adjustment between 10.2～11V above, from external saturated standard cell E
nanodal terminal is through being connected to the double-point double-throw switch K of galvanometer G between two normally closed contacts
2set up resistance R to 101.8 Ω
nget back to external saturated standard cell E through the temperature compensation dish W that has 18 × 0.05 Ω resistance in seriess above again
nnegative pole terminal composition pressure measuring instrument standard loop, be used for connecting measured " U
x" two terminals, anodal terminal is after five measurement dishes, then through being connected to the double-point double-throw switch K of galvanometer G between two normally closed contacts
2to negative pole terminal composition pressure measuring instrument equalizing network, it is characterized in that it have 0,1,2 ... the 18 temperature compensation dish W of totally 19 gears, weld one of 0.05 Ω resistance between every two adjacent contacts of temperature compensation dish W, temperature compensation dish W " 0 " contact 0.1 Ω resistance R in parallel with " 18 " two ends, contact
9, it separately has six step discs, and the first step disc is to have 0, 1, 2, the 20 measurement dish I of totally 21 gears, weld one of 0.1 Ω resistance between upper every two adjacent contacts of measurement dish I, and the second step disc is by having 0, 1, 2, 10 totally 11 gears measurement dish II with have 0, 1, 2, the 10 replacement dish II ' compositions of totally 11 gears, between upper every two adjacent contacts of measurement dish II and replacement dish II ', weld resistance and be one of the resistance of 0.1111 Ω, " 0 " contact of measurement dish II is circuit node A, " 10 " contact of replacement dish II ' is circuit node B, and the 3rd step disc is by having 0, 1, 2, 10 totally 11 gears measurement dish III with have 0, 1, 2, the 10 replacement dish III ' compositions of totally 11 gears, the 4th step disc is by having 0, 1, 2, 10 totally 11 gears measurement dish IV with have 0, 1, 2, the 10 replacement dish IV ' compositions of totally 11 gears, the 5th step disc is by having 0, 1, 2, 10 totally 11 gears measurement dish V with have 0, 1, 2, the 10 replacement dish V ' compositions of totally 11 gears, each contact in the 3rd step disc on measurement dish III and replacement dish III ', each contact in the 4th step disc on measurement dish IV and replacement dish IV ', each contact in the 5th step disc on measurement dish V and replacement dish V ', be connected the resistance R of 999.89 Ω for the second Metal Contact ring of step disc measurement dish II and the Metal Contact interannular of replacement dish II ' with the corresponding contact of replacement dish II ' with measurement dish II in the second step disc
1connect the resistance R of 9999.89 Ω for the 3rd Metal Contact ring of step disc measurement dish III and the Metal Contact interannular of replacement dish III '
2connect the resistance R of 100K Ω for the 4th Metal Contact ring of step disc measurement dish IV and the Metal Contact interannular of replacement dish IV '
3connect the resistance R of 1000K Ω for the 5th Metal Contact ring of step disc measurement dish V and the Metal Contact interannular of replacement dish V '
4connect, when the brush on each step disc measurement dish rotates with the brush on replacement dish, synchronize, " 0 " contact of measurement dish II is that node A connects measurement dish I " 0 " contact, and measurement dish I " 20 " contact is through the resistance R of 6.91 Ω
8after connected node C, connect again adjustable resistance R
p3cold end, another road of node C is through 101 Ω resistance R
6connect double-point double-throw switch K
1middle K
1-1layer × 0.1 range contact, double-point double-throw switch K
1middle K
1-1layer and K
1-2the normally closed contact of layer connects with wire, and " 10 " contact of replacement dish I ' is that Node B connects double-point double-throw switch K
1middle K
1-1layer × 1 range contact and K
1-2layer × 0.1 range contact, double-point double-throw switch K
1middle K
1-2layer × 0.1 range contact is through 818.1 Ω resistance R
7with K
1-2layer × 1 range contact connects, then sets up resistance R through 101.8 Ω
nrear connection temperature compensation dish W " 0 " contact temperature compensating disc W " 18 " contact connects the external working power E negative pole of pressure measuring instrument terminal, be used for connecting measured " U
x" two measure terminals, anodal terminal is connected with the Metal Contact ring of measurement dish I, negative pole terminal is through being connected to the double-point double-throw switch K of galvanometer G between two normally closed contacts
2be connected with " 10 " contact of measurement dish II afterwards.
By above technical scheme, between the 3rd, the 4th, the 5th step disc contact, all there is no resistance, and five step disc errors are independent, the error of the identical stepping of rear four dish is consistent, and this brings convenience to debugging and maintenance, also makes pressure measuring instrument simple in structure, volume-diminished, thus production cost reduced; In the time of five measurement dish resets of pressure measuring instrument, the internal wiring combined potential of pressure measuring instrument is A point current potential, some current potentials are " 0 ", so the zero potential of this pressure measuring instrument is very little, it is that in the voltage drop of unit, therefore thermoelectrical potential is to " U that the thermoelectrical potential of five several μ V of each branch road of step disc is all connected on to lie prostrate
x" two measure terminals impacts and can ignore.
Brief description of the drawings
Fig. 1 is a kind of schematic circuit of the present utility model.
In Fig. 1, the adjustable resistance R of 22 × 4 Ω
p1, represent adjustable resistance R
p1on have the series connection of resistance that 22 resistances are 4 Ω, in like manner, the adjustable resistance R of 22 × 0.2 Ω
p2, represent adjustable resistance R
p2on have the series connection of resistance that 22 resistances are 0.2 Ω, 20 × 0.1 Ω on the first step disc measurement dish I represent that measurement dish I has the resistance series connection that 20 resistances are 0.1 Ω,
10 × 0.01111 Ω on the second step disc measurement dish II and replacement dish II ', represent that measurement dish II has the resistance that 10 resistances are 0.01111 Ω to connect with on replacement dish II '.
In Fig. 1, 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
Embodiment 1, in Fig. 1, when in rear four step discs between node A, Node B, any one step disc rotates, the resistance that electric current flows through measurement dish to be increased equals electric current and flows through the resistance that replacement dish reduces, vice versa, so, what indicating value rear four step discs no matter put, and this step disc resistance value between node A and Node B is constant, and this can ensure rear four step discs no matter put what indicating value, each step disc resistance ratio is substantially constant, and the electric current of each step disc of also ensureing to flow through is substantially constant.
Pressure measuring instrument standard operation current design becomes 10mA, in the time of × 0.1 range, from node C through 6.91 Ω resistance R
8, five step discs are 909 Ω to Node B resistance, are connected to double-point double-throw switch K
1middle K
1-2layer × when 0.1 range contact, with 101 Ω resistance R
6parallel connection, 909 Ω resistances are 101 Ω resistance R
69 times of resistance, so flow through 101 Ω resistance R
6electric current be 9mA, the electric current that flows through five step discs is 1mA, with 101 Ω resistance R
6the resistance that makes circuit reduce after parallel connection, by the 818.1 Ω resistance R of connecting
7carry out the total resistance of holding circuit constant.
In the time of × 1 range, flowing through between node A and Node B is total working electric current 10mA.Pressure measuring instrument 10mA working current is divided into four tunnels after node A: a road is through measurement dish II, and a road is through measurement dish III, and a road is through measurement dish IV, and Zai Yi road is through measurement dish V, and four road electric currents meet at Node B.Each branch road resistance ratio between node A, Node B: the 5th step disc: the 4th stepping: the 3rd step disc: the second step disc=1000: 100: 10: 1, so, flowing through each branch current ratio between node A, Node B is: the 5th step disc: the 4th stepping: the 3rd step disc: the second step disc=1: 10: 100: 1000
When pressure measuring instrument 10mA electric current all flows through the upper some resistance of measurement dish II, the brush on measurement dish II, measurement dish III, measurement dish IV, measurement dish V is all put after this resistance, and this resistance is connecting measured " U
x" two magnitudes of voltage of measuring between terminals are 0.1111mV, at measured " U
x" two measure the two ends of terminal, the voltage added value of the every stepping of the second step disc is 1 × 10
-1mV, the voltage added value of the every stepping of the 3rd step disc is 1 × 10
-2mV, the voltage added value of the every stepping of the 4th step disc is 1 × 10
-3mV, the voltage added value of the every stepping of the 5th step disc is 1 × 10
-4mV.The each stepping of the first step disc is 1mV.In the time of × 0.1 range, flow through the electric current of five step discs little in the time of × 1 range 1/10, so when after working current standardization, the each stepping of the first step disc is 1 × 10
-1mV, the voltage added value of the every stepping of the second step disc is 1 × 10
-2mV, the voltage added value of the every stepping of the 3rd step disc is 1 × 10
-3mV, the voltage added value of the every stepping of the 4th step disc is 1 × 10
-4mV, the voltage added value of the every stepping of the 5th step disc is 1 × 10
-5mV.
In standard loop, the electromotive force of saturated standard cell is 1.0186V in the time of 20 DEG C of room temperatures, 1 DEG C of the every rising of environment temperature, the electromotive force of saturated standard cell reduces approximately 40 μ V, determines by the thermometer of 0.1 DEG C of resolution on saturated standard cell the electromotive force that saturated standard cell is instant.This pressure measuring instrument compensates temperature with the temperature compensation dish of every stepping 50 μ V.
Pressure measuring instrument working power will adopt YJ49 type high stability adjustable stabilized voltage supply, adjustable resistance R
p1, adjustable resistance R
p2, adjustable resistance R
p3be used for regulating working current, adjustable resistance R
p3all the resistance value of range of adjustment is greater than adjustable resistance R
p2a step value, adjustable resistance R
p2all the resistance value of range of adjustment is greater than adjustable resistance R
p1a step value, as long as YJ49 type high stability adjustable stabilized voltage supply output voltage is adjusted between 10.2～11V, just can conveniently pass through adjusting adjustable resistance R
p1, adjustable resistance R
p2, adjustable resistance R
p3pressure measuring instrument working current is adjusted to standard state.
Claims (1)
1. have a pressure measuring instrument for temperature compensation dish, from range of adjustment, the anodal terminal of the external working power E between 10.2～11V passes through by 22 adjustable resistance R that 4 Ω resistance are in series pressure measuring instrument
p1, by 22 adjustable resistance R that 0.2 Ω resistance is in series
p2, and the adjustable resistance R of range of adjustment between 0～0.22 Ω
p3, through five step discs, to 101.8 Ω set up resistance R
n, then through there being the temperature compensation dish W of 18 × 0.05 Ω resistance in seriess to get back to the external working power E negative pole terminal composition pressure measuring instrument work loop of range of adjustment between 10.2～11V above, from external saturated standard cell E
nanodal terminal is through being connected to the double-point double-throw switch K of galvanometer G between two normally closed contacts
2set up resistance R to 101.8 Ω
nget back to external saturated standard cell E through the temperature compensation dish W that has 18 × 0.05 Ω resistance in seriess above again
nnegative pole terminal composition pressure measuring instrument standard loop, be used for connecting measured " U
x" two terminals, anodal terminal is after five measurement dishes, then through being connected to the double-point double-throw switch K of galvanometer G between two normally closed contacts
2to negative pole terminal composition pressure measuring instrument equalizing network, it is characterized in that it have 0,1,2 ... the 18 temperature compensation dish W of totally 19 gears, weld one of 0.05 Ω resistance between every two adjacent contacts of temperature compensation dish W, temperature compensation dish W " 0 " contact 0.1 Ω resistance R in parallel with " 18 " two ends, contact
9, it separately has six step discs, and the first step disc is to have 0, 1, 2, the 20 measurement dish I of totally 21 gears, weld one of 0.1 Ω resistance between upper every two adjacent contacts of measurement dish I, and the second step disc is by having 0, 1, 2, 10 totally 11 gears measurement dish II with have 0, 1, 2, the 10 replacement dish II ' compositions of totally 11 gears, between upper every two adjacent contacts of measurement dish II and replacement dish II ', weld resistance and be one of the resistance of 0.1111 Ω, " 0 " contact of measurement dish II is circuit node A, " 10 " contact of replacement dish II ' is circuit node B, and the 3rd step disc is by having 0, 1, 2, 10 totally 11 gears measurement dish III with have 0, 1, 2, the 10 replacement dish III ' compositions of totally 11 gears, the 4th step disc is by having 0, 1, 2, 10 totally 11 gears measurement dish IV with have 0, 1, 2, the 10 replacement dish IV ' compositions of totally 11 gears, the 5th step disc is by having 0, 1, 2, 10 totally 11 gears measurement dish V with have 0, 1, 2, the 10 replacement dish V ' compositions of totally 11 gears, each contact in the 3rd step disc on measurement dish III and replacement dish III ', each contact in the 4th step disc on measurement dish IV and replacement dish IV ', each contact in the 5th step disc on measurement dish V and replacement dish V ', be connected the resistance R of 999.89 Ω for the second Metal Contact ring of step disc measurement dish II and the Metal Contact interannular of replacement dish II ' with the corresponding contact of replacement dish II ' with measurement dish II in the second step disc
1connect the resistance R of 9999.89 Ω for the 3rd Metal Contact ring of step disc measurement dish III and the Metal Contact interannular of replacement dish III '
2connect the resistance R of 100K Ω for the 4th Metal Contact ring of step disc measurement dish IV and the Metal Contact interannular of replacement dish IV '
3connect the resistance R of 1000K Ω for the 5th Metal Contact ring of step disc measurement dish V and the Metal Contact interannular of replacement dish V '
4connect, when the brush on each step disc measurement dish rotates with the brush on replacement dish, synchronize, " 0 " contact of measurement dish II is that node A connects measurement dish I " 0 " contact, and measurement dish I " 20 " contact is through the resistance R of 6.91 Ω
8after connected node C, connect again adjustable resistance R
p3cold end, another road of node C is through 101 Ω resistance R
6connect double-point double-throw switch K
1middle K
1-1layer × 0.1 range contact, double-point double-throw switch K
1middle K
1-1layer and K
1-2the normally closed contact of layer connects with wire, and " 10 " contact of replacement dish I ' is that Node B connects double-point double-throw switch K
1middle K
1-1layer × 1 range contact and K
1-2layer × 0.1 range contact, double-point double-throw switch K
1middle K
1-2layer × 0.1 range contact is through 818.1 Ω resistance R
7with K
1-2layer × 1 range contact connects, then sets up resistance R through 101.8 Ω
nrear connection temperature compensation dish W " 0 " contact temperature compensating disc W " 18 " contact connects the external working power E negative pole of pressure measuring instrument terminal, be used for connecting measured " U
x" two measure terminals, anodal terminal is connected with the Metal Contact ring of measurement dish I, negative pole terminal is through being connected to the double-point double-throw switch K of galvanometer G between two normally closed contacts
2be connected with " 10 " contact of measurement dish II afterwards.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420419425.1U CN204008799U (en) | 2014-07-24 | 2014-07-24 | There is the pressure measuring instrument of temperature compensation dish |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420419425.1U CN204008799U (en) | 2014-07-24 | 2014-07-24 | There is the pressure measuring instrument of temperature compensation dish |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204008799U true CN204008799U (en) | 2014-12-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420419425.1U Expired - Fee Related CN204008799U (en) | 2014-07-24 | 2014-07-24 | There is the pressure measuring instrument of temperature compensation dish |
Country Status (1)
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| CN (1) | CN204008799U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104101757A (en) * | 2014-07-24 | 2014-10-15 | 富阳兴远仪器仪表经营部 | Voltage measuring apparatus with temperature compensation plate |
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2014
- 2014-07-24 CN CN201420419425.1U patent/CN204008799U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104101757A (en) * | 2014-07-24 | 2014-10-15 | 富阳兴远仪器仪表经营部 | Voltage measuring apparatus with temperature compensation plate |
| CN104101757B (en) * | 2014-07-24 | 2017-01-11 | 富阳兴远仪器仪表经营部 | Voltage measuring apparatus with temperature compensation plate |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141210 Termination date: 20160724 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |