CN101813721B - Pressure measuring instrument - Google Patents

Pressure measuring instrument Download PDF

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Publication number
CN101813721B
CN101813721B CN2009102590765A CN200910259076A CN101813721B CN 101813721 B CN101813721 B CN 101813721B CN 2009102590765 A CN2009102590765 A CN 2009102590765A CN 200910259076 A CN200910259076 A CN 200910259076A CN 101813721 B CN101813721 B CN 101813721B
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China
Prior art keywords
contact
resistance
measuring disk
replacement
slide wire
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Expired - Fee Related
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CN2009102590765A
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Chinese (zh)
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CN101813721A (en
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骆晓英
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Individual
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Individual
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Abstract

The invention relates to a pressure measuring instrument for the measurement of direct current voltage, which has two measuring ranges and comprises three stepping disks and a slide wire disk. Three measuring disks are directly connected with a slide wire of a measuring disk by leads without switch switching, therefore, the pressure measuring instrument does not have variation and thermoelectrical potential influence during measurement; and all the disks form measuring disks and a replacing disk by resistors with same resistance values without an auxiliary disk so that the volume of the whole instrument is shortened.

Description

DC potentiometer
This case is an invention with on August 28th, 2008 application, application number 200810120442.4, and to be " DC potentiometer that adopts slide wire disc " divide an application for of female case title.
Technical field
The present invention relates to instrument that DC voltage is measured.
Background technology
Application number 2005100623569,2005100622674,2005100622903 etc. discloses three step discs, the DC potentiometer of two slide wire discs, each is made up of its second, third step disc measuring disk, replacement dish and bracket panel, measuring disk is identical with resistance on the replacement dish, resistance of the every increase of measuring disk, the replacement dish just reduces same resistance, when second step disc is put the 0th contact, second step disc equates with the 3rd step disc part resistance in parallel, when the 3rd step disc was put different indicating value, the circuit resistance was constant.When second step disc is declined when " 0 ", the 3rd step disc is put different indicating values, the circuit resistance is not having III " resistance changes during bracket panel; stepping of the every increase of the 3rd step disc, circuit resistance can increase half resistance of each stepping resistance, for the total resistance of holding circuit constant; at III " each stepping of bracket panel reduces same resistance, at this moment resistance minimum when second step disc is put the 0th contact allows III " bracket panel resistance all seals in circuit, makes the circuit resistance constant.Because first step disc and two slide wire disc are formed by resistance identical measuring disk and replacement dish, so what indicating value no matter four dishes put, circuit always hinders constant.Second step disc is except that having measuring disk, replacement dish for this reason, increase bracket panel and distinguished the circuit connection that step disc is put the 0th contact and declined the two kinds of situations in the 0th contact, the 3rd step disc has also increased bracket panel, has 10 resistance to insert or cut out several resistance respectively above and makes the total resistance of circuit constant.Four measurement disks is connected two and measures between terminal, and the brush on the step disc switch is got rid of outside the measurement loop, does not exist switch to switch between the resistance on the four measurement disks, does not also just produce variation; The thermoelectrical potential that has also solved switch with contact variable thermoelectric potential influence.
Because second, third step disc all has bracket panel, increased the number of plies of second, third step disc switch, thereby increased the volume of instrument, also make switch and apparatus structure become complicated, if find in the instrument verification process that particularly second, third step disc measurement data is overproof, the internal layer resistance that revise second, third step disc switch bothers very much.
Summary of the invention
The objective of the invention is to design a kind of DC potentiometer, do not switch by switch in the connection of four measurement disks, three step discs, two slide wire discs are all cancelled bracket panel, and the volume that this can reduce instrument reduces production costs.
Technical scheme of the present invention is taked like this:
Electric current is set up resistance R N and range of adjustment adjustable resistance RP at 0～2 Ω through the resistor network on three step discs, the two slide wire disc to 926 Ω from the positive pole of DC potentiometer 4.5V working power 3, again to 190 Ω fixed resistance R 0, through the adjustable resistance R of 0～35 Ω P2And the adjustable resistance P of 22 * 30 Ω R1The negative pole of getting back to working power is formed the work loop of DC potentiometer; From standard cell EN positive pole through being connected to the double-point double-throw switch K of galvanometer G between two normally closed contacts 2, to setting up resistance R N and lockable adjustable resistance R P3, arrive the standard loop that the standard cell negative pole is formed DC potentiometer again; DC potentiometer is used to connect measured " U X" two terminals, behind the resistor network of anodal terminal, again through being connected to the double-point double-throw switch K of galvanometer G between two normally closed contacts through three measuring disk, a measuring disk slip 2The equalizing network of forming DC potentiometer to the negative pole terminal; It is characterized in that first step disc is made up of I measuring disk that 20 * 1000/11 Ω are respectively arranged and the I ' replacement dish, second step disc is made up of II measuring disk that 10 * 11 Ω are respectively arranged and the II ' replacement dish, and the brush of the brush of measuring disk and replacement dish is through 12.1 Ω resistance R on second step disc 2Connect, the 3rd step disc is made up of III measuring disk that 10 * 10 Ω are respectively arranged and the III ' replacement dish, the brush of measuring disk is connected through lead with the brush of replacement dish on the 3rd step disc, the 4th dish is two slide wire discs, two slide wire resistance Standard resistance ranges all are 0～11 Ω, be that top is 0 Ω, end is 11 Ω, wherein one is IV measuring disk slip, another root is an IV ' replacement dish slip, the index dial of two slide wire discs indicates 0,1,2,10 big lattice of 100 one indicating value points, every big lattice are not marked numeral equally distributed 10 little lattice, the corresponding resistance of every big lattice is 1.1 Ω, " 0 " indicating value of two slide wire disc index dials, dish slip of the IV ' replacement just and IV measuring disk slip the 0th contact, top on the i.e. brush of the two slide wire discs contact slide wire resistance, the index dial of two slide wire discs " 10 " indicating value, dish slip of the IV ' replacement just and IV measuring disk slip the 10th contact, i.e. end on the brush of the two slide wire discs contact slide wire resistance; Brush on two slide wire resistances is with a slice sheet metal; The I ' replacement is coiled the 20th contact and is connected the II ' replacement and coil the 10th contact, the II ' replacement is coiled the 0th contact and is connected the IV ' replacement dish slip the 10th contact, IV measuring disk slip the 0th contact connects II measuring disk the 10th contact, and II measuring disk the 0th contact is through one 2000/11 Ω resistance R 1The back is connected with I measuring disk the 0th contact, and the I ' replacement is coiled the 0th contact through one 212210/11 Ω resistance R 3The back is coiled the 0th contact with the III ' replacement and is connected, and III measuring disk the 10th contact is connected with I measuring disk the 20th contact; The I ' replacement dish brush is through 8490/11 Ω resistance R 4Back and 300 Ω resistance r 1Be connected in parallel on DC potentiometer working power positive pole, resistance r 1The other end connect range selector K 1K 1-1Layer * 0.1 range contact, range selector K 1K 1-2Layer * 0.1 range contact and I measuring disk brush all with range selector K 1K 1-1Layer * 1 range contact connects 2430 Ω resistance r 2One end connects range selector K 1-2Layer * 0.1 range contact, the other end connects range selector K 1-2Layer * 1 range contact, K 1-2Layer * 1 range contact is connected on the hot end of setting up resistance R N, range selector K again 1K 1-1Layer and K 1-2Two normally closed contact short circuits of layer, DC potentiometer is used to connect measured " U X" two terminals, anodal terminal is connected with IV measuring disk slip the 10th contact, the 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 III measuring disk the 0th contact.
By above technical scheme, three step discs and two slide wire discs are all without bracket panel, and this makes DC potentiometer simple in structure, and volume-diminished, whole instrument overall dimensions reduce many, have also reduced production cost; The measuring disk that instrument is used for measure portion connects with lead, contact resistance and variation be not in equalizing network, the just DC potentiometer work loop of influence always hinders, because total resistance resistance is very big, so variation can be ignored, the thermoelectric potential influence of several μ V be supply voltage, therefore influence can be ignored, zero potential can increase between I measuring disk and the right measuring disk lead resistance greatly to be revised, and the zero potential I increases between I measuring disk and the left side measuring disk lead resistance and revises.
Description of drawings
Fig. 1 is a schematic circuit of the present invention.
In Fig. 1,22 * 30 Ω adjustable resistances resistance R P1, expression adjustable resistance resistance R P1Hindered by 22 30 Ω resistance, in like manner, it is that 1000/11 Ω resistance is formed that 20 * 1000/11 Ω represent by 20 resistances, and 10 * 11 Ω represent to be made up of 10 11 Ω resistance.
Embodiment
In Fig. 1, when two slide wire discs of three step discs and all during reset, left side resistance equals 2121 Ω between two brushes of first step disc, and the right resistance equals 21210 Ω, therefore 10/11 on the left side of total current flows between two brushes of first step disc, and 1/11 flows on the right.When the two slide wire discs of three step discs and were put other indicating value, the resistance that measuring disk increases equaled the resistance that the replacement dish reduces, so what indicating value no matter three step discs put with one pair of slide wire discs, circuit always hinders constant.
When * 0.1 range, all-in resistance is 21210/11 Ω between two brushes of first step disc, adds 8490/11 Ω resistance R 4, totally 2700 Ω, resistance is the resistance r of 300 Ω 1And resistance adds resistance R between two brushes 4Parallel connection is reduced to * 1/10 during 1 range the electric current that flows through between two brushes of first step disc, and then the amount limit is reduced to * 1/10 during 1 range, resistance r 1With resistance value is reduced after two brushes are in parallel, therefore in the DC potentiometer circuit, seal in resistance r 2Keep all-in resistance constant.
DC potentiometer standard operation electric current is 1.1mA, left side electric current 1mA between two brushes of first step disc, the right electric current 0.1mA, left side electric current is divided into two branch roads after flowing to the contact that contacts with the II ' replacement dish brush, and one the tunnel through the II ' replacement dish brush, resistance 12.1 Ω resistance R 2, to the contact that contact with II measuring disk brush, this roadlock value is 12.1 Ω, the contact that contacts with II measuring disk brush is arrived after through two slide wire discs in another road, this roadlock value is 121 Ω, therefore, 12.1 Ω resistance R 2On electric current be 10/11mA, the electric current on two slide wire discs is 1/11mA.
After the working current standardization, the I measuring disk is put n 1, the II measuring disk is put n 2, the III measuring disk is put n 3, two slide wire discs are put n 4(n is certain big lattice indicating value), double-point double-throw switch K 2Throw to the left side, be positioned at this moment that voltage is between two terminals of measurement:
U X＝1/11×1.1n 4+1/11×110+10/11×11n 2+1×R 1+1×1000n 1/11-0.1×(20-n 1)×1000/11-0.1(10-n 3)×10 (mV)
＝0.1n 4+10+10n 2+2000/11+1000n 1/11-2000/11+100n 1/11-10+n 3(mV)
＝1000n 1/11+100n 1/11+10n 2+n 3+0.1n 4+10+2000/11-2000/11-10(mV)
＝100n 1+10n 2+n 3+0.1n 4(mV)
More than be * indicating value during 1 range,
When * 0.1 range, the indicating value of three step discs and two slide wire discs is expressed as 10n 1+ n 2+ 0.1n 3+ 0.01n 4(mv)
Internal attachment standard is calibration like this: at " U x" two of two ends measure terminals and connect 2V normal voltage signal, double-point double-throw switch K by polarity 2Throw to the left side, the measuring disk indicating value is identical with standard voltage value, regulates resistance R by regulating working current P1And P R2, make the galvanometer nulling, again with double-point double-throw switch K 2Throw to the right, the electromotive force of unsaturated standard cell disperses when dispatching from the factory in factory, and between 1.0188～1.0196V, sampling is 926 Ω with the resistance of setting up resistance R N, and 0～2 Ω adjustable resistance R has connected P3, regulate adjustable resistance R P3, make galvanometer nulling once more, again with double-point double-throw switch K 2Throw to the left side, regulate adjustable resistance R P2, make the galvanometer nulling, again with double-point double-throw switch K 2Throw to the right, regulate adjustable resistance R P3, make the galvanometer nulling, as double-point double-throw switch K 2Throw to the left side and throw to the right and do not regulate, during the equal nulling of galvanometer, the working current standardization of DC potentiometer is described, promptly set up ohmically pressure drop and equate, at this moment with adjustable resistance R with the electromotive force of unsaturated standard cell EN P3Locking, this DC potentiometer is from now on just as standard.
The DC potentiometer operating voltage is 1.5V, because the every joint stable electrical of dry cell kinetic potential between 1.4V～1.65V, all can be adjusted to standard state to the DC potentiometer working current for realizing supply voltage at 4.2V～4.95V, gets fixed resistance R 0=190 Ω, adjustable resistance R P1=22 * 30 Ω, adjustable resistance R P2Range of adjustment is between 0～35 Ω.

Claims (1)

1. DC potentiometer, electric current is set up resistance R N and range of adjustment adjustable resistance RP at 0～2 Ω through the resistor network on three step discs, the two slide wire disc to 926 Ω from the positive pole of DC potentiometer 4.5V working power 3, again to 190 Ω fixed resistance R 0, through the adjustable resistance R of 0～35 Ω P2And the adjustable resistance R of 22 * 30 Ω P1The negative pole of getting back to working power is formed the work loop of DC potentiometer; From standard cell EN positive pole through being connected to the double-point double-throw switch K of galvanometer G between two normally closed contacts 2, to setting up resistance R N and lockable adjustable resistance R P3, arrive the standard loop that the standard cell negative pole is formed DC potentiometer again; DC potentiometer is used to connect measured " U X" two terminals, behind the resistor network of anodal terminal, again through being connected to the double-point double-throw switch K of galvanometer G between two normally closed contacts through three measuring disk, a measuring disk slip 2The equalizing network of forming DC potentiometer to the negative pole terminal; It is characterized in that first step disc is made up of I measuring disk that 20 * 1000/11 Ω are respectively arranged and the I ' replacement dish, second step disc is made up of II measuring disk that 10 * 11 Ω are respectively arranged and the II ' replacement dish, and the brush of the brush of measuring disk and replacement dish is through 12.1 Ω resistance R on second step disc 2Connect, the 3rd step disc is made up of III measuring disk that 10 * 10 Ω are respectively arranged and the III ' replacement dish, the brush of measuring disk is connected through lead with the brush of replacement dish on the 3rd step disc, the 4th dish is two slide wire discs, two slide wire resistance Standard resistance ranges all are 0～11 Ω, be that top is 0 Ω, end is 11 Ω, wherein one is IV measuring disk slip, another root is an IV ' replacement dish slip, the index dial of two slide wire discs indicates 0,1,2,10 big lattice of 100 one indicating value points, every big lattice are not marked numeral equally distributed 10 little lattice, the corresponding resistance of every big lattice is 1.1 Ω, " 0 " indicating value of two slide wire disc index dials, dish slip of the IV ' replacement just and IV measuring disk slip the 0th contact, top on the i.e. brush of the two slide wire discs contact slide wire resistance, the index dial of two slide wire discs " 10 " indicating value, dish slip of the IV ' replacement just and IV measuring disk slip the 10th contact, i.e. end on the brush of the two slide wire discs contact slide wire resistance; Brush on two slide wire resistances is with a slice sheet metal; The I ' replacement is coiled the 20th contact and is connected the II ' replacement and coil the 10th contact, the II ' replacement is coiled the 0th contact and is connected the IV ' replacement dish slip the 10th contact, IV measuring disk slip the 0th contact connects II measuring disk the 10th contact, and II measuring disk the 0th contact is through one 2000/11 Ω resistance R 1The back is connected with I measuring disk the 0th contact, and the I ' replacement is coiled the 0th contact through one 212210/11 Ω resistance R 3The back is coiled the 0th contact with the III ' replacement and is connected, and III measuring disk the 10th contact is connected with I measuring disk the 20th contact; The I ' replacement dish brush is through 8490/11 Ω resistance R 4Back and 300 Ω resistance r 1Be connected in parallel on DC potentiometer working power positive pole, resistance r 1The other end connect range selector K 1K 1-1Layer * 0.1 range contact, range selector K 1K 1-2Layer * 0.1 range contact and I measuring disk brush all with range selector K 1K 1-1Layer * 1 range contact connects 2430 Ω resistance r 2One end connects range selector K 1-2Layer * 0.1 range contact, the other end connects range selector K 1-2Layer * 1 range contact, K 1-2Layer * 1 range contact is connected on the hot end of setting up resistance R N, range selector K again 1K 1-1Layer and K 1-2Two normally closed contact short circuits of layer, DC potentiometer is used to connect measured " U X" two terminals, anodal terminal is connected with IV measuring disk slip the 10th contact, the 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 III measuring disk the 0th contact.
CN2009102590765A 2008-08-28 2008-08-28 Pressure measuring instrument Expired - Fee Related CN101813721B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
CN2009102590765A CN101813721B (en) 2008-08-28 2008-08-28 Pressure measuring instrument

Related Parent Applications (1)

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CN2008101204424A Division CN101354410B (en) 2008-08-28 2008-08-28 DC potential difference meter using slide wire tray

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CN101813721B true CN101813721B (en) 2011-08-10

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Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104237594B (en) * 2014-09-22 2017-02-01 富阳精密仪器厂 Single-arm and double-arm bridge
CN104198792B (en) * 2014-09-22 2017-01-18 富阳精密仪器厂 Double-arm bridge

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0903585A2 (en) * 1997-09-18 1999-03-24 Fluke Corporation Input ranging circuit for an electronic instrument
CN1818676A (en) * 2005-12-30 2006-08-16 骆乃光 Single-measuring range potential difference meter with five reading digits

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0903585A2 (en) * 1997-09-18 1999-03-24 Fluke Corporation Input ranging circuit for an electronic instrument
CN1818676A (en) * 2005-12-30 2006-08-16 骆乃光 Single-measuring range potential difference meter with five reading digits

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