CN101788591B - Three-range DC potentiometer adopting slide wire disc - Google Patents

Three-range DC potentiometer adopting slide wire disc Download PDF

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Publication number
CN101788591B
CN101788591B CN200910259084XA CN200910259084A CN101788591B CN 101788591 B CN101788591 B CN 101788591B CN 200910259084X A CN200910259084X A CN 200910259084XA CN 200910259084 A CN200910259084 A CN 200910259084A CN 101788591 B CN101788591 B CN 101788591B
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resistance
contact
measuring disk
slide wire
range
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CN200910259084XA
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CN101788591A (en
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骆晓英
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Abstract

The invention relates to a multirange voltage measuring instrument for DC voltage measurement, comprising three stepping disks and a double-slide wire disk, wherein each disk forms a measuring disk and a replacing disk by resistors with same resistance values; and the three replacing disks is directly connected with one measuring slide wire disk through leads without switch switching. The voltage measuring instrument is not influenced by variations and thermoelectrical potentials when in use, obtains multiple range conversions by changing the size of working current and has the minimum resolution of 0.1 microvolt.

Description

There are three ranges to adopt the DC potentiometer of slide wire disc
Technical field
The present invention relates to measure the instrument of DC voltage.
Background technology
Application number 200510062264.3 and 200510062271.0 has been announced the DC potentiometer that three step discs and a slide wire disc are arranged, its second, the 3rd step disc respectively has measuring disk, replacement dish and bracket panel are formed, 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, because second step disc is declined when the 0th contact, the total resistance of circuit changed when the 3rd step disc was put different indicating value, second step disc is put when the 0th contact, it is constant that the 3rd step disc is put the total resistance of different indicating value circuit, second step disc removes for this reason measuring disk, outside the replacement dish, increase bracket panel and distinguished the circuit connection that second 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.Three measuring disk and a measuring disk slip are connected two and measure between terminals, brush on the step disc switch is got rid of measured outside the loop, do not exist switch to switch between the resistance on three measuring disk and the measuring disk slip, also just do not 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 that three measuring disk and a slide wire disc are arranged, contact resistance and variation that its measuring switch stepping is switched, the switch thermoelectrical potential does not influence measurement result; And three step discs and two slide wire discs are all without bracket panel.It also has three ranges, and minimum resolution is 0.1 μ V.
The technical scheme that the present invention uses is: DC potentiometer comprise electric current from the positive pole of 4.5V working power through by resistance, range selector K on three step discs and one pair of slide wire discs 1On the resistor network formed of resistance to 960 Ω fixed resistance R 0, 960 Ω fixed resistance R 0Connect 0～35000 Ω adjustable resistance R P1An end, adjustable resistance R P1Sliding contact connect～1400 Ω adjustable resistance R P2An end, adjustable resistance R P2Sliding contact connect 0～56 Ω adjustable resistance R P3An end, adjustable resistance R P3Sliding contact and adjustable resistance R P3, adjustable resistance R P2, adjustable resistance R P1The other end be connected in parallel on the working power negative pole, form DC potentiometer work loop; From standard cell E NAnodal 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 NAnd lockable adjustable resistance, form the DC potentiometer standard loop that three ranges are arranged to the standard cell negative pole again; Be used to connect measured " U X" two terminals, behind the resistor network of anodal terminal through three measuring disk, a measuring disk slip, again through being connected to the double-point double-throw switch K of galvanometer G between two normally closed contacts 2Form the DC potentiometer equalizing network that three ranges are arranged to the negative pole terminal; First step disc is that I measuring disk and the I ' replacement dish that 1000/11sts Ω resistance are formed formed by 20 resistances are respectively arranged, second step disc is made up of each II measuring disk and the II ' replacement dish of being made up of 10 11 Ω resistance, and the brush of the brush of measuring disk and replacement dish is through 22 Ω resistance R on second step disc 2Connect, the 3rd step disc is made up of each III measuring disk and the III ' replacement dish of being made up of 10 11 Ω resistance, 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 of this pair slide wire disc all are 0～10 Ω, be that top is 0 Ω, end is 10 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 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 dish brush connects DC potentiometer working power positive pole, 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 III ' replacement and coil the 10th contact, III measuring disk the 0th contact connects II measuring disk the 10th contact, and II measuring disk the 0th contact is 1901/11sts Ω resistance R through a resistance 1The back is connected with I measuring disk the 0th contact, and it is 213200/11sts Ω resistance R through a resistance that the 0th contact is coiled in the I ' replacement 3The back is connected with the IV ' replacement dish slip the 0th contact, and IV measuring disk slip the 10th contact is connected with I measuring disk the 20th contact; I measuring disk brush connects DPTT double-pole triple throw range selector K 1K 1-2The normally closed contact of layer, K 1-2Layer * 0.2 range contact and * 1 range contact between by 37049 Ω setting resistance R N3And 0～55 Ω adjustable resistance R P4Connect K 1-2Layer * 1 range contact and * 10 range contacts between by 8334 Ω setting resistance R N2And 0～10 Ω adjustable resistance R P5Connect K 1-2Layer * 10 range contacts and DPTT double-pole triple throw range selector K 1K 1-1Set up resistance R by 926 Ω between the normally closed contact of layer N1And 0～2 Ω adjustable resistance R P6Connect K 1-1The normally closed contact of layer connects standard cell E NNegative pole, K 1-1Layer * 960 Ω fixed resistance R are passed through in 10 range contacts 0To the working power negative pole, K 1-1Layer * 10 range contact and K 1-1Layer * 1 range contact between by 26000 Ω fixed resistance R aConnect K 1-1Layer * 1 range contact and K 1-1Layer * 0.2 range contact between by 116000 Ω fixed resistance R bConnect standard cell E NAnodal through being connected to the double-point double-throw switch K of galvanometer G between two normally closed contacts 2With K 1-2The normally closed contact of layer connects, " the U that DC potentiometer is used to measure X" two terminals, anodal terminal is connected with III measuring disk the 10th contact, and the negative pole terminal is through being connected to the double-point double-throw switch K of galvanometer G between two normally closed contacts 2The back is connected with IV measuring disk slip 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 kind of schematic circuit of the present invention.
In Fig. 1, the I measuring disk of 20 * 1000/11 Ω and the I ' replacement dish, each is I measuring disk and the I ' replacement dishes that 1000/11sts Ω resistance are formed by 20 resistances for expression, in like manner, 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 1.4V was following, electric current was stable inadequately with the electromotive force of No. 1 battery for working power, and the electromotive force of new battery reaches 1.65V, and No. 1 dry cells of 3 groups of series connection can be used as between the cell emf 4.2～4.95V of working power standard cell E NElectromotive force between 1.0188～1.0196V, during * 10 ranges, set up resistance R by 926 Ω N1, calibration 0～2 Ω adjustable resistance R P6Make working current equal 1.1mA; During * 1 range, seal in 26000 Ω fixed resistance R again a, regulate adjustable resistance R P1, adjustable resistance R P2, adjustable resistance R P3Make the total resistance in work loop between 38000～45000 Ω, set up resistance R by 8334 Ω N2, calibration adjustable resistance R P5Make working current equal 0.11mA, during * 0.2 range, seal in 116000 Ω fixed resistance R again b, regulate adjustable resistance R P1, regulate adjustable resistance R P2, adjustable resistance R P3The work loop is always hindered between 191000～226300 Ω, set up resistance R by 37049 Ω N3, calibration adjustable resistance R P4Make working current equal 0.022mA.
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 22 Ω resistance R 2, to the contact that contact with II measuring disk brush, this roadlock value is 22 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 220 Ω, therefore, 22 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 thrown n 1, the II measuring disk is thrown n 2, the III measuring disk is thrown n 3, two slide wire discs are thrown n 4(n is certain big lattice indicating value), K switch 2Throw to the left side, be positioned at this moment that voltage is between two terminals of measurement:
U X＝1/11×11n 3+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 4)×1
＝n 3+10+10n 2+1901/11+1000n 1/11-2000/11+100n 1/11-1+0.1n 4
＝1000n 1/11+100n 1/11+10n 2+n 3+0.1n 4+10+1901/11-2000/11-1(mV)
＝100n 1+10n 2+n 3+0.1n 4(mV)
More than be * indicating value of three step discs and two slide wire discs during 10 ranges,
When * 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)
When * 0.2 range, the indicating value of three step discs and two slide wire discs is expressed as 2n 1+ 0.2n 2+ 0.02n 3+ 0.002n 4(mv)
The standard operation electric current is to determine like this: 2mV standard signal voltage is pressed polarity and DC potentiometer " U x" two measure terminal and connect DC potentiometer range switch K 1Put " * 10 " range, it is identical with the standard signal magnitude of voltage that each coils total indicating value, double-point double-throw switch K 2Throw to the left side adjustable resistance R P1Adjustable resistance R is regulated in reset P2And adjustable resistance R P3, make galvanometer G nulling; Again with double-point double-throw switch K 2Throw to the right, regulate adjustable resistance R P6, make galvanometer G nulling, at this moment adjustable resistance R P6Locking; Again range switch K 1Put " * 1 " range, 200mV standard signal voltage is pressed polarity and DC potentiometer " U x" two measure terminal and connect, it is identical with the standard signal magnitude of voltage that each coils total indicating value, double-point double-throw switch K 2Throw to the left side, regulate adjustable resistance R P1, adjustable resistance R P2And adjustable resistance R P3, make galvanometer G nulling; Again with double-point double-throw switch K 2Throw to the right, regulate adjustable resistance R P5, make galvanometer G nulling, at this moment adjustable resistance R P5Locking; Again range switch K 1Put " * 0.2 " range, 40mV standard signal voltage is pressed polarity and DC potentiometer " U x" two measure terminal and connect, it is identical with the standard signal magnitude of voltage that each coils total indicating value, double-point double-throw switch K 2Throw to the left side, regulate adjustable resistance R P1, adjustable resistance R P2And adjustable resistance R P3, make galvanometer G nulling; Again with double-point double-throw switch K 2Throw to the right, regulate adjustable resistance R P4, make galvanometer G nulling, at this moment adjustable resistance R P4Locking; When using from now on, DC potentiometer is standard according to this.

Claims (1)

1. DC potentiometer that has three ranges to adopt slide wire discs, it comprise electric current from the positive pole of 4.5V working power through by resistance, range selector K on three step discs and one pair of slide wire discs 1On the resistor network formed of resistance to 960 Ω fixed resistance R 0, 960 Ω fixed resistance R 0Connect 0～35000 Ω adjustable resistance R P1An end, adjustable resistance R P1Sliding contact connect 0～1400 Ω adjustable resistance R P2An end, adjustable resistance R P2Sliding contact connect 0～56 Ω adjustable resistance R P3An end, adjustable resistance R P3Sliding contact and adjustable resistance R P3, adjustable resistance R P2, adjustable resistance R P1The other end be connected in parallel on the working power negative pole, form DC potentiometer work loop; From standard cell E NAnodal 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 NAnd lockable adjustable resistance, form the DC potentiometer standard loop that three ranges are arranged to the standard cell negative pole again; Be used to connect measured " U X" two terminals, behind the resistor network of anodal terminal through three measuring disk, a measuring disk slip, again through being connected to the double-point double-throw switch K of galvanometer G between two normally closed contacts 2Form the DC potentiometer equalizing network that three ranges are arranged to the negative pole terminal; It is characterized in that first step disc is that I measuring disk and the I ' replacement dish that 1000/11sts Ω resistance are formed formed by 20 resistances are respectively arranged, second step disc is made up of each II measuring disk and the II ' replacement dish of being made up of 10 11 Ω resistance, and the brush of the brush of measuring disk and replacement dish is through 22 Ω resistance R on second step disc 2Connect, the 3rd step disc is made up of each III measuring disk and the III ' replacement dish of being made up of 10 11 Ω resistance, 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 of this pair slide wire disc all are 0～10 Ω, be that top is 0 Ω, end is 10 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 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 dish brush connects DC potentiometer working power positive pole, 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 III ' replacement and coil the 10th contact, III measuring disk the 0th contact connects II measuring disk the 10th contact, and II measuring disk the 0th contact is 1901/11sts Ω resistance R through a resistance 1The back is connected with I measuring disk the 0th contact, and it is 213200/11sts Ω resistance R through a resistance that the 0th contact is coiled in the I ' replacement 3The back is connected with the IV ' replacement dish slip the 0th contact, and IV measuring disk slip the 10th contact is connected with I measuring disk the 20th contact; I measuring disk brush connects DPTT double-pole triple throw range selector K 1K 1-2The normally closed contact of layer, K 1-2Layer * 0.2 range contact and * 1 range contact between by 37049 Ω setting resistance R N3And 0～55 Ω adjustable resistance R P4Connect K 1-2Layer * 1 range contact and * 10 range contacts between by 8334 Ω setting resistance R N2And 0～10 Ω adjustable resistance R P5Connect K 1-2Layer * 10 range contacts and DPTT double-pole triple throw range selector K 1K 1-1Set up resistance R by 926 Ω between the normally closed contact of layer N1And 0～2 Ω adjustable resistance R P6Connect K 1-1The normally closed contact of layer connects standard cell E NNegative pole, K 1-1Layer * 960 Ω fixed resistance R are passed through in 10 range contacts 0To the working power negative pole, K 1-1Layer * 10 range contact and K 1-1Layer * 1 range contact between by 26000 Ω fixed resistance R aConnect K 1-1Layer * 1 range contact and K 1-1Layer * 0.2 range contact between by 116000 Ω fixed resistance R bConnect standard cell E NAnodal through being connected to the double-point double-throw switch K of galvanometer G between two normally closed contacts 2With K 1-2The normally closed contact of layer connects, " the U that DC potentiometer is used to measure X" two terminals, anodal terminal is connected with III measuring disk the 10th contact, and the negative pole terminal is through being connected to the double-point double-throw switch K of galvanometer G between two normally closed contacts 2The back is connected with IV measuring disk slip the 0th contact.
CN200910259084XA 2008-08-28 2008-08-28 Three-range DC potentiometer adopting slide wire disc Expired - Fee Related CN101788591B (en)

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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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CN101788591B true CN101788591B (en) 2011-08-24

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1793983A (en) * 2005-12-28 2006-06-28 骆乃光 Three measuring range potential difference meter using slide wire disc having five digit reading
CN1793965A (en) * 2005-12-28 2006-06-28 骆乃光 Three measuring range direct current potential difference meter having five digit reading using divided branch
CN101029909A (en) * 2007-04-03 2007-09-05 方勇 DC two-measurement range potential difference meter

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1793983A (en) * 2005-12-28 2006-06-28 骆乃光 Three measuring range potential difference meter using slide wire disc having five digit reading
CN1793965A (en) * 2005-12-28 2006-06-28 骆乃光 Three measuring range direct current potential difference meter having five digit reading using divided branch
CN101029909A (en) * 2007-04-03 2007-09-05 方勇 DC two-measurement range potential difference meter

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