CN2042601U - Dc digital electricity measuring instrument for electric prospecting - Google Patents
Dc digital electricity measuring instrument for electric prospecting Download PDFInfo
- Publication number
- CN2042601U CN2042601U CN 88213424 CN88213424U CN2042601U CN 2042601 U CN2042601 U CN 2042601U CN 88213424 CN88213424 CN 88213424 CN 88213424 U CN88213424 U CN 88213424U CN 2042601 U CN2042601 U CN 2042601U
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- digital
- utility
- model
- electric
- high resistance
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Abstract
The utility model relates to a DC digital electricity measuring instrument for electric prospecting. The utility model is composed of a same-phase follower and a same-phase amplifier which are composed of high resistance operation amplifiers, an adjustable alternating current filter, a sampling holder, a negative-pressure converter, a digital liquid crystal display voltmeter, etc. The DC digital electricity measuring instrument can realize the functions of self-electricity automatic compensation, sampling holding, liquid crystal digital display, adjustable anti-alternating current interference, etc. The resolution of the utility model is 10V / word, the weight of the utility model is only 2.5 kg, and the power of the utility model is less than 40m W. The utility model has the advantages of high measuring precision, simple structure, small size convenient operation, high work efficiency, etc. The utility model is suitable for the metal mine surveying, a natural electric-field method, a resistivity method and a charging method for the geophysical prospecting of the hydrology engineering geology and a city, etc.
Description
The utility model relates to a kind of geophysical instrument, is applicable to the natural electric field method in the D.C. method, and methods such as resistivity method and mise-a-la-masse method can be used for the metallic ore generaI investigation, hydrological engineering geology and city physical prospecting work.
At present, domestic direct current electric pilot commonly used is the DDC-2 electron automatic compensator, and it is to adopt vacuum tube circuit, its shortcoming is complex structure, dial plate reading, manual adjustments, poor stability, measuring accuracy is low, poor anti jamming capability, signal to noise ratio (S/N ratio) is low, weight, volume, power consumption are all big, and working power benzene is heavy, and labour intensity is big, the job costs height, efficient is low.
The purpose of this utility model is to provide a kind of DC digital electric pilot, and it is simple in structure, and numeral shows, compensates spontaneous potential automatically, the measuring accuracy height, and antijamming capability is strong, and the signal to noise ratio (S/N ratio) height is small-sized, light, low-power consumption, job costs are low, the efficient height.
The utility model adopts CMOS little power consumption A/D converter of large scale integrated circuit 7126 types and liquid crystal digital display combination, realize that d. c. voltage signal measurement high accuracy number shows, utilize the combination of high resistance operating amplifier and quality capacitance, realize spontaneous potential compensation and measurement electric current automatically, the magnitude of voltage sampling keeps function, utilize negative pressure converter ic 7660+6V power source conversion one-tenth-6V, can provide to high resistance operating amplifier ± the 6V bi-directional power, save used heavy power supply of benzene and the corresponding electronic component of instrument in the past, with the joint number of switch control low-pass filter, to change to exchanging the damping capacity and the time of reading establishment constant RC of undesired signal.
Fig. 1 spontaneous potential auto compensatng circuit
Fig. 2 sampling hold circuit
Fig. 3 DC digital electric pilot circuitry figure
Be described with reference to the accompanying drawings structure of the present utility model and principle of work.
Fig. 1 utilizes high resistance operating amplifier and high-quality capacitor to combine, and realizes that spontaneous potential compensates automatically.High resistance operating amplifier is connected into homophase when importing amiable in-phase amplifier, has high input impedance, and its value is 10
12Ohm, can regard voltage-controlled original paper as, be that the in-phase input end no current flows into, if it is connected in the circuit-under-test, circuit-under-test will there be influence, if input voltage Vi is from potential electrode MN, connect the switch ground connection of capacitor C, before not adding artificial electric field, Vi is the spontaneous potential value of the earth, and the electric capacity two ends will charge to the Vi value, when the switch that connects electric capacity is transferred the high resistance operating amplifier in-phase end, capacitor C is serially connected with in-phase input end, and capacitance voltage V1 equates that with potential electrode MN input end Vi numerical value direction is opposite, cancel out each other, making between high resistance operating amplifier in-phase end and the ground voltage is zero, thereby reaches the purpose of eliminating spontaneous potential, for this reason, require the sustaining voltage of capacitor C own constant, and because the high input impedance of high resistance operating amplifier, capacitor C can be by its discharge, the output voltage V of high resistance operating amplifier yet
0Identical with the voltage of input end, and be Low ESR output can not change the input circuit state for measuring.
Fig. 2 sampling hold circuit, when K switch was connected, capacitor C charged to potential electrode MN input voltage Vi, be sample states this moment, and when K switch disconnected, the capacitor C both end voltage kept the Vi value, output also keeps the Vi value, along with the connecting and disconnecting of K switch, finishes sampling and keeps function.Sampling and maintenance to supply current, be to make supply current flow through 0.1 ohm of measuring resistance, producing the magnitude of voltage that is directly proportional with electric current fills in capacitor C, then with the in-phase end and ground end of switch with capacitor C two ends switching high resistance operating amplifier, finish maintenance, measure the output voltage values of high resistance operating amplifier, finish sampling electric current.
Fig. 3 is circuitry figure of the present utility model, is by alternating current filter 1, input voltage △ V
MNSampling holder 2, spontaneous potential automatic compensator 3, self-correcting voltage signal generator 4, supply current sampling holder 5, the homophase that high resistance operating amplifier is formed is followed and in-phase amplifier 6, and negative pressure converter 7 and 3 1/2 liquid crystal display digital voltmeters 8 are formed.From the direct current of potential electrode MN with exchange mixed signal, by alternating current filter 1 AC signal being decayed to does not have effect to apparatus measures, its damping capacity can be chosen by switch control, and unattenuated direct current signal is defeated by spontaneous potential automatic compensator 3.Input voltage △ V
MNSampling retainer 2, its function is when artificial electric field is set up in AB power supply, the MN end will be imported the stack potential value of artificial electric field and natural electric field, when switch during in the S position, electric capacity will be charged to △ V
MNValue, when switch during in the H position, capacitance voltage will remain unchanged.Spontaneous potential automatic compensator 3, before artificial electric field is set up in the AB power supply, switch ground connection, make electric capacity be charged to the spontaneous potential value of the earth, when switch went to " from electronic compensating " position, electric capacity sealed in high resistance operating amplifier 6 in-phase input ends, and this moment, the potential value on the electric capacity was equal with the spontaneous potential value numerical value of MN end and direction is opposite, cancel out each other, thereby reach the purpose of compensation automatically.After this, the worker's electric field by the AB power supply is set up then only has the potential value of the artificial electric field of MN interpolar to flow to high resistance operating amplifier 6.The function of the voltage signal generator 4 that self-correcting is used is when input end MN short circuit, and available this signal source inspection apparatus performance when instrument is worked, with signal generator 4 ground connection, will be measured input signal like this and not make a difference.When supply current sampling holder 5 is set up artificial electric field in the AB power supply, the AB circuit will constitute the loop by 0.1 ohm of measuring resistance, the voltage that electric current flows through the measuring resistance generation charges to electric capacity, as sampling, before outage, switch is gone to the H position, electric capacity will break away from the AB feed circuit, capacitance voltage is in hold mode, during measurement, switch is gone to I
ABThe position can be by measuring the voltage indicator current value of capacitor C end.The function of high resistance operating amplifier 6 is to follow usefulness with the homophase amplification as homophase, through the artificial potential value △ V behind electronic compensating
MN, or through connecing the capacitance voltage value of measuring resistance, by the circuit of high resistance operating amplifier 6, or be with threshold voltage after obstructing conversion in the follower mode and export, or with the amplifier mode with input voltage amplify ten by after export, finally be defeated by 3 1/2 liquid crystal digital voltage tables 8, show reading, this instrument has three ranging, be 2000mV, 200mV and 20mV third gear are when working with preceding two grades, high resistance operating amplifier 6 is made follower usefulness, makes ten times of amplifiers usefulness for back one grade.The power supply of high resistance operating amplifier 6 work usefulness is from negative voltage transition device 7, and its effect is the negative supply that the 6V positive supply of input is converted to nearly same value, with two groups of power supplys of acquisition ± 6V, for high resistance operating amplifier 6 usefulness.The display digit scope of the liquid crystal display digital voltmeter 8 that constitutes with the little power consumption A/D converter of CMOS chip 7126 is 0-1999, when input direct voltage is 199, during 9mV, show that full reading is 1999, to 200mV, three ranging of 2000mV and 20mV, high resistance operating amplifier 6 output terminals are followed with homophase respectively, decay to 1/10th and ten times of three kinds of modes of in-phase amplifier connect 3 1/2 liquid crystal display digital voltmeters, 8 input ends, be 200mV(199.9 with the maximum voltage input value that guarantees each ranging) and show the full scale numeral.When changing the instrument ranging, the radix point position on 3 1/2 LCD changes thereupon, makes the preceding one digit number of radix point be shown as the mV value.
Technical economical index of the present utility model is as follows:
1, display mode and scope: liquid crystal digital shows: show 3 1/2, indication range 0-1999.
2, potential difference measurement ranging: be divided into third gear: 2V, 200mV, 20mV, its voltage resolution is respectively the 1mV/ word, 0.1mV/ word, 10 μ V/ words.
3, current measurement ranging: it is 10mA/1mV that potential difference (PD) and current conversion are closed, so the current measuring range corresponding with three potential measurement shelves is respectively 20A, and 2A, 0.2A considers the button safety of powering, supply current should be not more than 2A.
4, measuring error: 0.1% ± 1 word of full ranging value.
5, each input impedance of measuring is all greater than 1000 megohms.
6, has the function that spontaneous potential compensates automatically.
7, has the function that tested current potential positive-negative polarity shows automatically.
8, have the sampling of tested supply current and potential difference (PD) and keep function, △ V is read in both maintenances of sampling simultaneously respectively during power supply after stopping power supply
MNWith I
ABValue.
9, the time constant of ac filter circuit is adjustable, divides two grades of big or small RC, and to the interchange undesired signal of 50Hz frequency, damping capacity is respectively: ten thousand times of big RC95dB(5.87), little RC36dB(65 is doubly), frequency is high more, and damping capacity is big more.
10, power consumption: instrument is powered with 9V and 6V two Battery packs, and power consumption is respectively 1.5mW and 30mW, and total power consumption is less than 40mW.
11, instrument insulation resistance: under normal circumstances, the AB jack is not less than 1000 megohms between MN jack and shell.
12, instrument power supply button disconnecting DC power 1.2KW(3A, 400V).
13, instruments weight: 2.3 kilograms, add 3 kilograms of tripod gross weights.
14, physical dimension: 22.7 * 15.2 * 10 centimetres.
The utility model compared with prior art has following advantages:
1, simple in structure: owing to adopt cmos component, high resistance operating amplifier, negative pressure converter, make up with quality capacitance, guarantee the stability of instrument, substituted existing DDC-2 electron automatic compensator used numerous and diverse field of electronic components and circuit, so that structure is simplified greatly.
2, antijamming capability is extremely strong, exchange interference performance because of possessing high sensitivity simultaneously with extremely strong compacting, can obtain high signal to noise ratio (S/N ratio), can guarantee that instrument can be in strong jamming district that the DDC-2 electron automatic compensator can't be worked (as under the high-tension bus-bar, the cities and towns industrial district) operate as normal, can realize big pole span again, the mode of miniwatt power supply is worked.
3, sensitivity and measuring accuracy height: at maximum sensitivity 20mV shelves, resolution is 10 μ V/ words, changes only ± 1 word, so the relative error of reading and measuring accuracy are all than the high order of magnitude of DDC-2 electron automatic compensator.
4, easy and simple to handle: adopt from electric automatic compensator and liquid crystal digital to show, the hand adjustment of the DDC-2 electron automatic compensator that omits is from the operation of electronic compensating and manual tested polarity of voltage indication.
5, low in energy consumption, in light weight, volume is little, and power consumption is lower than 40mV, 2.5 kilograms of weight, volume 1180cm
3Divide 10 times of minimizings, 4 times and 5 times than DDC-2 electron automatic compensator.
6, social and economic benefits and good: cost is low, labour intensity is low, the efficient height, because little working current can guarantee measuring accuracy,, choose heavy battery case and electric wire without the special messenger so available portable cell is made power supply, at least reduce by three people than the required manpower of DDC-2 electron automatic compensator, the battery purchase commodity also can be saved greatly, and 1 year job costs of an electrical method group reduce thousands of units at least, and Instrument purchase takes only 1,000 yuan.
Claims (5)
1, a kind of resistivity prospecting DC digital electric pilot, by high resistance operating amplifier constitute from the automatic compensation apparatus of electricity, the sampling retainer, liquid crystal digital gauge outfit and signal source circuit functional block that amplifier block and 7100 series As/D converter chip constitutes combine, it is characterized in that high resistance operating amplifier can be connected into the homophase input and follow and in-phase amplifier realization electric certainly compensation and power supply automatically, the magnitude of voltage sampling keeps, 7100 series As/D converter chip and liquid crystal digital display connect and compose digital voltmeter, utilize the reference voltage generation signal source of chip itself to be used for instrument self checking.
2, DC digital electric pilot as claimed in claim 1 is characterized in that constituting from the electric automatic compensator and the electric current of surveying, voltage sampling retainer with high resistance operating amplifier and quality capacitance.
3, DC digital electric pilot as claimed in claim 1 is characterized in that utilizing the voltage stabilizing output of 7100 series As/D converter chip as the instrument self checking signal source circuit.
4, DC digital electric pilot as claimed in claim 1 is characterized in that using the negative pressure converter ic, and positive and negative two-phase power supply is provided.
5, DC digital electric pilot as claimed in claim 1 is characterized in that adopting the damping capacity adjustable filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88213424 CN2042601U (en) | 1988-09-21 | 1988-09-21 | Dc digital electricity measuring instrument for electric prospecting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88213424 CN2042601U (en) | 1988-09-21 | 1988-09-21 | Dc digital electricity measuring instrument for electric prospecting |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2042601U true CN2042601U (en) | 1989-08-09 |
Family
ID=4846541
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 88213424 Expired - Lifetime CN2042601U (en) | 1988-09-21 | 1988-09-21 | Dc digital electricity measuring instrument for electric prospecting |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2042601U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105093337A (en) * | 2015-07-09 | 2015-11-25 | 重庆地质仪器厂 | Electrical prospecting simulator |
| CN106125143A (en) * | 2016-08-11 | 2016-11-16 | 中国科学院地球化学研究所 | DC fields fixed power supply exploitation method |
| CN114624490A (en) * | 2022-03-11 | 2022-06-14 | 苏州联讯仪器有限公司 | Photoelectric conversion and sample hold direct current coupling interconnection device of optical sampling oscilloscope |
-
1988
- 1988-09-21 CN CN 88213424 patent/CN2042601U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105093337A (en) * | 2015-07-09 | 2015-11-25 | 重庆地质仪器厂 | Electrical prospecting simulator |
| CN105093337B (en) * | 2015-07-09 | 2017-09-08 | 重庆地质仪器厂 | A kind of electrical simulation check device |
| CN106125143A (en) * | 2016-08-11 | 2016-11-16 | 中国科学院地球化学研究所 | DC fields fixed power supply exploitation method |
| CN114624490A (en) * | 2022-03-11 | 2022-06-14 | 苏州联讯仪器有限公司 | Photoelectric conversion and sample hold direct current coupling interconnection device of optical sampling oscilloscope |
| CN114624490B (en) * | 2022-03-11 | 2022-11-15 | 苏州联讯仪器有限公司 | Photoelectric conversion and sample hold direct current coupling interconnection device of optical sampling oscilloscope |
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| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |