CN205015467U - Direct current resistance case calibrating installation - Google Patents
Direct current resistance case calibrating installation Download PDFInfo
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- CN205015467U CN205015467U CN201520717728.6U CN201520717728U CN205015467U CN 205015467 U CN205015467 U CN 205015467U CN 201520717728 U CN201520717728 U CN 201520717728U CN 205015467 U CN205015467 U CN 205015467U
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- resistance
- terminal
- tested
- examined
- measuring
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- 238000009434 installation Methods 0.000 title claims abstract description 11
- 239000011810 insulating material Substances 0.000 claims description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- BJQHLKABXJIVAM-UHFFFAOYSA-N bis(2-ethylhexyl) phthalate Chemical compound CCCCC(CC)COC(=O)C1=CC=CC=C1C(=O)OCC(CC)CCCC BJQHLKABXJIVAM-UHFFFAOYSA-N 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Abstract
The utility model discloses a direct current resistance case calibrating installation, including the box, be equipped with constant current source and direct current digital voltmeter in the box, be equipped with six binding post on the box, be first respectively and examined resistance end, second and examined that resistance end, third are examined the resistance end, resistance end, standard resistance end and the 2nd standard resistance end are examined to the fourth, standard resistance has been met between standard resistance end and the 2nd standard resistance end, direct current digital voltmeter's output termination has change over switch, the output of constant current source connects the first resistance end of being examined through the wire, and the 2nd standard resistance of input termination end, standard resistance end are examined the resistance end with the second and be connected, and first resistance end and the third examined is examined resistance and is held and be connected, and the second is examined resistance and is held and examined resistance with the fourth and hold and be connected. The utility model discloses simple structure, with low costs, convenient to carry is convenient for to the examination of direct current resistance case.
Description
Technical field
The utility model relates to resistance Calibration Technology field, particularly relates to a kind of DC resistance box calibrating installation.
Background technology
DC resistance box be a kind of converting means that utilizes to change the variable resistor measurer of resistance value, it is a kind of many-valued resistor, is widely used in DC circuit, as the instrument of regulating circuit parameter, also can be used as variable resistance standard measurer.Its resistance value can change by certain ladder in known range.Resistance box utilizes converting means to change the variable resistor utensil of its resistance.This converting means adopts ten to enter disc type (knob) structure usually, also as required, can adopt plug-type and terminal formula structure.The circuit of resistance box can be divided into series circuit and connection in series-parallel railway superstructures.DC resistance box can be used as etalon, also can as surveying instrument.The many-valued resistor that DC resistance box is made up of the decade resistor of single or some series connection, under reference condition, DC resistance box each ten enters dish class of accuracy corresponding separately.
The calibrating of DC resistance box typically uses high-grade d.c.comparator type bridge or direct-reading electric bridge etc., and these equipment operatings are complicated, waste time and energy.
Utility model content
The purpose of this utility model is exactly to solve the problem, and provides a kind of DC resistance box calibrating installation, and structure is simple, and cost is low, and easy to operate.
To achieve these goals, the utility model adopts following technical scheme:
A kind of DC resistance box calibrating installation, comprise casing, constant current source and DC digital voltmeter is provided with in described casing, described casing is provided with six connection terminals, is respectively the first tested resistance terminal, the second tested resistance terminal, the 3rd tested resistance terminal, the 4th tested resistance terminal, the first measuring resistance end and the second measuring resistance end; Measuring resistance is connected between first measuring resistance end and the second measuring resistance end; The output terminal of described DC digital voltmeter is connected to switch;
The output terminal of described constant current source connects described first tested resistance terminal by wire, input termination second measuring resistance end, first measuring resistance end is connected with the second tested resistance terminal, and the first tested resistance terminal is connected with the 3rd tested resistance terminal, and the second tested resistance terminal is connected with the 4th tested resistance terminal.
Described DC digital voltmeter is provided with two dial plates.
Described measuring resistance adopts BZ3 type measuring resistance.
Described casing adopts insulating material.
The beneficial effects of the utility model are:
The utility model is provided with two dial plates, the reading of a corresponding measuring resistance, and the reading of a corresponding measured resistance, is not easy confusion like this, is convenient to record.
The utility model structure is simple, and cost is low, easy to carry, is convenient to the calibrating to DC resistance box.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model;
Fig. 2 is circuit theory diagrams of the present utility model;
Wherein, 1. casing, 2. switch, 3. dial plate, 4. the second measuring resistance end, 5. the first measuring resistance end, 6. the second tested resistance terminal, 7. the first tested resistance terminal, 8. the 3rd tested resistance terminal, 9. the 4th tested resistance terminal.
Embodiment:
Below in conjunction with accompanying drawing and embodiment, the utility model is described further:
As shown in Figure 1, a kind of DC resistance box calibrating installation, comprise casing 1, casing 1 adopts insulating material, constant current source and DC digital voltmeter is provided with in casing 1, casing 1 is provided with six connection terminals, is respectively the tested resistance terminal 4 of the first tested resistance terminal 7, second, the 3rd tested resistance terminal 8, the 4th tested resistance terminal 9, first measuring resistance end 5 and the second measuring resistance end 4; Measuring resistance R is connected between first measuring resistance end 5 and the second measuring resistance end 4
n; The output terminal of DC digital voltmeter is connected to switch K;
The output terminal of constant current source connects the first tested resistance terminal 7 by wire, input termination second measuring resistance end 4, first measuring resistance end 5 is connected with the second tested resistance terminal 6, and the first tested resistance terminal 7 is connected with the 3rd tested resistance terminal 8, and the second tested resistance terminal 6 is connected with the 4th tested resistance terminal 9.
DC digital voltmeter is provided with two dial plates, and the surface of casing is located at by two dial plates.
DC digital voltmeter: adopt 1081 digital multimeters, the input impedance of 100mV, 1V and 10V range used is greater than 10G Ω, and the permission error of indication of these three ranges under (23 ± 1) DEG C condition is as shown in table 1 below.
Table 1
Wherein: V
xfor digital watch reading, V
m=2 × full scale
Measuring resistance: adopt BZ3 type secondary standard resistance, wherein (1 ~ 10
4) Ω stability is 10 × 10
-6, calibration expanded uncertainty is U=3 × 10
-6, k=2.
Constant current source: adopt RT9601 high-performance direct current precision voltage source, current range and degree of stability: 0.1mA1mA10mA100mA degree of stability≤2 × 10
-6, extend current 1A degree of stability≤3 × 10
-6, 10A degree of stability≤5 × 10
-6.
Two ends of tested DC resistance box are connected between the first tested resistance terminal 7 and the second tested resistance terminal 6 when examining and determine resistance box by principle of work of the present utility model.
Switch K and the first measuring resistance end 5 and the second measuring resistance end 4 are connected, regulates constant current source to export, make DC digital voltmeter reading V
nwith the actual value R of measuring resistance
n(R
n=R
20[1+ α (t-20)+β (t-20)
2], t is environment temperature) consistent.As measuring resistance R
nwhen actual value is 99.9974 Ω, DC digital voltmeter reading V
nfor 0.999974V.Now have:
V
N＝I
0R
N(1)
By switch transition K and V
xconnect, DC digital voltmeter reading is V
x, now have:
V
X＝I
0R
X(2)
Obtained by (1) formula and (2) formula:
Due to V
nwith R
nnumerical value " unanimously ", V
n/ R
nnumerical value be 10
n, n is integer, therefore, and R
xnumerical value be:
{ R
x}={ V
x} × 10
n, thus realize the direct-reading calibrating of measured resistance, the principle of work of Here it is this device.
By reference to the accompanying drawings embodiment of the present utility model is described although above-mentioned; but the restriction not to the utility model protection domain; one of ordinary skill in the art should be understood that; on the basis of the technical solution of the utility model, those skilled in the art do not need to pay various amendment or distortion that creative work can make still within protection domain of the present utility model.
Claims (4)
1. a DC resistance box calibrating installation, it is characterized in that, comprise casing, constant current source and DC digital voltmeter is provided with in described casing, described casing is provided with six connection terminals, is respectively the first tested resistance terminal, the second tested resistance terminal, the 3rd tested resistance terminal, the 4th tested resistance terminal, the first measuring resistance end and the second measuring resistance end; Measuring resistance is connected between first measuring resistance end and the second measuring resistance end; The output terminal of described DC digital voltmeter is connected to switch;
The output terminal of described constant current source connects described first tested resistance terminal by wire, input termination second measuring resistance end, first measuring resistance end is connected with the second tested resistance terminal, and the first tested resistance terminal is connected with the 3rd tested resistance terminal, and the second tested resistance terminal is connected with the 4th tested resistance terminal.
2. a kind of DC resistance box calibrating installation as claimed in claim 1, is characterized in that, described DC digital voltmeter is provided with two dial plates.
3. a kind of DC resistance box calibrating installation as claimed in claim 1, is characterized in that, described measuring resistance adopts BZ3 type measuring resistance.
4. a kind of DC resistance box calibrating installation as claimed in claim 1, is characterized in that, described casing adopts insulating material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520717728.6U CN205015467U (en) | 2015-09-16 | 2015-09-16 | Direct current resistance case calibrating installation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520717728.6U CN205015467U (en) | 2015-09-16 | 2015-09-16 | Direct current resistance case calibrating installation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205015467U true CN205015467U (en) | 2016-02-03 |
Family
ID=55214062
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520717728.6U Active CN205015467U (en) | 2015-09-16 | 2015-09-16 | Direct current resistance case calibrating installation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205015467U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114217113A (en) * | 2021-11-25 | 2022-03-22 | 广西电网有限责任公司电力科学研究院 | Improved direct current resistance box voltage comparison measurement method and system |
-
2015
- 2015-09-16 CN CN201520717728.6U patent/CN205015467U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114217113A (en) * | 2021-11-25 | 2022-03-22 | 广西电网有限责任公司电力科学研究院 | Improved direct current resistance box voltage comparison measurement method and system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |