CN2228234Y - carbon rod resistance tester - Google Patents
carbon rod resistance tester Download PDFInfo
- Publication number
- CN2228234Y CN2228234Y CN 94236382 CN94236382U CN2228234Y CN 2228234 Y CN2228234 Y CN 2228234Y CN 94236382 CN94236382 CN 94236382 CN 94236382 U CN94236382 U CN 94236382U CN 2228234 Y CN2228234 Y CN 2228234Y
- Authority
- CN
- China
- Prior art keywords
- carbon rod
- knife rest
- resistance
- electric current
- rod resistance
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 22
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 22
- 238000009413 insulation Methods 0.000 claims description 2
- 238000005259 measurement Methods 0.000 abstract description 6
- 238000000034 method Methods 0.000 abstract 1
- 230000000007 visual effect Effects 0.000 abstract 1
- 239000003990 capacitor Substances 0.000 description 2
- 239000003610 charcoal Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
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- Measurement Of Resistance Or Impedance (AREA)
Abstract
A carbon rod resistance tester belongs to a carbon rod resistance testing device and comprises a constant current source circuit, a circuit consisting of a display gauge head and an amplifying circuit and a measuring knife rest. The measuring knife rest is arranged on the insulating plate and is fixed with a voltage knife rest and a current knife rest. The resistance value of the carbon rod per unit length is reflected by the constant current added to the carbon rod to be measured and the voltage value of the carbon rod per unit length. The method has the characteristics of high measurement efficiency, simplicity in operation, stable and visual numerical value display and the like.
Description
The utility model belongs to the measurement mechanism of carbon rod resistance.
At present, domestic each charcoal ink factory, Battery Plant are during to the carbon rod resistance measurement of unit length, and what all adopt is that double bridge is measured, and during measurement, measures carbon rod length earlier, measures its resistance value again, obtains the resistance of unit length, and reading is not directly perceived; In addition, between tested carbon rod and the double bridge, connect, measure very inconvenient and speed is slow with lead.
The purpose of this utility model will provide a kind of convenience, high-level efficiency, carbon rod resistance meter that precision is high measured exactly.
The utility model adopts digital display circuit and measures knife rest two macrostructures.In circuit structure: 1, power unit has three groups, at the 220V alternating current behind transformer, diode rectification: three terminal regulator output+5V A.7805, for constant-current source circuit, three terminal regulator output+9V B.7809, confession
Gauge outfit, C. stabilivolt Z
1And Z
2Output+12V is for integrated package LM741 amplifier.2. amplifying circuit is made of LM741, and input signal is exported to signal from the voltage on resistance R B or the tested carbon rod
Gauge outfit.In the circuit, W
1Be used to adjust to zero point, W
2Be used to adjust enlargement factor, the enlargement factor of this amplifier is 40 times, 3,
Gauge outfit, its range are 0～199.9mV.4. constant-current source circuit is adjusted resistance R
2, the steady current of the exportable 10mA of constant current tube DH303.In tested carbon rod, add steady current,, reflect the resistance value on its unit length by measuring the magnitude of voltage on the carbon rod certain-length.The structure of measuring knife rest is: on an insulated substrate, vertically be provided with two electric current knife rests, the inboard is provided with two voltage knife rests, and distance is a certain value between the two voltage knife rests.Under the electric current knife rest spring is housed, at ordinary times, two electric current knife rest short circuits.During measurement, tested carbon rod is imitated on the electric current knife rest, press with hand one, the electric current knife rest is under the effect of spring force, break away from former contacting and form the bolt in loop, like this, carbon rod just inserts in the constant current loop, constant current source is through RB, through amplifying circuit, thereby demonstrates the resistance of carbon rod on gauge outfit.This tester measuring accuracy is 0.5 grade.According to its structure and principle, also can be used for measuring the uniform claval resistance of other material.
The utility model is compared with prior art, has the efficiency of measurement height, and simple to operate, numerical value shows characteristics such as stable, directly perceived.
Fig. 1 is a circuit diagram of the present utility model.
Fig. 2 measures the front view (FV) of knife rest for the utility model.
Fig. 3 measures the outboard profile of knife rest for the utility model.
As shown in Figure 1, by capacitor C
1, resistance R
1Power circuit with three terminal regulator 7805 is formed through constant current tube DH303, by 0.1 ohm resistance R B, is connected to and measures knife rest A and K switch
2-1, K
2-2On.By capacitor C
2, resistance R
3With the power circuit that three terminal regulator 7809 is formed, link
On the gauge outfit B.Stabilivolt Z
1And Z
2Link respectively on the integrated package LM741, be connected to the R of adjustable enlargement factor on the integrated package LM741
5And W
2, also be connected with the resistance R that is used for the zero-bit adjustment at LM741
6, R
7And W
1Before power transformer T, be provided with master switch K
1And power light.
As Fig. 2, shown in Figure 3, on insulation fixed head 10,, two L shaped voltage knife rests 3,4 to be fixed respectively with bolt 1.2 and nut 11.12, its spacing is 2.50cm.In its outside, with bolt 6,7 and pad 13,14 and nut 15,16, two L shaped electric current knife rests 8,9 movable respectively fixing, electric current knife rest 8,9 with pad 13, between 14, be equipped with respectively and be enclosed within bolt 6, spring 17 on 7,18, and be with plastic tube 5 respectively, 21 bolt 6,7 both sides, fix two bolts 19 on the insulcrete 10,20, the horizontal sides of electric current knife rest 9 is under the effect of spring 18, with bolt 19,20 contact (holding identical in addition) when connecting, the electric current knife rest of measuring on the knife rest 9 is pressed the anode in constant current source loop, and electric current knife rest 8 is received the negative terminal in constant current source loop, voltage knife rest 3,4 receive switch K
2-1, K
2-2On.
Claims (4)
1, a kind of carbon rod resistance meter is made up of transformer, three terminal regulator, display gauge head, integrated package LM741, power light, switch etc., it is characterized in that: constant current tube DH303 through resistance R B, is connected to and measures knife rest A and K switch
2-1, K
2-2On.
2, carbon rod resistance meter according to claim 1 is characterized in that: on the insulation fixed head 10, be fixed with two L shaped voltage knife rests 3,4, its outside activity is fixed with two L shaped electric current knife rests 8,9.
3, carbon rod resistance meter according to claim 2 is characterized in that: electric current knife rest 8,9 contacts with the bolt 19,20 of its both sides respectively.
4, carbon rod resistance meter according to claim 2 is characterized in that: electric current knife rest 8,9 times has two springs 17,18 that are enclosed within on the bolt 6,7 respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94236382 CN2228234Y (en) | 1994-12-31 | 1994-12-31 | carbon rod resistance tester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94236382 CN2228234Y (en) | 1994-12-31 | 1994-12-31 | carbon rod resistance tester |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2228234Y true CN2228234Y (en) | 1996-05-29 |
Family
ID=33844342
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 94236382 Expired - Fee Related CN2228234Y (en) | 1994-12-31 | 1994-12-31 | carbon rod resistance tester |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2228234Y (en) |
-
1994
- 1994-12-31 CN CN 94236382 patent/CN2228234Y/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |