CN104374978A - Multimeter and method for testing output voltages of power circuit - Google Patents
Multimeter and method for testing output voltages of power circuit Download PDFInfo
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- CN104374978A CN104374978A CN201310352756.8A CN201310352756A CN104374978A CN 104374978 A CN104374978 A CN 104374978A CN 201310352756 A CN201310352756 A CN 201310352756A CN 104374978 A CN104374978 A CN 104374978A
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- multimeter
- power circuit
- output voltage
- testing
- resistance
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Abstract
The invention provides a multimeter for testing the output voltages of a power circuit. The multimeter is used for testing the stability of the output voltages of the power circuit and comprises two meter pens, two meter pen connecting points correspondingly connected with the two meter pens, a mode drive plate, a resistance regulating drive plate and a display screen. A plurality of work modes including a testing mode are arranged on the mode drive plate. When the multimeter is in the testing mode, an adjustable resistor is connected between the meter pen connecting points in series. When the output voltages of the power circuit are measured, the adjustable resistor is connected into the circuit, and therefore the resistance value in the power circuit is changed, and flexible changing of resistance is achieved. The invention further provides a testing method of the multimeter for testing the output voltages of the power circuit.
Description
Technical field
The present invention relates to a kind of multimeter, particularly relate to a kind of multimeter and utilize multimeter to carry out the method for testing of power circuit output voltage test.
Background technology
As everyone knows, multimeter is all use as surveying instrument, and such as measuring voltage electric current and resistance and electric capacity and diode etc., have very large effect in reality is measured, be indispensable electronic equipment, but current multimeter only have measurement function.
At present, in the stability test of electric power output voltage, need the instability of test voltage on the impact of control chip function, for verifying whether this control chip can normally work in its electrical code.As everyone knows, large scale integrated chip (LSI chip) all can arrange multiple power supply, as VCC, VTT etc. of CPU, and these power supplys are after divider resistance is determined, output voltage is also changeless (designing according to required voltage), and when needing to export different voltage, then need the divider resistance accessing different resistance.And to change the consistent way of resistance be manually change divider resistance, so not only the normal work of circuit board is threatened, and manually change and need to consume a large amount of time and manpower, be unfavorable for saving cost.
Summary of the invention
In view of this, be necessary a kind of multimeter to be provided and to utilize multimeter to carry out the method for testing of power circuit output voltage test.
The invention provides a kind of multimeter, this multimeter is connected with a power circuit, and tests the output voltage stability of this power circuit, and described multimeter comprises:
Two test pencils;
One adjustable resistance;
One mode dial, for controlling and indicate the mode of operation of described multimeter, when this multimeter is in test pattern, is serially connected with between described two test pencils by adjustable resistance;
One resistance adjustment driver plate, for regulating the resistance of described adjustable resistance, and
One display screen, for showing test results.
Present invention also offers a kind of method of testing utilizing multimeter to carry out the test of power circuit output voltage, the method comprises:
A), the output voltage standard value of a power circuit voltage output end is obtained;
B), an adjustable resistance is accessed at described power circuit;
C), regulate the resistance of described adjustable resistance, and obtain the output voltage of power circuit voltage output end;
D), determine that the output voltage of the power circuit voltage output end got is whether within the scope of the nominal error of output voltage standard value, if so, illustrating in this power circuit can steady operation, otherwise illustrates that this power circuit can not steady operation.
A kind of multimeter of the present invention and utilize multimeter to carry out the method for testing of power circuit output voltage test, multimeter arranges a test pattern, when this multimeter is in test pattern, to connect between two test pencils an adjustable resistance, when the output voltage of measurement one power circuit, adjustable resistance place in circuit, thus the divider resistance resistance changing power circuit, reach the flexible change of divider resistance, eliminate and change time of bringing of resistance and manpower consumption.
Accompanying drawing explanation
Fig. 1 is the multimeter composition schematic diagram of one embodiment of the present invention.
Fig. 2 is the circuit diagram of multimeter test pattern in Fig. 1.
Fig. 3 is the method for testing process flow diagram of multimeter in Fig. 1.
Main element symbol description
| Multimeter | 100 |
| Test pencil | 10 |
| First test pencil | 11 |
| Second test pencil | 12 |
| Test pencil tie point | 20 |
| First test pencil tie point | 21 |
| Second test pencil tie point | 22 |
| Adjustable resistance | 23 |
| Mode dial | 30 |
| Pattern display disc | 31 |
| Knob | 32 |
| Resistance adjustment driver plate | 40 |
| Display screen | 50 |
| Power circuit | 200 |
| Control chip | 60 |
| Power supply | VCC |
| Divider resistance | R1、R2 |
| Tie point | a |
| Voltage output end | VOUT |
| Test lead | VFB |
| Step | S1~S3 |
Following embodiment will further illustrate the present invention in conjunction with above-mentioned accompanying drawing.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail.
Refer to Fig. 1, the invention provides a kind of multimeter 100, this multimeter 100 is for testing the output voltage stability of a power circuit 200.Described multimeter 100 comprises two test pencil 10, two test pencil tie point 20, mode dial 30, resistance adjustment driver plate 40 and display screens 50.Wherein said test pencil tie point 20, mode dial 30, resistance adjustment driver plate 40 and display screen 50 are arranged in order on the workplace of described multimeter 100, and described test pencil 10 is then connected with described test pencil tie point 20 respectively by cable.
Described test pencil 10 is for connecting described power circuit 200.In the present embodiment, this two test pencil 10 comprises the first test pencil 11 and the second test pencil 12.
Described two test pencils 10 are connected with described two test pencil tie points 20 respectively, realize the electrical connection of this test pencil 10 and described multimeter 100.In the present embodiment, this test pencil tie point 20 comprises the first test pencil tie point 21 and the second test pencil tie point 22, and is electrically connected with described first test pencil 11 and the second test pencil 12 respectively.
Described mode dial 30 is for selecting the mode of operation of described multimeter 100, this mode dial 30 comprises pattern display disc 31 and a knob 32, this pattern display disc 31 is provided with multiple mode of operation, and this knob 32 is for controlling the mode of operation of described multimeter 100.In the present embodiment, this pattern display disc 31 is provided with multiple measurement pattern, comprise voltage measuring mode " U ", current measurement pattern " I ", other measurement patterns " OT1 " and " OT2 " and a test pattern " TS ", when described knob 32 turns to different mode, this multimeter 100 is in different mode of operations.In the present embodiment, principle of work and the circuit structure of the voltage measuring mode " U " of described multimeter 100, current measurement pattern " I " and other measurement patterns " OT1 " and " OT2 " are prior art, therefore do not repeat them here.
See also Fig. 2, when this knob 32 rotates to test pattern, an adjustable resistance 23 is connected with between described first test pencil tie point 21 and the second test pencil tie point 22, that is when this multimeter 100 is in test pattern, described adjustable resistance is serially connected with between described first test pencil 11 and the second test pencil 12.
Described resistance adjustment driver plate 40 is for regulating the resistance of described adjustable resistance, and in the present embodiment, this adjustable resistance can regulate in infinitely-great scope 0 by this resistance adjustment driver plate 40.
The parameter of power circuit 200 of described display screen 50 for showing described test pencil 10 and measuring.In the present embodiment, this display screen 50 is a LCD display, by the parameter of this power circuit 200 of text importing.In other embodiments, this display screen 50 can also be LED display.
Described power circuit 200 comprises two divider resistance R1 and R2, a power supply VCC and a control chip 60.Described divider resistance R1 one end is connected with R2, and the other end is voltage output end VOUT, and described divider resistance R2 other end ground connection, there is a tie point a between this two divider resistance R1 and R2, this tie point a is connected with a test lead VFB.Described control chip 60 is connected with tie point a and described power supply VCC, and this control chip 60 is for controlling the voltage swing of this tie point a.In the present embodiment, this control chip 60 controls the voltage of this tie point a is a fixed value, such as 0.7V.When described mode dial 30 is in test pattern, described adjustable resistance is in parallel with divider resistance R1, and by regulating described resistance adjustment driver plate 40, the resistance in parallel with divider resistance R1 changes, therefore the output voltage of voltage output end VOUT also changes.
When described multimeter 100 is in test pattern, described adjustable resistance 23 by the first test pencil 11 and the second test pencil 12 in parallel with divider resistance R1.Regulate described resistance adjustment driver plate 40, the divider resistance resistance of access power circuit 200 changes, and the output voltage of voltage output end VOUT also changes thereupon.
Refer to Fig. 3, for utilizing described multimeter 100 to carry out the method for testing process flow diagram of power circuit output voltage test in an embodiment of the present invention, the method comprises:
Step S1, obtains the output voltage of the voltage output end VOUT of power circuit 200.Particularly, two test pencils 10 are connected with voltage output end VOUT and test lead VFB respectively, and multimeter 100 is placed in voltage measuring mode.The output voltage Vol1 of the voltage output end VOUT of reading displayed screen 50 display, the standard value of this output voltage Vol1 and output voltage.In the present embodiment, when described multimeter is placed in test pattern, adjustable resistance can also be regulated to infinitely great by described resistance adjustment driver plate 40, now, also can measure the standard value of this output voltage Volt1.
Step S2, connects an adjustable resistance 23 between the voltage output end VOUT and test lead VFB of described power circuit 200.Particularly, described multimeter 100 is placed in test pattern, adjustable resistance 23 is serially connected between described voltage output end VOUT and test lead VFB.In the present embodiment, when this multimeter is placed in test pattern, adjustable resistance 23 to infinity can also be regulated by described resistance adjustment driver plate 40, now, also can measure the standard value of this output voltage Volt1.
Step S3, regulates the resistance of described adjustable resistance 23, obtains the output voltage Vol2 of voltage output end VOUT simultaneously.Particularly, regulating resistance regulates driver plate 40, and the resistance of described adjustable resistance 23 also changes thereupon, the output voltage Vol2 of the voltage output end VOUT of reading displayed screen 50 display.
Step S4, determines that the output voltage Vol2 of the voltage output end VOUT obtained is whether within the scope of the nominal error of standard value Vol1.If so, illustrate that control chip 60 can steady operation; Otherwise, the unstable working condition of this control chip 60 is described.In the present embodiment, described nominal error scope is ± 5%, and when namely described output voltage Vol2 is in 95% and 105% of standard value Vol1, described control chip 60 is in stable duty.
A kind of multimeter of the present invention and utilize multimeter to carry out the method for testing of power circuit output voltage test, multimeter arranges a test pattern, when this multimeter is in test pattern, to connect between two test pencils an adjustable resistance, when the output voltage of measurement one power circuit, adjustable resistance place in circuit, thus the divider resistance resistance changing power circuit, reach the flexible change of divider resistance, eliminate and change time of bringing of resistance and manpower consumption.
Those skilled in the art will be appreciated that; above embodiment is only used to the present invention is described; and be not used as limitation of the invention; as long as within spirit of the present invention, the suitable change do above embodiment and change all drop within the scope of protection of present invention.
Claims (8)
1. a multimeter, this multimeter is connected with a power circuit, and tests the output voltage stability of this power circuit, it is characterized in that, described multimeter comprises:
One test pattern, tests the output voltage stability of described power circuit under described test pattern;
Two test pencils, for being connected to described power circuit;
One adjustable resistance, is serially connected with between described two test pencils when described multimeter is under described test pattern;
One mode dial, for controlling and indicate the mode of operation of described multimeter, comprises and described multimeter is adjusted to described test pattern, to be serially connected with by described adjustable resistance between described two test pencils;
One resistance adjustment driver plate, for regulating the resistance of described adjustable resistance, and
One display screen, for showing test results.
2. multimeter as claimed in claim 1, is characterized in that, described resistance adjustment driver plate regulates the scope of described adjustable resistance to be 0 to infinitely great.
3. a method of testing for the output voltage of testing power supply circuit, is characterized in that, the method comprises:
A), the output voltage standard value of a power circuit voltage output end is obtained;
B), an adjustable resistance is accessed at described power circuit;
C), regulate the resistance of described adjustable resistance, and obtain the output voltage of power circuit voltage output end;
D), determine that the output voltage of the power circuit voltage output end got is whether within the scope of the nominal error of output voltage standard value.
4. the method for testing of the output voltage of testing power supply circuit as claimed in claim 3, it is characterized in that, described a) step is specially: a multimeter is set to a voltage measuring mode, and the output voltage testing the voltage output end of described power circuit by two test pencils of described multimeter is the output voltage standard value of this power circuit output end.
5. the method for testing of the output voltage of testing power supply circuit as claimed in claim 3, it is characterized in that, described b) step is specially: described multimeter is set to a test pattern, under described test pattern, two test pencils are electrically connected with described power circuit, and described adjustable resistance is accessed this power circuit.
6. the method for testing of the output voltage of testing power supply circuit as claimed in claim 5, it is characterized in that, described adjustable resistance is in parallel with a divider resistance of described power circuit.
7. the method for testing of the output voltage of testing power supply circuit as claimed in claim 3, it is characterized in that, described c) step is specially: the resistance being regulated described adjustable resistance by the resistance adjustment driver plate on described multimeter, shows the output voltage of described power circuit by the display screen on described multimeter.
8. the method for testing of the output voltage of testing power supply circuit as claimed in claim 3, it is characterized in that, if when the output voltage of power circuit is within the scope of the nominal error of described standard voltage value, judge that this power circuit can steady operation, otherwise, judge the unstable working condition of this power circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310352756.8A CN104374978A (en) | 2013-08-13 | 2013-08-13 | Multimeter and method for testing output voltages of power circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310352756.8A CN104374978A (en) | 2013-08-13 | 2013-08-13 | Multimeter and method for testing output voltages of power circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104374978A true CN104374978A (en) | 2015-02-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310352756.8A Pending CN104374978A (en) | 2013-08-13 | 2013-08-13 | Multimeter and method for testing output voltages of power circuit |
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| CN (1) | CN104374978A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109387678A (en) * | 2017-08-05 | 2019-02-26 | 富泰华工业（深圳）有限公司 | Voltmeter and its application method |
-
2013
- 2013-08-13 CN CN201310352756.8A patent/CN104374978A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109387678A (en) * | 2017-08-05 | 2019-02-26 | 富泰华工业（深圳）有限公司 | Voltmeter and its application method |
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Application publication date: 20150225 |
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| WD01 | Invention patent application deemed withdrawn after publication |