CN2758784Y

CN2758784Y - Cable tester

Info

Publication number: CN2758784Y
Application number: CN 200420114884
Authority: CN
Inventors: 沈科学
Original assignee: Individual
Current assignee: Individual
Priority date: 2004-12-27
Filing date: 2004-12-27
Publication date: 2006-02-15
Anticipated expiration: 2014-12-27

Abstract

The utility model relates to a cable testing instrument. The utility model comprises a single-chip controller U1 in which a liquid crystal display driving module is inbuilt, the signal input end and the signal output end of the single-chip controller U1 are respectively connected with two testing sockets 1 and 2; the signal input end of the single-chip controller U1 is also connected with a key S2 which is used for setting of the working state of the circuit, and the other end of the key S2 is connected with the negative pole of a power supply 8. Besides, the display output end of the single-chip controller U1 is directly connected with a liquid display screen 3; the liquid crystal display expansion control end of the single-chip controller U1 is connected with a liquid crystal display expansion circuit 4; the crystal input end and the crystal output end of the single-chip controller U1 are connected with a crystal oscillating circuit 5; a low-electricity detecting chip U2, a backlight control chip U3 and a chip controller U1 form a low-electricity detecting circuit 6 and a liquid crystal backlight circuit 7. The testing channel of the utility model utilizes input pins and output pins of a controller to send and receive signals and determine the basic physical performance of a cable to be detected, such as communication, an open circuit, a short circuit, etc., and the controller directly drives the liquid display screen 3 to display testing results.

Description

A kind of cable tester

[technical field]

The utility model relates to a kind of tester, the electronic device of the basic physical connection performance of particularly a kind of test cable.

[background technology]

Cable tester of the prior art is to utilize 8-bit microcontroller input, output port and treat that survey line two is connected to test, output port sends test massage and is treating that survey line uploads defeated, input port acceptance test signal, by 8-bit microcontroller the integrality of test signal is judged, thereby drawn test result.And utilize input/output port to be connected with the liquid crystal display driver module, and video data is delivered to the liquid crystal display driver module, video data shows on LCDs after the liquid crystal display driver module is handled.Because the chip of above-mentioned cable tester adopts 8-bit microcontroller, therefore, the liquid crystal display driver module need be adopted in its display part, thus the cost costliness, and have cost costliness, the complicated numerous shortcoming of adjunct circuit.

[summary of the invention]

Technical problem to be solved in the utility model is to overcome existing defective in the above-mentioned prior art, provides a kind of and can simplify circuit, saves cost, with lower cost and simplify circuit and reach the test purpose cable tester suitable with prior art.

The utility model has adopted following technical proposal to solve its technical matters: a kind of cable tester, it is characterized in that: comprise four single-chip controller U1 of a built-in liquid crystal display driver module, the signal I/O end of these four single-chip controller U1 is connected with two test jacks 1,2 respectively; Its signal input part also connects a button S2 who is used to set this circuit working state, and the other end of this button S2 is connected to power supply 8 negative poles; It shows that output terminal directly is connected with LCDs 3; Its liquid crystal display expansion control end is connected with a liquid crystal display expanded circuit 4; Its crystal oscillator input end is connected with a crystal oscillating circuit 5 with the crystal oscillator output terminal; Other has a low electro-detection chip U2 and a backlight control chip U3 and chip controller U1 to constitute a low power detection circuit 6 and a LCD backlight circuit 7.

The utility model has adopted four single-chip controllers of built-in liquid crystal display driver module, and test channel relies on controller input, output pin to send and received signal, determines the basic physical property of cable to be measured, as connection, open circuit, short circuit or the like.The LCDs that is directly driven by controller shows test results.

[description of drawings]

Fig. 1 is the utility model structure block diagram;

Fig. 2 is the utility model electrical schematic diagram.

[embodiment]

The utility model will be further described below in conjunction with embodiment and accompanying drawing.

With reference to Fig. 1, the utility model comprises four single-chip controller U1 of a built-in liquid crystal display driver module, and the signal I/O end of these four single-chip controller U1 is connected with two test jacks 1,2 respectively; Its signal input part also connects one and is used to set the button S2 that this circuit working state is the audio frequency transmit status; It shows that output terminal directly is connected with LCDs 3; Its liquid crystal display expansion control end is connected with a liquid crystal display expanded circuit 4; Its crystal oscillator input end is connected with a crystal oscillating circuit 5 with the crystal oscillator output terminal; Other has a low electro-detection chip U2 and a backlight control chip U3 and chip controller U1 to constitute a low power detection circuit 6 and a LCD backlight circuit 7.

With reference to Fig. 2, I/O pin P00---P07, P20, the P21 of four single-chip controller U1 that the utility model adopts are signal sending end mouth passage, and input pin P10---P17 is the receiver port passage.

Pin P00 is connected with No. 1 pin of test jack 1, and pin P01 is connected with No. 2 pins of test jack 1 ... by that analogy, pin P07 is connected with No. 8 pins of test jack 1, and pin P20, P21 are connected in parallel and are connected to No. 9 pins of test jack 1.The pin of I/O simultaneously P00---P07 is connected with power supply 8 negative poles by 8 resistance R 1, R2, R3, R4, R5, R6, R7, R8 respectively.

Pin P10 is connected with No. 1 pin of test jack 2, and pin P11 is connected with No. 2 pins of test jack 2 ... and the like, pin P17 is connected with No. 8 pins of test jack 2.Form a signal by cable under test and send receiving loop.Pin P13 also is connected to power supply 8 negative poles by button S2 simultaneously, and the effect of button S2 is to set this circuit working state.

The VDD pin of four single-chip controller U1 is connected with power supply 8 anodal VDD, and the VSS pin is connected with power supply 8 negative pole GND.

The pin XIN1 of four single-chip controller U1 is the crystal oscillator input port, and pin XOUT1 is the crystal oscillator output port, and pin XIN1 is connected with crystal oscillating circuit 5 with pin XOUT1.Crystal oscillator OSC and capacitor C 5 and C6 constitute crystal oscillating circuit 5, suitable oscillator signal are provided for four single-chip controller U1.Wherein, pin XIN1 is connected with an end of capacitor C 5, is connected with the end of crystal oscillator OSC simultaneously, and pin XOUT1 is connected with an end of capacitor C 6, is connected with the other end of crystal oscillator OSC simultaneously, and capacitor C 5 connects capacitor C 6 and connects power supply 8 negative poles.

The COMO---COM3 pin of four single-chip controller U1 and SEGO---SEG21 pin are for showing output pin, the COMO---COM3 pin directly is connected with LCDs 3 input pin COMO---COM3, the SEGO---SEG21 pin directly is connected with LCDs 3 input pin SEGO---SEG21, form a display output circuit, directly drive LCDs 3, to show test results.

FILT3, the FILT2 of four single-chip controller U1, FILT1, DD1, DD2 pin are liquid crystal display expansion control pin.Capacitor C 1, C2, C3, C4 constitute liquid crystal display expanded circuit 4.Pin FILT3 is connected to power supply 8 positive poles, connects power supply 8 negative poles by capacitor C 1 again, and pin FILT2 connects power supply 8 negative poles by capacitor C 2, and pin FILT1 connects power supply 8 negative poles by capacitor C 3, and pin DD1 is connected with pin DD2 by capacitor C 4.

Other has low electro-detection chip U2, backlight control chip U3 and four single-chip controller U1 to constitute low power detection circuit 6 and LCD backlight circuit 7, can send prompting to the operator by light emitting diode D1 when power supply 8 electric weight are not enough.

Wherein, the pin VDD of low electro-detection chip U2 and 8 anodal connections of power supply, pin GND is connected with power supply 8 negative poles, pin OUT is connected with the negative pole of light emitting diode D1 and is connected with the pin 1 of backlight control chip U3, the positive pole of light emitting diode D1 and 8 anodal connections of power supply, the pin 2 of backlight control chip U3 is connected with the end of button S3, and the other end of this button S3 is connected with power supply 8 negative poles, the pin 3 of backlight control chip U3 is connected with power supply 8 negative poles, pin 4 and 8 anodal connections of power supply.

Output signal makes work backlight when power supply is lower than certain voltage value, thus prompting user electric quantity of power supply deficiency.When supply voltage VDD was lower than certain voltage value, the pin 1 of low electro-detection chip U2 transferred low level to by high level and lights light emitting diode D1.

Backlight control chip U3 provides trigger pip to work by switch S 3, and its pin 1 produces low level makes light emitting diode D1 work luminous, thereby closes backlight through back pin 1 recovery high level after a while.

LCDs 3 is backlight can start working under three kinds of situations:

1) it is backlight that this tester provides a button control LCDs 3, and when button was pressed, LCD backlight was started working, about 10 seconds backlight the closing in the left and right sides.

LCD backlight was started working automatically when 2) this tester start energising was in holding state, closed automatically in about about 10 seconds.

3) when low electro-detection monitoring control devices to power supply 8 electricity shortages, just can export control signal the LCD backlight execution work is shut down until the user.

The utility model power supply 8 adopts the AAA battery to make power supply, and directly controls total system running energy-saving scheme with controller:

Anode is delivered to controller VDD through the

2,3 one tunnel of switch S 1 during start, and low electro-detection chip U2VCC, backlight control chip U3VCC are delivered in another road.Battery is stopped power supply when the pin 1,3 of switch S 1 connects, and pin 3 is short-circuited to power supply 8 negative poles.This machine is by controller control total system running energy-saving scheme, and the liquid crystal display scheme can be shut down automatically, realizes low energy expenditure.

In controller inside, adopted the fully energy-conservation scheme of total system that can allow, cooperate periphery circuit design, the minimum power consumption electric current of total system reaches below 0.1 milliampere, has utilized the energy fully.

Below working method of the present utility model is sketched:

1, single machine test cable two ends annexation is judged

This tester requires the cable two ends to be connected to the test jack 1 and the test jack 2 of tester itself when single machine test.I/O pin P00---P07, P20, the P21 of U1 is test signal transmit port passage during test, input pin P10---P17 is a test signal receiving port passage, nine line two ends of the respectively corresponding cable inside of testing, thus signal transmission/receiving loop formed.The pin of I/O simultaneously P00---P07 connects power supply 8 negative poles by 8 resistance (being followed successively by R1---R8).Cable one end is inserted local test socket 1, and the other end inserts test jack 2, this machine automatically to cable open a way, short circuit, annexation or the like detect.Signal is sent to test jack 2 to test jack 1 by cable from I/O pin P00---P07, P20, P21 and arrives input pin P10---P17.

For example: transmit port is sent test signal on the P01 pin, and this signal is received on the P13 pin, inner No. 2 lines of cable and No. 4 line connection errors are described, if sent that any pin of signal receiving end does not all receive this signal then line open circuit that the cable inside that this pin of transmitting terminal connects is described at the transmitting terminal pin, if the transmitting terminal pin has sent signal and detect this signal on a plurality of pins of receiving end, illustrate that then there is short-circuit conditions in cable inside.

For the Category-5 twisted pair of calibration tape shielding, this tester sends signal at transmitting terminal by independent two I/O pin P20 and P21, in the multiplexing input pin P11 of receiving end received signal.

2, two-shipper test cable two ends annexation is judged

With two same machines, setting one by switch S 2 is main frame, another is a slave, (main frame is test jack 1 by the defined port, slave is test jack 1) plug (requiring institute's connection cable to have two connections at least) behind the cable, the test jack 1 of main frame is connected to the test jack 1 of slave by cable, main, after slave is communicated with by handshake automatically, console controller sends test massage from I/O pin P00---P07, P20, P21 delivers to from machine controller I/O pin P00---P07 after test jack 1 arrives slave test jack 1 by cable, P20, P21, on the contrary, also send test massage from I/O pin P00---P07 from machine controller, P20, P21 delivers to console controller I/O pin P00---P07 after the test jack 1 of slave arrives host test socket 1 by cable, P20, P21, both sides obtain test result, by controller test result data are presented at respectively on the LCDs 3 of two machines again.

3, audio frequency sends

Send optional network specific digit audio modulation signal function.Be set at the audio frequency transmit status by switch S 2 under the unit state, optional network specific digit audio modulation signal by the controller generation, deliver to test jack 1 again by cable transmission to be measured by I/O pin P00---P07, the signal that is sent closely can be launched with the radio signal form through cable, can demodulate the sound signal of pleasant audible by the private radio detuner, be used for the artificial position of sunkening cord of seeking.

Claims

1, a kind of cable tester is characterized in that: comprise four single-chip controllers (U1) of a built-in liquid crystal display driver module, the signal I/O end of these four single-chip controllers (U1) is connected with two test jacks (1,2) respectively; Its signal input part also connects one and is used to set the button (S2) that this circuit working state is, the other end of this button (S2) is connected to power supply (8) negative pole; It shows that output terminal directly is connected with LCDs (3); Its liquid crystal display expansion control end is connected with a liquid crystal display expanded circuit (4); Its crystal oscillator input end is connected with a crystal oscillating circuit (5) with the crystal oscillator output terminal; Other has a low electro-detection chip (U2) and a backlight control chip (U3) to constitute a low power detection circuit (6) and a LCD backlight circuit (7) with chip controller (U1).

2, a kind of cable tester according to claim 1 is characterized in that: the input end of described four single-chip controllers (U1) also is connected with power supply (8) negative pole by resistance (R1, R2, R3, R4, R5, R6, R7, R8).

3, a kind of cable tester according to claim 1 is characterized in that: described liquid crystal display expanded circuit (4) is made of electric capacity (C1, C2, C3, C4).

4, a kind of cable tester according to claim 1, it is characterized in that: described low power detection circuit (6) comprises a low electro-detection chip (U2), described LCD backlight circuit (7) comprises a backlight control chip (U3), the pin (VDD) of low electro-detection chip (U2) is connected with power supply (8) is anodal, pin (GND) is connected with power supply (8) negative pole, pin (OUT) is connected with the negative pole of light emitting diode (D1), and be connected with backlight control chip (U3) pin (1), the positive pole of light emitting diode (D1) is connected with power supply (8) is anodal, the pin (2) of backlight control chip (U3) is connected with an end of button (S3), the other end of this button (S3) is connected with power supply (8) negative pole, the pin (3) of backlight control chip (U3) is connected with power supply (8) negative pole, and pin (4) is connected with power supply (8) is anodal.