CN2816817Y

CN2816817Y - Portable multiple measuring-input path isolation type detecting gauge

Info

Publication number: CN2816817Y
Application number: CN 200520031492
Authority: CN
Inventors: 杜红日
Original assignee: Individual
Current assignee: Individual
Priority date: 2005-08-11
Filing date: 2005-08-11
Publication date: 2006-09-13
Anticipated expiration: 2015-08-11

Abstract

The utility model relates to a portable multiple measuring-input path isolation type detecting gauge with multichannel voltage and phase isolation measurement, which comprises a signal conditioning circuit, an analogue-digital conversion circuit which is connected with an output end of the signal conditioning circuit through an input end, a micro processing circuit which is connected with the output end of the analogue-digital conversion circuit through the input end, a display circuit which is connected with a micro processing circuit interface, a press key circuit and a power circuit which supplies power for the integral circuit, wherein the input end of the signal conditioning circuit is connected with the output end of an input channel switching circuit, wherein the control end of which is connected with the output end of the micro processing circuit. The utility model has the advantages of good effect, simple circuit, low cost and no relay service life influence.

Description

The portable isolated test chart of input channel of measuring more

Affiliated technical field

The utility model belongs to the electrical measurement technical field, relates in particular to portable isolated test charts of input channel of measuring of a kind of multichannel voltage, electric current, impedance and phase place isolation measurement more.

Background technology

At present, existing test instrumentation has following several method to the measurement of the voltage more than two passages, phase place: (1) non-isolation input measurement.As the input of oscillographic binary channels mostly be non-isolation input, this method requires measured signal that common place is arranged, when because of carelessness oscillographic twin-channel ground terminal being connected on two different level detecting ends respectively, will cause this two terminal shortcircuit, very likely damage equipment under test; (2) non-isolating difference input measurement.Can measure the non-altogether earth signal of hyperchannel, but measured signal during voltage, is limited by common mode inhibition capacity and input range much smaller than between each signal, may influence test result, therefore the usable range of this method is restricted; (3) isolate input measurement fully.General isolated amplifier, precision photoelectric coupler or the isolating transformer of adopting isolated coupling, this method isolation effect is better, weak point is that circuit is complicated, and buffer circuit often needs to consider with bigger additional delay, seldom uses on general hand-held table.Also have in the railway signal field; often have the situation that needs certain partial circuit impedance in the test run equipment; these equipment must guarantee normal operation 24 hours every days, and it almost is impossible that this element is taken off measurement, therefore must consider the on-line measurement of impedance.

The utility model content

The utility model provides a kind of portable isolated test charts of input channels of measuring more at the testing requirement of railway signal system reality, can be to voltage, electric current, frequency, the phase test of railway signal system demand, and by to the test of voltage, electric current and phase place in the railway signals equipment circuit in service, through computing can in-situ measurement equipment in the impedance of certain circuit part.

Micro-processor interface circuit, the display circuit that is connected with the micro-processor interface circuit interface and the key circuit that the purpose of this utility model is achieved in that the analog to digital conversion circuit that comprises signal conditioning circuit, be connected with the output terminal of signal conditioning circuit by input end, be connected with the output terminal of analog to digital conversion circuit by input end, be the power circuit of entire circuit power supply, be connected with the output terminal of input channel commutation circuit on the input end of signal conditioning circuit, the control end of input channel commutation circuit is connected with the output terminal of micro-processor interface circuit.

In the input channel commutation circuit, the positive input terminal INPUT1+ of input channel one (CH1) is connected with an end of the switch terminals of photoelectric relay U1A, the other end of switch terminals is connected with the positive input terminal AN_IN of signal conditioning circuit, the negative input end INPUT1-of input channel one (CH1) is connected with an end of the switch terminals of photoelectric relay U1B, and the other end of switch terminals is connected with the negative input end A_GND of signal conditioning circuit; The positive input terminal INPUT2+ of input channel two (CH2) is connected with an end of the switch terminals of photoelectric relay U2A, the other end of switch terminals is connected with the positive input terminal AN_IN of signal conditioning circuit, the negative input end INPUT2-of input channel two (CH2) is connected with an end of the switch terminals of photoelectric relay U2B, and the other end of switch terminals is connected with the negative input end A_GND of signal conditioning circuit; The control end of photoelectric relay U1A, U1B is connected with the output terminal CNTR1 of micro-processor interface circuit by resistance R 1, R2, and the control end of photoelectric relay U2A, U2B is connected with the output terminal CNTR2 of micro-processor interface circuit by resistance R 3, R4.

It is good to the utlity model has isolation effect, and circuit is simple, and the advantage that cost is low because photoelectric relay is made up of light emitting diode and optoelectronic switch pipe, belongs to noncontacting switch, so even frequent switch does not influence serviceable life of relay.

Description of drawings

Fig. 1 is the connection diagram of test chart of the present utility model and annex current clamp, test test pencil.

Fig. 2 is the theory diagram of test chart of the present utility model.

Fig. 3 is a hyperchannel commutation circuit schematic diagram of the present utility model.

Embodiment

As shown in Figure 1, 2, 3, analog to digital conversion (AD) circuit that the utility model comprises signal conditioning circuit, be connected with the output terminal of signal conditioning circuit by input end, the micro-processor interface circuit (cpu), the display circuit that is connected with the micro-processor interface circuit interface and the key circuit that are connected with the output terminal of analog to digital conversion circuit by input end, be the power circuit of entire circuit power supply, be connected with the output terminal of input channel commutation circuit on the input end of signal conditioning circuit, the control end of input channel commutation circuit is connected with the output terminal of micro-processor interface circuit.

Claims

1, a kind of portable isolated test charts of input channel of measuring more, comprise signal conditioning circuit, the analog to digital conversion circuit that is connected with the output terminal of signal conditioning circuit by input end, the micro-processor interface circuit that is connected with the output terminal of analog to digital conversion circuit by input end, the display circuit and the key circuit that are connected with the micro-processor interface circuit interface, power circuit for the entire circuit power supply, it is characterized in that: be connected with the output terminal of input channel commutation circuit on the input end of signal conditioning circuit, the control end of input channel commutation circuit is connected with the output terminal of micro-processor interface circuit.

2, a kind of portable isolated test charts of input channel of measuring according to claim 1 more, it is characterized in that: in the input channel commutation circuit, the positive input terminal INPUT1+ of input channel one (CH1) is connected with an end of the switch terminals of photoelectric relay U1A, the other end of switch terminals is connected with the positive input terminal AN_IN of signal conditioning circuit, the negative input end INPUT1-of input channel one (CH1) is connected with an end of the switch terminals of photoelectric relay U1B, and the other end of switch terminals is connected with the negative input end A_GND of signal conditioning circuit; The positive input terminal INPUT2+ of input channel two (CH2) is connected with an end of the switch terminals of photoelectric relay U2A, the other end of switch terminals is connected with the positive input terminal AN_IN of signal conditioning circuit, the negative input end INPUT2-of input channel two (CH2) is connected with an end of the switch terminals of photoelectric relay U2B, and the other end of switch terminals is connected with the negative input end A_GND of signal conditioning circuit; The control end of photoelectric relay U1A, U1B is connected with the output terminal CNTR1 of micro-processor interface circuit by resistance R 1, R2, and the control end of photoelectric relay U2A, U2B is connected with the output terminal CNTR2 of micro-processor interface circuit by resistance R 3, R4.