CN2195756Y - Temperature-measuring device of intelligent fast-measuring microhm meter - Google Patents

Abstract

The utility model relates to a temperature-measuring device of intelligent fast-measuring microhm meter, which is a measuring instrument matched with an intelligent fast detecting microohmmeter. Two temperature probes for measuring are switched by a transfer switch and are connected with a processed circuit AD< 595 > which is provided with an amplifier and a cold junction compensation. The output end of the AD< 595 > is connected with an ultrathin LCD digital voltmeter SDP-100-03 which collects an A/D converter, a seven-segment display decoder and a 3< 1/2 > value liquid crystal display as integration, and the output end can also be connected with a printer. When measures microresistor, the utility model can accurately display the environment and the temperature in the machine, the utility model has clear digital display, wide measurement range, accurate precision and easy use.

Description

Temperature-measuring device of intelligent fast-measuring microhm meter

The utility model relates to the temperature measuring equipment that intelligence speed is surveyed microhmmeter, is that a kind of and intelligent speed is surveyed the measurement instrument that microhmmeter mates, and is specifically designed to the measurement instrument of measurement microhmmeter machine internal and external temperature, also is used for other thermometric and uses.

Surveying fast in the instrument of microhmmeter, very high during because of micrometer Europe resistance to the environment temperature requirement, need know temperature variation and environment temperature in the machine, be used for the detected temperatures coefficient, and present special temperature survey instrument is unsuitable for measuring in this case specially.

The purpose of this utility model is: designs a kind of new temperature measuring equipment, both can survey the temperature in the microhmmeter casing, but measures ambient temperature again.

Scheme of the present utility model is as follows: two temperature sensing probes are respectively applied for to be measured in the microhmmeter shell and environment temperature, by the switch changing-over, temperature sensor and be that the treatment circuit of core joins with the amplifier, in treatment circuit, give and use earlier laser calibration, make its coupling to used thermocouple characteristic, make precision reach ± 1 ℃.The output terminal of treatment circuit and A/D converter, 7 sections display decoders, LCD are joined, make easy to use, measurement range is wide, the temperature measuring equipment of clear display.

The use because the utility model and speed survey microhmmeter match is provided reference number therefore can accurately for the measuring accuracy of microhmmeter, and can be done other temperature survey and use, and makes the temperature that volume is little, easy to use, demonstration is eye-catching, precision is high specially and surveys instrument.

Below in conjunction with accompanying drawing the utility model is illustrated:

Fig. 1 is the utility model wiring diagram.

Shell figure when Fig. 2 connects with intelligent and intelligent microhmmeter for the utility model.

Temp probe B is installed on the coverboard, and in order to measures ambient temperature, temp probe A is contained in the casing, in order to measure the temperature in the casing.Switch SK pops one's head in order to changing-over, with cover treatment circuit, a display device measure in the shell, environment temperature.Two temp probes of the present utility model (A), (B) all available nickel chromium triangle one nisiloy thermocouple, treatment circuit I1 adopts the integrated circuit AD595 of cold junction band compensation, the pin of this integrated circuit (2), (6) can be as temperature compensation and freezing point benchmark, just work after inserting input in circuit (3), (5).And on chip, carry amplifying circuit.Given simultaneously earlier the characteristic coupling that makes its and this type thermocouple with laser calibration, made its measuring accuracy be ± 1 ℃, the voltage range broad of AD595, within+the 5V-+30V, the pass of the dut temperature and the pressure that goes out to transmit electricity is 10mv/ ℃.Use A/D converter, 7 sections display decoders, 31/2 LCD collection ultrathin LCD digital voltmeter SDP-100-03 all over the body, this watchband has auto polarity to differentiate and the radix point walking circuit, and output is also joined with printer, in the measurement output of microhmmeter, can significantly mark temperature in measures ambient temperature and the shell simultaneously.

Fig. 2 is the coverboard figure of microhmmeter.As shown in the figure, (8) are temp probe (A).(9) be temperature display device; (10) be the printer output window; (11) be the operation keyboard of microhmmeter; (12) be the resistance display window of microhmmeter; Q1, Q2, Q3, Q4 are range switch; (13) insert seat for measured resistance; Other slightly ...

Claims (1)

1, intelligence speed is surveyed the temperature measuring equipment of microhmmeter, with intelligent microhmmeter coupling, have two temperature sensor probes (A), (B) and switch SK, it is characterized in that one of its temperature sensor A is installed in intelligence speed and surveys in the casing of microhmmeter, another temperature sensor B is installed on the microhmmeter coverboard, the said temperature sensors A, B joins with two input ends that have the treatment circuit I1 of amplifier, the above-mentioned treatment circuit I1 that has amplifier one has the integrated circuit AD595 of cold junction compensation, the output terminal of I1 and collection A/D converter, 7 sections decoding monitors, three kinds of functions of 31/2 LCD LCD digital voltmeter SDP-100-03 joins.

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