CN109443599A - A kind of marine diesel thermal resistance automatic measurement system and measurement method - Google Patents
A kind of marine diesel thermal resistance automatic measurement system and measurement method Download PDFInfo
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- CN109443599A CN109443599A CN201811404959.6A CN201811404959A CN109443599A CN 109443599 A CN109443599 A CN 109443599A CN 201811404959 A CN201811404959 A CN 201811404959A CN 109443599 A CN109443599 A CN 109443599A
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- 238000005259 measurement Methods 0.000 title claims abstract description 59
- 238000000691 measurement method Methods 0.000 title description 4
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims abstract description 86
- 238000012360 testing method Methods 0.000 claims abstract description 73
- 238000012546 transfer Methods 0.000 claims abstract description 49
- 229910052697 platinum Inorganic materials 0.000 claims abstract description 43
- 238000000034 method Methods 0.000 claims abstract description 27
- 238000001514 detection method Methods 0.000 claims abstract description 22
- 238000007689 inspection Methods 0.000 claims description 12
- 230000005619 thermoelectricity Effects 0.000 claims description 12
- 238000010276 construction Methods 0.000 claims description 9
- 230000008569 process Effects 0.000 claims description 9
- 238000012795 verification Methods 0.000 claims description 9
- 238000004891 communication Methods 0.000 claims description 5
- 230000001681 protective effect Effects 0.000 claims description 4
- 238000005070 sampling Methods 0.000 claims description 4
- 230000005611 electricity Effects 0.000 claims description 3
- 238000007639 printing Methods 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 230000008859 change Effects 0.000 abstract description 2
- 108091006146 Channels Proteins 0.000 description 45
- 238000009529 body temperature measurement Methods 0.000 description 6
- 238000013461 design Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 101000746134 Homo sapiens DNA endonuclease RBBP8 Proteins 0.000 description 1
- 101000969031 Homo sapiens Nuclear protein 1 Proteins 0.000 description 1
- 102100021133 Nuclear protein 1 Human genes 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K15/00—Testing or calibrating of thermometers
- G01K15/007—Testing
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
The present invention provides a kind of marine diesel thermal resistance automatic measurement system, tested thermal resistance and standard platinum resistance are examined and determine dedicated testing wire by thermal resistance respectively and are connect with thermal resistance wiring automatic transfer equipment；Thermal resistance wiring automatic transfer equipment is connected with low potential scanning switch, and low potential scanning switch is connected with digital multimeter, and thermal resistance signal is exported by low potential scanning switch to digital multimeter；Computer is connected with digital multimeter and low potential scanning switch respectively, controls low potential scanning switch change detection channel, communicates the measurement end of digital multimeter with corresponding test point circuit；It controls digital multimeter and carries out thermoelectrical potential measurement, and send the thermoelectrical potential value measured back to computer；Measuring resistance corrects benchmark as constant current, is connected with thermal resistance wiring automatic transfer equipment.A kind of marine diesel thermal resistance method for automatic measurement is provided simultaneously.The present invention have the advantages that structure it is simple, using easy, low in cost, precise and high efficiency.
Description
Technical field
The present invention relates to marine diesel thermal resistance temperature sensor indicating value accuracy detection technique fields specifically to relate to
And a kind of marine diesel thermal resistance automatic measurement system and measurement method.
Background technique
Marine diesel thermal resistance temperature sensor is that the monitoring of low-temperature space operating condition and control are normal in ship power system
Temperature sensor.Thermistor Temperature Measurement be based on metallic conductor fuel factor, i.e., metallic resistance body resistance value as the temperature increases and
Increase this characteristic to carry out temperature measurement, multi-purpose pure metal material is made.What application was most at present is copper and platinum, wherein platinum
The measurement accuracy of thermal resistance be it is highest, be not only applicable to operating condition monitoring measurement, and can be used as temperature standard utensil
It is detected for thermal resistance sensor indicating value accuracy peculiar to vessel.
Thermal resistance is the primary element for converting temperature variation to resistance change, and resistance signal needs to pass by lead
It is delivered to temperature control system or secondary meter.In view of lead line is hindered to temperature measurement result bring error, according to thermometric in
Diesel engine installation thermal resistance is designed as three kinds of two-wire system, three-wire system and four-wire system wire modes by precision requirement.Wherein two
Line mode of connection causes the error of measurement result larger because that can not reject two lead resistances.Three-wire system wiring in practical application
Method is more typical.This method increases compensating wire and is used to reject brought into the temperature measurement error of lead line resistance, but is surveyed using which
Thermal resistance value is still needed by measuring to obtain indirectly when warm, and measurement accuracy is still not so good as four-wire system mode of connection；Four-wire system is
The ideal Thermistor Temperature Measurement mode of connection calculates heat by directly measuring the constant current for flowing through thermal resistance and thermal resistance both end voltage drop
Resistance value is not influenced by lead line resistance, therefore its accuracy of measurement is most outstanding in three kinds of modes of connection.When standard platinum resistance is made
When detecting for temperature standard utensil for the accuracy of working sensor indicating value, the four-wire system mode of connection is generallyd use to guarantee essence
Degree.
When marine diesel thermal resistance temperature sensor implements batch ware-house-in inspection at present, inspector uses handheld digital
Multimeter is made contact by branch directly measurement thermal resistance resistance value, and lacking the auxiliary detection of dedicated test tooling causes measurement data frequently to be jumped
It is dynamic, accurate recognition lead resistance error originated from input component is not simply failed to, and testing staff more needs close to high-temperature area operation, working efficiency bottom
Down and there are security risks.
Summary of the invention
Aiming at the above shortcomings existing in the prior art, the object of the present invention is to provide a kind of marine diesel thermal resistances
Automatic measurement system and measurement method are solved by marine diesel thermal resistance automatic measurement system without special measurement wiring work
Dress needs the problem of measuring of manually making contact, and improves detection efficiency and accuracy, reduces temperature measurement error.
The present invention is achieved by the following technical solutions.
According to an aspect of the invention, there is provided a kind of marine diesel thermal resistance automatic measurement system, comprising: calculate
Machine, digital multimeter, low potential scanning switch, thermal resistance wiring automatic transfer equipment, standard platinum resistance, measuring resistance and heat
Resistance examines and determine dedicated testing wire；Wherein:
Tested thermal resistance and the standard platinum resistance examine and determine dedicated testing wire and thermal resistance wiring certainly by thermal resistance respectively
The binding post of turn changing device connects；
The thermal resistance wiring automatic transfer equipment is connected with low potential scanning switch, the low potential scanning switch with
Digital multimeter is connected, and thermal resistance signal is exported by low potential scanning switch to digital multimeter；
The computer is connected with digital multimeter and low potential scanning switch respectively, and control low potential scanning switch is cut
Sense channel is changed, communicates the measurement end of digital multimeter with corresponding test point circuit；It controls digital multimeter and carries out thermoelectricity
Gesture measurement, and send the thermoelectrical potential value measured back to computer；
The measuring resistance corrects benchmark as constant current, is connected with thermal resistance wiring automatic transfer equipment.
Preferably, the thermal resistance wiring automatic transfer equipment includes standard channel and tested channel, the standard channel
It include 1# binding post, 2# binding post, 3# binding post and 4# binding post, the thermal resistance wiring automatic conversion dress with tested channel
It sets with two-wire system data acquisition scheme, three-wire system data acquisition scheme and/or four-wire system data acquisition scheme；
Wherein:
4 terminals of standard platinum resistance examine and determine dedicated testing wire by 4 thermal resistances and are sequentially connected to thermal resistance wiring
On the 1# binding post of automatic transfer equipment standard channel, 2# binding post, 3# binding post and 4# binding post；
When tested thermal resistance is two-wire system wiring construction, using two-wire system data acquisition scheme, it is detected two-wire system thermoelectricity
It respectively draws 2 thermal resistance calibrating dedicated testing wires and is sequentially connected to the tested channel of thermal resistance wiring automatic transfer equipment in the both ends of resistance
1# binding post and 2# binding post on, and start " acquisition of two-wire system data " function；
When tested thermal resistance is three-wire system wiring construction, using three-wire system data acquisition scheme, it is detected three-wire system thermoelectricity
3 terminals of resistance are sequentially connected to thermal resistance wiring automatic transfer equipment by 3 thermal resistances calibrating dedicated testing wires and are detected
On the 1# binding post in channel, 2# binding post and 3# binding post, and start " acquisition of three-wire system data " function；
When tested thermal resistance is four-wire system wiring construction, using four-wire system data acquisition scheme, it is detected four-wire system thermoelectricity
4 terminals of resistance are sequentially connected to thermal resistance wiring automatic transfer equipment by 4 thermal resistances calibrating dedicated testing wires and are detected
On the 1# binding post in channel, 2# binding post, 3# binding post and 4# binding post, and start " acquisition of four-wire system data " function.
Preferably, the digital multimeter uses six Semi-digital multimeters.
Preferably, the computer includes test module, the test module respectively with low potential scanning switch and number
Multimeter is connected, and potential data surveyed to digital multimeter sample, and controls the switching to low potential scanning switch.
Preferably, the test module built-in testing software.
Preferably, it is connected between the digital multimeter and computer by RS-232 serial port communication.
Preferably, the allocation of computer has dedicated signal lines, and one end of the dedicated signal lines and computer COM2 go here and there
Mouth is connected, and the other end of the dedicated signal lines is connected with the RS-232 socket of low potential scanning switch, realizes computer
Signal between low potential scanning switch is connect.
Preferably, the low potential scanning switch is internally provided with mainly by the miniature relay group of multiple low-heat potentials
At multiple spot switching circuit, be provided on the front panel of the low potential scanning switch to be attracted with multiple spot switching circuit and connect
Switching push button, the 12 access detection signals input for signal input is provided on the rear panel of the low potential scanning switch
Port, for export each channel numerical value to digital multimeter voltage link port, be used for and computer RS-232 rs 232 serial interface signal
The RS232 socket of connection, the Iout current output unit part for providing electric current output and the Power for inputting external power supply
Socket；It is controlled and is connected by signal path between the multiple spot switching circuit and computer.
Preferably, the outside of the low potential scanning switch is additionally provided with display unit, and the display unit is for showing
Signal path switching state between computer and multiple spot switching circuit.
Preferably, the 12 access detection signal input port includes 1~No. 12 port, wherein it is logical that No. 1 port corresponds to C
Road, i.e. short circuit channel；No. 2 ports correspond to N channel, that is, connect the channel of measuring resistance；No. 3 ports correspond to the channel E, that is, connect standard platinum
The channel of resistance；4~No. 12 ports correspond to 1~No. 10 tested channel of thermal resistance wiring automatic transfer equipment, that is, pass through thermoelectricity
Hinder the channel that wiring automatic transfer equipment connects tested thermal resistance.
Preferably, the measuring resistance is 100 Ω.
Preferably, further include following any one or any multinomial feature:
Stabilized current supply built in the Iout current output unit part provides the output of 1mA electric current；
1A protective tube built in the Power socket.
It preferably, further include examining and determine thermostat, under working condition, standard platinum resistance and tested thermal resistance are inserted along casing respectively
Enter to examine and determine thermostat.
According to another aspect of the present invention, a kind of marine diesel thermal resistance method for automatic measurement is provided, including such as
Lower step:
Standard platinum resistance and tested thermal resistance are inserted into calibrating thermostat along casing respectively, and make standard platinum by step S1
The temperature-sensitive head of resistance and tested thermal resistance is on same section；
Step S2, standard platinum resistance are respectively led into thermal resistance by thermal resistance calibrating dedicated testing wire with tested thermal resistance and connect
The tested binding post of line automatic transfer equipment selects the line data acquisition scheme of thermal resistance wiring automatic transfer equipment and keeps
Room temperature is constant；
Step S3 opens the test module of computer, after typing is detected thermal resistance information and inspection setpoint information, starting test
Program；
The instruction of test module is automatically accepted in step S4, low potential scanning switch, switches thermoelectricity by voltage method calibrating requirement
Each tested channel for hindering wiring automatic transfer equipment, communicates the measurement end of digital multimeter with corresponding calibrating point circuit, number
Word multimeter is instructed according to test module to carry out thermoelectrical potential measurement and the thermoelectrical potential value measured is sent back to computer.
Preferably, step S4 specifically:
Computer controls the switch operating of low potential scanning switch and the data sampling work of digital multimeter, according to number
The standard platinum resistance voltage value that multimeter measures converses current constant temperature field temperature, stably reaches the inspection of certain set temperature in temperature
When fixed point requires, test module controls the touring tangential standard platinum resistance of low potential scanning switch and tested thermal resistance, every switching one
Road, digital multimeter just measure the thermoelectrical potential in the circuit and the thermoelectrical potential signal value surveyed are sent to computer storage for use；
It is finished when the calibrating point detects as required, the next calibrating point of test module auto-steering；Until the calibrating point temperature of all settings
Degree all detections finish.
Preferably, in verification process, permanent steady current value is corrected repeatedly by measuring resistance, to ensure measurement accuracy.
Preferably, further include following steps:
Step S5, test module do calibration calculation by the requirement of vertification regulation, then arrange verification result and are recorded in solid
In the measurement record and data consolidated statement of the formula that fixes, user can call at any time all calibrating reports in test module, check
And/or printing.
Compared with prior art, the invention has the following beneficial effects:
Marine diesel thermal resistance automatic measurement system provided by the invention is a kind of marine diesel resistance and temperature biography
The Special Automatic detection system of sensor, it is poor according to various marine diesel thermometric thermal resistance sensor scale division value number and wire gages
It is flexibly easily led brought by autosensing mode and multi-mode wiring the automatic transfer equipment design that different selection need to enter
Line connection type, it is accurate in various high, medium and low speed diesel engine thermometric thermal resistance sensor indicating value to be used cooperatively with various thermostat
Degree detection, improves board instrument ware-house-in inspection working efficiency and accuracy.
Marine diesel thermal resistance automatic measurement system provided by the invention, have structure it is simple, using easy, at low cost
The advantages of honest and clean, precise and high efficiency.
Marine diesel thermal resistance automatic measurement system provided by the invention, system design meet JJG1098-2003 " heat
Resistance, thermal resistance automatic measurement system calibrating standard ", JJG229-2010 " copper, platinum resistance vertification regulation " and JJG160-2007
" standard platinum resistance thermometer vertification regulation " is to the technical requirements of data acquisition process and corollary equipment.
Detailed description of the invention
Upon reading the detailed description of non-limiting embodiments with reference to the following drawings, other feature of the invention,
Objects and advantages will become more apparent upon:
Fig. 1 is marine diesel thermal resistance automatic measurement system theory of constitution figure；
Fig. 2 is the connection schematic diagram of marine diesel thermal resistance wiring automatic transfer equipment；
Fig. 3 is the connection schematic diagram of digital multimeter and computer；
Fig. 4 is the connection schematic diagram of scanning switch and computer；
Fig. 5 is dedicated low potential scanning switch operation principle schematic diagram；
Fig. 6 is dedicated low potential scanning switch rear panel figure.
Specific embodiment
Elaborate below to the embodiment of the present invention: the present embodiment carries out under the premise of the technical scheme of the present invention
Implement, the detailed implementation method and specific operation process are given.It should be pointed out that those skilled in the art
For, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to guarantor of the invention
Protect range.
Embodiment 1
Present embodiments provide a kind of marine diesel thermal resistance automatic measurement system, comprising: computer, number are more
It is examined and determine with table, low potential scanning switch, thermal resistance wiring automatic transfer equipment, standard platinum resistance, measuring resistance and thermal resistance
Dedicated testing wire；Wherein:
Tested thermal resistance and the standard platinum resistance examine and determine dedicated testing wire and thermal resistance wiring certainly by thermal resistance respectively
Binding post (tested channel wiring column and standard channel binding post) connection of turn changing device；
The thermal resistance wiring automatic transfer equipment is connected with low potential scanning switch, the low potential scanning switch with
Digital multimeter is connected, and thermal resistance signal is exported by low potential scanning switch to digital multimeter；
The computer is connected with digital multimeter and low potential scanning switch respectively, and control low potential scanning switch is cut
Sense channel is changed, communicates the measurement end of digital multimeter with corresponding test point circuit；It controls digital multimeter and carries out thermoelectricity
Gesture measurement, and send the thermoelectrical potential value measured back to computer；
The measuring resistance corrects benchmark as constant current, is connected with thermal resistance wiring automatic transfer equipment.
Further, the thermal resistance wiring automatic transfer equipment includes standard channel and (1~No. 10) tested channel, institute
Stating standard channel and (each) tested channel includes 1# binding post, 2# binding post, 3# binding post and 4# binding post, the heat
Resistor wiring automatic transfer equipment has two-wire system data acquisition scheme, three-wire system data acquisition scheme and/or four-wire system data
Acquisition mode；
Wherein:
4 terminals of standard platinum resistance examine and determine dedicated testing wire by 4 thermal resistances and are sequentially connected to thermal resistance wiring
On the 1# binding post in automatic transfer equipment panel " standard " channel, 2# binding post, 3# binding post and 4# binding post；
When tested thermal resistance is two-wire system wiring construction, using two-wire system data acquisition scheme, it is detected two-wire system thermoelectricity
It respectively draws 2 thermal resistance calibrating dedicated testing wires and is sequentially connected to thermal resistance wiring automatic transfer equipment panel " quilt in the both ends of resistance
On the 1# binding post and 2# binding post in inspection " channel, and start " two-wire system " function button；
When tested thermal resistance is three-wire system wiring construction, using three-wire system data acquisition scheme, it is detected three-wire system thermoelectricity
3 terminals of resistance examine and determine dedicated testing wire by 3 thermal resistances and are sequentially connected to thermal resistance wiring automatic transfer equipment panel
On the 1# binding post in " tested " channel, 2# binding post and 3# binding post, and start " three-wire system " function button；
When tested thermal resistance is four-wire system wiring construction, using four-wire system data acquisition scheme, it is detected four-wire system thermoelectricity
4 terminals of resistance examine and determine dedicated testing wire by 4 thermal resistances and are sequentially connected to thermal resistance wiring automatic transfer equipment panel
On the 1# binding post in " tested " channel, 2# binding post, 3# binding post and 4# binding post, and start " four-wire system " function button.
Further, the digital multimeter uses six Semi-digital multimeters.
Further, the computer includes test module, the test module respectively with low potential scanning switch sum number
Word multimeter is connected, and potential data surveyed to digital multimeter sample, and carries out to the switching of low potential scanning switch
Control.
Further, the test module built-in testing software.
Further, it is connected between the digital multimeter and computer by RS-232 serial port communication.
Further, the allocation of computer has dedicated signal lines, one end of the dedicated signal lines and computer COM2
Serial ports is connected, and the other end of the dedicated signal lines is connected with the RS-232 socket of low potential scanning switch, realizes and calculates
Signal connection between machine and low potential scanning switch.
Further, the low potential scanning switch is internally provided with mainly by the miniature relay of multiple low-heat potentials
The multiple spot switching circuit of composition, is provided on the front panel of the low potential scanning switch to be attracted with multiple spot switching circuit and connects
The switching push button connect is provided on the rear panel of the low potential scanning switch defeated for 12 access detection signals of signal input
Inbound port, for export each channel numerical value to digital multimeter voltage link port, be used for and computer RS-232 serial ports believe
Number connection RS232 socket, for provide electric current output Iout current output unit part and for inputting external power supply
Power socket；It is controlled and is connected by signal path between the multiple spot switching circuit and computer.
Further, the outside of the low potential scanning switch is additionally provided with display unit, and the display unit is for showing
Show the signal path switching state between computer and multiple spot switching circuit.
Further, the 12 access detection signal input port includes 1~No. 12 port, wherein No. 1 port corresponds to C
Channel, i.e. short circuit channel；No. 2 ports correspond to N channel, that is, connect the channel of measuring resistance；No. 3 ports correspond to the channel E, that is, connect standard
The channel of platinum resistance；4~No. 12 ports correspond to 1~No. 10 tested channel of thermal resistance wiring automatic transfer equipment, that is, pass through heat
Resistor wiring automatic transfer equipment connects the channel of tested thermal resistance.
Further, the measuring resistance is 100 Ω.
Further, further include following any one or any multinomial feature:
Stabilized current supply built in the Iout current output unit part provides the output of 1mA electric current；
1A protective tube built in the Power socket.
It further, further include examining and determine thermostat, under working condition, standard platinum resistance and tested thermal resistance are respectively along casing
Insertion calibrating thermostat.
The present embodiment is further described with reference to the accompanying drawing.
As shown in Figure 1, system provided in this embodiment, based on computer, further include (six and half) digital multimeter,
(dedicated) low potential scanning switch, (marine diesel) thermal resistance wiring automatic transfer equipment, standard platinum resistance, measuring resistance,
(marine diesel) thermal resistance examines and determine dedicated testing wire.
Computer includes test module, (marine diesel thermal resistance) test software built in the test module.
(dedicated) low potential scanning switch uses single-chip microcontroller circuit control technology, and function modoularization design controls circuit
Dedicated acquisition cabinet is integrated in data acquisition.
Test module realizes the automatic detection of the setting of detection temperature, the judgement of thermal field constant temperature, detection data acquisition and processing
Function.
Measuring resistance corrects benchmark as system detection constant current.
The technical performance of system is as follows:
| Performance | Parameter index |
| Accuracy | ± (0.005Reading+0.0017Range) % |
| Resolution ratio | 0.1μV |
| Parasitic potential | ≤0.4μV |
| Switching channels | 10 tunnel, 2 line |
| Examine and determine number | Two-wire system, three-wire system, four-wire system 10 |
| Calibration method | Voltage method |
| Examine and determine type | Thermal resistance: Pt10, Pt100, Pt1000, Cu10, Cu100 Graduation Number |
| Temperature range | (0-250)℃ |
| Stability | ≤0.04℃/10min |
Specific implementation process:
1) it is detected the connection of thermal resistance, standard hot resistance and thermal resistance wiring automatic transfer equipment.
Every four-wire system thermal resistance both ends examine and determine dedicated testing wire by 4 thermal resistances and are respectively led into tested binding post, connect
Line mode as shown in Fig. 2, specifically: on standard hot resistance or tested four-wire system thermal resistance terminal box press 1#-4# tactic 4
A terminals examine and determine dedicated testing wire by 4 thermal resistances and are sequentially connected on thermal resistance wiring automatic transfer equipment panel " mark
In standard " or the corresponding 1# binding post in " tested " channel, 2# binding post, 3# binding post and 4# binding post, and start " four-wire system " function
It can button.Thermal resistance signal is exported by low potential scanning switch to high accuracy number multimeter；Two wires thermal resistance and standard
The platinum resistance mode of connection is the same as four-wire system thermal resistance；Three-wire system thermal resistance connects 1#, 2#, 3# binding post.When actually detected, according to tested
Thermal resistance specification selects two-wire system, three-wire system, four-wire system data acquisition scheme on thermal resistance wiring automatic transfer equipment panel
Button.
2) line between computer and digital multimeter.
Communication between high-precision digital multimeter and computer is connected by RS-232 serial line interface, as shown in Figure 3.
Marine diesel thermal resistance automatic measurement system provides that the communication interface of digital multimeter is connected with computer COM port or COM device or COM1, control
Cable and connector special configuration.
3) connection between computer and dedicated low potential scanning switch.
The serial ports COM2 of computer, configures dedicated signal lines, on the other end and dedicated low potential scanning switch rear panel
RS-232 socket connection, as shown in figure 4, completing the signal connection between computer and low potential scanning switch.
4) dedicated low potential scanning switch design.
In order to realize that measured signal is automatically switched and measurement commutates and measuring point is shorted, dedicated low potential scanning switch is provided with
The miniature relay of more than ten of low-heat potential constitutes multiple spot switching circuit, when needing manual switching, can be scanned by operation
Switching touch button on switch front panel controls the actuation of corresponding relay.When requiring to automatically switch, it is automatically brought into operation circuit
The corresponding actuating of relay can be controlled according to the control signal of computer.In addition, manual/auto operation mode can by switch come
Switching, signal path switching state is by numeral method.
Rear panel such as Fig. 6 of dedicated low potential scanning switch, the label of socket are respectively described below:
12 access detection signal input ports: signal input part, from " 1~12 ", wherein 1 corresponds to C-channel (short circuit), 2 pairs
It answers N channel (connecing 100 Ω measuring resistances), the 3 corresponding channel E (connecing secondary standard thermal resistance), 4-12 corresponds to the tested channel 1-10 and (connects
Tested thermal resistance).
Voltage link port: refer to that each channel value can connect digital multimeter by terminals output.
RS-232 socket: computer auto-detection control interface is connected with computer RS-232 serial ports.
Iout current output unit part: built-in stabilized current supply provides the output of 1mA electric current.
Power socket: input power~220V ± 10%, built-in 1A protective tube.
Embodiment 2
A kind of marine diesel thermal resistance method for automatic measurement is present embodiments provided, can be provided using embodiment 1
Marine diesel thermal resistance automatic measurement system executes, and includes the following steps:
Standard platinum resistance and tested thermal resistance are inserted into calibrating thermostat along casing respectively, and make standard platinum by step S1
The temperature-sensitive head of resistance and tested thermal resistance is on same section；
Step S2, standard platinum resistance are respectively led into thermal resistance by thermal resistance calibrating dedicated testing wire with tested thermal resistance and connect
The tested binding post of line automatic transfer equipment selects the line data acquisition scheme of thermal resistance wiring automatic transfer equipment and keeps
Room temperature is constant；
Step S3 opens the test module of computer, after typing is detected thermal resistance information and inspection setpoint information, starting test
Program；
The instruction of test module is automatically accepted in step S4, low potential scanning switch, switches thermoelectricity by voltage method calibrating requirement
Each tested channel for hindering wiring automatic transfer equipment, communicates the measurement end of digital multimeter with corresponding calibrating point circuit, number
Word multimeter is instructed according to test module to carry out thermoelectrical potential measurement and the thermoelectrical potential value measured is sent back to computer.
Further, step S4 specifically:
Computer controls the switch operating of low potential scanning switch and the data sampling work of digital multimeter, according to number
The standard platinum resistance voltage value that multimeter measures converses current constant temperature field temperature, stably reaches the inspection of certain set temperature in temperature
When fixed point requires, test module controls the touring tangential standard platinum resistance of low potential scanning switch and tested thermal resistance, every switching one
Road, digital multimeter just measure the thermoelectrical potential in the circuit and the thermoelectrical potential signal value surveyed are sent to computer storage for use；
It is finished when the calibrating point detects as required, the next calibrating point of test module auto-steering；Until the calibrating point temperature of all settings
Degree all detections finish.
Further, in verification process, permanent steady current value is corrected repeatedly by measuring resistance, accurate to ensure to measure
Property.
Further, further include following steps:
Step S5, test module do calibration calculation by the requirement of vertification regulation, then arrange verification result and are recorded in solid
In the measurement record and data consolidated statement of the formula that fixes, user can call at any time all calibrating reports in test module, check
And/or printing.
Specific implementation process are as follows:
1) thermal resistance peculiar to vessel detects automatically.
When examining and determine marine diesel thermal resistance temperature sensor, standard platinum resistance and tested thermal resistance respectively along special set
In pipe insertion calibrating thermostat, and it is in standard platinum resistance and the temperature-sensitive head of tested thermal resistance on same section.Standard platinum electricity
It hinders and tested the connecing that dedicated testing wire is respectively led into thermal resistance wiring automatic transfer equipment is examined and determine by thermal resistance with tested thermal resistance
Terminal selects the line specification (i.e. line data acquisition scheme) of thermal resistance wiring automatic transfer equipment and keeps room temperature base
This is constant.It opens test module (thermal resistance specific test and measure software), typing starts after being detected thermal resistance information and inspection setpoint information
Test program.Dedicated low potential scanning switch starts that test module instruction is automatically accepted, and switches each quilt by voltage method calibrating requirement
Channel is examined, communicates the measurement end of high accuracy number multimeter with corresponding calibrating point circuit, digital multimeter is according to test mould
Block instruction carries out thermoelectrical potential measurement and the thermoelectrical potential value measured is sent back to computer.
Test module is the controller of thermal resistance automatic Verification process, it controls low potential according to the needs of calibration operation
The switch operating of scanning switch and the data sampling work of digital multimeter, converse according to the standard platinum resistance voltage value measured
Current constant temperature field temperature, when the calibrating point that temperature stably reaches certain set temperature requires, test module controls low potential scanning
Touring tangential standard platinum resistance and tested thermal resistance are switched, all the way, high accuracy number multimeter just measures the circuit for every switching
The thermoelectrical potential signal value surveyed simultaneously is sent to computer storage for use by thermoelectrical potential, is finished, is surveyed when the calibrating point detects as required
The next temperature of die trial block auto-steering examines and determine point.Permanent steady current value is corrected repeatedly by measuring resistance with true in verification process
Protect measurement accuracy.When set temperature calibrating point all detections finish, test module is then examined and determine by the requirement of vertification regulation
It calculates, then arrange verification result and is recorded in the measurement record and data consolidated statement of fixed format, user can be in test mould
All calibrating reports are called on block at any time, checks and/or prints.
Specific embodiments of the present invention are described above.It is to be appreciated that the invention is not limited to above-mentioned
Particular implementation, those skilled in the art can make various deformations or amendments within the scope of the claims, this not shadow
Ring substantive content of the invention.
Claims (10)
1. a kind of marine diesel thermal resistance automatic measurement system characterized by comprising computer, digital multimeter, low electricity
Gesture scanning switch, thermal resistance wiring automatic transfer equipment, standard platinum resistance, measuring resistance and thermal resistance examine and determine special test
Line；Wherein:
Tested thermal resistance and the standard platinum resistance examine and determine dedicated testing wire and thermal resistance wiring from turn by thermal resistance respectively
The binding post of changing device connects；
The thermal resistance wiring automatic transfer equipment is connected with low potential scanning switch, the low potential scanning switch and number
Multimeter is connected, and thermal resistance signal is exported by low potential scanning switch to digital multimeter；
The computer is connected with digital multimeter and low potential scanning switch respectively, control low potential scanning switch switching inspection
Channel is surveyed, communicates the measurement end of digital multimeter with corresponding test point circuit；It controls digital multimeter and carries out thermoelectrical potential survey
Amount, and send the thermoelectrical potential value measured back to computer；
The measuring resistance corrects benchmark as constant current, is connected with thermal resistance wiring automatic transfer equipment.
2. a kind of marine diesel thermal resistance automatic measurement system according to claim 1, which is characterized in that the thermoelectricity
Hindering wiring automatic transfer equipment includes standard channel and tested channel, and the standard channel and tested channel include 1# wiring
Column, 2# binding post, 3# binding post and 4# binding post, the thermal resistance wiring automatic transfer equipment have two-wire system data acquisition module
Formula, three-wire system data acquisition scheme and/or four-wire system data acquisition scheme；
Wherein:
4 terminals of standard platinum resistance by 4 thermal resistances examine and determine dedicated testing wires, and to be sequentially connected to thermal resistance wiring automatic
On the 1# binding post of conversion equipment standard channel, 2# binding post, 3# binding post and 4# binding post；
When tested thermal resistance is two-wire system wiring construction, using two-wire system data acquisition scheme, it is detected two wires thermal resistance
It respectively draws 2 thermal resistance calibrating dedicated testing wires and is sequentially connected to the 1# that thermal resistance wiring automatic transfer equipment is detected channel in both ends
On binding post and 2# binding post, and start two-wire system data acquisition scheme；
When tested thermal resistance is three-wire system wiring construction, using three-wire system data acquisition scheme, it is detected the 3 of three-wire system thermal resistance
A terminals examine and determine dedicated testing wire by 3 thermal resistances and are sequentially connected to the tested channel of thermal resistance wiring automatic transfer equipment
On 1# binding post, 2# binding post and 3# binding post, and start three-wire system data acquisition scheme；
When tested thermal resistance is four-wire system wiring construction, using four-wire system data acquisition scheme, it is detected the 4 of four-wire system thermal resistance
A terminals examine and determine dedicated testing wire by 4 thermal resistances and are sequentially connected to the tested channel of thermal resistance wiring automatic transfer equipment
On 1# binding post, 2# binding post, 3# binding post and 4# binding post, and start four-wire system data acquisition scheme.
3. a kind of marine diesel thermal resistance automatic measurement system according to claim 1, which is characterized in that further include as
Lower any one or any multinomial feature:
The digital multimeter uses six Semi-digital multimeters；
It is connected between the digital multimeter and computer by RS-232 serial port communication；
The computer includes test module, and the test module is connected with low potential scanning switch and digital multimeter respectively
It connects, potential data surveyed to digital multimeter sample, and control the switching of low potential scanning switch；
The allocation of computer has dedicated signal lines, and one end of the dedicated signal lines is connected with the COM2 serial ports of computer,
The other end of the dedicated signal lines is connected with low potential scanning switch, realizes between computer and low potential scanning switch
Signal connection.
4. a kind of marine diesel thermal resistance automatic measurement system according to claim 1, which is characterized in that the low electricity
Gesture scanning switch is internally provided with the multiple spot switching circuit being mainly made of the miniature relay of multiple low-heat potentials, described low
The switching push button that connection can be attracted with multiple spot switching circuit is provided on the front panel of potential scan switch, the low potential is swept
It retouches and is provided with the 12 access detection signal input ports for signal input on the rear panel of switch, for exporting each channel numerical value
To the voltage link port of digital multimeter, the RS-232 socket for being connect with serial ports of computers signal, for providing electric current
The Iout current output unit part of output and Power socket for inputting external power supply；The multiple spot switching circuit and calculating
It is controlled and is connected by signal path between machine.
5. a kind of marine diesel thermal resistance automatic measurement system according to claim 4, which is characterized in that further include as
Lower any one or any multinomial feature:
The outside of the low potential scanning switch is additionally provided with display unit, and the display unit is for showing computer and more
Signal path switching state between point switching circuit；
The 12 access detection signal input port includes 1~No. 12 port, wherein No. 1 port corresponds to C-channel, that is, is shorted logical
Road；No. 2 ports correspond to N channel, that is, connect the channel of measuring resistance；No. 3 ports correspond to the channel E, that is, connect the channel of standard platinum resistance；
4~No. 12 ports correspond to 1~No. 10 tested channel of thermal resistance wiring automatic transfer equipment, that is, pass through thermal resistance wiring from turn
Changing device connects the channel of tested thermal resistance；
The measuring resistance is 100 Ω；
Stabilized current supply built in the Iout current output unit part provides the output of 1mA electric current；
1A protective tube built in the Power socket.
6. a kind of marine diesel thermal resistance automatic measurement system according to any one of claim 1 to 5, feature exist
In further including calibrating thermostat, under working condition, standard platinum resistance and tested thermal resistance are inserted into calibrating constant temperature along casing respectively
Slot.
7. a kind of marine diesel thermal resistance method for automatic measurement, which comprises the steps of:
Standard platinum resistance and tested thermal resistance are inserted into calibrating thermostat along casing respectively, and make standard platinum resistance by step S1
It is on same section with the temperature-sensitive head of tested thermal resistance；
Step S2, standard platinum resistance and tested thermal resistance examine and determine dedicated testing wire by thermal resistance and are respectively led into thermal resistance wiring certainly
The tested binding post of turn changing device selects the line data acquisition scheme of thermal resistance wiring automatic transfer equipment and keeps indoor
Temperature is constant；
Step S3 opens the test module of computer, after typing is detected thermal resistance information and inspection setpoint information, starting test journey
Sequence；
The instruction of test module is automatically accepted in step S4, low potential scanning switch, connects by voltage method calibrating requirement switching thermal resistance
Each tested channel of line automatic transfer equipment, communicates the measurement end of digital multimeter with corresponding calibrating point circuit, number ten thousand
Thermoelectrical potential measurement is carried out according to test module instruction with table and the thermoelectrical potential value measured is sent back to computer.
8. marine diesel thermal resistance method for automatic measurement according to claim 7, which is characterized in that step S4 is specific
Are as follows:
Computer controls the switch operating of low potential scanning switch and the data sampling work of digital multimeter, according to digital versatile
The standard platinum resistance voltage value that table measures converses current constant temperature field temperature, stably reaches the calibrating point of certain set temperature in temperature
It is required that when, test module controls the touring tangential standard platinum resistance of low potential scanning switch and tested thermal resistance, and every switching all the way, counts
Word multimeter just measures the thermoelectrical potential in the circuit and the thermoelectrical potential signal value surveyed is sent to computer storage for use；When the inspection
Detection finishes fixed point as required, the next calibrating point of test module auto-steering；Until the inspection set point temperature of all settings is all examined
Survey finishes.
9. marine diesel thermal resistance method for automatic measurement according to claim 8, which is characterized in that in verification process,
Permanent steady current value is corrected repeatedly by measuring resistance, to ensure measurement accuracy.
10. marine diesel thermal resistance method for automatic measurement according to any one of claims 7 to 9, which is characterized in that
Further include following steps:
Step S5, test module do calibration calculation by the requirement of vertification regulation, then arrange verification result and are recorded in fixed grating
In the measurement record and data consolidated statement of formula, user can call at any time all calibrating reports in test module, check and/or
Printing.
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| CN201811404959.6A CN109443599A (en) | 2018-11-23 | 2018-11-23 | A kind of marine diesel thermal resistance automatic measurement system and measurement method |
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| CN112212908A (en) * | 2020-10-10 | 2021-01-12 | 北京航空航天大学 | Intelligent sensor and intelligent method thereof |
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