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六、

Influencing factors of measurement

6.1 Temperature influence

6.1.1

Material conductivity value dependent on its temperature very well, conductivity

values decrease with the increase of temperature usually. Such as copper conductivity

values is 58.0MS/m at 20

℃

, when the temperature rises to 25

℃

, conductivity values is

56.9MS/m. Below is relationship for conductivity, temperature and temperature coefficient.

)

(

)

(

)

(







(T) : Conductivity under the temperature T

(20) :conductivity under the temperature of 20

℃

a :Temperature coefficient of material

T : Temperature of material

6.1.1.1

Temperature coefficient a may refer to Appendix 1.

6.1.1.2

A variety of temperature compensation methods are established to meet the user's

choice of different occasions based on the relationship between the conductivity value , the

temperature and the temperature coefficient of the instrument,

6.1.1.3

The conductivity can be measured accurately when select correct temperature

compensation mode and temperature coefficient.

6.1.2

Summery of the interaction between temperature compensation method, various of

methods and the material temperature coefficient, and how to measure the temperature

coefficient of unknown material.

6.1.2.1

”pseudo temperature compensation”

This is one of the most simple and efficient common modes, measurement or

calibration without taking into account the temperature value and input temperature

coefficient values, as long as meeting the following two conditions.

①

The temperature of the material to be tested shall be the same as the temperature of

the calibration test block. The instrument is calibrated with the value of standard test block

at 20

℃

, and the conductivity value of the unknown material is equal to the compensation

value at 20

℃

②

The material to be tested has the same temperature coefficient as the standard block

used for calibration.

Содержание 2008 B1

Страница 1: ...Sigma 2008B SERIAL DIGITAL CONDUCTIVITY METER OPERATING INSTRUCTIONS Xiamen Tianyan Instrument Co Ltd ...

Страница 2: ...re 9 5 3 2 6 Methods of temperature coefficient 10 5 3 2 7 Methods of curvature compensation coefficient 10 5 3 3 Calibration 11 5 3 3 1 Calibration period 11 5 3 3 2 Quantity of Calibration Block 11 5 3 3 3 Calibration mode introduction 11 5 3 3 4 Items before calibration 12 5 3 3 5 High value block calibration 12 5 3 3 6 Low value standard calibration blocks 13 5 3 4 Setting 13 5 3 4 1 Setting m...

Страница 3: ... FACTORS OF MEASUREMENT 25 6 1 Temperature influence 25 6 2 Lift off influence 27 6 3 Material thickness influence 27 6 4 Camber influence 28 6 5 Edge Effect 29 七 POINTS FOR ATTENTION AND MAINTENANCE 29 八 USERS NOTES 30 APPEDIX1 TABLE OF CONDUCTIVITY VALUE FOR COMMON MATERIAL AND TEMPERATURE COEFFICIENT 31 APPEDIX2 CONTACTS 31 ...

Страница 4: ...e coefficient etc simultaneously Two kinds of switchable frequencies for Sigma 2008B 60KHz for aviation industry standard 500KHz for detecting sheet metal Special temperature coefficient setting and auto calibrating mode convenient and reliable for user to operate Up to 500μm lift off compensation design for maintaining the measuring accuracy when painted coated or dusty on surface The variety of ...

Страница 5: ... 2 Metal classification Monitoring of strength and hardness Detecting the density of powder metallurgy parts ...

Страница 6: ...nt parameter simultaneously Power supply Provided lithium ion battery of 3 7V 2200mA h continuous working about 12hours Probes B type machine with diameter 14 mm working frequency of 60 KHz and diameter 8mm working frequency of 500 KHz of a probe B1 type machine with a diameter of 14 mm working frequency of 60 KHz of a probe Probe can be Self replacement Temp Probe Hand hold surface temperature se...

Страница 7: ...ine of conductivity meter 2 Detecting probes φ 14mm 60KHz 3 Special detection probe 4 External temperature sensor φ 8mm 500KHz 5 Curved surface test suite 6 Leather case for main engine protection 7 Conductivity standard blocks 8 Host machine stand ...

Страница 8: ...NS 5 1 Keyboard instructions 5 1 1 MEAS Measuring shortcut key 5 1 2 STORE Storing date effective on manual storing 5 1 3 CAL Calibration shortcut 5 1 4 SET Functions setting 5 1 5 OK Confirmation 5 1 6 UNIT DEL Measuring unit conversion key effective for measurement mode deleting key effective for query mode 5 1 7 a0 Temperature coefficient selection ...

Страница 9: ...select the temperature sensor of Automatic temperature compensation the normal measurement mode and the calibration measuring mode will appear the icon neither connected with the temperature sensor nor sensor broken nor detecting temperature is less than or equal to zero 5 2 3 indicating that the buzzer alarm is turned on when measurement mode select continuity measurement and buzzer Beep selected...

Страница 10: ...surement interface and standard interface and temperature coefficient value a0 are display invalid None that is to say it doesn t have to consider the current temperature value and select the temperature coefficient when measuring and calibrating As long as calibrate the higher lower value before the measurement Then return to measurement interface to measure the conductivity of the material refer...

Страница 11: ...ertical degree of probe plane and convex surface of work pieces then tighten the hand grip Remark Should calibrate the instrument before adjusting the hand grip c Diameter of material is greater than 8mm select diameter of 8mm 500KHz probe hand with shape grip to push to fasten on the probe of the inner core d Select diameter of 8mm 500KHz probe when measure sheet materials refer to 6 3 material t...

Страница 12: ...e i Continuity measurement interface the icons on the screen said alarm beeps open no icon is closed σH σL said conductivity high values and low values of separation point seeing 5 3 4 2 measurement interface mode 5 3 2 4 Measurement unit Measuring interface has two units of selecting methods one is default instrument unit MS m and IACS see 5 3 4 7 unit selection which used in data storage calibra...

Страница 13: ...ce temperature coefficient If unknown test temperature coefficient can refer to Appendix 1 common materials temperature coefficient or refer to standard data which the relevant authority provided b In measuring interface according to the temperature coefficient press key a0 to select a0 value appear the circle around a0 press the OK button the cursor moves into digital line press the superscript k...

Страница 14: ...on the instrument should be re calibration b When the instrument finish the preheating for a half hour time before the operation suggest calibrate once a time every 15 minutes c Working under the pseudo temperature compensation mode compare to the recent calibration if the calibration testing block temperature changes more than 2 proposed to re calibrate 5 3 3 2 Quantity of Calibration Block a Usi...

Страница 15: ...mperature compensation modes methods is the same as the measuring interface see 5 3 3 5 High value block calibration Enter the calibration interface the instrument performance high value blocks calibration first digital display next to the calibration at the top of the screen is setting value σH 20 shown below is the standard temperature coefficient value aH probe vertical flat on surface of the h...

Страница 16: ...strument get into automatic calibration and issue a tone after completion b Back to measuring standard block again if the error is more than 0 3 Re calibration according to step a until meet the requirements then put the probe into the air press the OK key exit the calibration interface The process of all calibration is not completed if press the measurement key MEAS or setting key SET the instrum...

Страница 17: ... 14 ...

Страница 18: ...e item then press confirmation key OK to enter the settings c In the settings if press the setting key SET or measuring key MEAS will return to their respective main interface 5 3 4 2 Measurement Interface a Press upward key or downward key to select the project when choose normal measurement press OK button to confirm tick inside the box enter into the ...

Страница 19: ... key finish the numerical modification press OK button to save and enters to change the lower limited value the way is the same as upper limit value after the completion press the OK button to save the data and enter the alarm buzzer sound Beep to open or close press or to select press the OK button to confirm and exit return to main setting interface d When the buzzer alarm sound Beep is selected...

Страница 20: ...rface b Use key and to select the temperature sensor or manual input temperature and then press OK key to confirm and exit to return settings interface 5 3 4 4 Temperature coefficient setting a Press upward key or downward key to select an an to modify or to add then click OK button to confirm the cursor moves into the digital part then press the ascending key or decreasing key to modify values if...

Страница 21: ...move to the numerical part use and key to modify the value if press and hold button can modify value quickly press OK button to save values and the cursor automatically move to the next project When the cursor is moved to σH press OK button to confirm use and key to choose the number of 1 to 5 one of σ1 to σ5 blocks set as the instrument high value calibration block press the OK button to save the...

Страница 22: ...wnward key to select the project tick inside the block press OK key to save and return to remind changing probe re calibration interface seeing the picture below Then press measurement key MEAS or wait the interface timing finished automatically to go into the measurement interface b 60 kHz and 500 kHz is the working frequency of the instrument probe 60 kHz φ14mm is for aviation industry standard ...

Страница 23: ...ge to the default units automatically on any surface the value is updated based on the conversion between the two units and storage of conductivity values is the same as the default unit until the next change 5 3 4 8 Back light selection a press upward keys or downward key to select tick inside the block press the OK button to confirm open or close and then exist and return into the main setting i...

Страница 24: ...confirm button OK exit and return to the main setting interface e How to delete the saved data in any of the query page of measured data click the delete button to delete the saved data of the page if press the delete key DEL for about 3 seconds you can delete all saved data When all saved data delete screen display empty language tips press OK key to exit and return to the main setting interface ...

Страница 25: ...g the data d Press the OK key the instrument start to upload the data the screen display Uploading prompt check the figure below e Uploading finished the screen display END prompt check the figure as below then press OK key exist and return to the main setting interface ...

Страница 26: ...e of the screen will flash said measurement data of the page has been saved d Automatic save the instrument measure a valid data every time N XXX character in the middle of the screen will flash and save the page of the measurement data automatically e Every time shut off and power on again the instrument will default manual save mode automatically f N XXX numerical is the stored set of memory in ...

Страница 27: ...ave unit 3 and quit the project the cursor moves to the time project setting method is the same as date If time project exit return the main setting interface b The first unit of date items can be set within 00 99 years the second unit can be 00 12 months and the third unit can be 00 31 days c The first unit of time items can be set within 00 24 hours the second and the third unit can be set withi...

Страница 28: ... and the temperature coefficient of the instrument 6 1 1 3 The conductivity can be measured accurately when select correct temperature compensation mode and temperature coefficient 6 1 2 Summery of the interaction between temperature compensation method various of methods and the material temperature coefficient and how to measure the temperature coefficient of unknown material 6 1 2 1 pseudo temp...

Страница 29: ... external temperature sensor both testing blocks have the same temperature select the value until temperature stable see 5 3 2 6 Then put the eddy current probe in the high and low values of calibration block to calibrate instrument After calibration begin to measure the temperature conductivity value of different materials Same with the calibration use temperature sensor to measured temperature v...

Страница 30: ...effect is when the non conducting layer such as paint plastic thin film dust etc between the probe and the measured material is less than distance from the lift off compensation the measuring conductivity value is correct Beyond the distance from the lift off compensation the measuring conductivity value will have a greater error 6 3 Material thickness influence If the actual material thickness is...

Страница 31: ...e Conductivity calibration use planar calibration testing block the probe impedance changes only with material conductivity When the probe measures on the camber the probe impedance changes not only with the conductivity but also with the diameter of the material surface According to the following relationship established formula of curvature compensation φ φ η σ σ σ the real conductivity value of...

Страница 32: ...7 The actual conductivity σ act σ φ η φ 58 1 032 56 2MS m 6 5 Edge Effect The eddy current probes of the instrument are all used of electromagnetic shielding technology it has a significant difference from other not shielded probes see Figure 6 2 diameter of 14mm probe can measure the minimum area which has the diameter larger than or equal to that of the probe the diameter of 8mm probe can measur...

Страница 33: ...irt 7 9 Instrument and the probe should be prevented vibration collision and the standard block surface should not be severely scratched 7 10 End of the probe if serious abrasion should be replaced with a new probe in case not affect the accuracy of measurement 八 USERS NOTES 8 1 This instrument is guaranteed for 1 year 8 2 In the following circumstances the company or the agency authorized by comp...

Страница 34: ... 0 0037 Nickel 22 12 8 0 0060 Magnesium 38 22 0 0040 Nickel silver 8 6 5 0 00068 Titanium alloy 1 02 0 59 0 0002 Tungsten 31 46 18 25 0 0052 Platinum 17 24 10 0 000374 Constantan 3 92 2 27 0 000005 Manganin copper 4 1 2 38 0 000005 APPEDIX2 CONTACTS Name Xiamen Tianyan instrument co Ltd Address Room 614 chuangye building pioneering part hi tech zone huli block Xiamen China Post code 361009 Wedsite...

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