Manual - ChenYang Technologies GmbH & Co. KG
Contents
1. block disc cylinder ring and segment with a Helmholtz coil or simple single coil 8 1 Flux Measurement with Helmholtz Coil Helmholtz Coil Helmholtz coil refers to a device for producing a region of nearly uniform magnetic field It consists of two identical circular magnetic coils that are placed symmetrically one on each side of the experi mental area along a common axis and separated by a distance h equal to the radius A of the coil Each coil carries an equal electrical current flowing in the same direction Reversely a current will be gene rated in the Helmholtz coil when a Signal permanent magnet is placed in the Output center of the coil The flux passing through the coil can be determined by measuring the current with the fluxmeter Viewing Hole Measuring Procedure Connect the signal output of the coil to the fluxmeter INPUT 3 and adjust the height of the measuring platform in the coil in order to be Suitable for the measurement The best position of the measuring object is determined by the center point of the measuring object The center point should be at the center Measusing of the viewing hole of the coil Platform Measuring Object 10 Put the measuring object on the measuring platform at the center of the coil Measure the flux of the object according to the measuring methods mentioned above See measurements in the section 7 Calculation of Magnetic Flux Density B The magn2. the measuring object if the display value without any symbol in fact it is South Pole is on the bottom side if you get the minus value from the display Negative Measurement Put the measuring object e g permanent magnet into the measuring coil and press the RESET 14 and then take the measuring object far away from the measuring coil and read write down the display value immediately This value is the measuring flux result of the measuring object with opposite symbol You should reverse the symbol of the measuring value in order to get the right magnetic pole of the measuring object Average Measurement In order to get the accurate measuring value you can use the positive measurement and negative measurement and then calculate the average of the two measuring results The average value is considered as the measuring result Here is the measuring procedure Press the RESET 14 and put the measuring object e g permanent magnet into the measuring coil Read and write down the first measuring value immediately Press the RESET 14 again and take the measuring object far away from the measuring coil and read write down the second measuring value immediately Y Note The value will be changed after a time period because of the electrical signal drift Therefore the measurement should be finished in a few seconds This means that you should read the measuring value immediately after taking the measuring object from the m
3. 0mm x 240mm x 95mm Fax 49 0 8121 2574101 Weight 2 0kg Email info chenyang gmbh com http Awww chenyang gmbh com 3 Accessories e Helmholtz coil SS a T mep 4 Special Coil e Custom made coil 5 Measuring Principle 1 piece Structure 0100 x 50mm Dimension 100 x 85mm Standard Note The outer diameter of measuring object should be smaller than 040mm additional purchase order Custom made coil for segment block magnets Additional purchase order is needed This series of Fluxmeter measures the flux of a magnetic field by using the electromagnetic induction principle and electronic integration method The diagram of the measuring system is shown in the following figure 3 From measuring coil Input Input current Buffer amp Hold Display _ Driver A current is induced by the change of magnetic flux passing through a measuring coil The current is the input of the fluxmeter After the integration of the current one obtains a DC voltage signal which is proportional to the change of the magnetic flux The DC voltage is converted into digital signal and displayed by the LEDs Thus the magnetic flux can be measured in this way Integrator According to the electromagnetic induction principle the magnetic flux can be written as g B N S 1 Where B Magnetic flux density applied to measuring coil Tesla N Windings of the measuring coil S Sec
4. 1 Introduction Chen Vang e an te The Fluxmeter CYHT700SP is an electronic integrating digital displayed instrument with high sensitivity and small drift The Fluxmeter can be used not only for the measurement of the magnetic flux of permanent magnets but also for quality control and sorting of magnetic products Its os versatility makes the employment possible in laboratory enterprise as also Digital Fluxmeter eee i PORER p y enterp CYHT 700SP This Fluxmeter has the functions such as maximum value hold and automatic pole indication and 4 measuring ranges It can be used also for measurement of impulse magnetic field User s Manual 2 Technical Data Range Display Range Effective Range resistance 1 999mwb 10 10 wb 0 001mwb 10kQ 19 99mwb 10 10 wb 0 01mwb 100kQ Accuracy 1 0 Instability drift 5 Digits 10s 10 Digits min Display 3 1 2 LED automatic polarity display Output signal 0 2V DC analogue Functions Maximum value hold automatic polarity indication Sorting setup maximum amp minimum limits Red LED higher than maximum limit Yellow LED lower than minimum limit Chen Vang Technologies GmbH amp Co KG Green LED within the tolerance PASS Ambient temperature 5 C 40 C Storage temperature 25 C 55 C Warm up time 30min Markt Schwabener Str 8 Relative humidity 20 80 85464 Finsing Germany Power supply AC 220V 50Hz Tel 49 0 8121 2574100 Dimensions 28
5. easuring coil 6 Peak Value Hold press HOLD 8 and RESET 14 and put the measuring object e g permanent magnet into the measuring coil The maximum value will be displayed and hold even if the measuring object is removed from the measuring coil Press RESET 14 before the next measurement in order to reset the maximum value Note Drift adjustment is necessary under pressing MEAS 4 before measurement In HOLD mode a drift adjustment is not possible 7 Selection Function Selection function is mainly used to online test the magnetic performance of products After pre setting up the maximum and minimum flux limits of the products one will get three classifications 1 lower than minimum limit LOW yellow 2 between the two limits GO Pass green 3 higher than the 8 maximum limit HIGH red Using the result the eligibility of the products can be distinguished The selection system is composed of functional switches setup adjustment and classification display The functional switches include SELECT 12 HIGH LOW 10 and SET 9 After pressing SELECT 12 the instrument switches to the selection mode By pressing SET 9 the instrument switches automatically to the setup status Use the HIGH LOW button to adjust the potentiometer to the maximum and minimum limits Under the SELECT mode measurement and selection can be carried out simultaneously When both SELECT 12 and SET 9 buttons are released the instrumen
6. etic flux density B can be written as follows BSC 1 uit 3 V in Where B Magnetic flux density in Gs Q Magnetic flux measured in Maxwell Rin Input resistance of Fluxmeter C Coil constant in cm Rc Coil resistance V Volume of the measuring object in cm 1mwb 100000 Maxwell 10 Maxwell Note The inner diameter of the Helmholtz Coil should be at least 2 5 times of the outer diameter of measuring object Examples Measurements of NdFeB Magnets material grade N38 Size mm CoilconstantC Flux mwb B Gs 20x20x20 0 01294cm 12357 7 12 x 10 0 01294cm 12821 0 20x 8x5 0 01294cm 11774 0 8 2 Flux Measurement of Segment Block Magnets The magnetic flux of segment or block magnets can be measured with a special coil shown bellow Y Direction agnet Position Signal Output Y Position Adjustment X Position Adjustment A X Direction Adjust the X and Y position of magnet by using the X and Y adjustment knobs The scale value in X direction should be equal to the half of the width of the magnet and scale value in Y direction equal to the half of length of the magnet Right angle Place the segment magnet to the magnet position One vertex angle of the magnet should be connected to the right angle of X direction scale Measure the flux of the object according to the measuring methods mentioned above see measurements in the section 7 Segment Ma
7. gnet 9 Warranty Measuring instrument 12 months after shipment Helmholtz coil 12 months after shipment 10 Service Please contact us for technical questions repairing and replacement etc ChenYang Technologies GmbH amp Co KG Markt Schwabener Str 8 85464 Finsing Germany Tel 49 0 8121 2574100 Fax 49 0 8121 2574101 Email info chenyang gmbh com http www chenyang gmbh com 12
8. on MEAS 4 the LED display 2 will show a random value The displayed value will increases in one direction continuously This value drift is caused by the accumulation of the signal drift of the integrator in the fluxmeter The adjustment is in the right turning direction if the drift value changes slowly during adjusting the drift with the zero potentiometer COARSE 6 Otherwise you should reverse the turning direction of the adjustment until the drift value changes considerable slowly In this case one can also use the FINE 7 potentiometer to adjust the drift Press the RESET 14 button after the drift value has been stable The LED should display zero If the display is still not to zero one should not stop the adjustment until the display is zero The zero point will be more stable if you use the FINE 7 potentiometer to adjust the drift Measurements after the drift adjustment you can start the measurement in the following ways Positive Measurement Press the RESET 14 and put the measuring object e g permanent magnet into the measuring coil Please note the magnetization direction of measuring object should be the axial direction of measuring coil The LED shows the measuring value of the flux of the measuring object Please read and write down the measuring value immediately NdFeB Block Magnet Magnetization direction North Pole gt South Pole Helmholtz Coil The North Pole is on the bottom side of
9. t switches to the measurement mode Operation instruction 1 After pressing SET 9 set the LOW HIGH 10 button at HIGH position and adjust HIGH potentiometer to make the display to the maximum limit MAX 1000 indicates the full range excluding the radix point Press SET 9 and set the LOW HIGH 10 button at LOW position and adjust LOW potentiometer to read the minimum limit MIN on the display Note the maximum limit must be higher than the minimum limit The minimum limit will change with the adjustment of the maximum limit while the maximum limit doesn t change with the adjustment of the minimum limit 3 By pressing SELECT 12 the instrument switches to the selection mode The LOW yellow LED will be on when the display is reset to zero because zero Is lowest value 4 The measurement can be taken only after the correct setting Apart from the direct digital display of the measurement result X the comparative result between the measurement result and the MAX MIN limits will be displayed by the LEDs Red LED X gt MAX Green LED MIN lt X lt MAX product is eligible Yellow LED X lt MIN 5 When the SELECT and SET buttons are released to the original status the instrument exits from the selection mode and all LEDs are switched off The measurement mode and hold mode are available again 8 Applications The fluxmeter CYHT700SP can be used for measuring the inner flux of permanent magnets
10. tioned area of the measuring coil m On the other hand the magnetic field can be determined by B E 2 N S Therefore one can determined the magnetic field after measuring the magnetic flux passing through the measuring coil 6 Parts and Functions The power supply socket outlet 15 and the voltage output connector 16 are on the back panel of the fluxmeter Connect the voltage output 0 2VDC to multimeter or to A D and computer if it is necessary 4 7 6 11 2 Front Panel Parts r Power Button 2 LED display 3 Input socket outlet 4 Measuring button 5 Measuring range 6 Coarse adjustment N 7 Fine adjustment 8 Peak value hold as 9 Sorting Setup 10 High Low Setting LO 11 High Low value adjustment 12 Selection Z 13 Classification LEDs 14 RESET 3 2 15 Power socket outlet 16 Analogue voltage output X _ Functions D s 1 Power button to switch ON OFF the fluxmeter 2 LCD display to display the magnetic flux and pole direction north pole south pole 3 Input socket outlet to connect the measuring coil to the fluxmeter 4 Measuring button press this button to measure the magnetic flux 5 Measuring range to select the measuring range 1mwb 10mwb 100mwb and 1000mwb Coarse adjustment to adjust the drift compensation coarsely Fine adjustment to adjust the drift compensation finely Peak value hold to display and hold the peak max value Sorting se
11. tup to set the maximum and minimum value for sorting the measuring object 10 High Low setting Press this button to set the Low limit value release the button to set the High limit value 11 High Low value adjustment to change the High Maximum value and the Low Minimum value 12 Selection press this button to let the Fluxmeter to work in the selection mode 13 Classification to indicate the selection result HIGH Measuring value gt Maximum value Pass GO Minimum lt measuring value lt Maximum LOW Measuring value lt Minimum 14 RESET reset the display to zero 15 Power socket outlet to connect the power supply 220VAC 50Hz 16 Analogue voltage output to output an analogue voltage 0 2 0V DC Measuring Range Output Range 0 1 999mwb 0 19 99mwb DRIFT agdagition O ONO E E e C E RAMSE inm E ER HOLD MEAS 16 Output POW 13 100mwb 0 199 9mwb 1000mwb_ 0 1999mwb Back Panel T Measuring Procedure After connecting the power supply to the power socket outlet 15 of the fluxmeter press the button POWER 1 to switch ON the fluxmeter The LED display 2 is on Connect the measuring coil for instance Helmholtz Coil to the INPUT 3 of the fluxmeter Press the button MEAS 4 and select a suitable measuring range such as 10 100 and so on Please select the highest range when the range is unpredictable Drift Adjustment after pressing the measuring butt
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