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MINIMAG-M Operation manual
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1. Fig 5 Operation sequence 4 Magnetometer turn on and performance of test measurement 7 1 When the magnetometer is switched on the display shows setup window MINIMAG M DATE 00 00 00 TIME 00 00 00 0 LOCATION 000 MEMORY 4193280 BYTES CLOCK START ENT MODE SEke ESL l cursor for date time and number of the survey area setting To set the data use numeric keyboard Date should be in day month year format and time hours minutes seconds to launch the set time and information press ENT button As a default date is not set and the time will be counted from the switch on time 7 2 After setting the date and time press ENT then press ESC to go to the main menu To go to the main menu from any window press ESC 1 TEST 2 BROWSE 3 MANUAL 4 AUTOMATIC 5 UPLOAD 2 6 FLASH ERASE 7 SCAN To enter the selection of any mode type N ENT where N is the number of the chosen mode Pressing ESC for the second time in main menu switches display to setup window At dark time display can be lit by pressing lt 2 button 7 3 Press 1 ENT in main menu to enter TEST mode TEST T 000000 000 d 7 N 00 MEASUTEMENT ENT s 0 00 8 000 000 3 TAVG 00000 000 U 12 00 I 0 00 fp J The test measurements are made in order to check signal quality and magnetometer usabili ty Test measurements are not stored in the memory In TEST mode a series of measurements can be done in N type the quantity of measure ments In th
2. discharge cycles Fig 6 Service life in charge discharge cycles 11 3 The degree of charge discharge of the battery can be assessed with the use of the plot in Fig 6 through measuring the voltage of the battery at no load Volts 13 2 Conditions 24 hours after charge 10 minutes after discharge E Temperature 25 C z 12 6 _ a So 2 12 0 gt 11 4 Residual capacity Fig 7 Voltage versus residual capacity 16 11 4 In order to assure sufficient reliability the following conditions should be met e the voltage measurement should be made not before than 24 hours after the previous charg ing and not before than 10 minutes after turning off the load e measurements should be made at room temperature if the battery has been used at low tem peratures it should be exposed at room temperature for 2 3 hours It should be remembered that the storage battery capacity is heavily dependent on the am bient temperature For instance at an average discharge current of 0 1 A and ambient temperature 8 C the battery capacity will amount to about 65 of the rated value while at 20 C it will be about 50 11 5 Battery charging Battery charging should be performed at room temperatures with the use of the automatic charger supplied with the standard service kit The battery charger operating instructions are given in the attached certificate Charging process is indicated with the red light and when the ba
3. needed at the same point press All measurement performed on one point are saved in memory The last one is counted as most reliable When the last measurement is done on the line press to set next line and point number go to setup display 4 5 4 The result can be displayed as a graph To enter that mode press F 11 CHOOSE SCALE 1 0 4 2 4 3 40 7 4 400 APPLY ENT a Choose the scale of the graph Shown values are in nT 40 points can be displayed Choose one of the possible variants of scaling Set the scale and press ENT 5 5 Then choose horizontal step CHOOSE STEP 1 2 3 8 APPLY ENT EEE Horizontal step means how many measurements are displayed If 1 is chose then 120 mea surements will be displayed 2 60 measurements 3 40 measurements 5 6 The result is shown as a graph STP 0 4 00 00 00 9 s C 00000 00 At top left corner chosen scale is displayed in nT at top right corner the time of last mea surement bottom right corner the value of last measurement at the bottom signal level is shown Press e to manually move the graph to the center 5 7 As the memory is full the measurement process is blocked the following message appears on the screen MEMORY FULL RETURN ESC 10 The magnetometer should be switched off and the memory should be unloaded with follow ing erasing 12 6 AUTOMATIC MODE 8 1 To enter automatic mode press 4 ENT in main men
4. 11 Malte e ModE isa 2xneceuneecaecrananade sd cesta auekiuaenyenn saminda etaauakienenesacee dese 13 Daa VAC WV scsi rete tec ia ets ta eee cd tin etree a ele ae ead acelin LOT E cau en 14 Dal OU DIL 22 4554 55454 5 4214444523014325 eu Gera W 200 We KA O ya Ka P a 14 PRAD E eeror nne e _ _e_e _erle_ r lm yepeeerreppeJrJerezzezJ zgzrz a_ 15 wei na E aran Ea T T E E T E 15 Battery perating IMS FUCtION i lt yasaya ke 4al yaki Wa Wk la ey b 0 RANA a n y tends E ETEA 16 Pis a dune S rerien en Aen A N A A TTE 17 PRECAUUOUS Ay EE E E E AA O E A AE N 17 SONIO G po SORER 17 Introduction MINIMAG M is an upgraded variant of portable single channel proton magnetometer with a simplified control circuit designed for a wide variety of applications in mineral exploration as well as for detection of buried magnetized objects It can also be used as a self contained base sta tion magnetometer geomagnetic variation system with a programmable working cycle with a maximum sampling rate of reading per 2 seconds In spite of its small size MINIMAG M has sufficiently high metrological characteristics which ensure high accuracy magnetic survey At the basis of its development is the present day ideology of the design of field magnetic instrument which involves employment of microprocessor control and accumulation of digital data in the memory The MINIMAG M development program a joint effort of Geologorazvedka Enterprise
5. LOCATION 000 UPLOAD ENT UPLOADING DATA MEMORY 4193280 CANCEL ESC PLEASE WAIT BYTES CLOCK START ENT MODE SEL ESC ESC OUTPUT FINISHED MAIN MENU ESC 1 TEST SCAN 2 BROWSE START ENT 3 MANUAL RETURN ESC 4 AUTOMATIC N 00 T 000000 000 D 7 5 UPLOAD 6 FLASH ERASE U 12 00 I 0 00 7 SCAN S 0 00 Cl ERASING FINISHED 6ENT ERASE TEST T 000000 000 d 7 ERASE N 00 MEASUTEMENT ENT ENT OK s 0 00 8 000 000 ESC CANCEL TAVG 00000 000 U 12 00 I 0 00 C MEMORY FULL RETURN ESC PLEASE WAIT 2ENT BROWSE BROWSING START DATE 00 00 00 T 000000 000 TIME 00 00 00 0 DATE 00 00 00 AUTOMATIC T 000000 000 TIME 00 00 00 0 DATE 00 00 00 STP 0 4 00 00 00 0 TIME 00 00 00 0 Loc 00 M TC POINT 1000 FIND ENT Loc 000 LINEOOOO PT0000 PREV NEXT PREV NEXT S t c 00000 00 READY T 000000 000 D 0 SETUP T 000000 000 D 0 TIME 00 00 00 0 LINEOQOOO PT0000 LINE 0000 TIME 00 00 00 0 REPEAT ESC POINT 0000 t 4 LINEOOOO PT0000 PLOT F END t GO ENT RET CO ENT U 12 00 I 0 00 U 12 00 I 0 00 ees APPLY ENT APPLY ENT 4ENT AUTOMATIC T 000000 000 D 0 TIME 00 00 00 0 CHOOSE SCALE READY SETUP T 000000 000 D 0 CYCLE 00 00 00 0 M TCPOINT 0000 CYCLE 00 00 00 0 TIME 00 00 00 0 M TC POINT 0000 M T POINT 0000 PLOT F END t GO ENT RET t S 0 00 8 000 000 APPLY ENT U 12 00 I 0 00 U 12 00 I 0 00 APPLY ENT C C Cl
6. Ministry of Natural Resources of Russian Federation Federal State Unitary Research amp Production Enterprise Geologorazvedka MINIMAG M new edition Portable Proton Magnetometer User manual St Petersburg et JA Contents mayl KTS 1 NAPE EE E EET ET EE ET E E T 3 PART 1 Technical description yii sla kl k lek l ae u eE oaa e00 PUT N Ka e000 nne KO n n i RW Ye WW Ked ON oe d Se ye saeco iW Pe 3 Teehniealc WaraCteriSUcCs cirereta e h ER S E Ka K h KER OD W k KAN a 6 K AA 3 Complete set of the MINIMAG magnetometer k 4 Arrangement and operation of the magnetometer k 5 PHNCIPIC OLODE IOM i sall Keyan nn n KOn h i An KDN Wen K00 0 A2 250 34052 5950 b an k y 5 BOG Kear an ic DH HH T T EE 5 PARTZ Operation T STT C N yu Kel nay ne N Sen Web welal n b e A W A k n Coa r E Kan A A WO A eos WO O e ene Aa Ce ie eW 7 Mi Toro tole tSn CONE O S s nuner 0010584445433525 905 0k40 4044405002 k 2042825054425448 0 212452 2500 7 COMO puton TUN CHONG yx xt 2 cate curd saucer setae ge epedd enn aesetamerdya teense Wan 0 9410 E 7 Pre Slariiin DI OCCO UL eeo a Maleate tah e ee n An ti E ace eh S N4 KA KA O W 8 Magnetometer turn on and performance of test measurement jj j j 10 IVF IOC arses 55 Ay N9N 000 9050A 000009 ane can Da G
7. and Geomer Center was completed in 2009 Compared to previous modification of MINIMAG the new one has easies control protocol and more reliable maintainability New LCD display is bigger and has better contrast than the one of the previous generation The graph of the recorded field 1s shown on the display now And the memory is increased 8 times what reduces limitations of the use of magnetometer Digital data output is performed via RS 232 or USB Magnetometer kit is supplemented by remote launch button for convenience in case of survey performance by one operator The present manual consists of two parts In the first part technical description the user is introduced to the principle of operation and the design of the magnetometer the second part opera tion instructions contains basic recommendations on the instrument operation under field condi tions PART 1 Technical description 1 Functions 1 1 The MINIMAG M portable proton magnetometer is designed to measure the absolute value T of the Earth s magnetic field in carrying out ground magnetic survey operations and detec tions of buried ferrous objects 1 2 The main restrictions on the operations with magnetometer and high level of electromagnet ic industrial noise and heterogeneity of measured field Maximum gradient should not exceed 5000nT m Without special precautions it should not be used under vibrations and shaking 2 Technical characteristics 2 1 Tota
8. at case magnetometer will automatically measure the magnetic field each 2 s N times and calculate average field value Tavg and RMS For quality control power supply voltage U and current consumption I are also displayed The signal level is shown as decaying black stripe 10 5 MANUAL MODE 5 1 To enter manual mode press 3 ENT in main menu SETUP LINE 0000 POINT 0000 t J 4 APPLY ENT Line number and point number can be set here With 7 or chose either ascending or des cending numbering of points 5 2 Press ENT twice Ready to work window will be shown READY T 000000 000 D 0 TIME 00 00 00 0 LINEOQOOO PTOOOO 5 GO ENT RET 1 U 12 00 I 0 00 Do Magnetometer will show the values of magnetic field measured every 2 s without saving into memory current time and position line and point and signal level indication in form of shaded decaying line For quality control power supply voltage U and current consumption I are also displayed The number of the station does not change therewith If error occurs in any data shown press to go to the previous window 5 3 Press START button to launch the measurement T 000000 000 D 0 TIME 00 00 00 0 LINEOOOO PTOOOO REPEAT PLOT F END t 6 GO ENT U 12 00 I 0 00 Do Magnetic field value time and coordinates will be stored in memory Point number is auto matically changed when measuring magnetic field next time If another measurement is
9. cess is blocked and the message appears as in 5 7 section In this case the magnetometer should be turned off and the memory should be unloaded with the following erasing 13 7 DATA VIEW 7 1 To enter data view mode press 2 ENT in main menu BROWSING START DATE 00 00 00 TIME 00 00 00 0 14 FIND ENT ev Using the cursor control keys or and 7 or set the date and the time of the data to be reviewed Press ENT 7 2 The information of the frame nearest to the specified time will be displayed on the screen To review the consecutive readings stored in the magnetometer memory within the specified date before or after the specified time push the or 7 keys 7 3 If the date is not specified the default value is 0 all readings stored in the memory will be available for review 8 DATA OUTPUT 8 1 To output data use RS 232 cable or RS 232 with USB connector It is recommended to disconnect the control unit from the battery Turn on the PC and launch the supplied with magnetometer minimag m exe utility Choose the COM port that the magnetometer is attached to and press IMPORT DATA 8 2 Turn on the magnetometer and choose UPLOAD mode by pressing 5 ENT in main menu START DATE DATE 00 00 00 UPLOAD ENT CANCEL ESC 15 Using the cursor control keys or and the numeral selection keys or specify the date the information of which is to be unloaded If the date is not specified zero values all the info
10. ead of the precession signal period or signal to noise ratio it is expressed in numerals from 0 to 9 when D 0 to 2 signal is normal when D gt 2 signal is degraded at D 9 there is no signal 4 4 Arrangement and operation of the magnetometer 4 1 Principle of operation The magnetometer measurements are based on free precession of polarized protons in sen sor under magnetic field influence The polarization is based on the Overhauser effect Each measurement cycle consists of two periods First period polarization DC and high frequency magnetic fields act on the sensor work ing substance so that the proton spin axes turn perpendicular to the Earth s magnetic field vector Second period measurement polarization is turned off and protons begin to precess around the Earth s magnetic field vector As a result a damped sinusoid shaped signal EMF is in duced in HF coils of the sensor The frequency of the sinusoid is proportional to the magnetic in tensity T Fas y where F frequency of the precession signal T magnetic intensity y proton gyromagnetic ratio If F Hz T nT then y 23 487189 nT Hz The signal is amplified in the signal excitation unit and in the control console the preces sion signal frequency is measured and converted into the magnetic field value 4 2 Block diagram The magnetometer consists of three main blocks the magnetometric transducer comprising the sensor and the s
11. eliability parameter D of the mea surement e reading order number e reading time auxiliary information entered by the operator date site number starting number 2 11 The memory capacity allows to store about 500 000 readings in the walking mode of opera tion and no less than 1 000 000 readings in the base station mode 2 12 The information stored in the memory can be output to a PC via the RS 232 or USB inter face 2 13 Operating temperature range 10 C 50 C the magnetometer drift over the operating temperature range does not exceed 0 5 nT 2 14 Weight of the complete working outfit does not exceed 4 kg 3 Complete set of the MINIMAG magnetometer Assembly units TT2 809 015 01 Magnetometric transducer TT3 036 021 01 Control console LC 123R4PG Storage battery TPITA 468363 004 Cable connecting megnetometric trans ducer and control console TPPIIA 468363 001 Power supply cable TPITA 468363 167 Remote launch button cable Accessories LC 123R4PG Storage battery TY3468 005 39491876 99 Battery charger TPPITA301 549 002 01 Backpack harness Case TPPITA468 363 002 RS 232 cable TPITA468 363 005 Power supply cable additional US232B Cable RS232 USB ja ll ee jx ll ja ee ee en Packing TT4 161 044 Packing box Documentation TT1 420 087 01 P3 Operation manual TT1 420 087 01 O Record of calibration service CD R with the data input program D is a conditional parameter which is characteristic of the spr
12. eypad which has 18 independent buttons with normally Open contacts A keystroke is accompanied with a beep 2 2 Control button functions Fig 3 Keyboard START test or survey measurements magnetometer start up in the base station mode memory data unloading to a PC ESC move to the main menu ENT launch the operation F switch to image mode e move the graph to the center second measurement T step backwards cursor move to the right lt cursor move to the left T and j numeral selection y display illumination 3 Pre starting procedure 3 1 Make sure that the seals on the transportation box are intact then unpack the magnetometer Check the compliance of the contents with the certificate and the note of contents on the inside of the box cover make sure that the magnetometer components have no mechanical damages remove the preservative 3 2 Before turning on the magnetometer read carefully the technical description and operation manual 3 3 Recharge the storage battery 3 4 Fasten the magnetometer function units in the backpack harness and connect the units with cables following the indications thereon Fig 3 3 5 Make sure the operator does not have any magnetized objects Fig 4 Backpack harness 1 sensor 2 control unit 3 battery 4 remote launch button SETUP MENU SENT UPLOAD MINIMAG M DATE 00 00 00 START DATE TIME 00 00 00 0 DATE 00 00 00
13. gnetometer is not able to detect signal It may happen when for example gradient of measuring field is so great gt 10 000 nT the sensor cannot adjust the measuring field 10 2 When this mode is launched the device will automatically measure magnetic field in differ ent ranges measuring each second choosing the one with biggest amplitude and smallest D pa rameter The end of scanning 1s indicated with a signal After that press ESC to go to the main menu and continue measurements 10 3 If the D parameter is still unsatisfying gt 3 4 that meant the sensor in located in highly gra dient field The position of the sensor should be changed 15 11 Battery operating instruction 11 1 The magnetometer operates from a non magnetic sealed lead acid storage battery of the LC R123R4PU type with a capacity of 3 4 Ah Operating temperature conditions Charge 0 C to 40 C Discharge 15 C to 50 C Storage 15 C to 40 C Normal operating conditions 25 C 11 2 The average service life of the battery may vary from 3 to 5 years depending on operating conditions e g the service life extends considerably as the degree of discharge is reduced Fig 5 That is why it is not advisable to discharge the battery to a degree lower than 50 of the rated capacity Degree of Degree of Degree of discharge discharge discharge 100 50 30 Achievable capacity 0 200 400 600 800 1000 1200 1400 Number of charge
14. ignal excitation unit the control console and the storage battery power supply Signal excitation unit Sensor Signal HE H F Signal oscillator amplifier Polarization Working pulse substance il Range code coils Dm SL ee amp teh Capacitor 8 Fig 1 Magnetometric transducer The sensor is designed to obtain a signal of free precession of protons placed into the mag netic field to be measured The sensor Fig 1 comprises a glass ampoule with the working substance located in a high frequency circuit Over the HF circuit the low frequency coils are wound During polarization a low d c bias current is applied to the LF coils and high frequency energy to the HF circuit When polarization is turned off EMF of a signal of a damped sinusoid shape is induced in the LF coils The signal excitation unit comprises a HF oscillator and a signal generator board The latter contains a switching node a bank of trimming capacitors and a signal amplifier The trimmer ca pacitor bank and sensor LF coils form a series oscillatory circuit tuned to the signal frequency Tuning is effected by the processor based on the previous measurement result The precession sig nal is amplified and fed to the control console for measurement During polarization the HF 5 oscillator generates HF energy Switching of the signal excitation unit components to polarization and to measurement is effected by the switching node The basis of the control con
15. l field measurement range 20 to 100 uT with a reading error 0 01 nT 2 2 The limit of the basic systematic error of total field measurements over the entire range no more than 2 nT 2 3 The limit of the root mean square error in total field measurements does not exceed 0 03 nT over the range from 30 to 100 uT and 0 1 nT over the range from 20 to 30 uT 2 4 Magnetometer drift with time does not exceed 0 2 nT over 8 hours of continuous opera tion 2 5 The magnetometer has a manual operation mode and an automatic measurement mode with a working cycle programmable from 2 seconds to 24 hours in 1 s steps one measurement time does not exceed 2 s 2 6 Operating conditions setting time no longer than minute 2 7 Internal real time clock instability no greater than 1 second over 24 hours 2 8 The magnetometer has an external power supply of 13 2 V storage battery variations in magnetometer indications with power supply variations from 11 V to 15 V do not exceed 0 2 nT an average power consumption at 10 s intervals does not exceed 1 W 3 2 9 The sensor operating angle is 45 from the optimum orientation when the sensor low frequency coil axis is orthogonal to the magnetic field vector an additional error due to sensor orientation deviation from the optimum by an angle of 45 is no greater than 1 nT 2 10 The information stored in the magnetometer memory e magnetic intensity at each station accompanied by the r
16. ometer is operated from the keypad All modules of the magnetometer are power supplied from a 12 V storage battery us ing secondary power supply sources PART 2 Operation instruction 1 General 1 1 The present manual contains a complete set of instructions and recommendations intended to assure proper service and failure free operation of the MINIMAG M magnetometer and to make the best use of its performance capabilities Before putting the magnetometer into opera tion mode read this manual carefully 1 2 The magnetometer is delivered to the customer tested calibrated and sealed packed in a transportation box In case of transportation or storage of the magnetometer at low tempera tures the turn on is allowed only after 4 hours of exposure at 20 5 C 1 3 The magnetometer is a sophisticated electronic instrument and should be handled with care 1 4 The magnetometer is handled by one operator The operator should be familiar with the magnetometer service instructions and follow them carefully The operator should also know the magnetometer performance capabilities and operating modes and use them properly 1 5 The magnetometer is powered from a 12 V storage battery which should be used in com pliance with the instructions attached 1 6 In case of direct current supply from the mains the mains unit housing and negative termin al should be properly grounded 2 Magnetometer controls 2 1 The magnetometer is operated via k
17. rmation stored in the memory will be output 8 3 The data array of this date will be output to the computer UPLOADING DATA PLEASE WAIT 16 When the data output is accomplished the computer input program is closed by the ESC command 8 4 The exported data can be viewed on PC e If the data is exported from automatic mode datasheet will contain 2 columns magnetic field value and time of measurement e If the data is exported from manual mode each measurement will have 4 parameters mag netic field value time of measurement point number and line number 14 e The heading of datasheet will consist of survey area number and date Data from automatic mode will also have cycle of measurements route number or base station position informa tion Exported data is saved to PC memory and can be reshown later 9 ERASE 9 1 To erase the information go to main menu and press 6 ENT The following window will be displayed ERASE ENT OK ESC CANCEL 17 Erasing data cannot be undone 9 2 After pressing ENT window will switch to dialog PLEASE WAIT 18 After this procedure the display will show setup menu in case ESC button was pressed main menu will be shown 10 SCAN MODE 10 1 To enter scan mode go to main menu and press 7 ENT After that press 2 ENT to see the dialog SCAN START ENT RETURN ESC N 00 T 000000 000 D 7 19 U 12 00 T 0 00 S 0 00 Po Scan mode is designed for cases when ma
18. sole Fig 2 is the control module where a one chip microcom puter is used as a processor The microcomputer contains the processor the main storage the pro gram memory the counter timers the comparator They perform all data processing and transfer operations ceramics aural e Reference Memory indicator Polarization pulse oscillator 5 MHz Keypad Signal Range code RS 232 output Level converter 12 6 V Secondary 13 V 10 V power 5 V suppply 8 V Fig 2 Control console A signal in the form of a damped sinusoid is fed from the signal excitation unit to the con trol module input shaper where it is converted into square pulses which in turn are fed to the pro cessor counter timers Through the use of counter timers the processor calculates the mean value of the signal frequency and then converts it into the magnetic induction units The field measurement results the time instant of the measurement and the frame serial number are stored in the memory The clock frequency for the processor is provided by a reference 20 MHz temperature compensated oscillator with the stability not less than 2 10 The measurement results and aux iliary information are displayed Control of the magnetometric transduser is performed by the pro cessor via the signal level transformer which performs matching of the level of the control module signals with the level of the magnetometric transducer signals The magnet
19. ttery is charged green light In the absence of the battery charger it is allowed to apply a constant current source with a controllable voltage and provided with a test ammeter As with any type of acid storage batteries the optimum charging current is estimated at 0 1 of the battery capacity i e here it is about 0 7 0 9 A In case of emergency a rapid charging is permissible It should be remembered however that the increase of the charging current results in significant decrease of the battery capacity 11 6 Precautions All safety precautions pertaining to the application of lead acid cells should be observed in operation of the storage battery The battery should be protected from shocks which may cause damage to leak proofness and eletrolyte leaks Operation of the battery in small closed unventilated rooms close to heat sources and in di rect sunlight is not allowed The use of the battery upside down is not advisable In order to avoid short circuit and excessive current leakage the battery terminals and the surface in between should be kept clean 11 7 Storage The battery may be stored at temperatures from 15 C to 40 C The battery terminals should be at no load The battery is liable to self discharge The rate of self discharge increases with increasing temperature Therefore the battery should be recharged at least once every 6 mouths 17
20. u SE TUF CYCLE 00 00 00 0 M TCPOINT 0000 11 APPLY ENT Set cycle period of time of automatic launching the measurements and M T route number or base station position 8 2 After setting the cycle press ENT Ready to operate window will be shown READY T 000000 000 D 0 CYCLE 00 00 00 0 TIME 00 00 00 0 M T POINT 0000 12 GO ENT RET T U 12 00 T 0 00 Po Magnetometer will show the values of magnetic field measured every 2 s without saving into memory If error occurs in any data shown press to go to the previous window 8 3 Press START button to launch the measurement T 000000 000 D 0 TIME 00 00 00 0 M T POINT 0000 PLOT F END 1 13 S 0 00 6 000 000 u 12 00 T 0 00 Po The screen is similar to that of the manual measurements mode except that a root mean square error of the last 15 measurements will be displayed rather than the reliability of a single measurement The value of this error characterizes the magnetic field variations which take place at the moment Should the need arise to change the initial measurement number the cycle and the series of measurements press The automatic measurement process will be discontinued To proceed to au tomatic measurements with new parameters push the START button The result can be displayed as a graph To enter that mode press F and follow the instruc tions in 5 4 5 6 section As soon as the memory is filled up the measurement pro
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