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F.W. Bell 8000 series, Instruction Manual

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F.W. BELL    8000 Series     Gauss/Tesla Meter Instruction Manual 
 

 

Section 6 – Flux Density Measurement 

 

6-1

 

 
 

SECTION 6     Flux Density Measurement

 

 
 
 

Overview 

 
 
 
 
 
 

This section describes magnetic field measurement operations for the 8000 
Series gauss/tesla meters.  Each of the meter’s functions and features 
relating to field measurement is described in detail.  This includes general 
considerations, technical information, and instructions on how to use each 
feature or function. 
 
 
For a general discussion concerning the user interface, see Section 5 – 
User Interface. 
 
 

Summary of Contents for 8000 series

Page 1: ...8000 SERIES GAUSS TESLA METER Instruction Manual ...

Page 2: ...THIS SIDE BLANK Inside of Front Cover ...

Page 3: ...8000 Series GAUSS TESLA METER Instruction Manual Manual UN 01 270 Rev B February 2017 Applicable System Firmware Release 1 6 2 All Rights Reserved ...

Page 4: ... most of the materials in an appropriate manner The crossed out wheeled trash bin symbol indicates compliance with the European Union Directives 2012 19 EU and 2006 66 EC on Waste Electrical and Electronic Equipment WEEE and batteries For information on recycling options please check the Meggitt Sensing Systems Recycling website http www meggittsensingsystems com WEEE recycling index html RoHS Com...

Page 5: ...the operator to additional information contained in this instruction manual also identified by the same symbol NOTICE See Pages 4 1 4 2 and 4 3 for SAFETY instructions prior to first use See Page 2 4 for EMC Notes concerning I O Cables and I O Filter Adapters ...

Page 6: ...5 Zero Flux Chambers 2 6 SECTION 3 Probes 3 1 Overview 3 1 Probe Variations 3 2 Probe 3 3 Memory 3 3 Probe Stem 3 3 Temperature Effects 3 3 Fixturing 3 3 8000 Series Probes 3 4 SECTION 4 Setup 4 1 Safety Instructions 4 1 Line Voltage Settings Fuse Panel 4 3 Adjusting the Handle Feet 4 4 Probe Installation Removal 4 5 Power Up 4 6 SECTION 5 User Interface 5 1 Overview 5 1 Front Panel Keypad 5 2 Men...

Page 7: ...lay 7 1 Introduction 7 1 AC Waveform Display Graphical Layout 7 1 Accessing the AC Waveform Display 7 2 Setting the Time Base 7 2 Setting the Vertical Scale 7 3 Trigger Operation 7 4 Trigger Channel Selection 7 5 Trigger Modes 7 5 Free Run 7 5 Auto 7 5 Repeat 7 5 Single 7 5 Trigger Slope 7 6 Trigger Level 7 6 SECTION 8 Remote Operation 8 1 Introduction 8 1 Communications Ports 8 2 RS 232 Port 8 2 ...

Page 8: ...mmon Command Syntax 8 18 IEEE 488 2 Common Command Descriptions 8 19 SCPI Command Syntax 8 22 SCPI Message Terminators 8 23 SCPI Meter Specific Commands 8 23 SCPI Command Descriptions 8 27 SECTION 9 Data Logging Utilities 9 1 Overview 9 1 Logging Data 9 2 Logging to USB Drive 9 2 Logging to Internal Drive 9 2 Screen Capture 9 3 SECTION 10 Firmware Update 10 1 Overview 10 1 Firmware Update Procedur...

Page 9: ...log Filter Selections 6 7 Table 6 4 Estimated Zeroing Times 6 9 Table 6 5 Update Interval Settings 6 12 Table 7 1 Time Base Selections for AC Filter Settings 7 3 Table 8 1 RS 232 Port Settings 8 4 Table 8 2 Common Command Summary 8 19 Table 8 3 SCPI Error Queue Commands 8 24 Table 8 4 SCPI System Information and Configuration Commands 8 24 Table 8 5 SCPI Status Register Commands 8 24 Table 8 6 SCP...

Page 10: ...creens 5 4 Figure 5 5 8000 Gaussmeter Menu Map 5 5 Figure 6 1 Setting the Units 6 2 Figure 6 2 Flux Density Reading 6 3 Figure 6 3 Range Settings 6 3 Figure 6 4 Measurement Mode Selection 6 5 Figure 6 5 Frequency Period Indicator 6 5 Figure 6 6 Analog Filter Selection 6 7 Figure 6 7 Auto Zero Menu Path 6 10 Figure 6 8 Manual Zero Menu Path 6 11 Figure 6 9 Update Interval Setting 6 12 Figure 6 10 H...

Page 11: ...e 8 10 Status Byte and SRQ Enable Register 8 14 Figure 8 11 Standard Event Register 8 16 Figure 8 12 Measurement Event Register 8 16 Figure 8 13 Operation Event Register 8 17 Figure 8 14 Questionable Event Register 8 17 Figure 9 1 Data Logging Menu Path 9 2 Figure 9 2 Example of Waveform Mode Screen Capture 9 3 Figure 10 1 Firmware Update Screen 10 1 Figure A 1 Flux Lines of a Permanent Magnet A 1...

Page 12: ... 8010 model features a single channel while the 8030 model provides three input channels Both models provide high accuracy suitable for use in the laboratory and enough features to be versatile in a manufacturing environment Table 1 1 on the following page provides a list of features Detailed descriptions of the 8000 Series Meter functions and features are provided in the remaining sections Note S...

Page 13: ...Readings Calculated by the Instrument and Signal Peaks Valleys of Rapid Changing Pulses Field Classifier With Pass Fail Outputs Remote Operation and Communications RS 232C Standard 9 pin female D connector Protocol SCPI 1999 Protocol IEEE 488 1987 2 w External Prologix Adapter Protocol IEEE 802 3u Data Link Layer TCP IP Transport Network Layer Ethernet Standard RJ 45 Interface 10 100 MHz Ethernet ...

Page 14: ...st convenient view of the information displayed Common functions are activated quickly through the front panel keypad with each channel having its own identical set of keys In addition each key has a back light that is illuminated to indicate that it is active Less commonly used functions are easily accessible through the menu system Auto Range Four measurement ranges may be selected manually or t...

Page 15: ...r the selection of either raw waveform or RMS output data and come with standard full scale output ranges of 3V and 10V full scale An adjustable full scale output up to 9 9V in increments of 0 1V is also available adjustable scale not supported Separate BNC outputs not associated with the probe input channels provide analog outputs for the Vector Summation 8030 Only and Auxiliary Analog outputs Au...

Page 16: ...e supplied with an internal HTML based remote monitoring and data logging application that when connected to a computer network can be accessed with standard web browser applications AC Waveform Display Mode The graphical AC Waveform Display mode allows users to look at AC measurements without the use of an external oscilloscope or other analog graphing device It provides operation and custom sett...

Page 17: ... Menu System Navigation 5 Range Key Selects Fixed Ranges or Auto Range 6 Mode Key Selects ac or dc Field Measurement 7 Reset Key Resets the Min Max and Peak Valley Detectors Used with the Hold Feature 8 Zero Key Starts the Zeroing Process 9 Relative Key Activates De activates the Relative Function 10 Manual Key Numeric Entry Menu Navigation 11 Probe Connector 12 Pin Non Magnetic Female Connector f...

Page 18: ...ated Analog Output Voltage Signal Standard BNC Connector 3 Fuse Chart Specifies the Proper Fuse Rating 4 Ethernet Port Standard RJ 45 Connector 10 100 MHz Ethernet Port 5 Power Receptacle Accepts an International Instrumentation Power Line Cord 6 Cooling Vent Vents for Cooling Fan Should Remain Clear 7 RS 232 Port RS 232 Serial Communication Port Standard 9 Pin D Type Female Connector 8 Digital I ...

Page 19: ...onsult your FW Bell sales representative for more information Figure 1 3 Various Positions of Meter Applications Sorting or performing incoming inspection on permanent magnets particularly multi pole magnets Testing audio speaker magnet assemblies electric motor armatures and stators transformer lamination stacks cut toroidal cores coils and solenoids Determining the location of stray fields aroun...

Page 20: ...type probes have a measurement limit of 1G 100µT on a single range Display resolution for MOS type probes is 10µG 1nT Display resolution for MOX type probes is 1µG 0 1nT but useful resolution is limited to 5 10µG 1nT due to noise drift Table 2 2 Ranges for Mid Field Probes 1x type gauss G tesla T oersted Oe ampere turn meter A m 30 0000 G 3 00000 mT 30 0000 Oe 2 38732 kA m 300 000 G 30 0000 mT 300...

Page 21: ...range 2mVrms 20mV p p NOTE Un corrected output polarity in AC mode is inverted with respect to the Corrected Output Analog Output Impedance 100 Ohms Analog Output Connector Standard female BNC Analog Output Scaling dc Mode 3V or 10V standard 0 1V to 9 9V adjustable with increments of 0 1 V ac Mode 3Vrms or 10Vrms standard 0 1Vrms to 9 9Vrms adjustable with increments of 0 1Vrms Front Panel Display...

Page 22: ...range DC to 100Hz AC accuracy in AC mode 2 0 of reading 0 15 of range 20 Hz to 50 kHz 2 0 of 3V or 10V ranges AC 20 to 500 Hz AC RMS DC 20Hz 50kHz See Figure 2 1 for Graph Typical AC and AC RMS DC output AC peak or valley Accuracy 5 00 of Reading N A N A Probes Errors Not Included See Table 6 2 regarding minimum AC signal requirements for rated accuracy Also refer to the end of Section 6 Sources o...

Page 23: ... 8 V typical Baud rate 9600 Stop bits 1 2 Character length 7 8 Parity None Handshaking None Standards supported SCPI 1999 Classifier Digital Outputs Signal Type Solid State Relay Closure Connector 15 Pin D Female Switching Voltage 30 V DC or AC Peak MAX Switching Current 0 100 A DC or AC Peak MAX On State Resistance 25 Ω MAX Operating Time Including Bounce 3 mS MAX Table 2 5 Classifier Connections...

Page 24: ...lass A Emissions CISPR 11 2009 A1 2010 Radiated and Conducted Emissions EN 61010 1 2010 06 Safety Requirements for Electrical Equipment for Measurement Control and Laboratory Use EN 50581 2012 Reduction of the Use of Hazardous Substances Calibration Service The instrument is calibrated at the factory prior to shipment To maintain rated accuracy it is recommended that the instrument and any accompa...

Page 25: ...ngth 50 8 mm 2 Diameter 8 7 mm 0 343 Attenuation 80 dB to 30 mT 300 G Figure 2 3 YA 111 Zero Flux Chamber Model Number YA 112 Cavity Dimensions Length 280 mm 11 Diameter 12 7 mm 0 75 Attenuation 60 dB to 30 mT 300 G Figure 2 4 YA 112 Zero Flux Chamber Purpose To shield the probe from external magnetic fields during the ZERO or RELATIVE operations ...

Page 26: ...ly transverse probes are used to make measurements between two magnetic poles such as those in audio speakers electric motors and imaging machines Axial probes are often used to measure the magnetic field along the axis of a coil or solenoid Either probe can be used where there are few physical space limitations such as in geomagnetic or electromagnetic interference surveys The low field probes ar...

Page 27: ...ilities and resolutions Table 3 1 Probe Maximum Field Levels and Resolutions Probe Type Maximum Field Display Resolution MOS Low Field 1G 100µT 10µG 1nT MOX Low Field 3 G 300 µT 1 µG 0 1 nT Medium Field 30 kG 3 T 0 1 mG 0 01 µT High Field 300 kG 30 T 1 mG 0 1 µT Note Low Field MOX probes have an upper calibrated range of 2G but will respond to 3G with increased error MOS probes have a measurement ...

Page 28: ...eled using the instrument s zero function However the probe s offset and sensitivity will change with temperature Using temperature compensated probes can minimize these effects if the probe is operated over a temperature range outside of 23 3 C There can be substantial errors in uncompensated probes A typical probe s dc offset can change by 0 1 G C 10 µT C It is best to allow the probe s temperat...

Page 29: ...F W BELL 8000 Series Gauss Tesla Meter Instruction Manual Section 3 Probes 3 4 8000 Series Probes Figure 3 2 Hall Probe Configurations ...

Page 30: ...inoperative and be secured against any unintended operation For example safety may be impaired if the instrument fails to perform or shows visible damage CAUTION All input and output voltages except line mains are less than 20V WARNING The opening of covers or removal of parts might expose live parts and accessible terminals which can be dangerous WARNING Any interruption of protective earth condu...

Page 31: ...easuring device The probe is not to contact a surface which exceeds a voltage of 30Vrms 42 4V peak or 60V dc Figure 4 1 Probe Electrical Warning CAUTION This instrument may contain ferrous components which will exhibit attraction to a magnetic field Care should be utilized when operating the instrument near large magnetic fields as pull in may occur ...

Page 32: ...le It is designed to accept an international instrumentation power cord This receptacle also contains the fuse Remove the power cord On the right side of the receptacle is a slot Insert a narrow screwdriver and gently release the access door the door will not open unless power cord is removed The door will swing out toward the right 2 See figure 4 2 Remove the fuse by pulling straight out On the b...

Page 33: ...whenever the meter needs to be carried The meter has two feet on the bottom as shown below which can easily be extended or collapsed to adjust the viewing angle of the front panel as preferred CAUTION The feet lock into place and must be pulled away from the case before folding toward the rear to prevent breaking the feet Figure 4 3 Adjusting the Handle and Feet ...

Page 34: ...There is no twist lock so it is not necessary to rotate any part of the connector To remove the connector grab at the collar and slide back The probe connector cannot be removed by pulling only on the rear of the connector body Note You may install or remove a probe at any time although it is not recommended to do so during the zeroing operation For more information on probes see Section 3 Probes ...

Page 35: ...andby mode and power is applied To turn ON the meter press the button and release The switch color will change to blue and the boot up procedure will begin To shut the instrument off press the Standby button and release After a few seconds the unit will shut off and the Standby button will return to the red strobe Note Allow at least 3 seconds for the instrument to be off before turning it back on...

Page 36: ...il an error message will appear and the instrument may halt the power up procedure for major errors Refer to Appendix C of this manual for a listing of error codes Upon successful completion of the diagnostics and initial calibration the instrument will be ready to use Active keys on the front panel are illuminated and present flux density readings and status are displayed Other parameters such as...

Page 37: ...F W BELL 8000 Series Gauss Tesla Meter Instruction Manual Section 4 Setup 4 8 This Page Intentionally Blank ...

Page 38: ...e input channel has its own dedicated set of keys that control commonly used functions and the remaining functions are accessed through the menu system This section of the manual describes how the user interface to 8000 Series Gaussmeters is organized including keypad layout and menu organization Operation and general considerations relating to flux density measurements and function operations are...

Page 39: ...probe input channel there is a set of keys associated with that channel This set includes Range Mode Hold Reset Rel Zero and the Manual adjust keys as shown in Figure 5 1 b Refer to Figure 1 1 on page 1 7 for a complete diagram of the front panel keypad layout 5 1 a Menu keys 5 1 b Channel Keys Figure 5 1 Front Panel Key Sets Each key features a back light that will illuminate indicating that it i...

Page 40: ...of the display as shown in Figure 5 2 The selected menu or sub menu is identified in the bottom block highlighted in blue To navigate the menu system simply press the menu hot key that corresponds to the menu selection or function desired To return to the previously accessed menu press the Menu button Pressing the Menu button multiple times will return the display to the Main menu Table 5 1 Menu K...

Page 41: ...d in yellow as shown with the 30G range in the following example depicted in Figure 5 3 Figure 5 3 Menu Selections Example Note Some menu selections differ based on the specific model number Menu selections or paths for different models are indicated by dashed boxes Special Menu Screens Some menus selections have special menu screens that can be accessed For example the Main System Firmware Update...

Page 42: ...8000 Series Gauss Tesla Meter Instruction Manual Section 5 User Interface 5 5 MENU SYSTEM Continued The complete 8000 Series Gaussmeter menu system map is shown in Figure 5 5 Figure 5 5 8000 Gaussmeter Menu Map ...

Page 43: ...ernal flash memory These setups are saved in non volatile memory and may be recalled at anytime including after a power on off cycle The settings from all menus are saved including those enabled remotely or from the front panel To Save or Recall a Configuration Setup 1 From the MAIN menu navigate to the SYSTEM menu and select User Setup Save Recall 2 Use the number entry hot keys to enter the desi...

Page 44: ...Zero All Channels and Vector Summation FILTER Analog Filter High Freq All Channels DISPLAY Update Rate 1 sec Channel 1 Enabled Channel 2 8030 only Enabled Channel 3 8030 only Enabled Vector Sum Disabled Brightness Settings Mid Level Display and Buttons Numeric Enabled Waveform Disabled RELATIVE Active Disabled All Channels and Vector Summation Value 0 00000 T All Channels and Vector Summation RS23...

Page 45: ...esired hot key button and edit the number as desired 3 After all the fields have been edited pressing the Set Date and Time hot key will set the date and time and the meter will display a message that the Date and Time Have Been Set Table 5 3 12 hour to 24 hour Conversion Chart 12 Hour Format 24 Hour Format 12 Hour Format 24 Hour Format 12 am 00 hours 12 pm 12 hours 1 am 01 hours 1 pm 13 hours 2 a...

Page 46: ...refresh the display Pressing the Clear All hot key will delete all entries from the error log and refresh the display Power On Options The meter allows the user to select what happens when AC power is applied to the meter s line cord This option requires v1 1 or newer firmware for the front and back panel FP BP microcontrollers and v1 6 0 or newer main operating firmware Older versions will not ha...

Page 47: ...F W BELL 8000 Series Gauss Tesla Meter Instruction Manual Section 5 User Interface 5 10 This Page Intentionally Blank ...

Page 48: ...netic field measurement operations for the 8000 Series gauss tesla meters Each of the meter s functions and features relating to field measurement is described in detail This includes general considerations technical information and instructions on how to use each feature or function For a general discussion concerning the user interface see Section 5 User Interface ...

Page 49: ... of the measurement when selected Table 6 1 lists the available units for each parameter Table 6 1 Available Units Quantity Units Flux Density Gauss G Tesla T Oersted Oe Ampere meter A m Temperature Fahrenheit F Celsius C Kelvin K Angle Degrees deg Radians rad Time Frequency Period Hertz Hz seconds Sec Setting the Units To change the units 1 From the main menu choose UNITS 2 For each quantity pres...

Page 50: ...ndicator Flux Density Reading Units Figure 6 2 Flux Density Reading Measurement Range Selection The meter is capable of providing flux density measurements on one of four fixed ranges or it can be set to automatically select the best range for the present flux density being measured The available ranges are listed in Section 2 Specifications The ranges advance in decade steps and the magnitudes av...

Page 51: ... caused the over range condition will be displayed to the left of the OverRange message Note Using Auto Range with high crest factor signals or pulses may cause toggling of the range setting if the peak is considerably higher than the average or rms value of the signal and exceeds the full scale value For this type of signal it is best to use a fixed range setting In firmware v1 6 0 and newer if t...

Page 52: ...y using the AC mode to determine the magnitude of the AC component Analog outputs are discussed later in this section AC Mode Operation It is possible for the flux density signal to contain both a DC component and an AC component In the AC mode the value displayed is the true RMS value of the waveform with its DC component removed If the DC component is very large compared to the AC component up t...

Page 53: ...ating in AC mode one of six analog filter modes can be selected as shown in Table 6 3 These filters affect the displayed reading and analog outputs As shown in Table 6 3 the Full Bandwidth frequency filter selection utilizes the full bandwidth of the 8000 Series Gaussmeter The other filter selections can be used to narrow or focus the bandwidth of the meter s analog amplifiers to minimize influenc...

Page 54: ...Hz to 500 Hz No Corrections 1Hz to 50 kHz Setting the Analog Filters To select the analog filter 1 Navigate the menu system to select the desired channel then choose AC Freq Setup and select the appropriate filter Figure 6 6 Analog Filter Selection NOTE When operating the meter in Waveform display mode all signals will be displayed on a common time base and the setting of the AC Freq Setup for All...

Page 55: ...tic field roughly 0 5 gauss or 50 µT can introduce errors in the final reading For most situations it is preferable to shield the probe from all external magnetic fields prior to zeroing For this reason the 8000 Series Meters are provided with a zero flux chamber which is capable of shielding against fields as high as 30mT 300G The probe is simply inserted into the chamber before the zeroing proce...

Page 56: ...requires a substantially longer zeroing period but offers the best performance for all AC measurement modes The estimated zeroing times for each of these modes is shown in Table 6 4 Table 6 4 Estimated Zeroing Times Zeroing Mode Estimated Zeroing Time DC Only 30 seconds Basic DC Basic AC 60 seconds Advanced DC Advanced AC 90 seconds NOTE The process of zeroing also affects other functions such as ...

Page 57: ...er to prompt the user to zero a channel The meter was just turned on A probe was just inserted into the meter Fifteen 15 minutes has elapsed since a probe has been inserted Sixty 60 minutes has elapsed since the meter was turned on The meter s internal temperature has drifted by at least 5 C since the last zero operation only applied after 60 minute warm up period is complete The meter was zeroed ...

Page 58: ...pressing the left or right side of the Manual button or by pressing the corresponding menu hot key button Pressing the Reset button resets the manual zero value to zero and backing out of the menu with the value at zero turns off the manual zero feature While manual zero is active this value will be added to or subtracted from all future readings NOTE Attempting to enter manual zero values larger ...

Page 59: ...ensity levels to be observed Longer update intervals provide higher resolution accuracy and stability of the flux density reading by averaging more samples to obtain a reading The Update Intervals are shown in Table 6 4 Table 6 5 Update Interval Settings 5 Readings per Second 2 Readings per Second 1 Readings per Second 0 5 Readings per Second Configuring the Update Interval 1 From the main menu ch...

Page 60: ...to track rapid events such as magnetizing pulses Unlike MIN and MAX PEAK and VALLEY are not arithmetically averaged by the meter They represent the instantaneous extremes of a flux density waveform as they have been captured within the bandwidth of the meter In AC mode the analog filter selection will also affect the peak and valley hold operation such that lowering the bandwidth and by extension ...

Page 61: ...n s Figure 6 10 Hold Features Settings Hold functions that are enabled in the HOLD menu will be highlighted yellow Using the HOLD Function To activate de activate the hold function s 1 Using the channel keys press the HOLD key 2 Use the channel Hold menu system to activate Note Using the Hold menu is the only way to activate the Vector Sum Min Max Hold functions 8030 only The HOLD and RESET keys w...

Page 62: ...s Manual Relative feature note the Manual Relative feature is not supported There may be situations when the user may prefer to shield the probe from all external magnetic fields prior to performing a relative operation Provided with the instrument is a zero flux chamber which is capable of shielding against fields as high as 30 mT 300 G or 23 88 kA m The probe is simply inserted into the chamber ...

Page 63: ...lays a value that was the present flux density reading before the relative key was pressed see Figure 6 9 The present flux density reading should then display a value of zero All readings from this point forward are relative and not absolute The relative value is subtracted from all future readings In the relative mode a reading of zero indicates that the actual flux density being measured is equa...

Page 64: ...lue from the Measurement Screen Once the relative value is set either from the front panel or from the auto relative menu button its value may be adjusted manually To manually adjust the relative value enter manual relative mode by pressing the manual relative menu button The menu will change to show the manual relative input controls and using the menu buttons the user can enter a value by select...

Page 65: ...e orientation of the probe and location of the X hall effect element is specified with a painted mark or V notch The straight side of the painted mark is parallel with the Y axis Figure 6 11b is an inside view that shows the locations of the X Y and Z hall effect elements The planes of the three Hall elements are orthogonal with one another A positive magnetic field entering the hall elements alon...

Page 66: ...les between R and the X Y and Z axes On the display vector angles are indicated as X Y and Z corresponding to θX θY and θZ respectively Vector Summation and Relative Mode Operation If the relative mode is enabled for individual channels the meter will use those readings when calculating the vector summation When all three channels are in relative mode a vector difference is calculated using the fo...

Page 67: ...configured and activated de activated through the menu system To configure or activate vector summation functions 1 From the main menu choose Channels 2 From the channels menu choose Vector Sum 3 Choose and set up the functions needed 4 Select Display to enable the vector sum display Note The Vector sum display can also be enabled by using the Display menu as previously shown Figure 6 16 Vector Su...

Page 68: ...oltmeter oscilloscope recorder or external analog to digital converter Modes of Operation Both the corrected and uncorrected analog outputs offer two modes of operation Setting the analog output to RMS mode for both DC and AC measurement modes sets the analog output to generate a scaled DC analog voltage that corresponds to the displayed measurements The only difference between corrected and uncor...

Page 69: ...ad to problems if the analog signal is being used to make decisions because there is no indication that a range change has occurred In these situations it is best to select a fixed range that covers the expected flux density span Using the Vector Summation Analog Output Full scale for the vector summation output will correspond to the full scale range of the channel with the highest range setting ...

Page 70: ...ensity Measurement 6 23 Analog Outputs Continued Configuring the Analog Outputs 1 From the main menu choose ANALOG OUTPUT 2 Select the channel or vector sum 8030 only 3 Select corrected or uncorrected 4 Set the analog output mode and scaling Figure 6 17 Analog Output Settings ...

Page 71: ... value sets the upper limit and the other sets the lower limit For DC mode operation polarity information must be specified With AC mode only magnitude values may be set The meter will retain DC polarity information when switching between AC and DC modes Example Circuit for Classifier Outputs Figure 6 16 shows an example circuit for using the classifier outputs These outputs are in the form of gen...

Page 72: ... lines passing through it but also the angle at which they pass through it The Hall Effect sensor produces the greatest signal when the flux lines are perpendicular to the sensor as shown below Figure 6 19 Probe Output versus Flux Angle Note The probe is calibrated and specified with flux lines passing perpendicularly through the Hall effect sensor with the probe positioned for a maximum reading i...

Page 73: ...up phase after power up 15 minutes Allow the meter and probe to stabilize for approximately 60 minutes for best accuracy 7 The inherent loop area of the Hall plate and the wiring in the probe stem and body can be subject to inductive coupling which may produce errors especially at high frequencies The correction factors for probe frequency response are obtained with only the tip of the probe expos...

Page 74: ... simple enough that even novice users will be able to set up and capture AC mode measurements easily Inside the AC Waveform Display menus users can adjust the time and vertical measurement scales chose several different trigger modes and enter customizable trigger levels and slopes that make it possible to capture repetitive and transient measurement events AC Waveform Display Graphical Layout Cha...

Page 75: ...de and for an 8030 the channel must be active Setting the Time Base From the Waveform Settings menu accessing the Time Base menu brings up a row of hot keys that set the time per division for the horizontal time scale of the waveform display The time base horizontal scale selection range is associated with the AC Freq Setup menu selection such that one of six values are available that will scale t...

Page 76: ... 00ms 6 40ms 6 40ms 6 4ms 128ms 16 0ms Setting the Vertical Scale From the Waveform Settings menu accessing the Scale menu brings up a row of hot keys that set the units per division measurement for the vertical value of the waveform display The vertical scale selection range is associated with each channel s input range such that one of six values is available to scale the display within that cha...

Page 77: ...orm display set up the desired AC Frequency Filter time base vertical range and scale trigger mode slope trigger level and trigger channel 8030 only settings and press the Run button Depending on various settings the meter s trigger status line will display Waiting Running or Stopped Waiting Indicates that the meter is looking for or waiting for a valid trigger event Running Indicates that a trigg...

Page 78: ...utside of the trigger level while still displaying a waveform Auto In Auto trigger mode the meter continuously and automatically calculates an appropriate trigger level based on the data being sampled by the meter This trigger level combined with a positive going slope initiates a trigger event and causes the meter to display data associated with that trigger Repeat Repeat mode is similar to auto ...

Page 79: ...dicator on the waveform display Trigger Level The trigger level can be set manually by entering the trigger level menu and using the hot keys to move the active digit to the left or right increment or decrement the active digit change the polarity of the level entry or reset the level to zero The input trigger level is used in combination with the slope setting to create a trigger point level in R...

Page 80: ...he IEEE 488 2 1987 standard was a step toward creating a universal way to communicate with any instrument regardless of the manufacturer or the type of instrument used It defined a set of common commands that all instruments should respond to in a predictable manner Yet it did not specify which features or commands should be implemented for a particular instrument Later the SCPI 1999 standard Soft...

Page 81: ...low of data between the instrument and the computer For example if the computer is receiving data from the instrument but is interrupted by another task it may want to halt the instrument s transmission until it has completed that task This can be accomplished in one of two ways Hardware Handshaking Two lines called Clear To Send CTS and Request To Send RTS are used to control the flow of data Thi...

Page 82: ...00 Series Meter RS 232 communications port Figure 8 1 RS 232 Connector Configuration To setup the RS 232 communications port navigate from the MAIN menu to SYSTEM COMM SETUP RS232 CONFIGURATION This will open the RS 232 setup screen where the serial transmission characteristics such as baud rate parity setting etc can be modified Figure 8 2 RS 232 Setup Screen The lists of possible selections are ...

Page 83: ... Functional Description The 8000 Series Gaussmeters are equipped with a standard 10 100MHz Ethernet port via a RJ 45 connector on the back panel This port supports TCP IP communications and provides the user access to the system s internal web based application interface It is designed to connect directly to computer networks using a standard patch cable T568B as shown below Direct connection to c...

Page 84: ... sets the meter to automatically obtain an IP address from the network Pressing the Change Addr Mode button will change the system network configuration to Manual and will bring up additional menu selections that will allow the user to specify a static IP Netmask Gateway and DNS Server addresses After making changes to the network configuration pressing the Save and Reboot menu button will save th...

Page 85: ...nsult your application s help files for more detailed descriptions and operating instructions Open the Telnet Client and at the command prompt use the open port command open hostname port where the hostname is your meter s network IP address and the port is 5024 See below Note Port 5024 is a registered transport protocol port number for SCPI TELNET Once connected you may use the escape character t...

Page 86: ...meter connected to a computer network navigate from the MAIN menu to SYSTEM COMM SETUP NETWORK CONFIGURATION menu and determine the meter s IP address or the use manual address mode to set an IP address Note In DHCP mode the network connection must be installed and active during meter boot up this is the only time the network card assigns an IP address in DHCP mode Open a web browser application W...

Page 87: ...s application is limited to twice per second and may vary based on network speed and or available bandwidth In either event this will not affect the meters display or data log update rates Date and Time The Date and Time window allows the remote user to manually enter and set the meter s date and time or use the time from the remote computer to set the meter s date and time Meter Info The Meter In...

Page 88: ...ion by Ctrl left clicking each file and then right clicking over one of the selected files Channels and Vector Sum Each Channel window only one for the 8010 model and the Vector Sum window 8030 only has controls that give the remote user the ability to set the following Enable Auto Range Set the Range Set the Mode Set the AC Frequency Filter AC mode only Set the Zero mode Initiate channel Zeroing ...

Page 89: ...uisition system As a talker the device sends device dependent data across the bus but only when commanded to do so by the controller As a listener the device receives device dependent data from a talker and there can be many listeners at any given time The bus is implemented on a standard 24 pin connector as shown below Pin 1 2 3 4 13 14 15 16 Data DIO These are the eight data lines DIO1 through D...

Page 90: ...ound Pin 12 Implementation The 8000 Series Gaussmeters implement GPIB communications using an externally connected Prologix GPIB USB Controller through the meter s front panel USB port The Prologix GPIB USB controller is not included with the meter and can be purchased through distribution or directly from Prologix visit www prologix biz for more information The GPIB USB controller converts any co...

Page 91: ...munications is the instrument address This may be any value between 0 and 30 Navigating the system menu from Main to System Comm Setup GPIB Configuration will bring up the GPIP configuration screen as shown below Use the hot keys to set the desired address Figure 8 8 GPIB Configuration Screen Note The Prologix GPIB USB Controller will be set by the meter to this address ...

Page 92: ...ister set consists of three individual registers as shown below Figure 8 9 Condition Event and Enable Registers The CONDITION register is a real time read only register that is constantly updated to reflect current operating conditions The EVENT register is fed by the CONDITION register but operates as a latch Whenever any bit in the CONDITION register goes to 1 a corresponding 1 is latched into t...

Page 93: ...e which instrument s require service On the RS 232 port there is no hardware method of signaling a service request so the STATUS BYTE must be inspected polled to determine if service is required The RQS bit can set if any of the summary bits from the MEASUREMENT EVENT OPERATION EVENT STANDARD EVENT or QUESTIONABLE EVENT registers are set or if an error or output message is ready to be transmitted ...

Page 94: ...set MAV Message Available This bit is always set Because the GPIB to USB controller only has an output message queue of one each time the serial interface gets a command that requires a response that is sent immediately with out using an output queue EAV Error Available This bit sets any time there is an error message available in the error queue RSQ Request For Service If any of the other bits in...

Page 95: ...ice Dependent Error Indicates that the instrument did not operate properly due to some internal error QYE Query Error Indicates that an attempt was made to read an empty output queue OPC Operation Complete Indicates that all requested operations have been completed Measurement Event Register If any of these bits set and their respective enable bits are set the Measurement Summary Bit MSB will set ...

Page 96: ...nels have been turned off ZERO The instrument is presently performing a zeroing operation MEAS1 MEAS2 MEAS3 Indicates the instrument is performing a measurement on channel 1 2 or 3 respectively RANG1 RANG2 RANG3 The instrument is presently ranging on channel 1 2 or 3 respectively CAL The instrument is presently performing an internal calibration Questionable Event Register If any of these bits set...

Page 97: ...the acronym it will always be a question mark and indicates that information is being requested from the instrument For instance a command to read the model number and manufacturer of the instrument is IDN 4 If a parameter follows a command it must be separated from the acronym by at least one space The parameter is the ASCII representation of a decimal integer For instance if the parameter to be ...

Page 98: ...te enable Disable front panel controls GTL Go to local Enable front panel controls SAV n Save Setup Save the existing meter setup in one of ten non volatile memory locations RCL n Recall Setup Replaces the existing meter setup with one of ten stored in non volatile memory NOTE The parameter NRf means Numeric Representation format and is required CLS CLEAR STATUS Clears the MEASUREMENT EVENT OPERAT...

Page 99: ...cters in length such as 9923009 If the probe is missing a 0 will be returned This sequence is repeated for Channel 2 and 3 All strings are separated by commas For instance if only Channel 2 s probe is attached the returned string will be 0 0 STF81060815T 9923009 0 0 RCL n RECALL SETUP The present state of the instrument called the setup can be saved in non volatile memory and later recalled with t...

Page 100: ...primarily intended for use with the RS 232 port but can be used on the GPIB bus GTL GO TO LOCAL This command cancels remote mode and restores front panel operation This command was primarily intended for use with the RS 232 port but can be used on the GPIB bus SAV n SAVE SETUP The present state of the instrument called the setup can be saved in non volatile memory Up to ten different setups can be...

Page 101: ... has more than four letters and the fourth letter is a vowel drop it and all letters that follow it For instance the command INPUT can be shortened to INP c If the command has more than four letters and the fourth letter is a consonant drop all letters that follow it For instance the command MEASURE can be shortened to MEAS d If the command contains a question mark or a non optional parameter it m...

Page 102: ...Meter Specific Commands In the following tables and descriptions the commands are written such that the short form of the command is written in UPPER CASE letters and the remainder of the command is written in lower case letters Either form can be used If parameters are required they will appear within brackets A b parameter indicates a Boolean function either 0 or OFF or 1 or ON A n parameter is ...

Page 103: ...ERation ENABle NRf Set the Operation Event Enable register STATus QUEStionable ENABle NRf Set the Questionable Event Enable register STATus MEASurement ENABle Query the Measurement Event Enable register STATus OPERation ENABle Query the Operation Event Enable register STATus QUEStionable ENABle Query the Questionable Event Enable register STATus MEASurement CONDition Query the Measurement Conditio...

Page 104: ... CALCulate LIMit STATe Query classifier operation setting CALCulate LIMit FAIL Query classifier pass fail status Table 8 10 SCPI Measurement Commands COMMAND DESCRIPTION MEASure FLUX Query flux density measurement at same rate as display MEASure FLUX FAST Query flux density measurements at a rate defined by the FAST rate setting MEASure FLUX STReaming n Query and stream flux measurement readings o...

Page 105: ...TPut CORRected SCALing n Set the scaling of the corrected analog output OUTPut CORRected SCALing Query the scaling of the corrected analog output OUTPut VECTorsum MODe n Set the output mode of the vector sum analog output OUTPut VECTorsum MODe Query the output mode of the vector sum analog output OUTPut VECTorsum SCALing n Set the scaling of the vector sum analog output OUTPut VECTorsum SCALing Qu...

Page 106: ...fined messages while positive numbers relate specifically to the instrument The error queue can hold up to 25 messages Each time the queue is read an error message is reported if no errors exist the message 0 No error will be returned If the queue is full the message 350 Queue Overflow will occupy the most recent queue location It is an indication that at least one perhaps more error message s wer...

Page 107: ... clock supports 24 hour format and can only be set using the 24 hour format See Table 5 3 for 12 hour to 24 hour conversions SYSTem TIMe The contents of the instrument s real time clock will be returned in using the following format hour minute second where hour is in the range of 0 23 24 hour format minute is in the range of 1 59 second is in the range of 1 59 SYSTem DATe NRf NRf NRf The instrume...

Page 108: ...ts of the specified EVENT register and then clear that event register contents STATus MEASurement ENABle NRf STATus OPERation ENABle NRf STATus QUEStionable ENABle NRf These commands program the specified EVENT ENABLE register with the value NRf NRf is an ASCII string representing an integer mask For instance a value of 45 decimal is the same as binary 00101101 thus setting bits 5 3 2 and 0 in the...

Page 109: ...are to be in Celsius C or CEL Fahrenheit F or FAR or Kelvin K UNIT TEMPerature Returns an ASCII string representing the temperature units The ASCII string will be CEL for Celsius FAR for Fahrenheit or K for Kelvin UNIT FLUX GAUSs TESLa AM OERSted Specifies that the flux density units are to be in gauss GAUSs tesla TESLa amps per meter AM or oersted OERSted UNIT FLUX Returns an ASCII string represe...

Page 110: ...AUTo b SENSe FLUX AC RANGe AUTo b Specifies that the measured flux density will be static DC or alternating AC and that AUTO ranging is turned OFF when b is 0 or ON when b is 1 When AUTO range is turned on the instrument determines the range that will offer the best resolution When AUTO range is turned off the range will be fixed to the last range that was in use when the command was issued SENSe ...

Page 111: ...Rf CALCulate LIMit UPPer DATa NRf Specifies the upper and lower classifier limit value NRf is a signed decimal number that sets the lower and upper classifier limits NRf must be between 0 0000000000 and 29999999 The meaning of the limit depends upon the selected unit of measure gauss tesla etc For instance the value 1 0203 could mean 1 0203 G or 1 0203 T If a lower limit is specified that is arith...

Page 112: ... MEASure FLUX command is issued 10 times per second the same reading may be returned 10 times before a new reading is available If no probe is present the string NPC is returned MEASure FLUX FAST Similar to the normal MEASure FLUX command but will return values at the rate determined by the MEASure FLUX FAST RATE setting If no probe is present the string NPC is returned At faster update rates accu...

Page 113: ...n 1 Medium Frequency 20Hz 10kHz n 2 Low Frequency 20Hz 500Hz n 3 XLow Frequency 1Hz 500Hz n 4 Full Bandwidth 1Hz 50kHz n 5 FBWNC 1Hz 50kHz w No Correction Zeroing Commands These commands control zeroing of the Hall probe and the instrument Since these commands are channel specific the in each command should be replaced with the channel number 1 2 or 3 If the channel number is omitted then Channel ...

Page 114: ... 4 affects the relative functions for vector summation INPut OFFSet NRf This command defines a fixed relative offset value which will be subtracted from all measured values The relative offset value will only be used when the RELATIVE function is enabled See the INPut OFFSet STATe command for details NRf is a signed decimal number between 0 0000000000 and 29999999 The meaning of the offset depends...

Page 115: ...he instrument provides a corrected and uncorrected analog output for each channel The 8030 models also provide an analog output for the vector summation These commands specify the output configuration by setting the output mode and scaling options Note The Vector Sum output does not have a waveform output mode and can only be turned on and off Selecting waveform or RMS modes will turn it on Since ...

Page 116: ...f 189 3 mT will result in an analog output of 1 893 volts If on the 3 kG range a reading of 2 6 kG will result in an analog output of 2 6 volts Some data acquisition systems may require different analog input ranges For example assume such a system cannot accept signals greater than 2 0 volts In this case you can specify 2 0V as the full scale range of the analog output NRf 2 0 The relationship be...

Page 117: ...the state of the instrument s hold features Since these commands are channel specific the in each command should be replaced with the channel number 1 2 or 3 If the channel number is omitted then Channel 1 is assumed A channel number of 4 affects the hold functions for vector summation Note The Vector Sum hold functions do no include Peak or Valley detection The use of 4 in these commands is not s...

Page 118: ... CALCulate HOLD PEAK CLEar The value being held by the PEAK HOLD function is reset to 0 CALCulate HOLD PEAK Returns the value being held by the PEAK HOLD function The value will be between 0 0000000000 and 29999999 The meaning of this value depends upon the selected unit of measure gauss tesla etc For instance the value 1 0203 could mean 1 0203 G or 1 0203 T CALCulate HOLD VALLey STATe b The VALLE...

Page 119: ... into Microsoft Excel or other similar spread sheet software tools NOTE Each CSV file is limited to 1 million rows After this limit is reached the log file will be closed and data logging will stop When data is logged to a USB drive the files are stored in file path named fwb8000 data If this file path is not already stored on the drive the meter will create it Data is logged at the same rate as t...

Page 120: ... the dialog box and continue If a USB memory drive is not detected a pop up screen will alert the user to install the drive and press the Enter button to continue Logging to Internal Drive Similarly pressing the Log to Internal Drive hot key button and the Start Data Logging button initiates data logging to the Internal Flash Drive and changes the menu hot key to Stop Data Logging Pressing the Sto...

Page 121: ... the Enter button Pressing the Enter button after arming the screen capture feature will write the image jpg to the USB drive and will open a dialog box that shows the path and name of the file Press Enter again to continue Before pressing the Enter button but after arming the screen capture feature the user may navigate to different menus and or modes of operation to capture the desired image For...

Page 122: ...F W BELL 8000 Series Gauss Tesla Meter Instruction Manual Section 9 Data Logging Utilities 9 4 This Page Intentionally Blank ...

Page 123: ...n by asking the user to press the Enter button When the Enter button is pressed the meter will begin the update process and re boot from the new firmware Note If either the network or USB drive is not present before entering this menu the meter will display a message warning the user Note If the network is present but the internet is unavailable the Internet version will be N A without any other i...

Page 124: ...monly used Flux density also called magnetic induction is the number of flux lines passing through a given area It is commonly assigned the symbol B in scientific documents In the cgs system a gauss G is one line of flux passing through a 1 cm2 area The more commonly used term is the tesla T which is 10 000 lines per cm2 Thus 1 tesla 10 000 gauss 1 gauss 0 0001 tesla Magnetic field strength is a m...

Page 125: ...flux lines pass through the material producing a positive voltage in one direction and a negative voltage in the other If the same number of flux lines passes through the material in either direction the net result is zero volts This sensitivity to flux direction makes it possible to measure both static DC and alternating AC magnetic fields The Hall voltage is also a function of the angle at which...

Page 126: ...rm manual calculations The classical approach to defining the location of a point in a two dimensional plane involves the use of the Cartesian coordinate system shown in Figure B 1 In this system a point can be defined by its combined horizontal x and vertical y distance from the origin of the graph the point where the x axis and y axis intersect In the example shown the point has coordinates of x...

Page 127: ... from 180 to 270 degrees and Q IV from 270 to 360 degrees The angle α can be calculated as follows α cos 1 x r cos 1 3 5 83 59 0 degrees Figure B 2 Vector Angle in a Two Dimensional System A similar system can be used to define a point in three dimensional space as visualized in Figure B 3 In this system a point can be defined by its combined horizontal x vertical y and depth z distance from the o...

Page 128: ...ional system it is often important to determine the angles between each axis and the summation vector in a three dimensional system as shown in Figure B 4 The angles can be calculated as follows α cos 1 x r cos 1 12 14 32 33 0 degrees β cos 1 y r cos 1 6 14 32 65 2 degrees y cos 1 z r cos 1 5 14 32 69 6 degrees Figure B 4 Vector Angles in a Three Dimensional System ...

Page 129: ... requested 13 The I2C bus has failed on this analog card Analog card I2C failure 14 The 10mA Ac and DC probe excitation currents are not within tolerance 10mA AC DC Ic out of range 15 The 6 3mA Ac and DC probe excitation current are not within tolerance 6 3mA AC DC Ic out of range 16 The 0 63mA AC and DC probe excitation currents are not within tolerance 0 63mA AC DC Ic out of range 17 The 100mA A...

Page 130: ...c Errors Error Code Description SCPI Text 100 SCPI command error Command error 200 SCPI execution error Execution error 300 SCPI device specific error Device specific error 350 SCPI error queue overflow Error queue overflow 400 SCPI query error Query error 500 SCPI power on event Power on event ...

Page 131: ...RESSLY IN LIEU OF ALL OTHER WARRANTIES EXPRESSED OR IMPLIED AND ALL OTHER OBLIGATIONS AND LIABILITIES ON THE PART OF OECO AND NO PERSON INCLUDING ANY DISTRIBUTOR AGENT OR REPRESENTATIVE OF OECO IS AUTHORIZED TO ASSUME FOR OECO ANY LIABILITY ON ITS BEHALF OR ITS NAME EXCEPT TO REFER THE PURCHASER TO THIS WARRANTY THE ABOVE EXPRESS WARRANTY IS THE ONLY WARRANTY MADE BY OECO OECO DOES NOT MAKE AND EX...

Page 132: ...OECO LLC 4607 SE International Way Milwaukie OR 97222 Phone 503 659 5999 www fwbell com ...

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