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32

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HAPTER

3:

Operation

F71/F41 Teslameter

3.5.6 Temperature
Compensation

All standard Hall probes have a built in temperature sensor located near the Hall sen-
sor. This sensor allows for automatic temperature compensation over the standard
operating range. Temperature compensation can be disabled in the Temperature tab
of the Measurement Setup screen.

Manual temperature compensation is available when using non-standard probes
that do not contain a temperature sensor or when operating at a temperature beyond
the range of the temperature sensor. In the Temperature tab, change the compensa-
tion Source from Temperature Sensor to Manual. This will reveal the Compensation
setting which must be set to the temperature at which the Hall probe sensor is oper-
ating. The manual compensation temperature can be set via the front panel or
through serial commands, for example:

SENSe:TCOMpensation:MTEMperature

FIGURE 3-25

Temperature compensation

FIGURE 3-26

Manual temperature compensation

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Содержание F71

Страница 1: ...No government or other contractual support or relationship whatsoever has existed which in any way affects or mitigates proprietary rights of Lake Shore Cryotronics Inc in these developments Methods a...

Страница 2: ...ore undertakes no responsibility that the products will be fit for any particular purpose for which you may be buying the Products Any implied warranty is limited in duration to the warranty period No...

Страница 3: ...s result of any changes made to the firmware FIRMWARE LICENSE AGREEMENT CONTINUED Under the terms of this agreement you may only use the firmware as physically installed in the instrument Archival cop...

Страница 4: ...ect of the declaration described above is in conformity with the relevant Union harmonization legislation 2014 53 EU Radio Equipment Directive References to the relevant harmonized standards used to t...

Страница 5: ...re should be no degradation in EMC performance Exposure to RF interference greater than that found in a typical laboratory environment may disturb the sensitive measurement circuitry of the instrument...

Страница 6: ...ter contains the following certification numbers FCC ID TFB TIWI 01 IC 5969A TIWI101 This device is granted for use in mobile only configurations in which the antennas used for this transmitter must b...

Страница 7: ...r 13 3 3 Display Overview 13 3 3 1 Home Screen 13 3 4 Basic Operation 14 3 4 1 Measurement Modes 14 3 4 2 Averaging Window 16 3 4 3 Autorange and Range Selection 17 3 4 4 Field 18 3 4 5 Frequency AC m...

Страница 8: ...66 4 5 Command Summary 67 4 5 1 Common Commands 67 4 5 2 SCPI Subsystem Commands 70 Chapter 5 Probes and Accessories 5 1 General 77 5 2 Models 77 5 3 Accessories 77 5 4 Rack Mounting 78 5 4 1 Full Ra...

Страница 9: ...F41 teslameters include D DC and RMS measurement D Peak to peak measurement D Autoranging D Variable averaging window D Min Max hold D Relative readings D Temperature compensation D Frequency measurem...

Страница 10: ...and industry standard SCPI commands D USB computer interface provides direct serial communication by emulating a standard RS 232 connection D Ethernet allows full control and reporting throughout an I...

Страница 11: ...ters f71 and f41 teslameters Feature Description Power requirement 100 V to 240 V universal input 50 Hz to 60 Hz 30 VA Size 216 mm wide 87 mm high 369 mm deep 8 5 in 3 4 in 14 5 in half rack Weight 3...

Страница 12: ...g plug of the power cable meet Underwriters Laboratories UL and International Electrotechnical Commission IEC safety standards Ventilation The instrument has ventilation holes in its side covers Do no...

Страница 13: ...e insulation or reinforces insulation equivalent to Class II of IEC 536 see Annex H CAUTION High voltages danger of electric shock background color yellow symbol and outline black CAUTION or WARNING S...

Страница 14: ...6 cHAPTER 1 Introduction F71 F41 Teslameter...

Страница 15: ...ed shipping materials and contents until instructed to either return or discard them Open the shipping container and keep the container and shipping materials until all contents have been accounted fo...

Страница 16: ...e screen and operating the touch interface comfortable from any angle even when mounted in a rack The screen adjusts from a 0 to a 47 viewing angle whether mounted in a rack or on a bench top FIGURE 2...

Страница 17: ...ommunications inter face The USB interface is provided to connect with most modern com puters 5 RJ 45 Ethernet interface The Ethernet interface is provided to allow connection to a com puter network 6...

Страница 18: ...are adding the option card yourself 2 4 2 Line Input Assembly This section describes how to properly connect the F71 F41 teslameter to line power Please follow these instructions carefully to ensure p...

Страница 19: ...cted the instrument reads parameters from probe memory and the probe is ready to use A new probe can be connected at any time even while the instrument is turned on 2 4 4 1 Probe Handling To avoid dam...

Страница 20: ...set ting can be configured through the front panel or through the remote interfaces Connect an oscilloscope or data acquisition system to the output BNC to analyze the readings The shell of the analog...

Страница 21: ...turning back on 3 3 Display Overview This section describes the various displays of your teslameter 3 3 1 Home Screen When the teslameter is turned on the Home screen is displayed The screens you see...

Страница 22: ...DC measurement mode the display shows the measured DC field the DC max hold and the DC relative mea surement 3 4 1 2 AC Measurement Mode AC mode offers the highest level of accuracy for periodic field...

Страница 23: ...ed data For example In AC mode a 1 Hz signal requires a 10 s averaging window for accurate measure ment In some applications this may be too slow Instead DC mode with an averaging window of 10 ms will...

Страница 24: ...rate D Adjusting the accuracy of the AC and DC components of a measurement in AC mode section 3 4 1 2 D Setting the measurement buffer interval when using the streaming data buffer feature over SCPI s...

Страница 25: ...t 3 4 3 Autorange and Range Selection The F71 F41 teslameter is equipped with an autoranging feature that will automati cally select the appropriate range for the measured field In some cases it may b...

Страница 26: ...defined as the square root of the sum of the squares of the three axes measurements This is also known as the vector sum The figure below shows an example of the display in AC mode 3 4 5 Frequency AC...

Страница 27: ...o the RMS reading in the AC and high frequency modes The relative measurement does not interact with other features at this time Touch the Tare button on the screen to capture the present reading and...

Страница 28: ...ore information on temperature compensation see section 3 5 6 3 4 9 Screen Lock The screen lock feature prevents accidental changes to parameter values When the screen is locked some parameter values...

Страница 29: ...probe assigned during manufacturing Probe type Construction Information about the mechanical design of the probe Sensor type Family Variant The material family of the sensor Sensor orientation The di...

Страница 30: ...eld control settings can be accessed through the Settings menu top left corner of the screen 3 5 2 1 Power Supply Protection Magnet power supplies can be damaged by a control voltage that is too large...

Страница 31: ...t will be used even when a step change is requested including when disabling field control while actively controlling 3 5 2 2 Open Loop Mode In Open Loop mode the control output voltage of the field c...

Страница 32: ...oportional setting is part of the overall control loop gain and so are the magnet magnet gap and power supply characteristics The pro portional setting will need to change if the hardware changes 3 5...

Страница 33: ...ting that is too low causes the field to take too long to reach the setpoint An integral setting that is too high can create overshoot which cannot be tolerated in many magnetic systems An integral se...

Страница 34: ...disables ramping Changes to the setpoint will behave like step changes Tap Field on the Home screen to go to the detail screen where the PI values and set point can be configured While the ramp rate...

Страница 35: ...wnloads fast magnetic field mapping with f series teslameters pdf sfvrsn 6284a805_6 3 5 4 Analog Output The analog output can provide voltage proportional to D The raw amplified Hall voltage D The cor...

Страница 36: ...C or AC modes will result in a modulated signal that won t be useful Due to the raw nature of this signal the voltage level will not predictably relate to the actual applied field The best method for...

Страница 37: ...irectly interface with a wide range of sys tems The pin assignments can be found in the table below Each input and output can be configured to provide a different function The available functions are...

Страница 38: ...n 4 5 2 or through the Digital I O menu option in the Settings menu The available functions are D None the state of the input does not affect the state of the instrument The state of the inputs is syn...

Страница 39: ...most recent value 3 5 5 3 Outputs The DIGital OUTput FUNCtion command is used to configure a specific out put relay or through the Digital I O menu option in the Settings menu The DIGital OSETting co...

Страница 40: ...ilable when using non standard probes that do not contain a temperature sensor or when operating at a temperature beyond the range of the temperature sensor In the Temperature tab change the compensa...

Страница 41: ...ogenic operation The feature can be disabled on the Measurement Setup screen The sensitivity of the sensor changes slightly with temperature Use manual tem perature compensation section 3 5 6 when ope...

Страница 42: ...System settings About tab Field Description Model number This field displays the model number Product name This field will always display Teslameter Serial number The unique identifier for this speci...

Страница 43: ...mize the life of the display The half life of the display is rated with a typical value of 30 000 hours In addition to help further maximize the life of the dis play the teslameter implements an auto...

Страница 44: ...cations to which the F71 F41 teslameter adheres In addition the attribution notices for the open source software used in the teslameter are listed here 3 5 9 5 Update See section 3 5 11 for informatio...

Страница 45: ...nonvolatile memory and can be cleared without affecting instrument calibration 3 5 10 1 Default Settings Settings are not stored in non volatile memory Therefore the table below can be considered a l...

Страница 46: ...is called the local repository This allows you to downgrade firmware should you choose since older versions will still remain on the teslameter in the local repository In addition Lake Shore maintain...

Страница 47: ...eslameters f71 and f41 teslameters to download the firmware 2 Enter your name and e mail address so that we can keep you updated on any new firmware for your instrument 3 Insert the USB stick into you...

Страница 48: ...nder the influence of an external driving electric field When exposed to a magnetic field these moving charged particles experience a force perpendicular to both the velocity and magnetic field vector...

Страница 49: ...itioned to measure fields running perpendicularly through the probe stem This is most useful for measuring fields inside magnet gaps These probes are easily identified by their flattened rectangular s...

Страница 50: ...of the standard probe is removed exposing the PCB and sensor element This results in a somewhat flexible stem that is also thinner than the standard stem type making it the best probe for measuring i...

Страница 51: ...single and multi axis probes This connector also includes an EEPROM that contains probe calibration data allowing the probe to be recognized by the teslameter after being connected 3 6 3 Installation...

Страница 52: ...on are not required the holes can be used in lieu of the locating pins These through holes are sized for M2 fasteners with socket heads Fasteners with larger heads may not fit into the recess provided...

Страница 53: ...connection This will result in a probe read error Unplug the probe from the teslameter and try the connection again If the problem persists please contact Lake Shore Service As soon as the probe suc...

Страница 54: ...ated On the oppo site side of the probe a target indicator is painted on the PCB to show the active area when the sensor is facing away from the operator The active area of the sensing element is on t...

Страница 55: ...of the probe will determine whether readings are positive or negative 3 6 4 2 1 Transverse Polarity can easily be confused on transverse probes as twisting the probe 180 will result in a reversed pol...

Страница 56: ...this situation the handle will be less useful that look ing directly at the stem tip where active area location and axis labels are laser engraved D X axis positive field reading when field passes thr...

Страница 57: ...ng test and measurement instru ments SCPI provides instrument control with a standardized command syntax and style The following sections provide a brief overview of the SCPI language syntax and behav...

Страница 58: ...er is enclosed in brackets then it is optional Do not include the brackets if you send the optional command to the instrument For example the fol lowing command messages are both valid FETCh FIELd DC...

Страница 59: ...The instrument also allows an optional carriage return hex 0D decimal 13 to precede the line feed 4 2 8 Message Flow Control It is important to remember that the user program is in charge of SCPI comm...

Страница 60: ...E DSE QYE OPC 7 6 5 4 3 2 1 0 Not used Not used OSB ESB MSS MAV QSB EAV 7 6 5 4 3 2 1 0 Not used Not used OSB ESB MSS MAV QSB EAV 7 6 5 4 3 2 1 0 15 14 13 12 11 10 9 8 Not used Not used Not used Not u...

Страница 61: ...is ter determines which bits in the corresponding event register will set the summary bit for the register set in the status byte The user may write to or read from an enable register Each event regis...

Страница 62: ...t Service RQS bit In this case when the RQS MSS bit would be set the service request hardware line would go high indicating to the controller on the bus to query the status byte Since the F71 F41 tesl...

Страница 63: ...the instrument could not interpret the command due to a syntax error an unrecognized header unrecognized termina tors or an unsupported command D Execution Error EXE Bit 4 this bit is set if an execu...

Страница 64: ...pper limit of the present range setting D Probe Not Connected NOPR Bit 0 indicates that there is not a probe connected to the instrument FIGURE 4 3 Standard event status register FIGURE 4 4 Operation...

Страница 65: ...indicates that the connected probe has built in temperature compensation but the instrument cannot read the tem perature sensor D EEPROM Read Error EER Bit 3 indicates that the instrument is unable t...

Страница 66: ...iod of time issuing the SYSTem ERRor NEXT query will return the message that was added to the queue first and subsequently remove it from the queue For further details on these error query commands se...

Страница 67: ...le to be used to connect the teslameter to a host PC The pin assignments for A type and B type connectors are shown in section 6 7 The maximum length of a USB cable as defined by the USB 2 0 standard...

Страница 68: ...ws Download the driver 1 Locate the USB driver on https www lakeshore com software 2 Right click on the USB driver download link and select Save as 3 Save the driver to a convenient place and take not...

Страница 69: ...ws has successfully updated your driver software should appear Click Close to com plete the installation 4 4 2 Ethernet and Wi Fi The Ethernet and Wi Fi interfaces provides a means of connecting the F...

Страница 70: ...g selection of either DHCP or static IP 1 Enter the network password then navigate to the upper right part of the screen and tap Connect 2 To connect to a network that is not displaying its SSID the n...

Страница 71: ...ength Network prefix is an alternative way to present the subnet mask For example a network prefix length of 16 translates to a subnet mask of 255 255 0 0 while prefix length of 8 translates to a subn...

Страница 72: ...mber from 0 to 255 D Subnet Mask a sub network or subnet is a group of devices within a network that have a common designated IP address routing prefix A subnet mask is a 32 bit bit mask that signifie...

Страница 73: ...sibility of being automatically reconfigured when the DHCP lease expires Contact your net work administrator to find out the DHCP lease policy on your network Static IP Static IP is a method of manual...

Страница 74: ...t number used for TCP socket connections on the teslameter is 7777 by default The port number can be configured from the Connectivity screen in System settings top left corner of the screen 4 4 3 SCPI...

Страница 75: ...0 255 Example ESE 32 Remarks Sets the standard event status enable register bits The parameter when rounded to an integer value and expressed in base 2 represents the bit values of the standard event...

Страница 76: ...PC Query Format OPC Remarks Places an ASCII character 1 into the device s output queue when all pending selected device operations have been finished This query allows synchronization between a contro...

Страница 77: ...When converted to binary the response rep resents the current bit values of the standard request enable register Bit 6 will always be zero STB Query Format STB Remarks Returns the status byte and mas...

Страница 78: ...10ms sam ples Configures the length of the averaging window Command Parameter s Description SYSTem AUTODATETIME Returns whether the instru ment automatically sets the date and time when con nected to...

Страница 79: ...the RMS measurement of the total magnitude a spe cific axis or all axes Not avail able in DC mode FETCh FREQuency Returns the dominant fre quency Not available in DC mode FETCh PEAK MAGNitude X Y Z AL...

Страница 80: ...line field value Configures the baseline field value SENSe MRESet Resets the max and min hold values to the pres ent reading SENSe AVERage COUNt Returns the number of 10 ms samples in the averaging wi...

Страница 81: ...agnitude Command Parameter s Description DIGital IDATa Returns the integer representation of the input states DIGital INPut FUNCtion Returns the present function for input DIGital INPut FUNCtion NONE...

Страница 82: ...nsor orientation PROBe TCOMpensation Returns whether the probe is temperature compensated PROBe AXES Returns the probe number of axes PROBe CALDate Returns the calibration date Command Parameter s Des...

Страница 83: ...age output SOURce FIELd OPLoop VOLTage Returns the open loop voltage output setting SOURce FIELd OPLoop VOLTage voltages Sets the open loop voltage out put setting SOURce FIELd CLLoop SETPoint Returns...

Страница 84: ...76 cHAPTER 4 Computer Interface Operation F71 F41 Teslameter...

Страница 85: ...Please see https www lakeshore com products categories overview magnetic products hall probes fp series hall probes 5 3 Accessories Accessories are devices that perform a secondary duty as an aid or...

Страница 86: ...tails FIGURE 5 1 Full rack mounting Standard 19 in 483 mm rack width Item Description Qty 1 Full rack mount tray 1 2 Screw M4 5 mm FHM Phillips 4 3 Washer 1 6 to 1 8 mm THK 2 If a non XIP full rack in...

Страница 87: ...plied spacers to allow screen to tilt freely A third party shelf may be used though more space may be required above instrument Additional screws are included for use with other Lake Shore or third pa...

Страница 88: ...80 cHAPTER 5 Probes and Accessories F71 F41 Teslameter...

Страница 89: ...the USB driver is installed properly and that the device is functioning In Microsoft Windows the device status can be checked using Device Manager by right clicking Lake Shore Instrument under Ports...

Страница 90: ...breaks the conducting path Temperature compensation rail Thecurrentdoesnothaveapaththroughthetemperaturesensor Theprobe may have a mechanical fault that breaks the conducting path Measurement message...

Страница 91: ...Description 1 Ground 7 Ground 2 Power 8 Power 3 Input 2 low 9 Relay 2 low 4 Input 2 high 10 Relay 2 high 5 Input 1 low 11 Relay 1 low 6 Input 1 high 12 Relay 1 high TABLE 6 2 Digital I O pinouts FIGU...

Страница 92: ...r from switch not used 5 EPWR Power from switch not used 6 RXD Receive data 7 EPWR Power from switch not used 8 EPWR Power from switch not used TABLE 6 4 Ethernet pin and connector details FIGURE 6 4...

Страница 93: ...ve B7 Dn2 Non SuperSpeed differential pair position 2 negative A7 Dn1 Non SuperSpeed differential pair position 1 negative B6 Dp2 Non SuperSpeed differential pair position 2 positive A8 SBU1 Sideband...

Страница 94: ...X4 13 Shield 22 Temperature voltage 5 Y1 14 Adapter Detect 23 EEPROM Power 6 Y3 15 Connector Detect2 24 Temperature voltage 7 Y2 16 Ground 25 Connector Detect 8 Y4 17 EEPROM Data 26 Ground 9 Z1 18 Tem...

Страница 95: ...to store boot loader firmware The memory is programmed at Lake Shore 6 The Cypress FM24V10 is a 128 KB I2C F RAM It is used on the field control option card to store the serial number and calibration...

Страница 96: ...any shipping carton s in which equipment is originally received in the event that any equipment needs to be returned If original packaging is not available a minimum of 76 2 mm 3 in of shock absorbent...

Страница 97: ...n 30 days after the RMA is issued The RMA will be cancelled if we do not receive the equipment after 60 days 6 9 4 Shipping Charges All shipments to Lake Shore are to be made prepaid by the customer E...

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