Model 425 Datasheet
Contents
1. O o o IE N S z S S FiBL od 5 E DU EOU AA KAT Na ie akeShore Introduction Designed to meet the demanding needs of the permanent magnet industry the Lake Shore Model 425 gaussmeter provides high end functionality and performance in an affordable desktop instrument Magnet testing and sorting have never been easier When used in combination with the built in relay and audible alarm features the Model 425 takes the guesswork out of pass fail criteria Additional features including DC to 10 kHz AC frequency response max hold and relative measurement make the Model 425 the ideal tool for your manufacturing quality control and R amp D flux density measurement applications For added functionality and value the Model 425 also includes a standard Lake Shore Hall probe Put the Model 425 gaussmeter to use with confidence knowing it s supported by the industry leading experts in magnet measurement instrument sensor and Hall probe technology 2 Model 425 Gaussmeter Throughput Throughput involves much more than just the update rate of an instrument An intuitive menu navigation and keypad along with overall ease of use are equally important The Model 425 is designed with these qualities in mind The operation is straightforward with user display prompts to aid set up We understand that time is money In addition to being user friendly the automated m2. performance www lakeshore com Lake Shore Cryotronics Inc 614 891 2244 fax 614 818 1600 e mail info lakeshore com Measurement Features The Model 425 offers a variety of features to enhance the usability and convenience of the gaussmeter Autorange In addition to manual range selection the instrument automatically chooses an appropriate range for the measured field Autorange works in DC and AC measurement modes Probe zero Allows you to zero all ranges while in DC mode with the simple push of a key Display units Field magnitude can be displayed in units of G T Oe and A m with resistance in Q Max hold The instrument stores and displays the captured maximum DC or AC field reading Relative reading The relative mode calculates the difference between a live reading and the relative setpoint to highlight deviation from a known field point This feature can be usedin DC or AC measurement modes Instrument calibration Lake Shore recommends an annual recalibration schedule for all precision gaussmeters Recalibrations are always available from Lake Shore but the Model 425 allows you to field calibrate the instrument if necessary Recalibration requires a computer interface and precision low resistance standards of known value Instrument Probe Features The Model 425 offers the best measurement performance when used along with Lake Shore Hall probes Firmware based features work in tandem with
3. 2 8888 USA Tel 614 891 2244 Fax 614 818 1600 e mail info lakeshore com www lakeshore com Established in 1968 Lake Shore Cryotronics Inc is an international leader in developing innovative measurement and control solutions Founded by Dr John M Swartz a former professor of electrical engineering at the Ohio State University and his brother David Lake Shore produces equipment for the measurement of cryogenic temperatures magnetic fields and the characterization of the physical properties of materialsintemperature and magnetic environments
4. 350 kG 000 01 kG 000 1 kG 35 kG 00 001 kG 00 01 kG 0 0001 kG 0 001 kG 000 02 G 000 1 G HSE probe 35 kG 3 5 kG 350 G 35 G UHS probe 35 G 39G 350 mG 00 001 kG 0 0001 kG 000 01 G 00 001 G 00 01 kG 0 001 kG 00 01 G O maa ep 00 001 G 0 0001 G 000 02 mG 00 01 G 000 1 mG O O ep Measurement resolution RMS noise floor Indicated by value in above table for shorted input Display resolution Indicated by number of digits in above table DC accuracy 0 20 of reading 0 05 of range DC temperature coefficient 0 01 of reading 0 003 of range C DC filter 16 point moving average Accelerate through testing and sorting AC measurement Probe type Ranges 3 digit resolution HST probe 000 1 kG 350 kG 35 KG 00 01 kG 0 001 kG 000 1 G HSE probe 35 kG 00 01 kG 3 5 kG 0 001 kG 350 G 000 1 G 35 G 00 01 G UHS probe 395 G 00 01 G 39G 0 001 G 350 mG 000 1 mG Measurement resolution RMS noise floor Indicated by value in above table measured at mid scale range Display resolution Indicated by number of digits in above table Wide band mode 2 of reading 0 05 of range 50 Hz to 10 kHz 50 Hz to 10 kHz gt 1 of range except gt 2 of range on lowest range Narrow band mode 2 of reading 0 05 of range 20 Hz to 100 Hz 2 5 of reading 0 05 of range 10 Hz to 400 H
5. G C 0 00596 C Fiberglass DC to 35 kG 30 to 35 kG epoxy 800 Hz 0 04 C 0 040 dia approx a cable length olx 64 mm 2 5 in _______ 76 13 3 mm 3 0 5 0 125 in a 2 m 6 5 ft 3 18 mm diameter max 9 53 mm B kom t 0 125 in 0 375 in i el A er L 9 1 40 76 mm diameter 0 36 0 030 in el la Active area Stem Frequency Usable full scale Corrected accuracy Operating Temp Temp coefficient in material range ranges rdg temp coefficient max calibration range max zero HSE DC to 0 20 to 30 kG HMFT 3E03 VR 35 G 350 G 3 5 kG 5 0 09 G C 0 0496 C 0 135 0 025 0 125 0 040 dia Flexible 10 kHz 25 KG 0 25 30 to 35 kG 0 Cto j max max 0 005 approx lastic tubin 75 C HMFT 3E03 VF mm DGto isla AN 0 136 C 0 005 C 800Hz 350G 3 5kG 35kG 0 15 30 to 35 kG HG www lakeshore com Lake Shore Cryotronics Inc 614 891 2244 fax 614 818 1600 e mail info lakeshore com Model 425 Specifications Does not include probe error unless otherwise specified General measurement Input type Single Hall effect sensor Maximum update rate 30 rdg s Probe features Linearity compensation probe zero and hot swap Measurement features Autorange max hold relative mode and filter Probe connector 15 pin D sub socket DC measurement Probe type Filter on Filter off Ranges 4 digit resolution 3 digit resolution HST probe
6. XXX XX see list on page 5 Please indicate your power cord configuration 100 VAC U S power cord 120 VAC U S power cord 220 VAC European power cord 240 VAC European power cord Accessories included G 106 253 VO mating connector G 106 264 VO mating connector shell 4060 Zero gauss chamber MAN 425 Model 425 user manual Accessories available 4065 Large zero gauss chamber for gamma probe HMCBL 6 User programmable cable with EEPROM 6 ft HMCBL 20 User programmable cable with EEPROM 20 ft HMPEC 10 U Probe extension cable with EEPROM 10 ft uncalibrated HMPEC 25 U Probe extension cable with EEPROM 25 ft uncalibrated HMPEC 50 U Probe extension cable with EEPROM 50 ft uncalibrated HMPEC 100 U Probe extension cable with EEPROM 100 ft uncalibrated RM 72 Rack mount kit for one Ve rack gaussmeter in 483 mm 19 in rack RM 2 Rack mount kit for two Vo rack gaussmeter in 483 mm 19 in rack Calibration service CAL N7 DATA New instrument calibration for Model 425 455 475 with certificate and data CAL 425 CERT Instrument recalibration with certificate CAL 425 DATA Instrument recalibration with certificate and data One probe included additional probes ordered separately Custom probes available consult Lake Shore 7 nn www lakeshore com Lake Shore Cryotronics Inc 614 891 2244 fax 614 818 1600 e mail info lakeshore com LakeShore Lake Shore Cryotronics Inc 575 McCorkle Boulevard Westerville OH 4308
7. a in material range ranges accuracy temp coefficient coefficient rdg range C max zero max calibration Ka 0 005 Fiberglass kaaa 0129 0 187 da 0 005 0093 Ib kitz 35 NGA G eae 0 09G C 0 04 C NUSA 2 0 063 0 25 dia 0 006 DID ae 3 5 KG 35 kG 30 to 35 kG PSR 440 125 0 187 di 0005 approx Fberglass DC to o 1904 0 187 dia 0 005 nong approx enox 800 Hz HST 4 0 10 to30 tC Dae baa 3506 3 5kG KG and 0 15 0 13G C 0 005 C TEST 20063 0 25 dia 0 006 DOT Aluminum 400 Ho 35 kG 30 to 35 kG Transverse probes cable length _ _ _ 64 mm 2 5 in la i i Al LA t T T E 4 A mi es Lei 0 76 mm diameter Li a 0 36 20 030 in L in T in W in A in Active area Stem Frequency Usable full scale Corrected Operating Temp Temp coefficient in material range ranges accuracy temp coefficient max calibration rdg range max zero 0 061 0 180 DC to HMMT 6J04 VR 4 40 125 max 0 005 0 045 0 150 HMNT 4E04 VR 4 0 125 0 005 0 150 0 061 0 180 0 050 HMMT 6J04 VF 4 0 125 0 005 0 045 0 150 HMNT 4E04 VF 4 0 125 max 0 005 Flexible transverse probes Aluminum HSE 0 20 to 800 Hz 35 G 350 G 30 KG 0 25 0 09 G C Fiberglass DC to 3 5 kG 35 kG 30 to 35 kG epoxy 10 kHz DC to A00 Hz HST 4 0 10 to 350G 3 5kG 30 kG 0 15 0 13
8. agnet testing and sorting features of the Model 425 streamline sorting and testing operations In addition hot swapping of Hall probes allows you to switch probe types without powering the instrument off and back on These features support increased productivity allowing you to spend less time setting up your instrument and more time working on the task at hand DC measurement mode Static or slowly changing fields are measured in DC mode In this mode the Model 425 uses probe field compensation to correct for probe nonlinearities resulting in a DC accuracy to 0 20 Measurement resolution is enhanced with internal filtering allowing resolution to 434 digits with reading rates to 30 readings per second over the USB interface M Field ranges from 350 mG to 350 kG B DC measurement resolution to 43 4 digits 1 part of 435 000 Basic DC accuracy of 0 20 DC to 10 kHz AC frequency USB interface Large liquid crystal display Sort function displays pass fail message M Alarm with relay M Standard probe included M Standard and custom probes available AC measurement mode In addition to the DC measurement mode the Model 425 offers an AC measurement mode for measuring periodic AC fields The instrument provides an overall frequency range of 10 Hz to 10 kHz and is equipped with both narrow and wide band frequency modes While in narrow band mode frequencies above 400 Hz are filtered out for improved measurement
9. all effect generator when a suitable probe is not available You can program the nominal sensitivity and serial number into an optional HMCBL blank connector to provide all gaussmeter functions except field compensation If no sensitivity information is available the Model 425 reverts to resistance measurement The Model 425 is only half the magnetic measurement equation For the complete solution Lake Shore offers a full complement of standard and custom Hall effect probes in a variety of sizes and sensitivities One of ten standard Hall probes is included with the Model 425 See page 5 for details on the Hall probes you can choose to receive with the Model 425 www lakeshore com Lake Shore Cryotronics Inc 614 891 2244 fax 614 818 1600 e mail info lakeshore com Display and Interface Features The Model 425 has a 2 line by 20 character liquid crystal display During normal operation the display is used to report field readings and give results of other features such as max or relative When setting the instrument parameters the display gives you meaningful prompts and feedback to simplify operation Following are four examples of the various display configurations Normal reading the default mode with the display of the live DC field reading Max DC hold on the maximum value is shown in the lower display while the upper display contains the live DC field reading Alarm on the alarm giv
10. an oscilloscope or data acquisition system Computer interface The Model 425 is equipped with a universal serial bus USB interface It emulates an RS 232C serial port at a fixed baud rate of 57 600 but with the physical connections of a USB In addition to gathering data nearly every function of the instrument can be controlled through the USB interface The reading rate over the interface is nominally 30 readings per second A LabVIEW driver is available from the downloads section of the Lake Shore website at www lakeshore com A WARNING Shock hazard Ho user servicable parts i Ret Sed kal to trained service personnel PROBE INPUT ad gt www lakeshore com Lake Shore Cryotronics Inc 614 891 2244 fax 614 818 1600 e mail info lakeshore com Hall Probe Selection Listed below are the probes that you can choose from to include with your Model 425 Our experts can guide you through the probe selection process Other standard probes are available at an additional cost Lake Shore prides itself on making every attempt to satisfy customer requests for special probes If you need a custom probe contact Lake Shore for availability Axial probes cable length 64 mm 2 5 in 2 m 6 5 ft i t i f Fr pas 9 1 0 76 mm diamdter 0 36 0 030 in L in D in A in Active Stem Frequency Usable full scale Corrected Operating Temp Temp are
11. es an audible and visual indication of when the field value is selectively outside or inside a user specified range The relay can be associated with the alarm Sort on the live reading is shown in the upper display while the lower display contains the pass fail repetitive sorting or testing message The relay facilitates pass fail operation Line input assembly USB interface Auxiliary VO Probe input 4 Keypad The instrument keypad has 14 keys with individual keys assigned to frequently used features Menus are reserved for less frequently used setup operations The keypad can be locked out to prevent unintended changes of instrument setup Alarm relay and sort High and low alarm functions and one relay are included with the instrument and can be used to automate repetitive magnet testing and sorting operations Alarm actuators include display annunciator audible beeper and a relay The alarm can be configured to display a pass or fail message and the relay can be configured to activate a mechanism to separate parts that meet pre set fail criteria The relay can also be controlled manually for other system needs Monitor output The monitor output provides an analog representation of the reading that is corrected for probe offset and nominal sensitivity This feature makes it possible to view the analog signal which has not been digitally processed The monitor output can be connected to
12. ows alarm or operated manually Connector Shared 25 pin D sub socket Monitor output Configuration Real time analog voltage output proportional to measured field Range 3 5 V Scale 3 5 V full scale on selected range Frequency response DC to 10 kHz Accuracy Offset and single point gain corrected to 0 5 of reading 0 1 of range linearity is probe dependent Minimum load resistance 1 KO short circuit protected Connector Shared 25 pin D sub socket General The Model 425 is the replacement for the Model 421 with a new software command set Ambient temperature 15 C to 35 C at rated accuracy 5 C to 40 C with reduced accuracy Ambient field Up to 100 G DC measured at the instrument chassis Power requirement 100 VAC to 240 VAC 50 Hz to 60 Hz 40 VA Size 216 mm W x 89 mm H x 318 mm D 8 5 in x 3 5 in x 12 5 in half rack Weight 2 1 kg 4 6 Ib Approvals CE mark RoHS compliant Probes and extensions Probe compatibility Full line of standard and custom probes compatible with Model 425 455 475 probes Hall sensor compatibility Front panel programmable sensitivity and serial number for user supplied Hall sensor using HMCBL cable Extension cable compatibility Probe extension cables with an EEPROM are available from 10 ft to 100 ft Ordering Information Part number Description 425 Model 425 gaussmeter 425 HMXX XXXX XX Model 425 gaussmeter with standard probe choice specify selected probe number for HMXX X
13. the probe s calibration and programming to ensure accurate repeatable measurements and ease of setup Many of the features require probe characteristics that are stored in the probe connector s non volatile memory Probe field compensation The Hall effect devices used in gaussmeter probes produce a near linear response in the presence of a magnetic field The small nonlinearities present in each individual device can be measured and subtracted from the field reading Model 425 probes are calibrated in a way to provide the most accurate DC readings Probe information The gaussmeter reads the probe information on power up or any time the probe is changed to allow hot swapping of probes Critical probe information can be viewed on the front panel and read over the computer interface to ensure proper system configuration The probe connection Extension cable The complex nature of Hall effect measurements makes it necessary to match extension cables to the probe when longer cables are needed Keeping probes and their extensions from getting mixed up can become a problem when more than one probe is used The Model 425 alleviates most of the hassle by allowing you to match probes to extension cables in the field Stored information can be viewed on the front panel and read over the computer interface to ensure proper mating Hall effect generators magnetic field sensors The Model 425 will operate with a discrete Lake Shore H
14. z 10 Hz to 400 Hz AC accuracy AC frequency response Minimum input signal gt 1 of range AC specifications based on sine wave inputs or signals with crest factors lt 4 AC temperature coefficient 0 01 of reading 0 006 of range C put with automated N n www lakeshore com Lake Shore Cryotronics Inc 614 891 2244 fax 614 818 1600 e mail info lakeshore com Front panel Display 2 line x 20 character LCD display module with 5 5 mm high characters and LED backlight Display units Gauss G tesla T oersted Oe and ampere per meter A m Display update rate 3 rdg s Display resolution To 4 digits Units multipliers u m k M Display annunciations DC DC measurement mode RMS AC RMS measurement mode MAX Max hold value Alarm on Keypad 14 key membrane Front panel features Display contrast control and keypad lock out Interfaces USB Function Emulates a standard RS 232 serial port Baud rate 57 600 Connector B type USB connector Reading rate To 30 rdg s Software support LabVIEW driver consult Lake Shore for availability Alarm Settings High setpoint low setpoint inside or outside algebraic or magnitude audible on off and sort Actuators Display annunciator sort message beeper and relay Relays Number 1 Contacts Normally open NO normally closed NC and common C Contact rating 30 VDC at 2 A Operation Foll
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