HALLCAL.EXE program instructions
Contents
1. Lake Shore CRYO TRONICS Instructions Gaussmeter Cable and HALLCAL EXE CAUTION This Hall sensor is sensitive to electrostatic discharge ESD Use ESD precautionary procedures when handling or making mechanical or electrical connections to this device in order to AA avoid performance degradation or loss of functionality 1 0 GENERAL This document provides operation instructions for operating a Hall sensor with a Lake Shore 420 421 450 or 460 gaussmeter Using a Hall sensor with a Lake Shore gaussmeter is described in Paragraph 1 1 MCBL 6 and MCBL 20 programmable cables details are provided in Paragraph 1 2 Finally setup and operation of the Hallcal exe software is described in Paragraph 1 3 Instructions in this chapter are intended for the low impedance bulk Hall sensors The instructions do not apply to HGT 2100 HGT 2010 and HGA 2010 which are intended for use with the Model 410 gaussmeter The impedance and control current requirements of these three Hall sensors are not compatible with the Lake Shore gaussmeters that use the MCBL cables 1 1 USING A HALL SENSOR WITH A LAKE SHORE GAUSSMETER To hook up a Hall sensor you must use a Lake Shore MCBL 6 or MCBL 20 cable assembly Paragraph 1 2 The MCBL 6 cable is 2 m 6 5 ft long with a DA 15 connector on one end and four leads on the other The MCBL 20 cable is 6 m 20 ft long The Hall sensor is a 4 lead device The 4 leads are labeled lc Red Ic Black o2. Shore nor anyone else involved in the creation or production of this software can pay for loss of time inconvenience loss of use of the product or property damage caused by this product or its failure to work or any other incidental or consequential damages Use of our product implies that you understand the Lake Shore license agreement and statement of limited warranty Form Number F048 00 00 Revision D 2014 Lake Shore Cryotronics Inc 1 May 2014
3. lly with no lead resistance See Figure 1 1 The gaussmeter needs input sensitivity between 0 5 to 1 5 mV kG HST or 5 0 and 15 mV kG HSE at its input Reable Reust ja B pen Circuit Sensitivity Gaussmeter Ve Input Rcable Roust Sensitivity at Gaussmeter input is i Ry Reable Lake Shore Model Rcust Customer reduced by the lead input voltage divider MCBL Cable Assembly Supplied Leads Impedance2 cvx Figure 1 1 Typical Hall Sensor Input Impedance Lake Shore Cryotronics 575 McCorkle Blvd Westerville OH 43082 www lakeshore com Phone 614 891 2243 Fax 614 891 1362 sales lakeshore com service lakeshore com 1 2 MCBL 6 AND MCBL 20 ROGRAMMABLE CABLES MCBL 6 and MCBL 20 have 15 pin D Style connectors on one end for attachment to the PROBE INPUT connecior on the back panel of a Lake Shore gaussmeter Four tinned wires are provided for connection to the Hall sensor The leads may be soldered directly to these wires See Figure 1 2 CAUTION Care must be exercised when handling the Hall sensor The Hall sensor is very fragile Stressing the Hall sensor can alter its output Any excess force can easily break the Hall sensor Broken Hall sensors are not repairable CAUTION The Hall sensor should be isolated from all line voltages or voltages referenced to earth ground If not damage to the gaussmeter is almost a certainty CAUTION The probe must be connected to the rear of the instrument before applying power to
4. r Green VH Blue and VH Yellow corresponding to the 4 leads on all the Hall sensors The typical Lake Shore 421 450 or 460 gaussmeter has an input impedance of 420 Q Therefore the actual sensitivity at the gaussmeter input will be less than the value given with the Hall sensor due to drop in the leads and cable This fact is important because a sensitivity value is supposed to be loaded into the cable PROM to set calibration We recommend that the customer always check accuracy against a reference field rather than use the sensitivity value sent with the bare Hall generator Because Lake Shore has no control of the conditions beyond the cable the customer must accept responsibility for accuracy and compatibility Finally Manganin wire is not usually acceptable for gaussmeter connections The resistance of Manganin wire is often too high Hall generators are normally connected using twisted pairs of copper wire such as 34 gauge Teflon insulated There are two reasons for this 1 The gaussmeter current source is limited in compliance voltage The gaussmeter should not drive a load Hall sensor wires in cryostat and probe cable greater than 50 Q In fact for best performance the load should be less than 30 Q 2 Because the typical Lake Shore gaussmeter input impedance is 420 Q there is a voltage drop due to lead resistance in series with the gaussmeter input The Lake Shore Hall sensor sensitivity given on the data sheet is basica
5. rial number of the Hall sensor 1 3 2 Program Setup and Operation 1 Set the Lake Shore gaussmeter to 300 baud Refer to your User s Manual on how to set the gaussmeter to communicate at 300 baud 2 Insert the disk into the computer and type in the default drive A or B 3 Either double click on Hallcal exe or enter the command HALLCAL from the program line This will execute the Hallcal exe program 4 The program will prompt for the Probe serial number Any combination of 6 letters or number can be entered Press Enter when this is accomplished 5 The program will prompt for the probe type 0 or 1 Enter 0 for Hall sensors with sensitivities between 5 5 and 10 5 mV kG at 100 mA current Enter 1 for Hall sensors with sensitivities between 0 55 and 1 05 mV kG at 100 mA current 6 The program will prompt for the Calibration Constant Enter the magnetic sensitivity in mV kG at a control current of 100 mA Remember to account for the 420 Q input impedance of the gaussmeter when calculating the proper load resistor to install 7 The program will display all the values entered along with designated F keys F1 Probe Serial Number ABC123 F2 Probe Type 0 F3 Calibration Constant X XXX F10 Program Probe Esc Exit Program 8 Atthis time if any of the parameters need to be changed just press the appropriate F key and type in the new value When everything appears correct press F10 to program the probe 9 I
6. the gaussmeter Probe memory may be erased if connected with power on The DA 15 connector is detailed in Figure 1 3 Once connections are made refer to Paragraph 1 3 for instructions on using the Hallcall exe program to store probe parameters in the internal EPROM Green Wire Current to SENER Red Wire Blue Wire 6 Foot or 20 Foot Hall Voltage Cable to Gaussmeter from Sensor f Yellow Wire MCBL6 eps Figure 1 2 Model MCBL 6 and MCBL 20 Programmable Cables DA 15 Connector Connector eps Pin Description Pin_ Deseription INPUT INPUT NC NC NC GND 1 ITEMP Vcc ITEMP A D CLK NC EE DATA NC lc lc 1 2 3 4 5 6 7 8 Figure 1 3 DA 15 Connector Details Form Number F048 00 00 Revision D 2014 Lake Shore Cryotronics Inc 1 May 2014 1 3 HALLCAL EXE The Hallcal exe program was developed by Lake Shore to allow the interfacing of a customer attached Hall sensor to a Lake Shore gaussmeter Because of the many intricacies involved with proper calibration the Customer must accept responsibility for the measurement accuracy 1 3 1 Requirements Lake Shore gaussmeter connected via RS 232 to the computer in the COM1 port NOTE Computer interface cable must be a NULL MODEM type e Lake Shore MCBL 6 or MCBL 20 cable assembly IBM or compatible computer Hall sensor meeting the sensitivity ranges given below e Calibration or sensitivity constant and se
7. ttakes about 20 s to program the probe After the probe is programmed press the Esc key to exit the program SOFTWARE LICENSE AGREEMENT This software is protected by United States copyright law and international treaty provisions Lake Shore provides this software package and grants you the user of the software a non exclusive and non transferable right to use this software Unless as provided in this Agreement any attempt to sublicense lease rent assign or transfer this license or this software is void To maintain software warranty the source code must not be modified Any changes made to the HALLCAL EXE source code are at the user s risk Lake Shore will assume no responsibility for damage or errors incurred as result of any changes made to the source code Under the terms of this agreement you may use the HALLCAL EXE software on any one computer system One archival disk is permitted Any unauthorized duplication or use of the software in whole or in part in print or in any other storage and retrieval system is forbidden Lake Shore has worked to ensure that the HALLCAL EXE software is as free of errors as possible and that the results you obtain from the system are accurate and reliable However understand that with any computer software the possibility of software exists In any important research as when using any laboratory equipment results should be carefully examined and rechecked before final conclusions are drawn Neither Lake
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