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| hall:start [2020/10/07 17:38] – [Web pages, presentations, etc] janet | hall:start [2021/06/01 11:39] (current) – [Users] janet |
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| {{:hall:Instruction_for_manual_magnetic_power_supply.pdf|Magnet power supply guide}} - Instructions for manual operation of magnet power supply. | {{:hall:Instruction_for_manual_magnetic_power_supply.pdf|Magnet power supply guide}} - Instructions for manual operation of magnet power supply. |
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| {{:Troubleshooting.pdf|Troubleshooting}} - Problems and solutions in the past. | Update user log. |
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| Add reminder to update user log | |
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| After #4/installation, note pressure to at least 10^-4 Torr (should get to 10^-6) depending on last use (15 - 30 mins to 10^-4 Torr and a day or so to 10^-6, depending on previous usage and cleanliness). This is noted under #9/installation, but should be repeated in #4/installation | After #4/installation, note pressure to at least 10^-4 Torr (should get to 10^-6) depending on last use (15 - 30 mins to 10^-4 Torr and a day or so to 10^-6, depending on previous usage and cleanliness). This is noted under #9/installation, but should be repeated in #4/installation |
| |^Name ^PI/group & dept^email^other contact^trained by/date^High-T Hall?| | |^Name ^PI/group & dept^email^other contact^trained by/date^High-T Hall?| |
| |Janet Tate|Tate, Physics |tate@physics.oregonstate.edu|541-7371700 (office)|Janet 1995!|yes| | |Janet Tate|Tate, Physics |tate@physics.oregonstate.edu|541-7371700 (office)|Janet 1995!|yes| |
| |Kelda Diffendaffer|Tate, Physics |diffendk@oregonstate.edu|?|Aaron,Janet 1/2018|yes| | |
| |Acacia Patterson|Tate, Physics |patterac@oregonstate.edu|?|Janet 10/2018|no| | |
| |Jenn Amador|Keszler, Chemistry |amadorj@oregonstate.edu|?|Kelda 7/2018|no| | |Jenn Amador|Keszler, Chemistry |amadorj@oregonstate.edu|?|Kelda 7/2018|no| |
| |Aaron Dethlefs|PMIC |dethleaa@oregonstate.edu|?|Janet 2017|yes| | |Aaron Dethlefs|PMIC |dethleaa@oregonstate.edu|?|Janet 2017|yes| |
| |Linda Engelbrecht|PMIC |lindaengelbrecht@pmiclab.com|?|Janet 2015|yes| | |Linda Engelbrecht|PMIC |lindaengelbrecht@pmiclab.com|?|Janet 2015|yes| |
| |Robert Kokenyesi|Tate/Keszler/Engineering |robert.kokenyesi@oregonstate.edu|?|Janet 2010|yes| | |Robert Kokenyesi|Tate/Keszler/Engineering |robert.kokenyesi@oregonstate.edu|?|Janet 2010|yes| |
| |Bokun Zhou|Wang, EECS |zhoubok@oregonstate.edu|?|Aaron, 2018|no| | |Cheng Zhen|Wang, EECS |zhenc@oregonstate.edu|?|Robert, 2021|no| |
| |Yunfei Bo|Wang, EECS |boyu@oregonstate.edu|?|Acacia, 2019|no| | |
| |Dylan Kearney|Amorphyx|dkearney@amorphyx.com|?|Acacia 6/2019|no| | |Dylan Kearney|Amorphyx|dkearney@amorphyx.com|?|Acacia 6/2019|no| |
| | |Ben Kupp|Conley, EECS |kuppb@oregonstate.edu|?|Robert, 2021|no| |
| | |Former Users|-- |--|--|--|--| |
| | |Kelda Diffendaffer|Tate, Physics |diffendk@oregonstate.edu|?|Aaron,Janet 1/2018|yes| |
| | |Acacia Patterson|Tate, Physics |patterac@oregonstate.edu|?|Janet 10/2018|no| |
| | |Yunfei Bo|Wang, EECS |boyu@oregonstate.edu|?|Acacia, 2019|no| |
| | |Bokun Zhou|Wang, EECS |zhoubok@oregonstate.edu|?|Aaron, 2018|no| |
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| [[http://www.mmr-tech.com/|MMR]] presentation on [[http://www.mmr-tech.com/PDFs/jThomsonPPT.pdf|Joule-Thomson refrigeration]] and on [[http://www.mmr-tech.com/PDFs/opticalStudiesPPT.pdf|optical cryostats]] (which we adapted for Hall measurements). | [[http://www.mmr-tech.com/|MMR]] presentation on [[http://www.mmr-tech.com/PDFs/jThomsonPPT.pdf|Joule-Thomson refrigeration]] and on [[http://www.mmr-tech.com/PDFs/opticalStudiesPPT.pdf|optical cryostats]] (which we adapted for Hall measurements). |
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| | ===== Videos ===== |
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| MRS [[https://mrs.digitellinc.com/mrs/sessions/31953/view|webinar on measuring the Hall Effect faster]]. Jeff Lindemuth from Lakeshore. Need MRS account, but can create one free. | MRS [[https://mrs.digitellinc.com/mrs/sessions/31953/view|webinar on measuring the Hall Effect faster]]. Jeff Lindemuth from Lakeshore. Need MRS account, but can create one free. |
| An [[https://www.youtube.com/watch?v=AcRCgyComEw|elementary tutorial]] (ball and string!) on the Hall effect (6 min YouTube) | An [[https://www.youtube.com/watch?v=AcRCgyComEw|elementary tutorial]] (ball and string!) on the Hall effect (6 min YouTube) |
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| A [[https://www.youtube.com/watch?v=AJ7zwIPygyU|tour of the LakeShore 7704 Hall Effect System]] (13 min YouTube) | A [[https://www.youtube.com/watch?v=AJ7zwIPygyU|tour of the LakeShore 7704 Hall Effect System]] (13 min YouTube) Not exactly like our system, but has lots of similarities. Actual equipment. |
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| | Demonstration of [[https://www.youtube.com/watch?v=aEj407pBX4E|measuring resistance with an 7605 Hall card]]. You tube (10-ish min) |
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| | The [[https://www.youtube.com/watch?v=bAkNC1wIlGc|Van Der Pauw Method of Measuring Hall Effect to Determine Mobility, Carrier Type & Concentration]], (YouTube 8:39) LakeShore Academy - clear description of terms (no actual equipment) |
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| ====== About the Equipment ====== | ====== About the Equipment ====== |
| The **ammeter** maxes out at 2mA. If you want an excitation current over 2mA, then you have to short it (back of the rack, move the BNC cable from "2mA max" to "Shorted." The software will prompt you when you go over 2mA, but it will not prompt you when the excitation current is below 2mA, so if you're not able to measure a current, check that the last user didn't leave the ammeter shorted. | The **ammeter** maxes out at 2mA. If you want an excitation current over 2mA, then you have to short it (back of the rack, move the BNC cable from "2mA max" to "Shorted." The software will prompt you when you go over 2mA, but it will not prompt you when the excitation current is below 2mA, so if you're not able to measure a current, check that the last user didn't leave the ammeter shorted. |
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| Sometimes the HMS software has trouble communicating with the equipment. If this happens, you can try just restarting the program, but this usually doesn't work. The most successful approach is: do Ctrl-Alt-Delete and bring up the Task Manager, then kill all the HMS* processes. Failing that, restart everything. | |
| | //Problem//: Hall Measurement Software(HMS) won’t communicate with Magnet Power Supply (MPS) |
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| | //Solution//: Check the VI “mode”switches on the back of the power supply. Make sure they are switched to “EXT”mode (see page 2-5 of MPS Manual). |
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| | //Problem//: Doing well with hardware and measurement setup but not able to execute the measurement from the software (the measure button is in grey and not able to click). Meanwhile, the system log at the top right of the screen shows an error “Problem Talking to Keithley 2400 …”. |
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| | //Cause and Solution//: It is likely that the user login with his/her own ONID but the equipment is still connecting to the lab-shared account. The equipment does not support parallel connection with multiple accounts so it reports an error. To solve the problem, login with the lab-shared account. Users may find username and password near the screen. |
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| | //Problem//: HMS software has trouble communicating with the equipment. |
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| | //Solution//: Try restarting the program, but this usually doesn't work. The most successful approach is: Ctrl-Alt-Delete and bring up the Task Manager, then kill all the HMS* processes. Failing that, restart everything. |
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| **Software**: Open "HMS". You do a manual resistance measurement, field measurement or temperature measurement (top bar, right). First step is usually an I-V measurement ... to be continued. | **Software**: Open "HMS". You do a manual resistance measurement, field measurement or temperature measurement (top bar, right). First step is usually an I-V measurement ... to be continued. |
