GPIB controlled BNC switch/relay - Page 1
Forum section: electronics / projects

author: mechknoll
author_rank: Contributor
timestamp: August 24, 2014, 04:31:05 pm
content: Good day folks,So I have a need for an inexpensive solution to switch between two BNC signals. I just finished developing a nice labview program to control a new 9T CCR Superconducting magnet system. Which is quite sexy! I can post some pics for anyone interested. There are two samples that can be mounted and I made a BNC connector box with 4 BNC terminals. two for each sample. ...Current and Voltage. What I am wanting is a GPIB controlled switch that will switch from sample one to sample two. Dave's recent video with the HP 3488A GPIB Matrix Switch gave me hope and was perfect timing. Thanks for any help guys, and Gals!

author: mechknoll
author_rank: Contributor
timestamp: August 24, 2014, 04:38:21 pm
content: Check it out!

author: Dr. Frank
author_rank: Super Contributor
timestamp: August 24, 2014, 06:40:31 pm
content: Nice one!From Oxford Instruments?9T at which temperature? (Seems to need pumped He4)And what about the cryostat?And the PSU?Pictures, please!What's the purpose of your experiments?Frank

author: plesa
author_rank: Frequent Contributor
timestamp: August 24, 2014, 07:28:53 pm
content: Quote from: mechknoll on August 24, 2014, 04:31:05 pmWhat about using NI USB-6501 (24-ch, 8.5 mA) controlled over USB for switching, it is pretty chep (100 USD) and some reed relays like Meder Hi series?

author: mechknoll
author_rank: Contributor
timestamp: August 24, 2014, 08:56:23 pm
content: Thanks plesaI am looking into this now. I need to make sure there will be no noise coupled into the measurement system as this is for very precise resistivity measurements as well as differential conductivity and hall measurement. It looks like it wont be a problem. Maybe I should just buy and find out...Here are a few more pics. The system is from Janis. 9T from 4.5K to 300K with a one shot down to 1.5K where it can hold for about 4 hours. Our lab focuses on superconductivity and nano magnetism. We have a unique repertoire of equipment for sample preparation and measurement. We are also home to the largest university run reactor, MURR. Where we use neutron scattering to explore quantum critical phenomena. Behind this picture is a SQUID system and a PPMS in the other room. It is nice to finally have a CCR system, He gets EXPENSIVE!The superconducting magnet controller and temperature controller are both LakeShore, the 625 and 336 respectively.

author: mechknoll
author_rank: Contributor
timestamp: August 24, 2014, 09:06:59 pm
content: Here's the system

author: plesa
author_rank: Frequent Contributor
timestamp: August 24, 2014, 09:22:38 pm
content: Nice lab, what is purpose of the magnetophon? :-)

author: AlfBaz
author_rank: Super Contributor
timestamp: August 24, 2014, 09:30:47 pm
content: Quote from: mechknoll on August 24, 2014, 04:31:05 pmBe aware that the 3488 is just the control box and that there are various types of plug in cards available. I'm almost certain there are cards with BNC inputs

author: mechknoll
author_rank: Contributor
timestamp: August 24, 2014, 09:41:48 pm
content: It serves no purpose other than a reminder of how far we've come! Its a good dust collector too.