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ASTM Values for Probes and Magnets

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Updated 2/4/26

ASTM Standard Sample composition in a 5-mm NMR tube is: 

  • For 13C, 60% benzene-d6 and 40% p-dioxane
  • For 1H, 0.1% ethylbenzene in CDCl3 

CB500 – 146 RAL – Default Configuration is CryoProbe BBFO Probe (helium-based probe cooling) 

  • 1H one transient, S/N = 2000  
  • 13C one transient, S/N = 1200 

B600 – A151 CLSL – Default Configuration is Prodigy CryoProbe BBO (nitrogen-based probe cooling) 

  • 1H one transient, S/N = 1500
  • 13C one transient, S/N = 1000  

750NB – A151 CLSL - Default Configuration is Varian Indirect Detection Probe

  • 1H one transient, S/N = 900 
  • 13C one transient, S/N = 150 

UI500NB – 146 RAL - Default Configuration is Nalorac Indirect Detection Probe 

  • 1H one transient, S/N = 700 

UI600 – 55 Noyes Lab – Default Configuration is AutoX Broad Band Probe

  • 1H one transient, S/N = 300 
  • 13C one transient, S/N = 300