In preparation for doing a diffusion coefficient measurement, I am
calibrating gradient strengths using a water sample containing a teflon
phantom. The experiment is working nicely but I am curious about some
aspects of the calibgp pulse program (listed below). There are several
delays in the pulse program (de1,de2,de3) which I don't understand. I don't
know how they are set and what their values are. They don't show up in the
'ased' window and they don't seem to be calculated in the program.
Are they set automatically? (My instrument is a DRX.)
Thanks.
***********************************
Donald M. Leek
Chemical Biology NMR Laboratory
Steacie Institute for Molecular Sciences
National Research Council Canada
Ottawa, Canada K1A 0R6
phone: (613) 993-6356
fax: (613) 952-0068
email: don.leek@nrc.ca
http://chembio.sims.nrc.ca/~nmr/info
***********************************
;calibgp
;avance-version
;calibration of gradient strength
#include <Avance.incl>
#include <Grad.incl>
define delay GR_LEN
"p2=p1*2"
"d11=30m"
"d12=20u"
"GR_LEN=aq*0.5"
1 ze
2 d1 BLKGRAD
p1 ph1
50u UNBLKGRAD
GR_LEN gron1
d16 groff
p2 ph2
50u
d16
de1
de2 adc ph31 syrec
de3 ph30
aq gron1
d12 groff
rcyc=2
wr #0
d11 BLKGRAD
exit
ph1=0
ph2=1 3
ph30=0
ph31=0
;pl1 : f1 channel - power level for pulse (default)
;p1 : f1 channel - 90 degree high power pulse
;p2 : f1 channel - 180 degree high power pulse
;p16: homospoil/gradient pulse : ca. aq/2
;d1 : relaxation delay; 1-5 * T1
;d11: delay for disk I/O [30 msec]
;d12: delay for power switching [20 usec]
;d16: delay for homospoil/gradient recovery
;d28: delay for gradient : d28 = aq
;NS: 2 * n
;use gradient : gp 1
;this program can be used for dmx as well
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