pulprog: Pulse Program, such as
TD Time Domain This specifies the number data points to be taken with the specified spectrum. A higher value for TD increases resolution, but also increases overall acquisition
time. TD values are typically set to a power of 2 value (i.e. 65536).
NS Number of scans This is simply the number of scans. Increasing the number of scans increases signal‐to‐noise ratio, but also increases overall experiment time.
DS Number of dummy scans This is simply the number of dummy scans. They are used to allow for T1 relaxation, and to allow for temperature stabilization in experiments with high power settings (i.e. decoupling or TOCSY experiments).
SWH spectral width in Hz Performs the same function as SW, but entry is in Hz instead of ppm. Changes to SWH result in changes to SW and DW .
FIDRES FID resolution Sets FID resolution in Hz. FIDRES is calculated based on SW, SFO1, and TD;
however, if FIDRES is adjusted, TD alone will be recalculated then adjusted to the nearest power of 2. As a result, values entered for FIDRES may change slightly after entry.
AQ Acquisition time Acquisition time is automatically calculated based on TD, SW, and SFO1;
therefore, this value generally is informational only. If AQ is changed, TD will be adjusted accordingly to match.
RG 0 ‐ 200 Receiver gain Controls the amplitude of the FID signal before it enters the digitizer. It is usually determined automatically through the use of the rga command, but may be set manually here. 200 is the maximum gain value that can be entered.
DW Dwell Time
Dwell time is the time between acquisition of two successive data points. While DW is normally calculated automatically based on SW, it may be adjusted manually. This will
result in a corresponding change to SW. Additionally, setting DW manually may result in a slight value
adjustment after entry, since DW is based on DECIM during oversampling, and DECIM only uses integer values. DE Pre‐scan delay This is the delay prior to sampling of data points. Four subdelays are part of this parameter: DEPA, DERX, DE1, and DEADC. These can be individually adjusted via the edscon command; however, they are typically left at default values of 1, 2, 3, and 4 μs, respectively. However, if DIGMOD is set
to analog, the four subdelays are not included and DE is automatically adjusted whenever SW or DW are changed.
D[0‐63] Delay lengths This is the array of lengths, in seconds, for delays 1 through 63. Like other arrays, the first is numbered at 0, not 1.
TD0 Loop counter
Used primarily for 2D experiments; does not usually need to be changed.
SFO1 – SFO8 MHz Irradiation freq. for channels 1 – 8 Typically automatically set automatically based on O1 – O8 and BF1 – BF8; usually should not be adjusted manually.
NUC1 – NUC8 Nucleus observed 1H, 13C, 15N, 19F, etc., off Defines the nucleus observed for up to 8 channels. 1D experiments without
decoupling will have only
NUC1; 1D experiments with decoupling will have NUC1 and additional channels
for decoupling specified; 2D experiments will have NUC1 and NUC2 specified, plus additional channels for any decoupling. All others should be set to off. To change a nuclei, it is necessary to click the (Edit)
button, and insure that the appropriate receivers and other hardware necessary to process the signal are properly selected on the graphic interface.
P[0‐63] Pulse lengths This is the array of lengths, in μs, for pulses 0 through 63. Note that the first pulse is numbered 0, not 1.
PL[0‐63] Power level This is the array of power levels, in dB, for pulses 0 through 63. These values can also be called up to assign power levels to individual channels (i.e. F1, F2)
