Standard line shape test sample: 3% CHCl₃ in Acetone-d₆ for 100-400MHz and 1% CHCl₃ in Acetone-d₆ for 500-800MHz.

The calibration of the ¹H line shape is performed using a standard ¹H parameter set that can be loaded by typing rpar PROHUMP all (the pulse program is set to pulprog zg30).

The test is usually performed using a sample spinning rate of 20 Hz.

The basic parameter are set to:

d1=2
o1p=7.70
sw=3.332
td=16k
aq=9.83
ns=4
Due to different relaxation rates of chloroform-¹²C and chloroform-¹³C, fast repetition of scanning or the use of dummy scans (ds=0) will give satellites higher than 0.55%, arising from saturation of the main signal. The intensity of the satellites should be checked. Using a CY of 1000 should give 5.5 cm high satellites lines. Should the FID not have decayed to zero after the given acquisition time then increase SI and TD.

The AU humpcal program determine the width of the cloroform line at the height of the carbon satellites (0.55%) and at one fifth thereof (0.11%).

The line shape test is also performed without sample spinning. See spectrum