Standard ²⁹Si sensitivity test sample: 85% Hexamethyldisiloxane in benzene-d₆.

Record a ¹H-coupled ²⁹Si spectrum.

The calibration of the ²⁹Si sensitivity test is performed using the standard ¹H-coupled ²⁹Si parameter set (the pulse program is set to pulprog zg).  

It is very important to use a long recycle delay, usually d1=5*T₁(²⁹Si) (for instance d1=1000 s). Use a single scan (ns=1).

Set p1 to the 90º ²⁹Si observe pulse at high power level pl1. This pulse is calibrated reaching the maximum signal for 90º and null point in 180º.

o1 is set on-resonance of the target resonance.

. Reference the line to 15.28ppm and plot the spectrum between 50 and -15 ppm. The Hexamethyldisiloxane has around ten pekas with a J-coupling of 6.66 Hz. The signal to noise ratio is calculated by typing sino real over a range of 10ppm. The quarz glas tubes give a background signal around -100ppm with a linewidth of approx. 4.8kHz.