. Author manuscript; available in PMC: 2009 Jun 11.

Published in final edited form as: J Magn Reson. 2007 Sep 20;189(2):251–279. doi: 10.1016/j.jmr.2007.09.013

Table 3.

Stability of the 250 GHz operating parameters during CW operation

Technical parameter	Average value	Standard deviation	(%)
Filament voltage (V)	3.274	0.004	0.1

Filament current (A)	4.515	0.008	0.2
Beam voltage (kV)	12.090	0.047	0.4
Pressure (10⁻⁹ Torr)	3.430	0.019	0.5
Frequency (GHz)	250.559348	0.000359	0.000143
Power (diode units (mV))	229.75	1.94	0.8

Note from Table 3 that the power was stable to ~0.8% and the other parameters were well below this level including the frequency which showed a stability of 1.6 ppm.