This is the multi-page printable view of this section. Click here to print.

Return to the regular view of this page.

Launching OVJ

Launching OVJ and setting the spectrometer frequency.

Launching OVJ

OVJ can be launched in two different ways: 1) by double-clicking the vnmrj icon on the desktop or, 2) by opening a terminal window and launching it from the command line by typing:

1

vnmr

Setting the Spectrometer Frequency

If this is the first time you are using OVJ, the spectrometer frequency has to be set to the correct value.

Note

The first time you launch OVJ the spectrometer frequency has to be set. Once the spectrometer frequency has been set the value will be stored by OVJ and does not have to be entered every time the user starts OVJ.

In OVJ, the spectrometer is historically set by setting the frequency of the deuterium (2H) lock frequency.

The ratio between the (1H) and (2H) frequency is approximately 6.51. For example, to set the spectrometer to a 1H frequency of 14.5 MHz the user has to set the spectrometer frequency to 14.5/6.51 = 2.227 MHz. To set the spectrometer frequency:

  1. In OVJ go to Edit -> System Settings

  2. In the window that appears enter the deuterium (2H) lock frequency in MHz.

Alternatively, the spectrometer frequency can be set from the OVJ command line using the lockfrequency parameter:

1

lockfreq = 2.27

Next, you are ready to Tune the Probe.