[spd,qual] = PR650measspd(S,[syncMode])
Make a measurement of the spectrum. Tries to be smart
about using sync or not, unless it is turned off by
syncMode = ‘on’: Try to sync integration time with display. Retry without if it fails. (default)
syncMode = ‘off’: Don’t try to sync.
8/26/10 dhb Add DEBUG option to figure out why this dies sometimes.
3/8/11 dhb Pass syncMode option to speed things up for displays where it doesn’t work.