Mascom MC513000, Руководство по эксплуатации, Страница: 18 / 27

GC-APPI Interface Page 18
Tune the MS
Turn on the MS and tune the mass spectrometer
in APPI mode. Make sure the APPI lamp switch is
in on position (blue LED is on, see Figure 25).
Figure 25: APPI source with lamp switch
If the APPI lamp is off, the noise level will be very
high (see Figure 26).
Figure 26: MS tune spectrum when APPI lamp is
off
When using a dopant gas you can tune the MS
using the dopant gas’ molecular ion (i.e. m/z 92
for toluene). Without a dopant gas the easiest
way to tune the MS is to select a GC column-bleed
ion like m/z 207 or similar.
Once the tuning is optimized, save the Tune file
(an example can be seen in Figure 27).