Shimadzu GCMS-QP2010 Series, Service Manual, Page: 49 / 168

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AC (52.5kHz) Adjustment
1. Select "Adjust 52.5kHz" from "Adjust Resolution" in the Tools menu.
2. The RF Power Supply AC Adjustment window opens. (Fig. 3)
Fig 3 RF power source AC adjust window
3. Set the following initial values.
RF Gain2 = 60 : Correction gain
AC Gain = 2800 : AC gain
AC1 = 320 : AC correction range
MZ AC0 = 130 : Initial mass number when AC applied
AC Coeff = 400 : AC correction coefficient
RES Coeff = 200 : RES correction coefficient
3.1 RF Gain2
RF Gain2 is a parameter that corrects the AC application when the peak full width
at half maximum (FWHM) is changed. Reducing RF Gain2 causes more
frequent AC application when the peak resolution is increased. Normally, the
initial value of 60 is left unchanged.
3.2 MZ AC0, AC Gain
AC must be applied linearly according to the mass number. The MZ AC0
parameter sets the mass number at which AC application starts at FWHM = 0.6.
AC Gain is the gain parameter for AC.
Signal strength
AC VALUE
RES VALUE
Peak full width at half maximum(FWHM)
Peak-valley ratio
Status display
AC parameters
Check Start button
Check Adjust
Start button
Check cancel
button
Adjust range
FWHM 0.6
±
0.05 AMU
VALLEY 0.5 Or less