BG 805 204 BE / B (0203) QMS200.oi
25
Correct tuning assures optimum measurement accuracy over the entire mass
range. The RF circuit has to be tuned:
•
upon exchange of the analyzer or electronics
*)
•
when a corresponding error message is displayed.
An annual tuning check is also recommended.
!
Remove the small cap at the side of the QME. This hole gives access to the
tuning screw.
"
Start the TalkStar software. In the
context menu of "Devices", click
"Tune HF" with the right mouse
button.
#
Use the tune lamp of the QME as tuning indicator.
Caution
Turn the tuning screw carefully, no force is required. Do neither fully
tighten nor unscrew it completely.
tune
#
slightly detuned. Turn the tuning screw …
a) clockwise until the lamp is on
b) counterclockwise until the lamp is off and continue turning
until the lamp is on again
c) clockwise by one full turn
The RF generator is now tuned
#
tune.
tune
#
severely detuned. Turn the tuning screw …
a) clockwise to the stop
b) counterclockwise until the lamp is off and continue turning
until the lamp is on again
c) clockwise by one full turn
The RF generator is now tuned
#
tune.
$
Reinstall the cap.
%
After tuning the RF generator, quit the "Tune" mode with "OK".
*)
If the analyzer and electronics have not been delivered together as one unit, the
RF circuit has to be tuned when the unit is put into service for the first time.
5.2.4 Tuning the RF Generator
