INFICON STC-2000A Thin Film Deposition Controller Operating Manual - Manual (Page 81)

p
STC-2000A DEPOSITION CONTROLLER
y
This parameter assumes there is a shuttered head connected and that Rate Sampling can be used if
the film parameters are programmed for such. (Without the shutter, deposit would be continuous and negate
the advantage of this feature.) This feature extends the apparent life of the sensing crystal. It is used for
thick coatings or in systems where it is not possible to break vacuum to change the sensing crystal.
Depending on various factors in your particular system, the apparent crystal life can be extended up to 50
times by using the rate sampling feature of the STC-2000A. Five film parameters which pertain to this
feature are described in (Section 2.13).
____________________________________________________________________
Parameter
SAMPLE INTERVAL
Process Time; Range is 0:01 - 99:59
Units Min:Sec
Sample Interval Time
For either mode of operation this parameter will select the sampling interval of the sensor.
____________________________________________________________________
Parameter
SAMPLE DWELL TIME
Process Time; Range is 0:01 - 99:59
Units Min:Sec
Sample Dwell Time
For the Timed Mode selection this parameter sets the duration of sensor exposure.
____________________________________________________________________
Parameter
SAMPLE QUALITY
Quality Value; Range is 1 - 50
Units Percent
Sample Quality
In the Intelligent Mode this parameter sets the control quality required to terminate the exposure
period of the sensor.
____________________________________________________________________
Parameter
SAMPLE ALARM TIME
Process Time; Range is 0:0 - 99:59
Units Min:Sec
Sample Alarm Time
In the Intelligent Mode this parameter sets the maximum allowable time allowed to complete the
sensor exposure and control operation. The STC-2000A will treat this as a crystal failure when this limit is
exceeded.
____________________________________________________________________
Parameter
FILM FAIL MODE
Meas. Processing: select 1 of 2 choices;
Abort If Fail
Complete On Time Power
Units: None
Enabling Measurement Fail Processing
This parameter allows the user to select the system execution path if it is no longer possible to get
reliable measurement information from the sensor system. This is the last resort choice that will be made
after all other system configuration options have been exhausted. Choice 1) Abort If Fail, will abort the
deposition and set the output power to zero. Choice 2) Complete On Time Power, will set the unit into a
time power completion mode. In this mode the last reliable control power level will be maintained and
thickness accumulation will occur in a simulated fashion until the final thickness setpoint is reached. Post
deposition processing then will occur as programmed.
____________________________________________________________________
Parameter
CTL LOOP QUAL L
Select Value; Range is 0 - 9
Units None
SECTION 3.XX page 81 of 292