Chapter 3 Menus
3-16
0Disabled 512.5%
130.0% 610.0%
225.0% 77.5%
320.0% 85.0%
415.0% 92.5%
Note: The Crystal Quality setting is very sensitive to PID loop tuning. It is best to leave
Crystal Quality disabled until you are confident of your process and PID settings.
Crystal Stability: As material is deposited on the crystal, the frequency normally
decreases. However arcing, mode hopping, or external stresses may cause the crystal
frequency to increase. If the accumulated value of these positive frequency shifts (or a
single large positive shift) exceeds a threshold during a process, a crystal fail condition
is indicated.
0Disabled 5200 Hz
15000 Hz (1250 Hz single shift) 6200 Hz (100Hz single shift)
21000 Hz 7100 Hz
3500 Hz 8100 Hz (50Hz single shift)
4400 Hz 925Hz
Xtal Fail Mode: Programs the action when the last sensor assigned to a film fails.
Selecting Halt stops the process. When Timed Power is selected, the instrument uses
the last valid rate, thickness, and power readings to calculate the time required to reach
final thickness. The power is fixed at the last valid reading and deposition continues for
the calculated time. Because there are no sensor readings, this is only a rough
estimate. The more stable the process, the more accurate the estimate.
Material: Selects a material assigned to this film. As materials change, their density
and Z-Factor are updated.
Density: Sets the density for this material. Material density has a significant impact on
deposition calculations.
Z-Factor: Sets the Z-Factor, an empirically determined measure of a material’s effect
on quartz crystal frequency change.
Ramp 1: Ramp power sets the power level desired at the end of the ramp phase, in %
of Scale 1,2. Ramp time sets the time to ramp linearly from the initial power to the Ramp
power. Soak time sets the time the output remains at the ramp power level.
Ramp 2: Ramp 2 functions are the same as Ramp 1. Typically, Ramp 2 power is set
near the power level required to achieve the desired initial deposition rate.