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XTC/3 Operating Manual
accessible. If rate control is not achieved (
) the
Delay Failure
Alarm
message appears. If
Stop on Alarms
is in the default setting of
No
, the power
continues to increment until
Max Power
is reached.
3.6.7 Crucible Switching
Crucible position output lines can be used to control evaporation sources with up
to eight crucible positions. When the
Crucible
parameter for a source is set to be
non-zero, power will not be applied to the source until the
Cruc x Valid
input
becomes active. A
Crucible Sw
message will be displayed during that time. After
thirty seconds without the
Cruc Valid
input becoming true (low), a
Crucible Sw
Fail
message will be displayed.
3.6.7.1 Bin Mode
In Bin mode, eight individual sequential outputs, labeled
Cruc Src 1 Bin
for
Source 1
crucibles or
Cruc Src 2 Bin
(XTC/3M only) for
Source 2
crucibles, one
per position, are used. See
for the fixed XTC/3S TTL output
assignments. These assignments will apply to the currently active source, 1 or 2.
In XTC/3M, either 8 sequential relay outputs or 8 sequential TTL outputs can be
assigned (see
).
3.6.7.2 BCD Mode (XTC/3M only)
In BCD mode, three sequential outputs are used so that 000 represents position
1 and 111 represents position 8. The BCD outputs, labeled
Cruc Src 1 BCD
for
Source 1
crucibles and
Cruc Src 2 BCD
for Source 2 crucibles, can be configured
through the
Relay or TTL Outputs
sub-screen of the
I/O Map
.)
3.6.8 Crystal Switching
XTC/3 offers a choice of Single, CrystalTwo, CrystalSix, Crystal12, Rotary or Dual
Head sensors. The CrystalTwo, CrystalSix, Crystal12, Rotary and Dual Head
sensors provide one or more backup crystals in case a crystal fails during
deposition. Sensor types are specified on the
Hardware
sub-screen of the
General
Parameter
display (
The CrystalTwo option requires the PN 750-212-G2 Dual Sensor with a
PN 779-220-G1 or PN 779-220-G2 XTAL 2 Switch.
The Dual Head option requires the PN 750-212-G2 Dual Sensor with a second XIU
in place of the PN 779-220-Gx XTAL 2 Switch. The normally uncovered crystal is
connected to Sensor 1, the backup crystal normally covered by the shutter is
connected to Sensor 2.
All multi-position and shuttered sensors require the Solenoid Valve
(PN 750-420-G1) and a feedthrough with an air tube.