INFICON STC-2000A Thin Film Deposition Controller Operating Manual - Manual (Page 147)

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STC-2000A DEPOSITION CONTROLLER
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Crystal Sensor Inputs
These connectors are the remote sensor oscillator’s interface to the STC-2000A. These
connections are both the signal and power path to the oscillator. The supplied power is 5 volts at 50 mA.
The input impedance is 50 ohms and the signal level is 1 volt peak to peak. This connection should always
be made with coaxial cable. Type RG58 or RG59 is recommended. Cable lengths up to 100 feet are
acceptable. These cables in 10 and 30-foot lengths are available as standard parts from Sycon.
SECTION 4.6
Analog Control Voltage Connections
There are 2 identical analog output voltages available from the sensor card on a single connector.
Power Supply Connection: This refers to the high current (or voltage) power supply that provides the
energy to create the evaporant stream. The power supply connection on the STC-2000A has the control
voltage that controls the high current (or voltage) power supply. From the STC-2000A point of view, this
is known as the source control voltage. The word source describing the source material of the deposition
process in the form of an evaporant stream. Along the bottom of the back panel, in the area where sensor
cards may reside, is the text label SOURCE. This is meant to indicate the 9 pin D-sub that is part of the
sensor card. The text labels ½ refers to the control voltage outputs. In the sensor card slot, this indicates
control voltage 1 and control voltage 2. Given the standard hardware configuration, that with 1 sensor
card, one of the control voltages is meant to control the high current (or voltage) power supply just
described and the other control voltage is normally meant for the strip chart recorder control. These
identical analog outputs can be interchanged. In fact, their function is assigned by means of menu
programming. If the two functions (control voltage and recorder) are assigned by menu programming on
the same analog channel, the control voltage will have precedence and the recorder function will be lost.
After these programmed outputs are used in a film, a conflicting recorder function having been lost in this
way would require a reboot to recognize a correcting change. The analog output used for the control
voltage output has a number of programmable parameters associated with it. One in the MAIN/ REVIEW
FILMS menu path is: SS MAP SELECT. Another one in the MAIN/ REVIEW MAPS menu path is: source
out channel. Don't overlook the ground connection (connector shell). Shielding goes a long way toward
noise reduction and ultimately contributes to a stable system.
Strip Chart Recorder Connection: This refers to the STC-2000A output from the 9 pin D-sub on the
sensor card that can provide the proper analog signal for a strip chart recorder. Along with the hardware
connection, the analog output used for the strip chart recorder has a number of programmable parameters
associated with it. Two in the MAIN/ EXEC/ SYSTEM CONFIG menu path are: recorder function I/O
control and recorder out channel. Don't overlook the ground connection (connector shell). Shielding goes
a long way toward noise reduction and ultimately contributes to a stable system.
Control Voltage Output Connection
Except for the possible single output per unit used for the strip chart recorder, the other output is
intended to provide the rate control voltage for the deposition source power supply. The voltage is
programmable in range through the review maps menu as described previously. The isolated single ended
output provides up to 10 ma at 2.5, 5, and 10 volts, both positive and negative relative to the channel
common. The control output voltage connections for outputs 1 and 2 (on the sensor card) are as follows:
[for optimum noise immunity, it is recommended that a shielded, twisted pair cable be used to make the connection
from the STC-2000A to the power supply control input or strip chart recoder of the deposition system]
SECTION 4.XX page 147 of 292