60 cHAPTER 4: Operation
Model 336 Temperature Controller
4.4.11 Input Name
To increase usability and reduce confusion, the Model 336 provides a means of
assigning a name to each of the four sensor inputs. The designated input name is used
on the front panel display whenever possible to indicate which sensor reading is
being displayed. It is also used in the output section of the custom display mode to
denote which sensor input is associated with the displayed output to form a control
loop. Refer to section 4.2.3 for Alpha-Numeric entry.
Menu Navigation:
Input SetupQInput (A, B, C or D)QInput NameQ(15 Character String)
Default: Input (A, B, C, D)
Interface Command: INNAME
4.4.12 Temperature
Limit
The Temperature Limit parameter provides a means of protecting your equipment
from damage by shutting down all control outputs when the assigned temperature
limit is exceeded on any sensor input. The parameter is available for each of the four
sensor inputs. A temperature limit of 0 K (default value) turns this feature off.
Menu Navigation:
Input SetupQInput (A, B, C or D)QTemperature LimitQ(0K to 2999K)
Default: 0.0000 K
Interface Command: TLIMIT
4.4.13 Preferred Units
The Preferred Units parameter setting determines which units are used to display
setpoint and max/min parameters whenever these parameters are displayed in any
display mode. The sensor reading is also displayed in Preferred Units in all display
modes except for the Custom display mode, where each sensor location can be
assigned specific display units.
Menu Navigation:
Input SetupQInput (A, B, C or D)QPreferred UnitsQ(K, C, or Sensor)
4.4.14 Max/Min
The Max/Min feature captures and stores the highest (Max) and lowest (Min) reading
taken since the last reset. The Preferred Units parameter, under the Input Setup
menu, determines the units used for capturing Max and Min.
Max and Min are always being captured, so there is no need to turn the feature on or
off. The readings are reset when the instrument is turned off, sensor input parameters
are changed, or the Max/Min Reset key is pressed.
Menu Navigation:
Max/Min Reset
4.5 Output and
Control Setup
Once the sensor inputs have been configured (section 4.4), the outputs can be config-
ured. The Output Setup menu is used to create control loops for controlling tempera-
ture, whether using feedback (closed loop) or manually setting the output (open
loop). This section describes how to operate the output and control features, and how
to set control parameters. Each control parameter should be considered before turn-
ing on a control loop output or the instrument may not be able to perform the most
simple control functions. A good starting point is deciding which control loop to use,
whether to operate in open or closed control mode and which tuning mode is best for
the application. Other parameters fall into place once these have been chosen.
Section 2.7 of this manual describes the principals of closed loop proportional, inte-
gral, and derivative (PID) control.
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