All Off; Unpowered Analog Outputs; Warm Up Supply; Monitor Out - Lakeshore 336 User Manual

70 c 4: Operation
HAPTER
4.5.2 Unpowered
Analog Outputs

4.6 Interface

4.6.1 USB

Model 336 Temperature Controller

4.5.1.5.9 ALL OFF

The ALL OFF key is provided as a means of shutting down all control outputs with one
key. It is equivalent to setting the Heater Range parameter of all outputs to Off.
This function is always active even if the keypad is locked or when it is in remote mode.
The unpowered analog outputs, 3 and 4, are variable DC voltage sources that can
have a range from –10 V to +10 V. The voltage is generated by a 16-bit D/A converter
with resolution of 0.3 mV or 0.003% of full scale. These outputs can be configured to
Open Loop, Warm Up Supply, or Monitor Out modes. The Open Loop mode can be used
to set the output to a specific, constant value. Refer to section 4.5.1.4.3 for details on
the Open Loop Mode. The Warm Up Supply mode uses the output to drive the pro-
gramming input for an external power supply for the purpose of rapidly warming a
system to a user-specified temperature. The Monitor Out mode uses the output to
provide a voltage proportional to an input sensor reading to be used by an external
device such as a data logger.
The unpowered analog outputs are not designed to provide heater power, and although
they are short-protected, should not be used to drive a resistance lower than 1 k).

4.5.2.1 Warm Up Supply

Warm Up Supply mode is designed for controlling an external power supply used for
rapidly increasing the temperature in the controlled system, for example, to bring a
system to room temperature in order to change samples. Refer to section 5.5 for more
information on warm up supply operation. Refer to section 3.8.5 for the procedure to
install an external power supply for warm up supply mode.

4.5.2.2 Monitor Out

Refer to section 5.6 for more information on Monitor Out mode.
The Model 336 has three computer interfaces: IEEE-488, USB, and Ethernet. Only one
of these interfaces can be actived at one time. Use the Interface menu to configure
which interface is active, and to configure the parameters related to the selected
interface.
Menu Navigation:
InterfaceQ EnabledQ (USB, Ethernet, IEEE-488)
Default: USB
The USB interface is provided as a convenient way to connect to most modern com-
puters, as a USB interface is provided on nearly all new PCs as of the writing of this
manual. The Model 336 USB driver, which must be installed before using the inter-
face (section 6.3.3), creates a virtual serial com port, which can be used in the same
way as a traditional serial com port. Refer to Chapter 6 for details on computer inter-
face operation.
Menu Navigation:
InterfaceQEnabledQUSB