10 C4 Manual Rev 7.5.2
1.2 General Description
Using the model C4, temperature control is available manually from the front
panel, by use of user entered programs, or via remote control via either a EIA-232
or IEEE-488 GPIB. The controller has a precision temperature reading capability
with a digital read-out. Two temperature probes can be connected to the
controller allowing either probe or both probes to be the control probe(s) while
either probe can be used to take measurements.
Two additional controlled device ports are available. They are intended for on/off
control of a refrigeration compressor and an external load such as a device under
test, or a main chamber or platform power relay. These ports normally are
supplied as TTL level (low voltage) ports but are optionally available with solid
state relays to control line voltage as in the case of units with mechanical
refrigeration. The compressor control port may be toggled from the front panel at
any time in the manual (LOCAL) mode. The compressor is designed to not cycle
on and off with the temperature control function.
The controller operates in each of four modes:
Local
Mode
Single Setpoint control from the front panel. Simple
Start/Stop functionality.
Program
Mode
Programmed control using programs entered, stored, and
run from the front panel. 100 Temperature/Duration
Program steps available. Multiple programs may be stored
and called as needed.
Remote
Mode
Control via EIA-232 or IEEE-488 GPIB. The IEEE-488
interface implementation is a TALKER/LISTENER with
serial poll. Extended addressing and parallel poll
capabilities are not supported. The EIA-232 interface is
fully configurable for baud rate, data bits, stop bits and
parity.
Setup
Mode
Used to define and store operation and environment
variables that control how the C-4 behaves.