Fluke 7341 - Controller Configuration; Probe Parameters; Operating Parameters; Cutout Reset Mode

Controller Operation
Controller Configuration 9
9-13
Controller Configuration
The controller has a number of configuration and operating options and calibration
parameters, which are programmable via the front panel. These are accessed from the
secondary menu after the cutout set-point function by pressing “SET.” There are 5 sets
of configuration parameters - probe parameters, operating parameters, serial interface
parameters, IEEE-488 interface parameters, and controller calibration parameters. The
menus are selected using the “UP” and “DOWN” keys and then pressing “SET”.
Pressing “EXIT” in any secondary menu exits and returns to displaying the temperature
(see Figure 9-1.).
Probe Parameters
The probe menu is indicated by,
PrObe Probe parameters menu
Press “SET” to enter the menu. The probe parameters menu contains the parameters, R0
and ALPHA, which characterize the resistance-temperature relationship of the platinum
control probe. These parameters may be adjusted to improve the accuracy of the bath.
This procedure is explained in detail in Chapter 11, Calibration Procedure.
The probe parameters are accessed by pressing “SET” after the name of the parameter is
displayed. The value of the parameter may be changed using the “UP” and “DOWN”
buttons. After the desired value is reached press “SET” to set the parameter to the new
value. Press “EXIT” to skip the parameter ignoring any changes that have been made.
R0
This probe parameter refers to the resistance of the control probe at 0°C. Normally this is
set for 100.000 ohms.
ALPHA
This probe parameter refers to the average sensitivity of the probe between 0 and 100°C.
Normally this is set for 0.00385°C
–1
.
Operating Parameters
The operating parameters menu is accessed by pressing “UP” when the probe menu is
displayed.
The operating parameters menu is indicated by,
PAr Operating parameters menu
Press “UP” to enter the menu. The operating parameters menu contains the cutout reset
mode parameter, cooling mode, and hot gas bypass mode.
Cutout Reset Mode
The cutout reset mode determines whether the cutout resets automatically when the bath
temperature drops to a safe value or must be manually reset by the operator.
The parameter is indicated by,
CtorSt Cutout reset mode parameter
Press “SET” to access the parameter setting. The cutout is set at the factory for manual
mode.
Cto=Auto
Cutout set for automatic reset