Fluke 9150 S, S, S

troller cannot respond verywell to changing conditions or noise in the system.

If the proportionalband is too narrow the temperature may swing back and

forth because the controller overreactsto temperature variations. For best con-

trol stability the proportional band must be set for the optimum width.

The proportionalband widthis set at the factory to about 30.0°C. The propor-

tional band width may be altered by the user if he desires to optimize the con-

trol characteristics for a particular application.

The proportionalband width is easily adjusted from the front panel. The width

may be set todiscrete values in degrees C or F depending on the selected units.

The proportional band adjustmentcan be accessed within the secondary menu.

Press “SET”and “EXIT” to enter the secondary menu and show the heater

power.Then press “SET” twice to access the proportional band.

S+E Access heater power in secondary menu

100.0 P Heater power in percent

SAccess set-point voltage

11.934 U Set-point voltage in millivolts

SAccess proportional band

ProP Flashes and then displays the setting

30.0 Proportional band

Tochange the proportional band, press “UP” or “DOWN.”

30.5 New proportional band setting

Tostore the new setting press “SET”. Press “EXIT” to continue without storing

the newvalue.

SAccept the new proportional band setting

The controllerhas a number of configuration and operating options and calibra-

tion parameters which are programmable via the front panel. These are ac-

cessed from thesecondary menu after the proportional band function by

pressing “SET”. Pressing “SET” again entersthe first of three groups of config-

uration parameters—operating parameters, serial interfaceparameters and cali-

9150 Portable Furnace

User’s Guide