Advanced Instruments 4250, User Manual

Page: 37 / 121

Supervisor/Operator keyswitch (Figure 7)
The Operator position of the Supervisor/Operator keyswitch provides
a means of locking out the setup and calibration functions of the instru-
ment to help prevent unauthorized changes.
The
Operator keyswitch position allows access to the sample and test
function only; the Supervisor keyswitch position allows access to the
setup, test and calibration functions, as well as the sample and test func-
tions.
If the
SETUP or CALIB key is pressed while the Supervisor/
Operator keyswitch is in the Operator position, a “ Supervisor Key
Needed; Press STOP to Continue ” message is continually scrolled
across the display until STOP is pressed. When STOP is pressed, the
message will change back to “ Ready ” , re-enabling the sample test func-
tion.
15
Instrument Operation
Figure 7: Back Panel
RS-232 Port
Supervisor/Operator
Keyswitch
Barcode Port
Power Module