Teledyne 4020 – Hydrocarbon analyzer (special version for automatic background gas switching) - Manual (Page 63)

Total Hydrocarbon Analyzer Operation
Teledyne Analytical Instruments 45
4.6.8 Logging Out
The LOGOUT function provides a convenient means of leaving the
analyzer in a password protected mode without having to shut the
instrument off. By entering LOGOUT, you effectively log off the
instrument leaving the system protected against use until the password is
reentered.
To log out:
<▲▼> From the MAIN MENU scroll to field of LOGOUT
function.
<Enter> Press to logout
The screen will display the message:
Pressing will logout the current user and protect the system
from unauthorized changes to parameters. All users will still have access
to the SELF-TEST function and the instrument will function normally in
Analyze Mode. If you press , the current password will still be
in effect and the user has not logged off.
4.6.9 System Self-Diagnostic Test
The Model 4020 has a built-in self-diagnostic testing routine.
Preprogramming signals are sent through the power supply, output
board, preamp board and sensor circuit. The return signal is analyzed,
and at the end of the test the status of each function is displayed on the
screen, either as GOOD or BAD. If any of the functions fail, the System
Alarm is tripped. The following is an example of what is displayed at the
end of the diagnostic routine.
5 Volts Test – GOOD (status of the 5 volt power supply)
15 Volts Test – GOOD (status of the +/-15 volt power supply)
DACA Test – GOOD (status of the % of range analog output)
DACB Test – GOOD (status of the range ID analog output)
Pre-L Test – GOOD (status of the low gain of the amplifier)