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Chapter 11 Configuring by using the menus
Page 11.35
Passwords and security
Securable and non-secure modes
The 7951 can work in a non-secure or securable mode. In non-secure mode, anyone can have access to any of the
facilities. In securable mode, access to facilities can be protected by passwords.
Changing security mode
On the 7951 you change the security mode by using the key switch on the front of the instrument. The instruments are
normally securable but, when you insert the key and turn it clockwise, this changes the mode to non-secure. You can
only withdraw the key in the vertical (securable) position.
1. Security Level LED. 2. Security Lock
Figure 11.39 The security lock on the 7951
Security levels
The password system restricts access to its facilities to those people with certain levels of authority. There are four levels
of security:
x Calibration.
x Engineer.
x Operator.
x World (anyone other than those listed above).
The table below lists what facilities each of these groups can access.
Access levels
Facilities available Programmer Engineer Operator World
Calibration facilities YES NO NO NO
Programmable parameters
except security codes
YES YES NO NO
Security codes YES NO NO NO
How the security LED
appears
RED flashing RED ORANGE GREEN
Note: Some versions of 795x software do have a “Operator” level that can change limits.
Switching between levels
This is achieved by selecting the “Password” option (from the main menu) and then entering the appropriate security code
for the level required. A correctly entered security code will cause the access the level to change. However, an
incorrectly entered security code will change the access level to “World”.