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Keyboard and Displays
Protecting setpoints
38
Additional information regarding INET control is available in Chapter 5,
Signal Output. Servicing may be required for one or more devices on the
INET loop if communication cannot be established.
Protecting setpoints
The HP 5890 provides a keyboard lock feature to minimize possibility of
stored setpoints being altered unintentionally. When the HP 5890
keyboard is locked, setpoint values (numeric values, A, B, OFF, and
ON) may only be displayed; they cannot be altered.
START
and
STOP
remain functional, so runs may be started or stopped.
To lock instrument setpoints, first enter the key sequence:
CLEAR
.
-
ENTER
Then press
ON
to lock the keyboard, or
OFF
to unlock the keyboard.
Figure 2•5shows displays occurring during this process.
ACTUAL SETPOINT
CALIB AND TEST [0-0]
ACTUAL SETPOINT
KEYBOARD LOCK ON
ACTUAL SETPOINT
KEYBOARD LOCK OFF
Keyboard Lock Displays
Figure 2-5