Keyboard and Displays
Keyboard operation, INET control
37
CLEAR
is used anytime during setpoint entry, prior to pressing
ENTER
,
to erase the entry in progress.
CLEAR
, if pressed when no setpoint entry is in progress, displays
HP 5890 readiness .
Run Control Key
START
, if pressed while a setpoint entry is in
progress, causes the entry to be aborted.
If a particular key is not valid, it is simply ignored if pressed during
setpoint entry.
While an entry is in progress, other instrument function keys are
ignored if pressed, until the current entry is terminated and stored
(
ENTER
) or erased (
CLEAR
).
Keyboard operation, INET control
In general terms, HP 5890 operation is the same whether the instrument
is under local control or INET control (controlled by a separate device). If
the HP 5890 is to be controlled through INET, the following should be
noted:
In the event communication is lost (e.g., by power lost at one or more
devices on the loop, a disconnected INET cable, etc.), HP 5890
START
and
STOP
keys will be disabled.
Should the HP 5890 keyboard exhibit problems (keys inactive) while
under INET control, disconnect INET cables at their HP 5890
receptacles; then switch power to the HP 5890 off, and then on. The
keyboard should behave normally (assuming the HP 5890 itself has
no problems).
To restore INET control, check that all devices on the loop are
powered on, and that all INET cables are installed properly. The
system should return to normal operation automatically.
