HP 5890 II, 5890 II Plus manual 37

Keyboard and Displays

Keyboard operation, INET control

C CLEAR is used anytime during setpoint entry, prior to pressing ENTER, to erase the entry in progress.

C CLEAR, if pressed when no setpoint entry is in progress, displays HP 5890 readiness .

CRun Control Key START, if pressed while a setpoint entry is in progress, causes the entry to be aborted.

CIf a particular key is not valid, it is simply ignored if pressed during setpoint entry.

CWhile 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:

CIn 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.

CShould 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).

CTo 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.

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