Keyboard and Displays

Displaying setpoints

HP 5890 SERIES II (hereafter referred to as HP 5890) operation is monitored and controlled through its front panel keyboard, and alphanumeric and LED displays.

Some instrument functions are monitored continuously: signal levels, temperatures, carrier gas flow rates (if electronic flow sensing is installed), and inlet purge valve status (if a split/splitless capillary inlet is installed).

There are two general display areas:

CAlphanumeric Display. Echoes keys pressed at the HP 5890 keyboard show current setpoint values for instrument functions; actual values of continuously monitored instrument functions; and warning, error, information, and diagnostic messages.

CLED Display. Consists of two parts: the left half (OVEN) displays oven status during a run; the right half (STATUS) gives overall instrument status at any given time.

Displaying setpoints

Any particular instrument current value and/or setpoint is displayed at the alphanumeric display simply by pressing the appropriate instrument function key followed possibly by additional •modifier" keys necessary to

further define the function (i.e.,

A or

B , SIG 1 or SIG 2 , ON or OFF ,

TIME ). For example, pressing

OVEN MAX

might give the display:

Figure 2-2

ACTUAL

SETPOINT

 

 

OVEN MAXIMUM

400

Example, a Typical Alphanumeric Setpoint Display

The name of the function key pressed is always displayed, along with the current setpoint and/or measured values.

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