Keyboard and Displays
Displaying setpoints
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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:
Alphanumeric 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.
LED 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:
ACTUAL SETPOINT
OVEN MAXIMUM 400
Example, a Typical Alphanumeric Setpoint Display
Figure 2-2
The name of the function key pressed is always displayed, along with the
current setpoint and/or measured values.
