Oven Status - HP 5890 Series II Plus Reference Manual

Temperature Control

Oven status

In isothermal operation (
(zero), the HP 5890 internally sets run time to the maximum, 650
minutes.
A
B
In isothermal operation, and in one•or two•ramptemperature programs,
rate for the next ramp must be set to 0 (zero) to prevent further
programming.
In oven temperature programming, once any one of the five temperature
programming functions (
FINAL TIME
setpoint value, rolls the display successively through the entire group,
(including A and B displays for second and third ramps).
This is an efficient way in which to review and, if necessary, change oven
temperature program setpoints.
Oven status
During a temperature•programmedrun, the LED OVEN display provides
indication of oven status at any given time:
Isothermal Run: Assuming
than 0, and that
remains lit throughout the run.
Single•Ramp Temperature Program: The three LEDs, INITIAL
TIME, RATE, and FINAL TIME, successively light to indicate position
in the temperature program.
Multiple•Ramp Temperature Program: The three LEDs, INITIAL
TIME, RATE, and FINAL TIME, successively light to indicate position
in the first temperature program ramp.
Then RATE and FINAL TIME LEDs light alternately as the program
proceeds through the second (and third) ramp(s).
50
is included in key sequences defining parameters for a second ramp;
is included in key sequences defining parameters for a third ramp.
) is displayed, pressing
RATE
= 0 ), if
RATE
INIT TIME
,
INIT TEMP INIT TIME
, without entering a new
ENTER
is assigned a value greater
INIT TIME
= 0, only the INITIAL TIME LED is lit. It
is set equal to 0
, ,
RATE
FINAL TEMP
, and