HP 5890 Series I and Series II Reference Manual (05890 ... - Ipes.us
HP 5890 Series I and Series II Reference Manual (05890 ... - Ipes.us
HP 5890 Series I and Series II Reference Manual (05890 ... - Ipes.us
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Temperature Control<br />
Oven temperature calibration<br />
The <strong>HP</strong> <strong>5890</strong> provides the means to (if necessary) reset oven temperature<br />
monitoring so the displayed ACTUAL value accurately represents the<br />
correct temperature.<br />
Oven temperature calibration requires entering the difference (delta)<br />
value (in �C) between an independently measured temperature value<br />
vers<strong>us</strong> the corresponding displayed oven temperature value:<br />
Correction Value =<br />
Measured Temperature (�C) - Displayed Temperature (�C)<br />
For example, if actual measured oven temperature were found to be<br />
148.73�C, while the corresponding displayed value was 150.00, the<br />
calibration difference value to be entered would be -1.27.<br />
Setting the oven calibration value<br />
An oven temperature calibration measurement should be made at a<br />
temperature in the middle of the range of interest. Allow ample time (up<br />
to 1/2•hour)for thermal equilibration at the selected temperature; no<br />
drift should be observed. The temperature•sensingprobe should be placed<br />
in the region of the oven occupied by the column(s).<br />
1. Through the keyboard, select CALIB AND TEST mode, function 1:<br />
CLEAR .<br />
1 ENTER<br />
CALIB is displayed, followed by two values: the observed oven<br />
temperature (to 0.01�C), <strong>and</strong> the current difference (delta)<br />
calibration value.<br />
Note: Record the displayed calibration delta value! If problems are<br />
encountered in recalibration, the value may be reentered.<br />
2. Assuming no drift in temperature, the new difference (delta) value is<br />
then entered by pressing appropriate number keys, followed by ENTER :<br />
appropriate value ENTER<br />
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