Stir/Freeze Wire Alignment section for proper alignment of the sample
probe and the stir wire. Refer to the Stir/Freeze Amplitude Adjustment
section to properly adjust the stir and freeze amplitudes.
Check error messages. The software of your instrument is designed in
such a way that any incomplete task will be associated with an error
message, many self-explanatory, that will help you discover the source
of your problem. You can find all error messages and descriptions of
what they mean in Appendix A.
Internal diagnostic tests
The diagnostic menu allows any of a series of tests to be run to check
one functional subsystem of the instrument, or to perform some neces-
sary adjustment or setup.
An item on the TEST menu may be selected in either of the following
two ways:
• At “Select Test Item”, repeatedly press the > key to step the display
forward or < to step the display backward through the list. The list is
cyclic; pressing > at the last item cycles the display to item 0.
Continue pressing > or < until the desired test is displayed. While
the desired test is displayed, press the START key.
• Or, at “Select Test Item”, press the START key. The display will
change to “Test Menu #: 0”. Type the number of the desired test on
the numeric keypad. The “0” on the display will change to the num-
ber typed, if valid. Then press ENTER. The display will show the
selected test. Next, press the START key.
At “Select Test Item”, the following tests are available:
1. Statistics
The statistics option allows you to recall the stored results from a select-
ed last number of tests and calculate their average, standard deviation
and coefficient of variance. To use this option, use the following proce-
dure.
Advanced
®
Cryoscope Model 4250 User’s Guide
48
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