Lake Shore 350, User Manual

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130 c
HAPTER
6: Computer Interface Operation
Model 350 Temperature Controller
The applications are launched from the Utilities web page using Java™ Web Start
technology. This allows the application to run outside of the web browser in a stand-
alone window. The application can only be launched using the link in the embedded
web page, and cannot be permanently installed. When launching the application,
multiple security warning messages may appear. These messages are meant to pro-
tect youfrom malicious software that can cause harm to, or compromise the security
of, your computer or your data. The applications have been thoroughly tested and are
considered by Lake Shore to be safe.
All software is imperfect and any software may be used by a malicious user for malicious
purposes.
6.5.1 Embedded
Curve Handler™ The Embedded Curve Handler™ utility is provided for uploading temperature curve
files to the Model 350. The utility is also capable of reading curves from the
Model 350 and writing them to a file for storage, or manipulation in a third party pro-
gram. The Embedded Curve Handler™ supports standard Lake Shore temperature
curve files in the “.340” file format, and the Microsoft Excel® ".XLS" (Excel® 97 - 2003)
file format. Curve files are provided with calibrated sensors purchased from
Lake Shore in the “.340” file format.
To read a temperature curve from a file:
click Read from File . Select a properly format-
ted temperature curve (*.340 or *.XLS) file using the Open Browser dialog box. The
curve will be loaded into the program and the curve points and graph will be dis-
played.
To read a temperature curve from the Model 350:
click Read from Instrument . The
Read Curve from Instrument dialog box appears. Select a curve from the drop-down
box and click
OK . The curve will be loaded into the program and the curve points and
graph will be displayed.
Once a curve is loaded into the Embedded Curve Handler™ using either the Read
from File or Read from Instrument buttons, the loaded curve can be stored either to a
user curve location (21 to 59) in the Model 350, or to a file.
To store the curve to a user curve location in the Model 350:
click Write to Instru-
ment. The Write Curve to Instrument dialog box appears. Select a user curve location
to write the loaded temperature curve to, and click OK .
To write the currently loaded curve to a file:
click Write to File . A Save Browser dialog
box appears. First use the Files of Type drop-down box to select the file format in
which to save the curve. Then choose a directory and a file name, and click
Save .
The .340 file format is an ASCII text file which can be read and altered using a stan-
dard ASCII text editor. Care must be taken when altering the .340 text files to ensure
that all of the values are stored in the same position in the file as the original values,
using the same number of digits. To alter curve files, it is recommended to use the .XLS
file format, which can be altered using Microsoft Excel®. If using formulas to alter
curves, you must copy the results of the formulas and paste them back into the origi-
nal cells of the breakpoint values. The Embedded Curve Handler™ cannot interpret
formulas in cells. In most versions of Excel®, this can be done by copying the formula
results, then pasting them in the appropriate cells using the
Paste Special command,
and selecting Paste Values . Refer to the appropriate Microsoft Excel® documentation
for details on the Paste Special operation.