Lake Shore Model 218 Temperature Monitor User’s Manual
Special Features
5-3
5.1.4 Entering a New Curve
To begin entering a user curve, press
Curve
Entry
. The first screen appears. Use the Data
Selection keys to select Edit Curve, then press
Enter.
The second display in the setting sequence
appears. Use the Data Selection keys to cycle
through the different inputs to which the curve
applies (
1-8
) and standard curves. If a standard
curve is selected, the curve view screen
appears. Standard curves are read-only; users
cannot change their parameters. When the
desired input or standard curve appears, press
Enter
.
The third display in the setting sequence
appears. Use the number keys to input up to a
ten-digit serial number for the curve to be
entered, then press
Enter
.
The fourth display in the setting sequence
appears. Use the Data Selection keys to select
the appropriate sensor format for the installed
sensor. There are three formats:
V/K
Volts vs. Kelvin for Diode sensors.
Ω
/K
Resistance vs. Kelvin for platinum
RTD sensors.
Log
Ω
/K
Log Resistance vs. Kelvin for NTC
resistive sensors.
When the desired format appears, press
Enter
.
Refer to Table 5-1 for recommended formats for
specific sensors.
The fifth display in the setting sequence
appears. Use the number keys to input an
appropriate upper temperature limit for the
installed sensor, then press
Enter
. Refer to
Table 5-1 for recommended temperature limits
for specific sensors.
The final display in the setting sequence appears. Use the number keys to input individual breakpoint
pairs of the curve. Press
Enter
both after inputting the sensor units and the temperature.
After entry of a breakpoint pair, the instrument displays a zero breakpoint. Enter up to 200
breakpoints. To exit the curve entry mode and store the new curve, press
Enter
on a new breakpoint
line. To enter a zero sensor units value, press zero before pressing
Enter
. The curve stores, but
users must select it for the appropriate input before it is used.
NOTE:
Escape
returns a single setting to its previous value. It cannot return a complete breakpoint or
an entire curve to a previous state.
Use the Data Selection keys to scroll up or down the breakpoint table. Only the breakpoint located at
the bottom line of the display is active for entry or editing.
