Lakeshore 325, Руководство пользователя, Страница: 60 / 166

Lake Shore Model 325 Temperature Controller User’s Manual
4-12 Operation
4.5.2 Resistor Sensor Curve Selection
Once the input is setup for the Platinum, Rhodium-Iron, or various NTC RTD sensors (Section 4.4.3), you may choose a
temperature curve. Standard curve numbers 6 and 7 being relevant to Platinum, or curves 8 and 9 being relevant to Rox
sensors. You are also given the choice of “None.” You may also choose from any appropriate User Curves stored in
Curve Numbers 21 through 35. Data points for resistor curves are detailed in Tables D-4 through D-6 in Appendix D.
Press the Input Setup key. Press the Enter key until you see the curve selection screen shown below.
Select for InputA °®
Curve 08 RX-102A-AA
Use the
s
or
t
key to cycle through the sensor curves until the desired curve is displayed. Press the Enter key, then the
Escape key to return to the normal display.
4.5.3 Thermocouple Sensor Curve Selection
The following thermocouple screens are only displayed when the Model 325 hardware is configured at the factory with
one or two thermocouple sensor inputs; being Model 325-T1 or -T2.
Once the input is setup for the thermocouple input voltage (Section 4.4.4), you may choose a temperature curve. Press
the
Input Setup key. Standard curve numbers 12 through 16 being relevant. You are also given the choice of “None.”
You may also choose from any appropriate User Curves stored in Curve Numbers 21 through 35. Data points for
thermocouple curves are detailed in Tables D-7 through D-11 in Appendix D. Press the
Enter key until you see the
curve selection screen shown below.
Select for InputA °®
Curve 16 AuFe 0.07%
Use the
s
or
t
key to cycle through the sensor curves until the desired curve is displayed. Press the Enter key, then the
Escape key to return to the normal display.
4.5.4 Filter
The reading filter applies exponential smoothing to the sensor input readings. If the filter is turned on for a sensor input,
all reading values for that input are filtered. The filter is a running average so it does not change the update rate of an
input. Filtered readings are used for displayed readings only, not for control functions.
The number of filter points determines how much smoothing is done. One filter point corresponds to one new reading on
that input. A larger number of points does more smoothing but also slows the instruments response to real changes in
temperature. The default number of filter points is 8, which settles in approximately 50 readings or 5 seconds.
The filter window is a limit for restarting the filter. If a single reading is different from the filter value by more than the
limit the instrument will assume the change was intentional and restart the filter. Filter window is set in percent of full-
scale range.
To configure a filter press the Input Setup key. The first screen appears as follows.
Select With °®
Input Setup Input A
Use the
s
or
t
key to toggle between Input A and B. Press the Enter key until the following display appears.
Select for InputA °®
Filter On