Lake Shore 350, User Manual

Page: 86 / 192

72 c
HAPTER
4: Operation
Model 350 Temperature Controller
During normal operation, only the curves that share the input type you have selected
are displayed. If the curve you wish to select does not appear in the selection
sequence make sure the curve format matches the recommended format for the
input type selected. Refer to TABLE 4-7.
The sensor reading of the instrument can always be displayed in sensor units. If a tem-
perature response curve is selected for an input, its readings may also be displayed in
temperature.
Sensor curves
Curve
Number
Curve Name Sensor Type Model Number Temperature Range** For Data Points, Refer To:
01 DT-470 Diode DT-470 1.4 - 475 K Table D-1
02 DT-670 Diode DT-670 1.4 - 500 K Table D-2
03 DT-500-D* Diode DT-500-D 1.4 - 365 K Table D-3
04 DT-500-E1* Diode DT-500-E1 1.1 - 330 K Table D-3
05 Reserved — — — —
06 PT-100 PTC RTD PT-100 30 - 800 K Table D-4
07 PT-1000* PTC RTD PT-1000 30 - 800 K Table D-4
08 RX-102A-AA NTC RTD Rox RX-102A 0.05 - 40 K Table D-5
09 RX-202A-AA NTC RTD Rox RX-202A 0.05 - 40 K Table D-6
10 Reserved — — — —
11 Reserved — — — —
12 Type K Thermocouple Type K 3 - 1645 K Table D-7
13 Type E Thermocouple Type E 3 - 1274 K Table D-8
14 Type T Thermocouple Type T 3 - 670 K Table D-9
15 AuFe 0.03%* Thermocouple AuFe 0.03%* 3.5 - 500 K Table D-10
16 AuFe 0.07% Thermocouple AuFe 0.07% 3.15 - 610 K Table D-11
17 Reserved — — — —
18 Reserved — — — —
19 Reserved — — — —
20 Reserved — — — —
21 - 59 User Curves — — — —
*No longer offered by Lake Shore
**Instrument may not support the sensor over its entire range
Once the input is configured (section 4.4), you may choose a temperature curve. Any
standard or user curve that matches the format of the sensor type configured for a
given input will be available under the Curve parameter in the Input Setup menu for
that input. You are also given the choice of None. When set to None, front panel read-
ings configured for kelvin or Celsius will display the NOCURV message and the inter-
face will report 0 K and –273.15 °C for KRDG and CRDG queries, respectively. Data
points for standard curves are detailed in Appendix C.
Menu Navigation:
Input Setup
Q
Input (A, B, C or D)
Q
Curve
Q
(Any curve of matching type)
4.4.9 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 not used for control functions but they are used for all input features
including Max/Min.
The number of filter points determines filter bandwidth. 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 to within six time constants of a step
change value in 45 readings, or 4.5 s.
TABLE 4-11