Lake Shore Model 330 Autotuning Temperature Controller User’s Manual
3-4
Operation
3.2.5 Display
Filter
The filter function reads 10 sequential temperature
readings over 5-seconds and displays a running average. It
quiets the display, making it more readable when the
sensor is exposed to fluctuating conditions. Filter affects
the display only and does
not
affect any other control
functions. Filter slows the display; do not use it when
ramping. To turn the filter on, press
Enter
while holding the
Input Type
key. The display to the right appears.
Once the filter display appears, continue to hold the
Input
Type
key and press the
Enter
key again to cycle the
display filter on and off. Release when the appropriate
reading appears.
3.2.6 Curve
For accurate temperature readings, select the response
curve that matches the sensor. To determine the currently
selected curve, press
Curve
. The default curve for the
Model 330-11 is Curve 10 (see Table 3-1). The display tot
the right shows both the Channel A and B Sensor using
Curve 02 - the default setting for a Model 330-11 with two
Silicon Diode Sensors.
Curves 0-10 are standard curves included with the
instrument. Curves 11-31 are user-defined curves or
Precision Option Calibrations. See Table 3-1.
To change the curve, while pressing the
Curve
key, press
the
s
key to increment the Channel A Curve number, or
the
t
key to increment the Channel B Curve number. Available curve numbers are 00 through 31. Release
when the desired curve number appears, then push the
Curve
key again. If the selected Curve number
displays, then the Curve has the correct temperature coefficient for the sensor. A different Curve number
indicates an incorrect temperature coefficient for that type sensor. The Curve number changes to the default
curve number for that type sensor.
Table 3-1. Sensor Curves
Curve No.
Number of Lines
Range (K)
Abbreviation
Description
00
01
02
03
04
05
06
07
08
09
10
11 - 31
31
31
31
31
88
31
31
31
31
31
31
_____
1 – 325
1 – 325
1 – 325
14 – 800
2 - 475
—
1.4 – 325
†
4 – 325
†
3 – 425
†
3 – 525
†
3 – 485
†
________
D
E1
DT-470
PT DIN
DT-470
*
—
AuFe07%
AuFe03%
E
K
T
_______
DT-500 DRC Curve D
DT-500 DRC Curve E1
DT-400 Series Sensors Curve 10
Platinum DIN Curve 43760
DT-400 Series Sensors Curve 10
*
Reserved
AuFe 0.07% vs. Chromel
AuFe 0.03% vs. Chromel
Type E
Type K
Type T
User-Defined Curves or Precision
Option Calibrations.
*
Increased resolution (more data points) version of Curve 10. Used by the Model 330 to generate a SoftCal Curve.
†
Values are for thermocouples with compensation. Uncompensated, the thermocouple can use the full ±15 mV range.
Sample
OFF
Control
LOC
Sample
OFF
Control
LOC