Lake Shore Model 340 Temperature Controller User’s Manual
Introduction
1-1
CHAPTER 1
INTRODUCTION
1.0 GENERAL
This chapter provides an introduction to the Model 340 Temperature Controller. The Model 340 was
designed and manufactured in the United States of America by Lake Shore Cryotronics, Inc. The Lake Shore
Model 340 is our most advanced temperature controller to date. It is a result of 25 years of experience in the
cryogenics industry and reflects our dedication to customer service. Combined with the complete line of Lake
Shore temperature sensors, the Model 340 is one of the most useful and flexible tools available for cryogenic
temperature measurement and control.
Many features requested by our users are included without the need for additional plug-in circuitry. Every
effort was made to make these features available for automatic instrument control, manual control, or
computer control. This ensures that the Model 340 can work effectively in any experimental environment. The
Model 340 has the best display capability and provides the most operator feedback of any Lake Shore
instrument. The Model 340 has also not lost sight of its primary functions: accurate temperature measurement
and stable temperature control.
If you have just received your new Model 340, please read Chapters 2 thru 4 completely before attempting to
setup and use the instrument. Chapter 2 contains cooling system design and setup considerations. Chapter 3
contains instrument hardware setup instructions. Chapter 4 contains initial instrument startup and setup
instructions. Input sensor reading operation is described in Chapter 5. Temperature control operation is
described in Chapter 6. Analog and digital I/O operation is described in Chapter 7. Instrument programming is
provided in Chapter 8. Remote interface operation (IEEE-488 and Serial) is covered in Chapter 9. Service is
provided in Chapter 10. Options and accessories are detailed in Chapter 10. Finally, various curve tables are
provided in Appendix A.
We welcome your comments concerning this manual. Although every effort has been made to keep it free
from errors, some may occur. When reporting a specific problem, please describe it briefly and include the
applicable paragraph, figure, table, and page number. Send comments to Lake Shore Cryotronics, Attn:
Technical Publications, 575 McCorkle Blvd, Westerville, Ohio 43082-8888. The material in this manual is
subject to change without notice.
Due to the Lake Shore commitment to continuous product improvement, it is reasonable to expect that
modifications will be made in the Model 340 software with time. Some of these changes are the result of
Customer feedback regarding operation on various cryogenic systems. We encourage you to contact us with
any observations or suggestions which you have regarding the use of this controller. Also, please return your
warranty card to ensure that any software updates are sent to you.
340 Temperature Controller
Loop 2
Program
Loop 1
Setpoint
Zone
Settings
Control
Channel
Auto
Tune
Ramp
Control
Setup
Manual
Output
P
I
D
Heater
Of f
+/-
Save
Screen
Help
DataCard
Local
Cancel
Screen
More
Input
Setup
Display
Format
SoftCal
Escape
Scan
Setup
Interface
Alarm
Reset
Math
Reset
Options
Enter
Analog
Outputs
Alarm
Setup
Math
Setup
7
8
9
4
5
6
1
2
3
0
.
+/-
Curve
Entry
Previous
Setting
Next
Setting
Heater
Range
LakeShore
340-1-1.eps
Figure 1-1. Model 340 Front Panel