Lake Shore Model 340 Temperature Controller User’s Manual
Introduction
1-7
Thermometry:
Number of Inputs:
Two included, more optional
Measurement Type:
Four-lead Differential
Standard Sensor Inputs:
Silicon Diode, GaAIAs Diode, Platinum RTD, Cernox RTD, Germanium RTD,
Carbon-Glass RTD, Ruthenium Oxide, Rhodium Iron, other resistive sensors
Optional Sensor Inputs:
Thermocouple, Capacitance
Input Accuracy:
Sensor Dependent. Refer to Table 1-2
A/D Resolution:
24-bit Analog-to-Digital
Update Rate:
Up to 20 readings/second on an input, 40 readings/second on all inputs
Standard Curves
11 standard curves
User Curve Storage:
Forty 200-point CalCurves or user curves
SoftCal:
Improves accuracy of DT-470 diode or platinum RTD sensors.
Math:
Maximum and Minimum of input readings and linear equation.
Filter:
Averages input readings to quiet display, settable time constant,
can average from 2 to 64 input readings
Control:
Control Loops:
Two
Control Type:
Digital PID with Manual output
Control Stability:
Sensor Dependent, refer to Table 1-2
Heater Output (Loop 1 Only):
Heater Output Type:
Variable DC current source
Heater Output Resolution:
18-bit Digital-to-Analog converter
Max. Heater Power:
100 W (2 A into 25
Ω
load)
Max. Heater Output Current:
2 A
Current Limit Settings:
2 A, 1 A, 0.5 A, 0.25 A
Heater Output Compliance:
50 V
Heater Output Ranges:
Five in decade steps of power
Heater Load Type:
Resistive
Heater Load Range:
10
Ω
to 100
Ω,
25
Ω
for max heater power
Heater Noise:
50
µ
V + 0.001% of output voltage
PID Control Settings:
Gain (Proportional):
0-1000 with 0.1 setting resolution
Reset (Integral):
1-1000 with 0.1 setting resolution
Rate (Derivative):
1-1000 seconds with 1 second resolution
Manual Output:
0-100% with 0.01% setting resolution
Zone Control Mode:
10 temperature zones with control parameters
Setpoint Ramping:
0.1
–
100 K/minute
Internal Program:
100 program steps
Front Panel:
Display Type
Graphic LCD with fluorescent backlight
Number of Input Displays:
One to eight
Display Units:
Temperature in K, °C, or sensor units V, mV,
Ω
, k
Ω
, nF
Display Resolution Input Temp: 0.0001 K below 10 K, 0.001 K above 10 K
Display Resolution Sensor Units: Sensor dependent, to six digits
Setpoint Setting Resolution:
Same as display resolution (actual resolution is sensor dependent)
Heater Output Display:
Numeric display in percent of full scale for power or current. Bar graph display of Heater
Output available.
Keypad:
Numeric plus special function
Curve Entry:
Front panel curve entry
Interfaces:
IEEE-488.2 Interface:
SH1, AH1, T5, L4, SR1, RL1, PP0, DC1, DT0, C0, E1
Serial Interface:
RS-232C electrical format, 19,200 baud, RJ-11 connector
Analog outputs:
Temperature monitor or Loop 2 control output
Number: Two
Voltage Range:
±10 volts
Resolution: 1.25
mV
Maximum Current:
0.1 amperes
Minimum Load:
100
Ω
Alarm Type:
High and low alarm for each input
Alarm Actuators:
Audible beeper or relays
Relays:
Number: Two
Contacts Available:
Normally open (N.O.), normally closed (N.C.), and common (C)
Contact Rating:
30 VDC at 2 A
Digital I/O:
5 inputs and 5 outputs. TTL voltage level compatible
Data Card:
PC card Type II slot used for curve transfer, setup storage, and data logging
General:
Ambient Temperature Range:
20
–
30 °C (68
–
86 °F) for specified accuracy; 15
–
35 °C (59
–
95 °F) for reduced accuracy
Power Requirements:
100, 120, 220, 240 VAC (+5%, –10%), 50 or 60 Hz; 190 VA
Enclosure Type:
Full 19-inch Rack Mount
Size:
432 mm × 89 mm × 381 mm (17 × 3.5 × 15 inches)
Weight:
8 kilograms (17.6 pounds)