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 µV + 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, kΩ, 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)
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