Lakeshore 325, Руководство пользователя, Страница: 19 / 166

Lake Shore Model 325 Temperature Controller User’s Manual
Introduction 1-7
Specifications (Continued)
Control
Control loops 2
Control type Closed loop digital PID with manual heater output or open loop
Tuning Autotune (one loop at a time), PID, PID zones
Control stability Sensor dependent, refer to Input Specifications table
PID control settings:
P roportional (Gain) 0 to 1000 with 0.1 setting resolution
I ntegral (Reset) 1 to 1000 (1000/s) with 0.1 setting resolution
D erivative (Rate) 1 to 200% with 1% resolution
Manual output 0 to 100% with 0.01% setting resolution
Zone control 10 temperature zones with P, I, D, manual heater out, and heater range
Setpoint ramping 0.1 K/min to 100 K/min
Loop 1 Heater Output
Type Variable DC current source
D/A resolution 16-bit
25

Setting 50

Setting
Max power 25 W 25 W
Max current 1 A 0.71 A
Voltage compliance (min) 25 V 35.4 V
Heater load range
20

to 25

40

to 50

Heater load for max power
25

50

Ranges 2 (2.5 W/25 W)
Heater noise (<1 kHz) 1 µA + 0.01% of output
Grounding Output referenced to chassis ground
Heater connector Dual banana
Safety limits Curve temperature, power up heater off, short circuit protection
Loop 2 Heater Output
Type Variable DC voltage source
D/A resolution 16-bit
25

Setting 50

Setting
Max power 1 W 2 W
Max voltage 5 V 10 V
Current compliance (min) 0.2 A 0.2 A
Heater load range

25
 
50

Heater load for max power
25

50

Ranges 1
Heater noise (<1 kHz) 50 µV + 0.01% of output
Grounding Output referenced to chassis ground
Heater connector Detachable terminal block
Safety limits Curve temperature, power up heater off, short circuit protection
Front Panel
Display Before Q4, 2013: 2-line

20-character liquid crystal display with 5.5 mm high characters;
After Q4, 2013: 2-line × 20-character, OLED display with 5.5 mm high characters
Number of reading displays 1 to 4
Display units K, °C, V, mV,

Reading source Temperature, sensor units
Display update rate 2 rdg/s
Temperature display resolution 0.001° from 0° to 99.999°, 0.01° from 100° to 999.99°, 0.1° above 1000°
Sensor units display resolution Sensor dependent, to 5 digits
Other displays Setpoint, heater range and heater output (user selected)
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
Heater output resolution 1%
Display annunciators Control Input, Remote, Autotune
Keypad 20-key membrane, numeric and specific functions
Front panel features Front panel curve entry, keypad lock-out