Lakeshore 325, Руководство пользователя, Страница: 18 / 166

Lake Shore Model 325 Temperature Controller User’s Manual
1-6 Introduction
1.2 SPECIFICATIONS
Input Specifications
Sensor
Temperature
Coefficient
Input
Range
Excitation
Current
Display
Resolution
Measurement
Resolution
Electronic
Accuracy
(at 25 °C)
Measurement
Temperature
Coefficient
Electronic
Control
Stability
1
Diode
Negative 0 V to 2.5 V 10 µA ±0.05%
2,3
100 µV 0.4 µV
±80 µV
±0.005% of rdg (10 µV +
0.0005% of rdg)/°C
±20 µV
Negative 0 V to 7.5 V 10 µA ±0.05%
2,3
100 µV 10 µV
±320 µV
±0.01% of rdg
(20 µV +
0.0005% of rdg)/°C
±40 µV
PTC RTD
Positive 0  to 500  1 mA
4
10 m  2 m 
±0.004

±0.01% of rdg
(0.2 m

+
0.0005% of rdg)/°C
±4 m 
Positive
0

to 5000
 1 mA
4 100 m

20 m

±0.04

±0.02% of rdg
(0.2 m

+
0.0005% of rdg)/°C
±40 m

NTC RTD Negative
0

to 7500
 10 µA ±0.05%
100 m

40 m

±0.1

±0.04% of rdg
(2 m

+
0.0005% of rdg)/°C
±80 m

Thermocouple
Positive ±25 mV NA 1 µV 0.4 µV
±1 µV
±0.05% of rdg
(0.2 µV +
0.0015% of rdg)/°C
±0.8 µV
Positive ±50 mV NA 1 µV 20 µV
±1 µV
±0.05% of rdg
(0.2 µV +
0.0015% of rdg)/°C
±0.8 µV
1
Control stability of the electronics only, in ideal thermal system
2
Current source error has negligible effect on measurement accuracy
3
Diode input excitation can be set to 1 mA
4
Current source error is removed during calibration
5
Accuracy specification does not include errors from room temperature compensation
Thermometry
Number of inputs 2
Input configuration Each input is factory configured for either diode / RTD or thermocouple
Isolation Sensor inputs optically isolated from other circuits but not each other
A/D resolution 24-bit
Input accuracy Sensor dependent, refer to Input Specifications table
Measurement resolution Sensor dependent, refer to Input Specifications table
Max update rate: 10 rdg/s on each input, (except 5 rdg/s on input A when configured as thermocouple)
User curves Room for 15, 200 point CalCurves
™
or user curves
SoftCal
™
Improves accuracy of DT-470 diode to ±0.25 K from 30 K to 375 K. Improves accuracy
of platinum RTDs to ±0.25 K from 70 K to 325 K. Stored as user curves.
Filter Averages 2 to 64 input readings
Sensor Input Configuration
Diode/RTD Thermocouple
Measurement type 4-lead differential 2-lead, room temperature compensated
Excitation
Constant current with current reversal for
RTDs
NA
Supported sensors
Diodes: Silicon, GaAlAs RTDs: 100

Platinum, 1000

Platinum, Germanium,
Carbon-Glass, Cernox, and Rox
Most thermocouple types
Standard curves
DT-470, DT-500D. DT-670, PT-100, PT-1000,
RX-102A, RX-202A Type E, Type K, Type T, AuFe 0.07% vs. Cr,
AuFe 0.03% vs Cr
Input connector 6-pin DIN Ceramic isothermal block