Lake Shore 350, User Manual

Page: 22 / 192

8 c
HAPTER
1: Introduction
Model 350 Temperature Controller
1.6.2 Sensor Input
Configuration
Sensor input configuration
RTD
Diode
(option)
Thermocouple
(option)
Capacitance
(option)
Measure-
ment type
4-lead differential
4-lead dif-
ferential
2-lead differential,
room temperature
compensated
4-lead differential,
variable duty cycle
Excitation
Constant current with
current reversal
10 µA
constant
current
N/A
Constant current,
3.496 kHz square
wave
Supported
sensors
100
)
Platinum (option), 1000
)
Platinum (option), Germa-
nium, Carbon-Glass, Cernox™,
and Rox™
Silicon,
GaAlAs
Most thermocouple
types
CS-501 GR
Standard
curves
DT-470,
DT-670,
DT-500-D
DT-500-E1
PT-100
PT-1000
RX-102A
RX-202A
DT-470,
DT-670,
DT-500-D,
DT-500-E1
Type E, Type K, Type T,
AuFe 0.07% vs. Cr,
AuFe 0.03% vs. CR N/A
Input

connector
6-pin DIN 6-pin DIN
Screw terminals in a
ceramic
isothermal block
6-pin DIN
1.6.3 Thermometry
Number of inputs 4 (8 with the Model 3062)
Input configuration Inputs can be configured from the front panel to accept any of the supported
input types. Thermocouple, capacitance and diode inputs require an optional
input card that can be installed in the field. Once installed, the additional inputs
can be selected from the front panel like any other input type.
Supported option cards Thermocouple (3060), capacitance (3061), or scanner (3062)
Option slots 1
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
Maximum update rate 10 rdg/s on each non-scanned input
Maximum update rate (scanner) The maximum update rate for a scanned input is 10 rdg/s distributed among the
enabled channels. Any channel configured as 100 k
)
RTD with reversal on
changes the update rate for the channel to 5 rdg/s
Autorange Automatically selects appropriate NTC RTD or PTC RTD range
User curves Room for 39 200-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
Math Maximum and minimum
Filter Averages 2 to 64 input readings
Excitation frequency 10 Hz squarewave
TABLE 1-4