Sensor Input Configuration; Thermometry - Lakeshore 336 User Manual

8 c 1: Introduction
HAPTER
Sensor
Input Range
Thermocouple
Tempera-
option
ture Coeffi-
Model 3060
cient
Thermocouple Positive
3060
13 Control stability of the electronics only, in ideal thermal system
Sensor
Input Range
Capacitance
Tempera-
option
ture Coeffi-
Model 3061
cient
Capacitance Positive or 0.1 nF to 15 nF
3061 negative
1 nF to 150 nF
14 Control stability of the electronics only, in ideal thermal system
1.3.2 Sensor Input
Configuration

1.3.3 Thermometry

Model 336 Temperature Controller
Excitation
Current
±50 mV NA
TABLE 1-4 Thermocouple option input specifications
Excitation
Current
3.496 kHz 1 mA
square wave
3.496 kHz 10 mA
square wave
TABLE 1-5 Capacitance option input specifications
Measurement
type
Excitation
Supported sensors
Standard curves
Input connector
Number of inputs
Input configuration
Supported option cards
Option slots
Isolation
A/D resolution
Input accuracy
Measurement resolution
Maximum update rate
Maximum update rate (scanner)
Autorange
User curves
SoftCal™
Math
Filter
Display Measurement
Resolution Resolution
0.1 µV 0.4µV
Display Measurement
Resolution Resolution
0.1 pF 0.05 pF
1 pF 0.5 pF
Diode/RTD
4-lead differential
Constant current with
current reversal for RTDs
Diodes: Silicon, GaAlAs
RTDs: 100 ) Platinum (option), 1000 ) Plat-
inum, Germanium,
Carbon-Glass, Cernox™, and Rox™
DT-470, DT-670, DT-500-D, DT-500-E1,
PT-100, PT-1000, RX-102A, RX-202A
6-pin DIN
TABLE 1-6 Sensor input configuration
4 (8 with Model 3062)
Inputs can be configured from the front panel to accept any of the
supported input types. Thermocouple and capacitance inputs require
an optional input card that can be installed in the field.
Thermocouple (3060), capacitance (3061), or scanner (3062)
1
Sensor inputs optically isolated from other circuits but not each other
24-bit
Sensor dependent, refer to Input Specifications table
Sensor dependent, refer to Input Specifications table
10 rdg/s on each input, 5 rdg/s when configured as 100 k) NTC RTD
with reversal on
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
Automatically selects appropriate NTC RTD or PTC RTD range
Room for 39 200-point CalCurves™ or user curves
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
Maximum and minimum
Averages 2 to 64 input readings
Electronic Measurement Temperature
Accuracy Coefficient
(at 25 °C)
±1 µV ±0.05% (0.1 µV + 0.001% of rdg)/°C
of rdg 12
Electronic Measurement Temperature
Accuracy Coefficient
(at 25 °C)
±50 pF ±0.1% 2.5 pF/°C
of rdg
±50 pF ±0.1% 5 pF/°C
of rdg
Thermocouple
2-lead differential, room
temperature compensated
NA
Most thermocouple types
Type E, Type K, Type T, AuFe
0.07% vs. Cr, AuFe 0.03% vs. CR
Screw terminals in a ceramic
isothermal block
Electronic
Control
Stability 13
±0.8µV
Electronic
Control
Stability 14
0.1 pF
1 pF