Lakeshore 325, Руководство пользователя, Страница: 78 / 166

Lake Shore Model 325 Temperature Controller User’s Manual
5-2 Advanced Operation
Table 5-1. Curve Header Parameters
Name:
The curve name cannot be changed from the front panel. Curve names can only be entered over the
computer interface (up to 15 characters). The default curve name is User xx, where xx is the curve
number.
Serial Num:
Identify specific sensors with serial numbers of up to 10 characters. The serial number field accepts
both numbers and letters, but the instrument front panel enters only numbers. To enter both numbers
and letters, enter curves over computer interface. The default is blank.
Curve
Format:
The instrument must know the data format of the curve breakpoints. Different sensor types use
different data formats. The sensor inputs require one of the formats below. The range and resolution
specified are not always available at the same time. Practical range and resolution depend on the
sensor type.
Sensor Units Sensor Units
Format Description Full Scale Range Maximum Resolution
V/K Volts vs. kelvin 10 (V) 0.00001 (V)

/K Resistance vs. kelvin 10 K (

) 0.001 (

)
log

/K Log resistance vs. kelvin 4 (log

) 0.00001 (log

)
mV/K Millivolts vs. kelvin ±100 (mV) 0.0001 (mV)
SP Limit
A setpoint temperature limit can be included with every curve. When controlling in temperature, the
setpoint cannot exceed the limit entered with the curve for the control sensor. The default is 375 K.
Set to 9999 K if no limit is required.
Coeff:
The instrument derives the temperature coefficient from the first two breakpoints. If it is set
improperly, check the first two breakpoints. A positive coefficient indicates the sensor signal
increases with increasing temperature. A negative coefficient indicates the sensor signal decreases
with increasing temperature.
Table 5-2. Recommended Curve Parameters
Type
Typical Lake
Shore Model
Units Format
Limit
(K)
Coefficient
Recommended Sensor
Resolution
Silicon Diode DT-470 V V/K 475 Negative 0.00001 (V)
GaAlAs Diode TG-120 V V/K 325 Negative 0.00001 (V)
Platinum 100 PT-100
 
/K
800 Positive 0.001 (

)
Platinum 1000 PT-100


/K 800 Positive 0.01 (

)
Rhodium-Iron RF-100


/K 325 Positive 0.001 (

)
Carbon-Glass CGR-1-1000

log

/K 325 Negative 0.00001 (log

)
Cernox™
CX-1030

log

/K 325 Negative 0.00001 (log

)
Germanium GR-200A-100

log

/K
325 Negative
0.00001 (log

)
Rox™
RX-102A

log

/K
40 Negative
0.00001 (log

)
Type K 9006-005 mV mV/K 1500 Positive 0.0001 (mV)
Type E 9006-003 mV mV/K 930 Positive 0.0001 (mV)
Type T 9006-007 mV mV/K 673 Positive 0.0001 (mV)
Au-Fe 0.03% No Longer Sold mV mV/K 500 Positive 0.0001 (mV)
Au-Fe 0.07% 9006-001 mV mV/K 610 Positive 0.0001 (mV)