Lake Shore 335, User Manual

Page: 90 / 170

78 c
HAPTER
5: Advanced Operation
Model 335 Temperature Controller
Breakpoint setting resolution is six digits in temperature. Most temperature values
are entered with 0.001 resolution. Temperature values of 1000 K and greater can be
entered to 0.01 resolution. Temperature values below 10 K can be entered with
0.00001 resolution. Temperature range for curve entry is 0K to 9999.99 K.
Typical curve parameters
Sensor type
Typical Lake Shore
model
Format Limit (K)
Temperature
coefficient
Typical sensor
resolution
Silicon Diode DT-670 V/K 475 Negative 0.00001 V
GaAlAs Diode TG-120 V/K 325 Negative 0.00001 V
Platinum 100 PT-100
)
/K 800 Positive 0.001
)
Platinum 1000 —*
)
/K 800 Positive 0.01
)
Rhodium-Iron RF-800
)
/K 325 Positive 0.001
)
Carbon-Glass CGR-1-1000 log
)
/K 325 Negative 0.00001 log
)
Cernox™ CX-1050 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/K 1500 Positive 0.0001 mV
Type E 9006-003 mV/K 930 Positive 0.0001 mV
Type T 9006-007 mV/K 673 Positive 0.0001 mV
Au-Fe 0.03% —* mV/K 500 Positive 0.0001 mV
Au-Fe 0.07% 9006-001 mV/K 610 Positive 0.0001 (mV)
*Not offered by Lake Shore
Setting resolution is also six digits in sensor units. The curve format parameter
defines the range and resolution in sensor units as shown in TABLE 5-3. The sensor
type determines the practical setting resolution. TABLE 5-4 lists recommended sen-
sor units resolutions.
The breakpoints should be entered with the sensor units value increasing as point
number increases. There should not be any breakpoint locations left blank in the mid-
dle of a curve. The search routine in the Model 335 interprets a blank breakpoint as
the end of the curve.
5.9 Front Panel
Curve Entry
Operations There are four operations associated with front panel curve entry: Edit Curve, Erase
Curve, Copy Curve, and SoftCal, as detailed in TABLE 5-5.
Front panel curve entry operations
Operation Description Refer to section:
Edit Curve
Edit allows the user to view any curve and enter or edit a curve at any
user curve location. Standard curves cannot be changed.
5.9.1
Erase Curve
Erase allows the user to delete a curve from any user curve location.
Standard curves cannot be erased.
5.9.2
Copy Curve
Copy allows the user to copy a curve from any location to any user
curve location. Curves cannot be copied into standard curve locations.
5.9.3
SoftCal
Allows creation of a new temperature curve from a standard curve and
known data points entered by the user.
5.10
Menu Navigation:
Curve Entry
Q
(Edit, Erase, Copy, SoftCal)
5.9.1 Edit Curve The Edit Curve operation is used to enter a new curve or edit an existing user curve.
Only user curves (21 to 59) can be edited. Entering the identification parameters
associated with the curve is as important as entering the breakpoints. Curve header
parameters are listed in TABLE 5-3. Typical curve parameters for common sensors are
listed in TABLE 5-4. Read this section completely and gather all necessary data before
beginning the process.
TABLE 5-4
TABLE 5-5