Lakeshore 336, Руководство пользователя

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4 c
HAPTER
1: Introduction
Model 336 Temperature Controller
1.1.4 Configurable
Display The Model 336 offers a bright, graphic liquid crystal display with an LED backlight
that simultaneously displays up to 8 readings. You can show all 4 loops, or if you need
to monitor 1 input, you can display just that one in greater detail. Or you can custom
configure each display location to suit your experiment. Data from any input can be
assigned to any of the locations, and your choice of temperature or sensor units can
be displayed. For added convenience, you can also custom label each sensor input,
eliminating the guesswork in remembering or determining the location to which a
sensor input is associated.
1.1.5 Three Option
Cards Field installable input option cards can expand your sensor selection to include sili-
con diodes (like DT-670), capacitance sensors or thermocouples. Once installed, the
option input can be selected and named from the front panel like any other input
type. These option cards further expand the application versatility of the Model 336
temperature controller by allowing specialized sensors to be switched in and out to
achieve specific measurement objectives.
For example, addition of the thermocouple input option enables continuous mea-
surement to 1000 K and above. Alternatively, the capacitance sensor option card
enables a magnetics-impervious capacitance temperature sensor to be temporarily
switched in for elimination of magneto-resistive effects while taking low tempera-
ture sample measurements under high or changing fields. The 4-channel scanner
option card enables use of additional sensors for supplemental monitoring.
1.2 Sensor
Selection Silicon diodes are the best choice for general cryogenic use from 1.4 K to above room
temperature. Diodes are economical to use because they follow a standard curve and
are interchangeable in many applications. They are not suitable for use in ionizing
radiation or magnetic fields.
Cernox™ thin-film RTDs offer high sensitivity and low magnetic field-induced errors
over the 0.3 K to 420 K temperature range. Cernox sensors require calibration.
Platinum RTDs offer high uniform sensitivity from 30 K to over 800 K. With excellent
reproducibility, they are useful as thermometry standards. They follow a standard
curveabove 70 K and are interchangeable in many applications.
FIGURE
1-3 Displays showing four loop mode, input display mode and custom display mode