User`s manual

1.1 Product Des c r i p t i o n 1
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Chapter 1: Introduction
Model 335 front view
1.1 Product
Description
Features:
D O
perates down to 300 mK with appropriate NTC RTD sensors
D T
wo sensor inputs
D T
wo configurable PID control loops providing 50 W and 25 W or 75 W and 1 W
D Au
totuning automatically calculates PID parameters
D Au
tomatically switch sensor inputs using zones to allow continuous measure-
ment and control from 300 mK to 1505 K
D Cus
tom display setup allows you to label each sensor input
D USB and IEEE-488 interfaces
D Supp
orts diode, RTD, and thermocouple temperature sensors
D Sensor ex
citation current reversal eliminates thermal EMF errors for 
resistance sensors
D
±10 V analog voltage outputs, alarms, and relays
Designed with the user and ease of use in mind, the M
odel 335 temperature control-
ler offers many user-configurable features and adv
anced functions that until now
have been reserved for more expensive, high-end temperature controllers. The
Model 335 is the first two-channel temperature controller av
ailable with user 
configurable heater outputs delivering a total of 75 W of low noise heater power: 
50 W and 25 W, or 75 W and 1 W. With that much heater power packed into an afford-
able half-rack sized instrument, the Model 335 gives you more power and control
than ev
er.
Control outputs are equipped wi
th both hardware and software features allowing
you, and not your temperature controller, to easily control your experiments. Output
one functions as a current output while output two can be configured in either cur-
rent or voltage mode. With output two in voltage mode, it functions as a ±10 V analog
out
put while still providing 1 W of heater power and full closed loop proportional-
integral-derivative (PID) control capability. Alarms and relays are included to help
automate secondary control functions. The improved autotuning feature of the
Model 335 can be used to automatically calculate PID control parameters, so you
spend less time tuning your controller and more time conducting experiments.
FIGURE 1-1