User`s manual

5 . 1 1 . 6 Hardware Differences 87
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5.11.6 Hardware
Differences
One of the most significant hardware differences between the Model 335, Model 331
and Model 332 is the Loop 2, or Output 2, control output. The Model 331 provides a
±10 V voltage source output with 100 mA maximum current, providing 1 W into a
100 ) heater. The Model 332 provides a ±10 V voltage source output with 1 A maxi-
mum current, providing up to 10 W into a 10 ) heater
. The Model 335 provides both a
±10 V voltage source with 100 mA maximum current, which is the exact same hard-
ware as the Model 331, and a +1 A current source, w
hich can be used to emulate the
Loop 2 output of the Model 332 into a 10 ) heater (TABLE 5-9 provides a summary of
these differences).
Output 2 hardware comparisons between Models 331, 332, and 335
Controller Output 2 type Voltage source output Maximum current Power
331 Emulation Mode
Model 331 Voltage ±10 V 100 mA 1 W into 100 )
Model 335 Voltage ±10 V 100 mA
1 W into 100 )
332 Emulation Mode
Model 332 Voltage ±10 V 1 A 10 W into 10 )
Model 335 Current +35.4 V 1 A (configurable) 10 W into 10 )
For Output 2 of the Model 335, the factory default Output Type setting is Current, but
either output type can be used in any emulation mode. Therefore when setting the
emulation mode from the front panel, the user is also prompted to set the Output
Type for Output 2. In most cases the Voltage setting is more appropriate for
Model 331 emulation, and the Current setting is more appropriate for Model 332
emulation, but the user must determine the appropriate setting for the given system.
The Output 2 current source is NOT limited to +10 V, and is capable of providing more than
25 W of power, depending on the heater resistance. When using the current source for
Output 2, ensure that the power rating of the attached heater will not be exceeded given
the maximum current of 1 A. See
section 2.5.1 for information on limiting the maximum
current for the current source out
puts, which can be used to limit the amount of power
into the attached heater.
The Current and Voltage outputs use separate physical rear panel connections. See 
section 4.5.1 for information on the Output Type setting.
Menu Navigation:
Interface
ENTER
QEmulation Mode (None, Model 331, Model 332)
Interface Command: EMU
L
5.11.7 Emulation Mode
Differences
The only difference between the Model 331 Emulation mode and the Model 332
Emulation mode is in the interpretation of the INTYPE command. The Model 332
Emulation mode interprets Sensor Type parameter settings of 8 through 12 as the
NTC RTD ranges that are exclusive to the Model 332. The Model 331 Emulation mode
interprets Sensor Type parameter settings of 8 and 9 as the alternate 1mA Diode cur-
rent excitation range.
TABLE 5-9