Lake Shore 350, User Manual

Page: 67 / 192

3.6.2 Heater Output Connectors 53
|
www.lakeshore.com
3.6.1.1 Output 1
Output 1 is a traditional control output for a cryogenic temperature controller. It is a
DC current source with software settable ranges and limits. It is designed for high
power (up to 75 W), providing control at higher temperatures, and fast warmup capa-
bility. Output 1 is configurable for optimization using either a 25
)
or a 50
)
heater
resistance. At the 50
)
setting, it is limited to a maximum output current of 1 A, and at
the 25
)
setting, the maximum heater output current is 1.73 A . The compliance volt-
age is 50 V minimum, but can reach as high as 58 V if the heater resistance is higher
than the nominal setting. Heater power is applied in one of five ranges. Each range is
one decade lower in power. Refer to TABLE 3-3 for maximum current and power rat-
ings into different heater resistances.
3.6.1.2 Output 2
Output 2 is also a DC current source, but is designed for low power (up to 1 W), provid-
ing stable control at very low temperatures. It is limited to a maximum output current
of 100 mA, and a compliance voltage of at least 10 V, but can be as high as approxi-
mately 13 V. Output 2 also has five ranges, each one decade lower in power than the
last. Refer to TABLE 3-3 for maximum current and power ratings into different heater
resistances.
Heater resistance
Heater Resistance
Output range
10
)
100
)
1000
)
5000
)
Range 5 100 mA 100 mW 1 W* 100 mW 20 mW
Range 4 31.6 mA 10 mW 100 mW 100 mW 20 mW
Range 3 10 mA 1 mW 10 mW 100 mW 20 mW
Range 2 3.16 mA 100 µW 1 mW 10 mW 20 mW
Range 1 1 mA 10 µW 100 µW 1 mW 5 mW
3.6.2 Heater Output
Connectors Dual banana jacks on the rear panel of the instrument are used for connecting wires
to the heater outputs. Two standard dual banana plug mating connectors are
included in the connector kit shipped with the instrument. This is a common jack, and
additional mating connectors can be purchased from local electronic suppliers, or
from Lake Shore as P/N 106-009. The heater is connected between the HI

and LO terminals.
Rear panel showing heater output connectors
TABLE 3-3
FIGURE 3-9