CI Systems
SR-800R
2.2 Blackbodies
Overview
Two types of Blackbodies are available:
2.2.1
Absolute Mode Blackbodies
The Absolute Mode BB (Blackbody) consists of an emitter plate, which is
thermoelectrically heated or cooled to a pre-defined absolute temperature.
One PRT (Platinum Resistance Thermometer) is mounted in the emitter and is used
by the controller to measure the emitter temperature.
The efficiency of the thermoelectric modules is ensured by a heat sink and a fan.
The emitter plate is painted with an high-emissivity paint.
The BB fan is also controlled by the controller. The fan operates mainly to maintain
emitter temperatures lower than the ambient temperature, or when cooling down.
2.2.2
Differential Mode Blackbodies
The Differential Mode BB consists of an emitter plate, which is thermoelectrically
heated or cooled with respect to the target temperature (thus, the differential
temperature between the Emitter and the target is controlled). The target plate is
mounted in front of the emitter surface. The efficiency of the thermoelectric modules
is ensured by a heat sink and a fan.
Mounted in the emitter and target plates are two PRT sensors, used by the controller
to measure their temperature difference. The target is clamped to the target holder
with captive screws and can be easily replaced. The motorized target-wheel (RAD)
option can also be used.
Both the emitter and the target plates are painted with a highly emissive paint.
The Differential Mode BB can also be operated in the Absolute Mode. Nevertheless,
the operator must not disconnect the target sensors, as they provide the target
temperature to the controller. The controller uses the target temperature as an
indicator of the ambient temperature required controlling the Blackbody fan
operation.
NOTE
The temperature range of Differential Mode blackbodies are
limited to the Absolute Mode temperature range.
605-7040
Operation
Manual
Rev D
2-3
June 2013
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Summary of Contents for ControlMaster SR-800R
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