HR-33T Dew Point Microvoltmeter Instruction/Service Manual ...
HR-33T Dew Point Microvoltmeter Instruction/Service Manual ...
HR-33T Dew Point Microvoltmeter Instruction/Service Manual ...
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The FUNCTION control switch establishes appropriate interconnections among the instrument’s control andmeasuring circuits for the operational mode selected by the operator. The cooling duty cycle and instrument outputindication for each operational mode are set forth in Table 1.Table 1Instrument Operation Versus Function Switch PositionOperational Mode Cooling Duty Cycle Meter Reading NotesHEAT No cooling Not meaningful Psychrometer junctionheated to drive offmoistureINPUT SHORT No cooling Controlled by the offset Allows OFFSET to beset to zero. Protectsmeter while changingconnectionsREAD No cooling Not meaningful Microvolt output fromthe psychrometerthermocoupleCOOL 0.95 Microvolt output fromthe psychrometerthermocoupleMaximum coolingDEW POINTAutomaticallycontrolled between 0 -0.95Microvolt output fromthe psychrometerthermocoupleJunction converges todew point temperature28