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
SECTION 6 – MAINTENANCE6.1 – General MaintenanceThe instrument is constructed using solid state circuitry and high quality components throughout. There is norequirement for general periodic maintenance other than battery replacement in the 5103A power supply module.As with any precision equipment, reasonable care should be exercised to protect the instrument from severemechanical shock or from extremes in temperature. The instrument panel and case may be cleaned using a softcloth and mild soap solution, if necessary.6.2 – BatteriesThe HR-33T with the 5103A battery pack uses four Eveready alkaline type 522 (or equivalent) storage batteries.They are connected in series to provide +18, &18, and zero volt connections to power the instrument. Thebatteries are mounted in the power supply module which is removed from the instrument by rotating the fastenersand lifting straight up.The battery voltage can be tested at any time by moving the RANGE switch to +BATT or &BATT. The readingwill be in volts with full scale = 30 volts. Two batteries are read at one time to give nominal readings of plus orminus 18 volts respectively. Batteries should be replaced anytime the voltage reading falls below 16 volts.CAUTIONRemove used batteries promptly to avoid the danger of instrument damage by corrosive leakage.In no event should the instrument be stored for extended periods without first removing the batteries.The useful operating battery life is theoretically 10 hours, but actual service may vary substantiallyfrom this depending upon operating condition and freshness of the batteries when placed in service.The HR-33T-R with the 5112 rechargeable battery pack uses 30 nickel cadmium batteries in a case which isinterchangeable with the 5103A battery pack. A charger is supplied with the 5112 battery pack. The chargersupplies 25 mA current to the batteries. A discharged battery can be completely recharged in 14 to 16 hours. Thecharger should not be left connected to the power supply for longer than two days or the batteries may deteriorateand become inoperative. A fully charged power supply will provide approximately 20 hours of operation.29
Page 1 and 2: HR-33T Dew Point MicrovoltmeterInst
Page 3: CONTENTSSECTION 1 - INSTRUMENT SPEC
Page 7: SECTION 1 - INSTRUMENT SPECIFICATIO
Page 11 and 12: A v SET control. The numerical valu
Page 13 and 14: Output For Dew Point, Psychrometric
Page 15 and 16: 11Temperature Correction CurveFigur
Page 17 and 18: SECTION 3 - ADDITIONAL OPERATING IN
Page 19 and 20: 3.3 - Effect of Zero Drift on Readi
Page 21 and 22: SECTION 4 - THEORY OF OPERATION4.1
Page 23 and 24: 4.2 - Psychrometric MethodThermocou
Page 25 and 26: Heat transfer due to Peltier coolin
Page 27 and 28: 23Theoretical vs. Actual Instrument
Page 29 and 30: SECTION 5 - ELECTRONICSThe electron
Page 31: 27Typical Control and Signal Wavefo
Page 35 and 36: SECTION 7 - TROUBLESHOOTINGIf the i
Page 37 and 38: Output Characteristics for Contamin
Page 39 and 40: HR-33T Schematic DiagramFigure 835
Page 41 and 42: Test Point LocationsFigure 1037
Page 43 and 44: Front Panel AssemblyFigure 1239
Page 45 and 46: SECTION 8 - PARTS LIST5106 - 110 Vo
Page 47 and 48: Front PanelRef. No. Part No. Qty. U
Page 49: 5112 Battery PackRef. No. Part No.

HR-33T Dew Point Microvoltmeter Instruction/Service Manual ...

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