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

CONTENTSSECTION 1 – INSTRUMENT SPECIFICATIONS ............................................3SECTION 2 – BASIC OPERATING PROCEDURE ...........................................52.1 – Dew Point Mode ...........................................................52.2 – Psychrometric Mode ........................................................62.3 – Combined Dew Point and Psychrometric Mode ....................................62.4 – Temperature Measurements ...................................................8SECTION 3 – ADDITIONAL OPERATING INFORMATION ..................................113.1 – A v Set Adjustment .........................................................113.2 – Thermal and Vapor Equilibration .............................................123.3 – Effect of Zero Drift on Reading ...............................................133.4 – Ancillary Instrument Functions ...............................................133.5 – A v Versus Temperature .....................................................13SECTION 4 – THEORY OF OPERATION .................................................154.1 – Thermocouple Cooling Coefficient ............................................154.2 – Psychrometric Method ......................................................174.3 – Dew Point Method .........................................................174.4 – HR-33T Dew Point System ...................................................184.5 – Effect of Ambient Temperature ...............................................20SECTION 5 – ELECTRONICS ..........................................................23SECTION 6 – MAINTENANCE .........................................................276.1 – General Maintenance ......................................................276.2 – Batteries ................................................................27SECTION 7 – TROUBLESHOOTING ....................................................29SECTION 8 – PARTS LIST ............................................................39