Omega Engineering HH-21 User Manual Download Page 2 | Manualshive

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Summary of Contents for HH-21

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Page 3: ...lation Replacement 8 Memory Backup 9 Operation with Rechargeable Battery 9 Operating Instructions 9 1 Diagnostics 9 2 Display Annunciators 11 3 Function Keys 13 Service Information 18 1 Calibration Pr...

Page 4: ...eek at constant ambient temperature TEMPERATURE COEFFICIENT 18 C to 28 C included in accuracy specification From 0 C to 18 C and 28 C to 50 C less than 0 02 rdg 0 1 C C ENVIRONMENTAL LIMITS FOR OPERAT...

Page 5: ...dicates data available but not being up dated KEYPAD 9 momentary switches with tactile feedback select Power ON OFF Readout T1 T2 T1 T2 or SCAN TC type K J T Readout scale F C Resolution 0 1 1 Display...

Page 6: ...nciators Readout Scale F C TC Type K J T Hold when activated KEYPAD 5 momentary switches with tactile feedback select Power ON OFF TC type K J T Readout scale F C Resolution 0 1 1 Display Hold POWER O...

Page 7: ...splays error readout Retains function settings even when turned off Low battery and open sensor indication Input data scan and display hold modes MANUAL ADDENDA Improvements or changes to this manual...

Page 8: ...nstruction manual thoroughly before using to become familiar with the instrument s operations and capabilities WARNING Do not touch a temperature probe sheath when measuring excessively high or low te...

Page 9: ...removing the cover WARNING Never use this instrument or any probe or sensor inside a microwave oven CAUTION Avoid making sharp bends in probe or sensor lead wires Bending lead wires at a sharp angle...

Page 10: ...ng it off in the direction of the arrow located on the battery cover 2 Remove the old battery 3 Place the new battery in the battery compartment Be sure to observe proper polarity 4 Re install the bat...

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Page 12: ...us operation This duration can be extended indefinitely by operating simultaneously from both the battery and recharger OPERATING INSTRUCTIONS The following instructions make reference to keypad input...

Page 13: ...mo couple type Remove thermocouple from temperature source WARNING Do not touch the probe sheath when measuring excessively high or low temperatures WARNING Probe damage and personal injury could resu...

Page 14: ...hen less than 10 of battery life remains 5 K J T Thermocouple Type Annunciator These symbols indicate the thermocouple type selection NOTE To insure correct temperature readings the displayed thermoco...

Page 15: ...into the appropriate TC connector will give actual thermocouple temperature readings If the unit is turning on for the first time after installation of a new battery it will default to K type thermoco...

Page 16: ...retained during power off To insure proper temperature readings be sure that the displayed thermocouple type matches the type of thermocouple you are using The HOLD key when pressed will freeze the te...

Page 17: ...atures is enabled This function can be activated in one or more of the 3 measurement modes T1 T2 and T1 T2 To start recording select a desired measurement mode T1 T2 or T1 T2 then press REC When more...

Page 18: ...instructions to stop recording In this case the VIEW function will display static data that does not update The VIEW function cannot be initiated while the readout is in the SCAN mode For example to v...

Page 19: ...y See REC If the STOP CLR key is pressed again after stopping data recording MIN MAX data for the corresponding measurement mode is cleared and the REC annunciator is turned off NOTES MIN MAX data is...

Page 20: ...1 Turn OFF U U T 2 Remove rear cover Refer to Disassembly Instructions 3 Remove shorting plug J1 from circuit board Refer to Mechanical Parts Diagram for location P N CS 791 4 Replace rear cover Reins...

Page 21: ...0 F type T 20 Press HOLD key one last time Wait for HOLD annunciator to show on readout Indicates that calibration data is stored in EEPROM 21 Carefully remove battery cover while holding battery in p...

Page 22: ...edure CAUTION Do not use excessive torque when re installing the nylon machine screw into the rear case Excess torque will dam age the part WARNING Do not substitute a metal part for the nylon machine...

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Page 24: ...22 4 COMPONENT LAYOUT...

Page 25: ...or Carbon R 76 15M R3 4 9 13 14 15 16 Resistor Metal Film R 88 1K 32 R5 6 Resistor Metal Film R 88 909K R7 21 24 25 26 27 Resistor Metal Film R 88 10K 28 33 R8 Resistor Metal Film R 88 23 7K R10 Resis...

Page 26: ...LSI 120 Y1 Resonator Ceramic 1MHz CR 60 Keypad 4 Connector LCD CS 810 Clip Battery 865 306 1 Header Pin CS 790 2 Numbers in parentheses refer to notes below 1 Deleted from Model HH 21 2 Matched pair...

Page 27: ...25 6 SCHEMATIC DIAGRAMS 1 Signal Conditioning and A D...

Page 28: ...26 2 Microcomputer and Display...

Page 29: ...27 3 Power Supply...

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