User Manual
HT321 - HT322
EN - 1
Table of contents:
1. SAFETY PRECAUTIONS AND PROCEDURES .......................................................... 2
1.1. Preliminary ........................................................................................................................ 2
1.2. During use ......................................................................................................................... 3
1.3. After use ............................................................................................................................ 3
1.4. Measuring (overvoltage) categories definitions ................................................................. 3
2. GENERAL DESCRIPTION ........................................................................................... 4
3. PREPARATION FOR USE ........................................................................................... 4
3.1. Initial .................................................................................................................................. 4
3.2. Supply voltage ................................................................................................................... 4
3.3. Calibration ......................................................................................................................... 4
3.4. Storage .............................................................................................................................. 4
4. OPERATING INSTRUCTIONS ..................................................................................... 5
4.1. Instrument description ....................................................................................................... 5
4.1.1. Front panel description ............................................................................................................... 5
4.2. Description of function keys .............................................................................................. 6
4.2.1. HOLD Key................................................................................................................................... 6
4.2.2. R (RANGE) Key .......................................................................................................................... 6
4.2.3. MAX Key ..................................................................................................................................... 6
4.2.4. SEL Key ...................................................................................................................................... 6
4.2.5. Backlight key (only HT322) ................................................................................................. 6
4.2.6. Auto Power OFF ......................................................................................................................... 6
4.3. Measurements ................................................................................................................... 7
4.3.1. DC Voltage measurement .......................................................................................................... 7
4.3.2. AC Voltage measurement .......................................................................................................... 8
4.3.3. Resistance measurement ........................................................................................................... 9
4.3.4. Diode test and Continuity test .................................................................................................. 10
4.3.5. Temperature measurement (only HT322) ................................................................................ 11
5. MAINTENANCE .......................................................................................................... 12
5.1. General information ......................................................................................................... 12
5.2. Battery replacement ........................................................................................................ 12
5.3. Cleaning .......................................................................................................................... 12
5.4. End of life ........................................................................................................................ 12
6. TECHNICAL SPECIFICATIONS ................................................................................. 13
6.1. Technical features ........................................................................................................... 13
6.1.1. Safety ........................................................................................................................................ 14
6.1.2. General data ............................................................................................................................. 14
6.2. Environment .................................................................................................................... 14
6.2.1. Environmental conditions ......................................................................................................... 14
6.3. Accessories ..................................................................................................................... 14
6.3.1. Standard accessories ............................................................................................................... 14
6.3.2. Optional accessories ................................................................................................................ 14
7. SERVICE .................................................................................................................... 15
7.1. Warranty conditions......................................................................................................... 15
7.2. After-sale service............................................................................................................. 15