HT Instruments HT401 Bedienungsanleitung Seite 28

TABLE OF CONTENTS
1. PRECAUTIONS AND SAFETY MEASURES ............................................................... 2
1.1. Preliminary instructions.................................................................................................... 2
1.2. During use ....................................................................................................................... 3
1.3. After use .......................................................................................................................... 3
1.4. Definition of measurement (overvoltage) category ........................................................... 3
2. GENERAL DESCRIPTION ........................................................................................... 4
2.1. Measuring average values and TRMS values .................................................................. 4
2.2. Definition of true root mean square value and crest factor ............................................... 4
3. PREPARATION FOR USE ........................................................................................... 5
3.1. Initial checks .................................................................................................................... 5
3.2. Instrument power supply .................................................................................................. 5
3.3. Storage ............................................................................................................................ 5
4. NOMENCLATURE ........................................................................................................ 6
4.1. Instrument description ..................................................................................................... 6
4.2. Description of function keys ............................................................................................. 7
4.2.1. RANGE key ....................................................................................................................................... 7
4.2.2. VoltSense key .................................................................................................................................... 7
4.2.3. MIN MAX key ..................................................................................................................................... 7
4.2.4. SMART HOLD key ............................................................................................................................. 7
4.2.5. Backlight
4.2.6. MODE key ......................................................................................................................................... 7
4.3. Internal modes of instrument ........................................................................................... 8
4.3.1. PEAK/HOLD mode ............................................................................................................................ 8
4.3.2. AC+DC mode ..................................................................................................................................... 8
4.3.3. AutoV LoZ mode ................................................................................................................................ 8
4.3.4. Disabling the Auto Power OFF function ............................................................................................. 8
4.3.5. Wrong insertion indication ................................................................................................................. 8
5. OPERATING INSTRUCTIONS ..................................................................................... 9
5.1. DC Voltage measurement ............................................................................................... 9
5.2. AC Voltage measurement and Frequency ..................................................................... 10
5.3. AC Voltage measurement with low input impedance ..................................................... 11
5.4. DC Current measurement .............................................................................................. 12
5.5. AC Current measurement and Frequency ..................................................................... 13
5.6. Resistance measurement .............................................................................................. 14
5.7. Diode and Continuity test ............................................................................................... 15
5.8. Capacitance measurement ............................................................................................ 16
5.9. Temperature measurement with type K probe ............................................................... 17
6. MAINTENANCE.......................................................................................................... 18
6.1. Battery and fuses replacement ...................................................................................... 18
6.2. Cleaning the instrument ................................................................................................. 18
6.3. End of life ...................................................................................................................... 18
7. TECHNICAL SPECIFICATIONS ................................................................................ 19
7.1. Technical characteristics ............................................................................................... 19
7.1.1. Electrical characteristics .................................................................................................................. 21
7.1.2. Reference standards ....................................................................................................................... 21
7.1.3. General characteristics .................................................................................................................... 21
7.2. Environment .................................................................................................................. 22
7.2.1. Environmental conditions for use ..................................................................................................... 22
7.3. Accessories ................................................................................................................... 22
7.3.1. Standard accessories ...................................................................................................................... 22
7.3.2. Optional accessories ....................................................................................................................... 22
8. SERVICE .................................................................................................................... 23
8.1. Warranty conditions ....................................................................................................... 23
8.2. Service .......................................................................................................................... 23
key ............................................................................................................................... 7
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HT401