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MULTI MEASURING INSTRUMENTS HWT-301 Instruction Manual

Digital harmonics tester
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DIGITAL HARMONICS TESTER
MODEL HWT-301
INSTRUCTION MANUAL
Thank you very much for selecting our digital AC digital
harmonics tester.
This model is complex instrument and employ a very reliable
mechanical/electronic design.
Before you use your new instrument, read this Instruction
Manual completely and familiarize yourself thoroughly with
all functions. With proper use and care, your tester will give
you years of satisfactory service.
MULTI MEASURING INSTRUMENTS CO.,LTD.
Akihabara Murai Bldg. 7F, 1-26 Kanda Sakuma-cho,
Chiyoda-ku, Tokyo, Japan, 101-0025
TEL : +81-3-3251-7016 FAX : +81-3-3253-4278
Home Page :
http://www.mutimic.com/
E-mail :
multi@multimic.com

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Summary of Contents for MULTI MEASURING INSTRUMENTS HWT-301

  • Page 1 Manual completely and familiarize yourself thoroughly with all functions. With proper use and care, your tester will give you years of satisfactory service. MULTI MEASURING INSTRUMENTS CO.,LTD. Akihabara Murai Bldg. 7F, 1-26 Kanda Sakuma-cho, Chiyoda-ku, Tokyo, Japan, 101-0025 TEL : +81-3-3251-7016 FAX : +81-3-3253-4278 Home Page : http://www.mutimic.com/...
  • Page 2 C O N T E N T S 1. INTRODUCTION ................. P1. 2. SAFETY SUMMARY ..............P1. 3. SPECIFICATIONS 3-1 General Specification ..............P2. 3-2 Measuring Range ................ P2. 3-2-1 All Pass Mode ................P2. 3-2-2 Harmonics Mode ..............P3. 4.

  • Page 3: Introduction

    1. INTRODUCTION Model HWT-301 harmonics tester is portable and handheld clamp-on type tester which is least affected by external magnetic fields. It measures not only true rms value for line current and leakage current of the low voltage circuit over a range from 0.1mA to 300A but also the harmonics current and voltage in the line up to the 25th harmonics.

  • Page 4: Specifications 3-1 General Specification

    3. SPECIFICATIONS 3-1 General Specification Measuring method : Dual integration mode with true rms reading. Measuring function: Load current, leakage current, harmonics current, AC voltage, harmonics voltage, resistance. Safety standard : Meets the requirements for double insulation to IEC61010-1 and IEC 61010-2-032, Category II 600V or Category III 300V.

  • Page 5: Harmonics Mode

    AC voltage (True RMS) Range Resolution Accuracy Input impedance Max. input voltage 400mV 0.1mV AC 250V rms >10MΩ ±1.0%rdg±8dgt 400V 100mV AC 450V rms Resistance Range Resolution Accuracy Max. test current Open circuit voltage 1.5V 4000Ω 1Ω 70μA ±1.0%rdg±8dgt * Input Protection: 400V rms 3-2-2 Harmonics Mode Measuring method: Synchronous filter Measurable harmonics: Fundamental frequency to 25...

  • Page 6: Dimensions And Panel Function

    4. DIMENSIONS AND PANEL FUNCTION ①Current transducer(Jaw) ②Jaw opening lever ③Power switch: Push switch for power ON or OFF ④Range selector switch: Rotary switch for range selection ⑤Data hold switch: This push switch locks the display. To release, press the switch again to cancel the hold condition.

  • Page 7: Method Of Measurement 5-1 Preparation And Caution Before Measurement

    5. METHOD OF MEASUREMENT 5-1 Preparation and Caution before Measurement ● Avoid using the tester in places subject to high temperature, humidity or excessive vibration. ● Before measurements, be sure the data hold switch is set to “OFF” (It is impossible to make measurements if the data hold switch is set to “ON”).

  • Page 8: Line Current Measurement

    5-2 Line Current Measurement ① Set the POWER switch to "ON" position. ② Set the range selector switch to a range appropriate to the current to be measured. If the current of circuit is unknown, set the switch to highest range and reduce setting until satisfactory reading is obtained.

  • Page 9: Harmonics Current Measurement

    5-4 Harmonics Current Measurement ① Set the POWER switch to “ON”. ② Set the range selector switch to a range appropriate to the current to be measured. If the current of the circuit is not known, set the switch to highest range and reduce setting until satisfactory reading is obtained.

  • Page 10: Voltage Measurement

    5-6 Calculation Method of The Harmonic Distortion ① Harmonic distortion ratio for each harmonic number: In/I1 x 100 (%) I1 = Fundamental current In = Harmonic current for each harmonic number For example: Fundamental current 3A 5th harmonic current 0.5A 5th harmonic distortion ratio = 0.5/3x100 = 16.7% ②...

  • Page 11: Voltage Measurement For Ac 400Mv Range

    5-7-2 Voltage Measurement for AC 400mV Range ① Set the range selector switch to 400V/400mV range. ② To select AC 400mV, press V-RANGE switch once. The “mV” mark is displayed on the LCD. ③ Connect the plug of the black test lead into the “COM”...

  • Page 12: Replacement Of Batteries

    6. REPLACEMENT OF BATTERIES WARNING △ Prior to opening the case, always disconnect the test leads from the input terminal. When the battery becomes exhausted or drops below the operating voltage, the battery mark will appear on the display. Set the POWER switch to “OFF” prior to installing batteries.

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