The types of operating principle of ammeter are the rectifier type and the moving iron type, and the rectifier type ammeter has a merit of measuring small current value compared with moving iron type |
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ㆍTo deal with current exceeding 5A, use a 5A(1A) meter in combination with a C.T. ㆍA.C ammeter is used with a current transfomer externally mounted, and it is noted that primary current of a current transfomer and a full scale of the meter are identical when used. ㆍIf the circuit voltage exceeds 500V even when the current is less than 5A use a 5A(1A) meter in combination with a C.T to ensure insulation. ㆍThe scale range of ammeter for motor circuit is extended up to 150%~500% of rated current, so that these are proteced from the impact of the starting current and ensured of long life. ㆍAm expanded scale has the nirmal maximum reading(upper limit of effective measurement range) at the app. 65% point on the scale, and the rest of it(65%~100%) is devoted to extension reading.(tolerance of extension area : ±5%) |
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형 식 |
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직결사용 |
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CT 사용 |
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최저측정치 |
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최대측정치 |
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최저측정치 |
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최대측정치 |
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rectifier type |
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100mA |
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30A |
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* / 1A |
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* / 5A |
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iron type |
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30mA |
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30A |
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* / 1A |
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* / 5A |
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Shape of case |
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Type |
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Rated Curr. |
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Operating Princ |
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Accur(%) |
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Freq |
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Berden(VA) |
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Rectangular(60x60mm) |
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D-60 |
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AC DC |
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5A 50,60mV |
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±2.5 ±2.5 |
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50~60Hz |
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1.0 50mV Drop |
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Rectangular(60x80mm) |
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D-68 |
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AC DC |
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5A 50,60mV |
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±2.5 ±2.5 |
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50~60Hz |
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1.0 50mV Drop |
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Rectangular(80x60mm) |
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D-80 |
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AC DC |
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5A 50,60mV |
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±2.5 ±2.5 |
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50~60Hz |
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1.0 50mV Drop |
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Rectangular(100x83mm) |
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D-100 |
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AC DC |
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5A 50,60mV |
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±1.5 ±1.5 |
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50~60Hz |
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1.0 50mV Drop |
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Rectangular(80x80mm) Wide Angle |
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D-800 |
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AC DC |
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5A 50,60mV |
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±1.5 ±1.5 |
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50~60Hz |
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1.0 50mV Drop |
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Rectangular(110x110mm) Wide Angle |
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D-110 |
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AC DC |
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5A 50,60mV |
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±1.5 ±1.5 |
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50~60Hz |
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1.0 50mV Drop |
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Rectangular(70ø) |
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D-70 |
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AC DC |
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5A 50,60mV |
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±2.5 ±2.5 |
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50~60Hz |
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1.0 50mV Drop |
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Rectangular(72x72mm) |
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D-200 |
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AC DC |
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5A 50,60mV |
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±1.5 ±1.5 |
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50~60Hz |
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1.0 50mV Drop |
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Rectangular(98x98mm) |
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D-300 |
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AC DC |
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5A 50,60mV |
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±1.5 ±1.5 |
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50~60Hz |
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1.0 50mV Drop |
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