Hsiang Cheng Corp. ® MKH Series

Digital Programmable Watthour, Varhour Meters

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Hsiang Cheng, MWH & MKH DMMs
Characteristics:
  • Accuracy:4% rd ±0.1%fs MWHX, MWHY, MWHZ, MWHQ, MWHXD, MWHYD, MWHZD, MWHQD, MKHXD,MKHYD,MKHZD,MKHQD0

0.2% rd ±0.02%fs

MWHX2, MWHY2, MWHZ2,MWHQ2, MWHXD2, MWHYD2, MWHZD2, MWHQd2, MKHXD2, MKHYD2, MKHZD2,MKHQD2)
  • Output pulse: Photocouple isolator, open colector 30V, 50mAmaximum
  • PTxCT Ratio setting of 3 first effective digits, normal range 0-999
  • Temperature coefficient: < 70 ppm wh version, < 100 ppm varh per degree C
  • Seven (7) digits 9999999 counts maximum
  • Display: 0.3″super rated LED
  • Conversional rate less 0.4 sec typically
  • Current Over Range: 3 X rating-continuous, 10X rating-30sec, 25X rating-3sec.
  • Voltage Over Range: maximum continuous 750V or 1.5X rating
  • Frequency Watt version: 50 or 60 ±5 Hz for watthours version
  • Var version: Norminal 50/60 hz for Varhours version (50/60 ±.5 Hz–less 0.002 change per 0.1 Hz change)
  • Dielectric strength: 2.5 kvrms/ 1 minute, (case)
  • 2 kvrms/ 1 minute, input terminals to power terminals
Product Description:
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space The MWH & MKH series are programmable watthour and varhour meters, designed to solve for variable CT & PT Ratios. A crystal based pulse generator is the heart of V-F conversion system from analog to digital conditioning.7 digits counter Programmable CT and PT ratio: 3 first PT/CT ratio effective digits, setting range 0-999. Single/dual display : single only for forward power of watthour. Dual for forward & reversed status for watthour series, l ead & lag status for Varhour series. Switchable for engineering unit selection of KWH or MWH annunciatiors. Selectable decimal point for range , resolution or display reading. Two LED annunciators indicating power flowing status, forward or reverse for wh, lead or lag for varh.
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Specifications :
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Range:
Accuracy (23 + 3°C): .4% rd / PF + 0.1%fs :MWHX, MWHY,MWHZ, MWHQ, MWHXD, MWHYD, MWHZD, MWHQD, MKHXD, MKHYD, MKHZD, MKHQD 0.2% rd / PF + 0.02%fs: MWHX2, MWHY2, MWHZ2, MWHQ2, MKHXD2, MWHYD2, MWHZD2, MWHQD2, MKHXD2, MKHYD2, MKHZD2, MKHQD2 ( PF=COSØ For wh version, PF=SINØ for varh version.
Output Pulse: Photo couple isolator, open colector 30V, 50mA maximum
Ratio setting : PT / CT Ratio setting of 3 first effective digits, normal range 0-999
Stability : Temperature coefficient < 70 ppm wh version, < 100 ppm varh version per degree C, long term draft
Digits & counts: digits 9999999 counts maximum
Display : 0.3″ super rate LED
Response time : Conversional rate less 0.4 sec typically
Input burden : 0.25VA maximum per imput element
input Overload: Current input 3 * rating-continuous, 10 * rating-30sec., 25 * rating-3sec.Voltage input maximum continuous 750V or 1.5 rating, which ever great
Frequency Watt version : 50 or 60 + 5Hz for watthours version.
Frequency Var version : 50 / 60 Hz for Varhours version ( 50/60 + 0.5 Hz — less 0.002 change per 0.1 Hz change )
Crest factor Normally ≤ 3, MWH series only
Waveform 3rd 30% for watt version only
Dielectric strength: 2.5 KV rms / 1 minute, all terminals to reference ground2 KV rms / 1 minute, input terminals to power terminals
Surge test: ANSI C37.90 / 1989, IEC 255-3 (1989)
Impulse Voltage: 1.2 * 50 us 4 KV
Oscillating wave : 0.5us-100KHz 3KV & 1MHz-0.25 2.5 KV
Operating condition Operating temperature :-10 to 55°C, 0-99% RH non-condensed Storage: -25 to 70°C, 20-99% RH non-condensed
Auxiliary power AC / DC version: AC + 15% < 6 VA, DC + 20% < 6 watts
Applied rules and standards
Measuring & conversion: IEC 688
Dielectric strength: IEC 688
Impulse & Surge test: ANSI C37.90.1/1989IEC 255-3 (1989)
Adaptability-power system: IEC 0110
Measuring reliability: VDE 3540
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pdf_pic Downloads: General Specifications
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