Hsiang Cheng ® MWF & MKF Series

Digital Programmable Watt and Var Meters

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Hsiang Cheng, MWF & MKF DMMs
Characteristics:
  • Accuracy:0.5% fs: MWFX, MWFY, MWFZ, MWFQ, MKFX, MKFY, MKFQ) 0.2% fs: MWFX2, MWFY2, MWFZ2, MWFQ2, MKFY2, MKFZ2, MKFQ2 (4-1/2 dgt)
  • Temperature coefficient: < 80 ppm per degree C
  • Long term drift < 0.2% per year
  • 3-3/4 digits 3999 counts maximum
  • 4-1/2 digits 19999 counts maximum
  • Display 0.8″super rated LED
  • Response time Sample rate 1 pf per sec typically
  • Current Over Range: 3 X rating-continuous, 10X rating-30sec, 25X rating-3sec.
  • Dielectric strength: 2.5 kvrms/ 1 minute, (case)
  • 2 kvrms/ 1 minute, input terminals to power terminals
Product Description:
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space Model MWF & MKF series of programmable watt & var meters, measure active and reactive power, and are designed to to solve PT & CT Ratio problems and uses a time division multiplier principle making these meters extremely accurate and able to measure distorted input signals.16000 counts MWFZ/MWFZ2/MKFZ/MKFZ2/MWFQ /MWFQ2/MKFQ/MKFQ2————–3 phase 4 wire system. 11000 counts MWFY/MWFY2/MKFY/MKFY2——-3 phase 4 wire system. 5500 counts MWFX/MWFX2/MKFX/MKFX2——-1 phase 2 wires system.
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Specifications :
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Range:
Accuracy (23 + 3°C): MWX, MWY,MWZ, MWQ,MKX,MKY,MKQ(3-3/4 digits) 0.5% fs or 5 cts. which ever greater MWX4,MWY4,MWZ4,MWQ4,MKY4,MKZ4,MKQ4 (4-1/2 digits) 0.25% fs + 1 count:
Stability : Temperature coefficient < 60 ppm per degree CLong term draft < 0.2% per year
Digits & counts: 3/4 digits 3999 counts maximum4-1/2 digits 19999 counts maximum
Display : 0.56” super rate LED
Response time : Sample rate 1pf per sec typically
input Overload: Current input: 3 time rating-continuous, 10 time rating-30sec, 25 time rating-3secVoltage input: maximum continuous 750V or 1.5 rating which ever great
Frequency Watt version : norminal + 5Hz
Frequency Var version : norminal + 0.5 hz < 0.2% change for 0.1 Hz deviated of center frequency
Crest factor Normally < 3, MW.. series only
Waveform 3rd 30% for watt version only
Dielectric strength: 2.5KV rms / 1 minute, all terminals to reference ground2KV rms / 1 minute, input terminals to power terminals
Surge test: ANSI C37.90.1 / 1989, IEC 255-3 (1989)
Impulse Voltage: 1.2 * 50 us 4 KV
Oscillating wave : 0.5us-100KHz 3KV or 1MHz-0.25 ms 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: C + 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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