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Digital Panel meters and switchboard meters
Hsiang Cheng Corp. ®
UFV & UFA Series, True RMS
AC Voltage and Current Digital Meters 		 
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Hsiang Cheng, MA & MV DMMs
  
 
  Characteristics:  
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  • Digital setup for PT, CT ratio and auto range scale
  • AC true RMS conversion
  • Wide auxiliary power range AC / DC 30-250V
  • High overload capability
  • High accuracy of 0.2%
  • 4-1/2 digits
  • Display with super rate LED
  
 
  Product Description:  
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Model UAF & UVF and UFA series, are micro-base digital Meters than can be connected directly to any PT or CT ratio, and with autoscaling,make these meters versatile. The UF series is ANSI-IEEE, VDE & DIN-IEC compliant, providing full protection for surge & unusual overload input, assuring safe and reliable operation.

  
 
  Specifications :  
 
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Range:
Accuracy (23 + 3°C):

0.2% fs, AC true RMS conversion
Input Range: UAF : 0-6A AC, 40-70Hz, 5A, 1A rating
UVF : 0-150V AC, 40-70HZ
Ratio setting : PT / CT Ratio setting of 3 first effective digits, normal range 0-999
Stability : Temperature range -10 to +55°C
Maximum : < 50ppm / °C
Long term stability < 0.2% drift maximum per year
Digits & counts: 4-1/2 digits -1999.9 counts maximum
Display : 0.56” super rate LED
Ratio Configuration set up: Digital setup in PT, CT ratio
Ratio range : 0.1~1999.9
Auto range in display reading to primary scale
Response time : Sample rate 1 of per sec typically
Input burden : 0.1 VA maximum
input Overload:

UAF : current input
3 x rating continuous........10 x rating 30 sec
50 x rating 3 sec................ 80 x rating 1 sec

UVF : Voltage input
Maximum continuous 750V rms, 1500V 30 sec
Dielectric strength: 2.5KV AC rms 1 minute, all terminals to case
2KV AC rms 1 minute common voltage, between input to power terminal
Surge test:

ANSI/IEEE C37.90-1989, DIN-IEC 255-4 / 1977
IEC 801-4 / 1988
Impulse Voltage: 1.2 x 50us 5KV
Oscillating wave: 0.5us~100KHz 4KV & 1MHz~0.25ms 4KV
Operating condition Temperature range -10 to 55°C,
0~99% RH non-condensed
Auxiliary power AC / DC version: AC / DC 30-250V < 3 watts, (40-70Hz for AC)
Applied rules and standards
Measuring & conversion: IEC 688
Dielectric strength:

IEC 688

Impulse & Surge test: ANSI C37.90.1/1989
IEC 255-3 (1989)
Adaptability-power system: IEC 0110
Measuring reliability: VDE 3540
 
 
  Downloads:  
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  pdf_pic Downloads: General Specifications  
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