M
AVTMTTR100-ENG Rev 6 Nov 2015
10
Loading of Test Transformer
Less than 0.1 VA
Measuring Ranges
Turn ratio: 8 V ac 0.8 to 20,000, 5 digit resolution
(for transformers & PT testing)
1.5V ac 5.0 to 2220, 5 digit resolution
(For CT testing)
Current: 0 to 100 mA, 4 digit resolution
Phase deviation: ± 90 degrees, 1 decimal point for the minutes
display, 2 decimal points for the degree
display, 2 decimal points for the centiradian
display
DC Winding Resistance: 0 to 2000 Ohms, 4 digit resolution
Transformer Polarity: Additive or Subtractive
Transformer vector group: 1PH0 or 1PH6
Calculated Value
Ratio Deviation, % Difference between calculated and measured
turn rations, in %
Accuracy
Turn ratio*: ±0.20% (0.8 to 4000)
±0.25% (4001 to 10,000)
±0.30% (10,001 to 20,000)
*For Excitation Current Values no greater than
preset value
Current (rms): ±5% of reading, ±0.5 mA
Phase deviation: ±5 minutes
(limit of ratio) 0.8:1 to 2,000:1
DC Winding Resistance: ±(10% of reading ± 1 digit)
(10 to 2000 Ohms range)
±(10% of reading ±1 mOhm)
(10 mOhm to 9.99 Ohms range)
±(10% of reading ±0.5 mOhm)
(0.10 mOhm to 9.99 mOhms range)
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