Transformer Ratio Meters TRM-101 » Fully automatic micro-controller operated » Measure 3ph transformer connection group to IEC 76. » Identify group to IEC 76 » Measure ratio 10,000: 1 to IEC 76 » Measure PTCT ratio to IEC 60044 » Measure excitation current » Polarity mark check for 1 ph to IEC 60044 » Calculate ratio error to PRESET standard ratio » 8 G memory: saves up to 10,000 groups