Key features
- Spring loaded jewel and pivot system; magnetic shielding
- Efficient oil damping system for near deadbeat pointer movement
- Indicate true RMS values practically independent of waveform
- Engineering plastic housing; shrouded terminals on request
- Initial suppression for voltmeter; end suppression up to 6 times for ammeter
- CE certified
Technical specifications
Voltmeter| Operating voltage | 15 V to 600 V; 100 V/110 V for PT secondary |
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| Burden | 15 V to 30 V < 100 mA; 50 V to 100 V < 30 mA; 110 V to 200 V < 15 mA; 200 V to 600 V < 7.5 mA |
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Ammeter| Operating current | 1 A to 100 A in 72 x 72; 1 A to 200 A in 96 x 96; 1 A/5 A for CT secondary |
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| Burden | 0.25 A to 30 A < 1 VA; above 30 A < 1.5 VA |
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General specifications| Type | Moving iron, slide in scale |
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| Scale | Non-linear; compressed initially, readability from approx. 10 to 15 degrees |
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| Frequency | 45 Hz – 65 Hz (400 Hz on request) |
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| Accuracy | Class 1.5 |
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| Insulation resistance | Greater than 20 MΩ at 500 V DC |
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| Dielectric test | 2 kV RMS for 1 minute |
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| Overload continuous | 1.2 times |
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| Overload short time | 2 times Vn / 10 times In for 5 seconds |
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| Operating temperature | -10 °C to 55 °C |
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| Storage temperature | -20 °C to 70 °C |
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| Humidity | Up to 95% RH |
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| Conforms to | I.S. 1248 / I.E.C. 60051 (Part 2) |
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Mechanical| SMI72 (slide in) | 72 x 72 x 60 mm; cutout 68 x 68 (+0.7) mm; scale length approx. 60 mm; < 145 g (amps), < 180 g (volts) |
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| SMI96 (slide in) | 96 x 96 x 60 mm; cutout 92 x 92 (+0.8) mm; scale length approx. 90 mm; < 200 g (amps), < 230 g (volts) |
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| SMI48 (non slide in dial) | 48 x 48 x 45 mm; cutout 45 x 45 (+0.6) mm; scale length approx. 40 mm; approx. 100 g |
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| SMI144 (non slide in dial) | 144 x 144 x 50 mm; cutout 138 x 138 (+1.0) mm; scale length approx. 145 mm; approx. 400 g |
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Ordering information| Specify | 1) Type 2) Model 3) Operating voltage & PTR for voltmeter 4) Operating current & CTR for ammeter |
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