Option G Noise-Hardened Torquemeters

FOR IMMEDIATE RELEASE ........ March 18, 1999

For use in severe electromagnetic interference (EMI)

• Improves Noise Immunity By A Factor Of 10
• Now Standard On MCRT® Premium Grade Torquemeters
• Optional On Other MCRT® Torquemeter Models
• Retains Original Torquemeter Features And Specifications

Modern adjustable speed drives (ASD's) rapidly switch insulated gate bipolar transistors (IGBT's) under microprocessor control. Most switch the motor currents when they are high, not at axis crossings when the current is zero.

As a result, these drives generate severe EMI which can cause large measurement errors with ordinary torquemeters. Even standard MCRT® torquemeters, world renowned for their tolerance of electrical noise and machinery fields, can see errors -- usually less than 1% of rating, model dependent.

Option G incorporates new technology that improves noise immunity by a factor of ten or more, compared to that of the same model without Option G. The improvement virtually eliminates EMI as a factor and is now standard on premium grade MCRT® torquemeters. The table summarizes model availability.

Of the torquemeters available with Option G, DC Operated Sensors provide the greatest immunity; their ±5 Volt output signal and their low output impedance makes them less vulnerable to cable noise than other types.  

For More Information Contact:
S. Himmelstein and Company
2490 Pembroke Ave
Hoffman Estates, IL 60169
Tel: 847-843-3300
FAX: 847-843-8488
email: sales@himmelstein.com