RM-11 Product Information
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• +/- 0.025% Maximum Error
• Autoranging Inputs
• Watthour Display
• VARhour/Qhour Models
• Lightweight, Portable

The RM-11 Metronic Primary Watthour Standard has typical accuracies in the 0.003% range and repeatabilities in the 0.001% range. The maximum worst case accuracy of the RM-11 is conservatively specified at 0.025% guaranteed for one year. This maximum accuracy applies to all operating points between 0.2 and 50 amperes, 60 to 600 volts AC and 0.5 lag to 1.0 power factor. Note that stability is included within this maximum accuracy specification.

The RM-11 is essentially an enhanced version of the RM-10 Portable Watthour Standard which has been optimized for accuracy and stability but still retaining the same lightweight, portable package. The RM-11 also provides many of the same key operating features.

The RM-11 is totally autoranging on the potential input and current input. Totally autoranging inputs, a feature pioneered by Radian, make it impossible to damage the unit by applying a signal to the wrong input. The three summing current inputs can be used to perform closed link testing. A maximum test current of 150 Amps can be used when paralleling the three 50 Amp rated inputs. The RM-11 provides a true watthour display with a Kh of 1 for its entire operating range. VARhour and Qhour functions as well as a communications port, are also available.

Optimum use of the RM-11 for testing secondary reference standards is achieved by using the RM-111 Automated Comparator in conjunction with RS232-Link™ Test Software.