Resistance Standard Rack Modular 6634A better than 2 ppm

Perfect for Automated Measurement Systems or as a Primary Laboratory Resistance Standard

The Model 6634A is excellent as a working standard for automated resistance measurement systems or as reference standards at the primary level. Special resistance values are available in the range of 0.001 Ω to 100 MΩ.

Standard model variations are available with 5, 6, 7, 8, 9 or 10 resistance elements installed. All models purchased with less than 10 resistance standards can be expanded at any time via a factory upgrade. Special resistance values can also be ordered.

A New Low Ohms Configuration is now available for values below 0.1 Ω. This Series has the same precision temperature stability as the Normal Ohms Configuration, but is limited to a maximum of 3 Resistance Elements. This is due to the large size of the low ohmic elements. The Resistance Range of the Low Ohms models is from 1 mΩ to 100 mΩ.

One key advantage of Guildline Resistance Standards is that each Resistance Value is made up from multiple resistance elements, not just a single element which is the technique used by most manufacturers. This approach lowers the drift that is seen with a single element and reduces the internal noise generated inside the reference resistor. Other real advantages are the use of a PRT vs a thermistor for internal temperature control, and the Guildline 6634A Standard does not require any fans like competitive models. The result is industry leading annual drift rates and very quiet measurements.