Guildline Instruments 6636 Series is a modular series of Temperature Stabilized Resistance Standards that can be rack mounted or simply set on a bench. The 6636 Series provides a logical extension to the popular 6634A series of Temperature Stabilized Resistance Standards. PRODUCT FEATURES Resistance Range: 10 MΩ to 100 TΩ In Single Decade Increments Temperature Coefficients as low as ± 0.2 ppm/°C Stabilities as low as < 6 ppm/year N-Type Design Ensures Low Noise Connections Eliminates Air and Oil Bath Requirements Ambient Temperature Range: 23 °C ± 5 °C Internal PRT Stability: ± 0.02 °C / Year Custom Internal Temperature Set Points Low Thermal EMF’s – Shielded Chamber Temperature Regulation: ± 0.01 °C Over a 1 Year Period Guarded Resistance Element Chamber Custom Values / Models Available CE Marked with World-Wide Voltage and Frequencies Available