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Model 456 - Temperature Controlled Standard Resistor

Temperature Controlled Fixed AC/DC Resistors

Nominal Temperature Coefficient of Resistance: +0.02ppm/°C (with temperature control on)18°C to 25°C
Power Rating: 0.5 watt at +25°C
Resistance Tolerance (Initial Resistance Accuracy): ±0.005%
Resistance Range: 5Ω to 3.3 MΩ
Current Noise: <0.010V (RMS) / Volt of Applied Voltage
Thermal EMF: 0.1V/°C Max; 0.05V/°C Typical

Precision oil bath that holds fixed standard resistors at a stable, uniform temperature for resistance metrology.

Dew point to 40°C operating range
±0.005°C stability and gradients (±0.003°C measured inside a fixed standard resistor)
Silent, vibration-free solid-state Peltier cooling
Houses several standard resistors; programmable stepping for temperature-coefficient work
Large color display, Ethernet and USB Host, data logging to USB

A four-terminal, oil-filled resistance standard for AC and DC thermometry bridges.

1 Ω to 10,000 Ω range (Types SRA and SRB)
Matched AC and DC performance to about 1000 Hz; 1 ppm AC/DC transfer (10 Ω to 10 kΩ)
2 ppm/year stability (0.5 ppm/year to special order)
Strain-free element immersed in dry oil, proven NPL (Wilkins) design
Calibrated in-house below 0.15 ppm (k = 2); NPL and NIST-traceable options