RESISTANCE THERMOMETER BRIDGE FOR MEASUREMENT OF TEMPERATURES IN THE LIQUID HELIUM RANGE
A 33-cps resistance thermometer bridge, suitable for precise temperature measurements in the liquid helium range, has been designed as a completely self- contained unit. The amplifier has a gain of 120 db, band width of 0.3 cps, and input impedance of 10 kohms. With a power dissipation of 2 x 10/sup -8/ watts in the thermometer, resistance changes of 0.1 ohm can be detected. For a typical resistance thermometer this corresponds to a temperature change of 4 x 10/sup -6/ deg K at 2 deg K. Other features include high rejection of line-frequency pickup, short recovery time after saturation, and a combination gain bandwidth control which shortens the response time during preliminary balancing operations. (auth)
- Research Organization:
- Massachusetts Inst. of Tech., Lexington
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-12-016536
- OSTI ID:
- 4297980
- Journal Information:
- Rev. Sci. Instr., Journal Name: Rev. Sci. Instr. Vol. Vol: 29
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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