The Stanford Reasearch SIM921 AC Resistance Bridge is a precision, low-noise instrument designed for cryogenic thermometry applications. With excitation power below 100 aW, thermistors and other resistive samples can be measured at temperatures below 50 mK with negligible self-heating errors.
The SIM921 measures resistance using a four-wire circuit, eliminating the direct effect of lead resistance on the result. Thermal EMFs and amplifier offset drifts are avoided by using an AC excitation current source. The excitation frequency can be adjusted from 2 Hz to 60 Hz, either from the front panel or over the computer interface.
This flexibility allows the user to operate at a synchronous sub-harmonic of the power line frequency (such as 15 Hz/12.5 Hz) or at some incommensurate frequency, depending on requirements. Multiple SIM921s can be operated at different frequencies in the same experimental set-up without risking in-band crosstalk.
Stanford Research SIM921 AC Resistance Bridge Module and other Precision Thermometers for sale at Test Equipment Center.
Stanford Research SIM921 products for sale at Test Equipment Center are thoroughly tested, and receive electrical and cosmetic reconditioning as needed prior to sale. All products include a 90 day warranty from Test Equipment Center to ensure your complete satisfaction.
Test Equipment Center sells used Precision Thermometers and Temperature Test Products from Stanford Research and many other test equipment manufacturers.
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