ELECTROMETER Definition
نویسنده
چکیده
An electrometer is an electrical instrument for measuring electric charge or electrical potential difference. There are many different types, ranging from historical hand-made mechanical instruments to high-precision electronic devices. Modern electrometers based on vacuum tube or solid state technology can be used to make voltage and charge measurements with very low leakage currents, down to 1 femtoampere. A simpler but related instrument, the electroscope, works on similar principles but only indicates the relative magnitudes of voltages or charges.
منابع مشابه
An integrated-circuit based wide range electrometer implemented with automatically ranged linear display
In the measurement of dc current for the range of 10-6-10-‘2 A, a stable electrometer is required. The electrometer circuit is usually implemented by simply probing the voltage drop on a load resistor using a sensitive voltage amplifier.’ In this scheme, different values of the load resistor are needed to cover multi decade range without saturating the voltage amplifier. This results in differe...
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We show that a single-Cooper-pair transistor (SCPT) electrometer emits narrow-band microwave radiation when biased in its subgap region. Photoexcitation of quasiparticle tunneling in a nearby SCPT is used to spectroscopically detect this radiation in a configuration that closely mimics a qubit-electrometer integrated circuit. We identify emission lines due to Josephson radiation and radiative t...
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We have designed, fabricated, and operated an electrometer with a noise-equivalent resolution of 535 electrons rms (86 aC). The electrometer incorporates a silicon resonator that acts as a variable capacitor and is fabricated using a new self-assembly process that demonstrates for the first time the integration of lownoise, low-leakage JFETs with SOI structures. The resolution of the measuremen...
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An electrometer using complementary metal–oxide–semiconductor bilateral switches for automatic range control is described. Based on a dual-switching configuration, the electrometer is capable of current measurement over eight orders of magnitude. Together with a voltage shifter, this circuit provides a quasilinear analog output for the measurement of input dc current between 10 and 10 A. The ap...
متن کاملThe effect of electrostatic screening on a nanometer scale electrometer.
We investigate the effect of electrostatic screening on a nanoscale silicon MOSFET electrometer. We find that screening by the lightly doped p-type substrate, on which the MOSFET is fabricated, significantly affects the sensitivity of the device. We are able to tune the rate and magnitude of the screening effect by varying the temperature and the voltages applied to the device, respectively. We...
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