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Description |
- This solid state electrometer is capable of measuring very small charges and currents, making it a versatile instrument.By using Plancks constant apparatus (F4H28615) it is possible to measure tiny currents caused by photoelectric emission, and thus obtain a value for Plancks constant. There are three methods described by the instructions included with the Electrometer.A wide range of investigations into electrostatics and capacitance can be carried out, especially with the Electrostatics Accessories Kit F4L02719 (see page 25).Determine which materials are electropositive and electronegativeObserve electrostatic induction by bringing charged objects close to conductorsInvestigate the distribution of charge on conductors of various shapesObserve the charging and discharging of capacitors.Measure the permittivity of free space.. Modern components and construction ensure much improved performance, reliability and robustness. For example, captive J-links are used to select the capacitance or current range required, while no zero offset control is required. The internal 9V PP3 battery should give at least 6 months continuous use. This instrument gives outputs in the range 0-1V in response to extremely small currents or charges. An external 1V voltmeter is used to show the reading. Selecting one of the internal 1nF or 100nF capacitors or 10M, 1000M (1GΩ) or 100GΩ resistors, (the x1 and x10 gain switch on the amplifier provides the decades between these values) means that current ranges from 100nA to 1pA or charge ranges from 10-7 to 10-9 coulombs can be measured. All 4mm sockets are PTFE insulated to minimise leakage currents. The input socket is a UHF socket with 4mm central socket.Supplied with comprehensive manual.
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