MODEL 605 NEGATIVE CAPACITANCE ELECTROMETER INSTRUCTION MANUAL
■The Keithley Model 605 is a negative capacitance electrometer
■What is a negative capacitance electrometer?
▲When a signal from a high impedance source is amplified, the capacitance of the amplifier input and the connecting cable greatly degrades the signal rise time. For example, with only 20-picofarad shunt capacitance, a signal from a 20-megohm source has a 400-microsecond rise time.
▲A negative capacitance electrometer is useful for improving the rise time of signals from high impedance sources. This is accomplished by applying in-phase feedback from the output of a fixed gain amplifier to the input through a properly chosen capacitor. Reducing the effective capacitance in the example to 1 picofarad, possible with the Model 605, improves rise time to 20 microsecond.
●FEATURES
■Battery operation allows the Model 605 to operate inside shielded areas without introducing extraneous power line noise.
■Only three operating controls and a power switch are used: a 10-turn zero potentiometer which compensates for resting potentials and other dc offsets up to 100 millivolts; a control on the input head for preliminary capacitance adjustment; and a fine capacitance adjustment on the power module. The remote location of the fine capacitance control and zero potentiometer allows adjustment without disturbing the experiment.
■The Model 605 has grid current less than 10^-14 ampere and current drift less than ampere per day or per ℃ without requiring a compensating adjustment. The low grid current minimizes the possibility of polarizing the cell under study.
■In addition to low grid current, the Model 605 offers input resistance greater than ohms, shunt capacitance adjustable to less than 1 picofarad with a 22 megohm source, and short circuit noise less than 35 microvolts rms. The rise time of less than 20 micro- seconds with a 22-megohm source permits faithful reproduction of pulse.
■The power module has an input for a ramp calibrating signal, allowing microelectrode testing and optimum neutralization adjustment without disturbing the test preparation.
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MODEL 605 、 605 、 Model 6051 、 6051 |
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User's Guide |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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1.5 MB |
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