附加的功能：
描述：
487是吉时利的PicoAmmeter。当您需要在皮安级范围内测量极低的电流水平时，皮安表是正确的仪器。吉时利（Keithley）的皮安表最多可测量20飞安。
吉时利487设计用于测量低电流和非常高的电阻。该仪器具有486的所有功能，并增加了一个可编程的±500V电源。皮安表和电压源的这种组合在一台仪器中提供了功能强大的高电阻表和快速皮安表。
皮安表可进行10fA至2mA的电流测量。提供两个电压源范围：分辨率为10mV的500V范围和分辨率为1mV的50V范围。预设按钮允许用户在两个单独的源值之间切换。
吉时利487提供高达500V的电压，以10fA的灵敏度测量电流，然后立即计算出500mΩ至5×1016Ω的电阻值。单位显示电流或电阻。可以设置从10ms到1000s的读取间隔，从而简化了需要预定“浸泡”时间的测试。
两个显示屏，一个用于电流读数，一个用于电压源，允许在整个测量过程中查看电压设置和被测电流。
Additional Features:
Description:
The 487 is a PicoAmmeter from Keithley. When you need to measure extremely low current levels in the picoampere range - a picoammeter is the right instrument. Picoammeters from Keithley can measure down to 20 femtoamperes.
The Keithley 487 is designed for measurement of low currents and very high resistances. This instrument incorporates all the capabilities of the 486, and adds a programmable ±500V source. This combination of picoammeter and voltage source provides a powerful high resistance meter and fast picoammeter in one instrument.
This picoammeter makes current measurements from 10fA to 2mA. Two voltage source ranges are available: a 500V range with 10mV resolution and a 50V range with 1mV resolution. A PRESET button allows the user to toggle between two separate source values.
The Keithley 487 sources up to 500V, measures the current with 10fA sensitivity, and then instantly calculates the resistance value, from 500mΩ to 5 × 1016Ω. The unit displays either current or resistance. Reading intervals from 10ms to 1000s can be programmed, simplifying tests that require a predetermined “soak” time.
Two displays, one for current readings and one for voltage sourcing, permit the voltage setting and the measured current to be viewed throughout the measurement.
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