吉时利485自动量程皮安表是一种低成本，高度灵敏，易于使用的仪器。输入可以承受极高的过载，从而在测试，研究和学生实验室的广泛应用中具有灵活性。模拟输出将输入电流线性转换为电压，以用于硬拷贝输出或控制环路应用。吉时利485的输入电压降（负担）受到反馈技术的有效限制，因此，这种皮安表即使在电源电压非常低的电路中也可以进行高精度的电流测量。
吉时利485具有一些有助于测量低电流的功能。在自动量程模式下，该皮安表可最大化分辨率。REL按钮相对于基线进行读数（触摸按钮之前的读数）。LOG按钮将显示转换为被测电流绝对值的对数（以10为底）。可从前面板或通过总线执行数字校准。100点数据存储缓冲区以六种自动读取速率之一（从每秒三种到每小时一种）或以“存储”按钮手动收集和存储测量值。最小和最大读数在数据存储模式下以每秒3个的速度连续更新。
吉时利485自动量程皮安表的功能和规格包括：
The Keithley 485 Autoranging Picoammeter is a low-cost, highly sensitive, easy-to-use instrument. The input can withstand extrememly high overloads for flexibility in a wide range of applications in test, research, and student labs. An analog output linearly converts the incoming current to voltage for hard copy output or control loop applications. The Keithley 485’s input voltage drop (burden) is actively constrained by feedback techniques so that this picoammeter makes high accuracy current measurements even in circuits with very low source voltages.
The Keithley 485 has several features that facilitate measuring low current. In the autorange mode, this picoammeter maximizes resolution. The REL button makes readings relative to the baseline (the reading prior to touching the button). The LOG button converts the display to the logarithm (base 10) of the absolute value of the measured current. Digital calibration is performed from the front panel or over the bus. A 100-point data store buffer collects and stores measurements at one of six automatic reading rates from three per second to one per hour, or manually with the STORE button. Minimum and maximum readings are continuously updated at three per second in the data store mode.
Features and Specifications of the Keithley 485 Autoranging Picoammeter include:
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