picoammeter
The picoammeter is commonly used as a readout because of its high sensitivity.
由于皮安计具有很高的灵敏度，所以通常用作阳极电流的读出装置。
Note the top electrode is guarded, so that only current flowing across the insulator is measured by the picoammeter.
注意，顶部的电极接保护，所以只有流经绝缘体表面的电流才为皮安计所测量。
Since the voltage burden of the electrometer ammeter or picoammeter is less than 1mV, the diodes won't conduct.
由于静电计、安培计或皮安计的输入端压降小于1mV，这两个二极管不会导通。
Picoammeter amplifier gain can be changed as in the voltmeter circuit by using the combination shown in Figure 1-11.
和电压表电路一样,可以使用如图1-11所示的组合电路来改变皮安表放大器的增益。
This can be checked by observing the analog output of the electrometer or picoammeter with an oscilloscope.
用示波器观察静电计或皮安计的模拟输出，可以对此进行检查。
Figure 4-14 illustrates a typical test configuration using a Model 6485 Picoammeter.
图4-14示出使用6485型皮安计的典型配置情况。
The guard terminal of the electrometer ammeter or picoammeter is the LO input terminal.
静电计安培计和皮安计的保护端为LO输入端。
The basic configuration of the constant-voltage method using an electrometer or picoammeter is shown in Figure 2-30a.
使用静电计和皮安计的恒压法的基本电路配置如图2-30a所示。
Usually, this method requires two instruments: a voltage source and a picoammeter or electrometer.
通常，这种方法需要使用两台仪器：一台电压源和一台皮安计或静电计。
The resulting speed-up comes from the reduction of the input impedance of the picoammeter due to negative feedback.
速度提高的原因是由于负反馈的作用使皮安计的输入阻抗降低。
A picoammeter is an ammeter built along the lines of the ammeter function of an electrometer.
皮安表是安培表的一个门类，其实质上是静电计中安培表功能的延续。
Isolation resistance measurements are usually made by sourcing a voltage, then measuring the resulting current using an electrometer or picoammeter.
在测量隔离电阻时，通常是提供一个电压，然后利用一个静电计或皮可安培计测量形成的电流。
In such an arrangement, CIN doesn't shunt RFB, and has only a fraction of the effect it would have with a shunt picoammeter.
在这种情况下，CIN不会对RFB分流。其影响与分流皮安计的情况相比是很小的。
The main advantage of a logarithmic picoammeter is its ability to follow current changes over several decades without range changing.
对数皮安表的主要优点是能够在几个数量级的范围内跟踪电流的变化，而无须改变量程。
Rise time in a feedback picoammeter is a function of the physical or stray capacitance shunting the feedback resistance (RFB).
反馈型皮安计的上升时间是反馈电阻（RFB）上并联的物理电容或寄生电容的函数。
The voltage across RL1 is the picoammeter voltage burden, normally less than one millivolt, so the resulting current will be quite small.
RL1上的电压为皮安计的输入端压降，通常小于1mV，所以产生的电流是相当小的。
To avoid measurement errors, it's critical to make proper connections from the electrometer, SMU, or picoammeter to the device under test.
为了避免测量误差，关键之点在于将静电计、SMU或皮安计和被测装置进行适当的连接。
Given that the offset current may be hundreds of picoamps or less, an electrometer or picoammeter is required to measure it.
给出的偏移电流技术指标可能为几百皮安或更小，需要利用静电计或皮安计进行测量。
If this is the case, a simple coaxial vacuum feedthrough can be used to make connections from the collector to the picoammeter.
在这种情况下，可以使用简单的真空同轴接头来进行从收集电极到皮安计的连接。
The picoammeter reads the current at the last dynode, which is equal to the anode current minus the current flowing to the previous dynode.
皮安计在最后一个倍增管电极处读取电流，此电流等于阳极电流减去流过前一个倍增管电极的电流。
The rise time of a feedback picoammeter is normally limited by the time constant of the feedback resistor (RF) and any shunting capacitance (CF).
反馈皮安表的上升时间通常受反馈电阻器（RF）和并联电容（CF）形成的时间常数的限制。
Applications such as measuring light with a photomultiplier tube generally require the use of a picoammeter due to the low current levels involved.
由于要测量的电流非常弱，所以用光电倍增管测量光的应用工作通常需要使用皮安计。
Figure 2-24 shows a protection circuit for an electrometer ammeter or picoammeter, consisting of a resistor and two diodes (1N3595).
图2-24示出静电计或皮安计的过载保护电路，其中包括一个电阻器和两个二极管（1N3595）。
A basic approach to high speed measurements is to minimize stray shunting capacitance through careful mechanical design of the picoammeter.
实现高速测量的基本方法是，仔细地进行皮安表的机械设计以尽量减少寄生并联电容。
The voltage across RL1 is the picoammeter voltage burden, normally less than 1mV, so the resulting leakage current will be quite small.
RL1上的电压为皮安计上的电压降，通常不到1mV，因此产生的电流非常小。
The resulting current is distributed through the volume of the test sample and is measured using a picoammeter or electrometer.
产生的电流将分布在测试样品的体内，并由皮安计或静电计来测量。
To make the measurement, a constant voltage is applied for a prede fined period, usually 60 seconds, and the resulting current is measured with a picoammeter or electrometer.
为了进行测量，在预定的时间（通常为60秒钟）内，给样品施加恒定的电压。然后，用皮安计或静电计测量产生的电流。
Made from a conductive material, the shield is always connected to the low impedance input of the electrometer or picoammeter or to the output LO (or common) terminal of the SMU.
用导电材料制成的屏蔽总是连到静电计或皮安计的低阻抗输入端，或者连到SMU的LO输出端（或公共端）。
The system includes the following instruments: Model 7065 Hall Card, Model 2000 DMM, Model 6220 Current Source, Model 6485 Picoammeter, and Model 7001 Switch System.
该系统包括下列仪器：7065型霍尔卡、2000型数字多用表、6220型电流源、6485型皮安计和7001型开关系统。
One set of switches is used to apply the test voltage to each capacitor in turn; a second set of switches connects each capacitor to the picoammeter after a suitable soak period.
一套开关用来轮流向每一个电容器施加测试电压，另一套开关在适当的浸润时间之后将每个电容器连接到皮安计。
The most effective method of minimizing input capacitance is to connect the electrometer, SMU, or picoammeter to the signal source with a shielded cable that is as short as possible.
减小输入电容最有效的方法是用尽可能短的屏蔽电缆将静电计、SMU或皮安计与信号源连接起来。
The ideal way to measure the resistance of an insulating material is to apply a known potential to the sample and measure the resulting current with an electrometer or picoammeter.
测量绝缘材料电阻的理想方法是向样品施加一个已知的电压，再使用静电计或皮安计测量产生的电流。
log scale picoammeter
对数标度微微安培计
picoammeter
皮可安培计
scale picoammeter
对数标度微微安培计