晶体管特性图示仪校准装置

为了满足广东省晶体管特性图示仪检定的量值溯源的需要，确保晶体管特性图示仪的量值准确可靠，特建立此计量标准。

1 计量标准器组成。

晶体管特性图示仪检定装置由标准直流电压源、标准直流电流源、差分示波器、直流电阻器等标准器组成。其中，标准直流电压源和标准直流电流源由5500A型多功能校准器代替，其测量范围是直流电压为0～1000 V；直流电流为1 μA～10 A。差分示波器采用SR46A型差分示波器，其Y轴带宽为DC～1 MHz。直流电阻器的电阻范围是0.01 Ω～100 kΩ。

2 计量标准器的工作原理。

2.1 标准直流电压源的电压输出至晶体管特性图示仪的相应端口，直接检定晶体管特性图示仪X轴的基极和集电极电压偏转因数。

2.2 标准直流电流源的电流输出至晶体管特性图示仪的相应端口，直接检定晶体管特性图示仪Y轴的集电极电流偏转因数。

2.3 将标准直流电压源电压输出至差分示波器的一个差分输入端；晶体管特性图示仪的阶梯电压信号输出至差分示波器的另一个差分输入端。利用差分比较的方法检定晶体管特性图示仪的阶梯电压信号。

2.4 将标准直流电压源电压输出至差分示波器的一个差分输入端；晶体管特性图示仪的阶梯电流信号通过直流电阻器取样后，取样电压送至差分示波器的另一个差分输入端。利用差分比较的方法检定晶体管特性图示仪的阶梯电流信号。

In order to meet the requirements of metrological traceability for the verification of transistor curve tracers in Guangdong Province and ensure the accuracy and reliability of their measured values, this metrological standard is established.

1 Composition of the metrological standard devices
The verification device for transistor curve tracers consists of standard DC voltage sources, standard DC current sources, differential oscilloscopes, DC resistors and other standard metrological devices. Among them, the standard DC voltage source and standard DC current source are realized by a 5500A multifunction calibrator, with measurement ranges of 0~1000 V for DC voltage and 1 μA~10 A for DC current. The differential oscilloscope adopts the SR46A model, with a Y-axis bandwidth of DC~1 MHz. The resistance range of the DC resistors is 0.01 Ω~100 kΩ.

2 Working principles of the metrological standard devices
2.1 The voltage output from the standard DC voltage source is sent to the corresponding ports of the transistor curve tracer, which directly verifies the deflection factors of the base and collector voltage on the X-axis of the tracer.
2.2 The current output from the standard DC current source is sent to the corresponding ports of the transistor curve tracer, which directly verifies the deflection factor of the collector current on the Y-axis of the tracer.
2.3 The voltage output from the standard DC voltage source is sent to one differential input terminal of the differential oscilloscope, while the stepped voltage signal output from the transistor curve tracer is sent to the other differential input terminal. The stepped voltage signal of the tracer is verified using the differential comparison method.
2.4 The voltage output from the standard DC voltage source is sent to one differential input terminal of the differential oscilloscope. After the stepped current signal output from the transistor curve tracer is sampled by the DC resistor, the sampled voltage is sent to the other differential input terminal. The stepped current signal of the tracer is verified using the differential comparison method.