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采用2600A系列数字源表触发模型有可能实现高精密定时，因此在脉冲调制[1]的相关应用中具有优势。下面以二极管结温测量为例进行说明。

The precision timing made possible when using the Series 2600A trigger model has advantages in applications that involve pulsing. Consider, for instance, measuring the junction temperature

of diodes.

结温测量是将器件温度与二极管正向压降进行相关而测量的。为了采集P-N结的真实温度，要尽量避免给其增加额外热量，因此正向压降[2]一般是利用很短的电流脉冲进行测量的。如果驱动电流较高，那么短脉冲就特别重要。在高亮度LED测量中往往如此。

Junction temperature measurements are performed bycorrelating device temperature to diode forward voltage drop.The forward voltage is measured using very short current pulsesin order to avoid additional heating of the junction to capture the true temperature of the junction. Short pulses are especiallyimportant if the drive current is high， as is often the case withhigh brightness LEDs.

所有的2600A系列数字源表[3]提供10A 脉冲能力，这是最初的2601和2602 数字源表所不具备的。2600A系列数字源表还将最小脉宽缩短至2600系列数字源表的一半，使用户可以设置100µs的脉冲。此外，目前在2600A系列数字源表网络各节点已经可以及时实现脉冲的精密同步。图5和图6对2612[4]和2612A[5]数字源表的双通道脉冲性能进行了对比。

All Series 2600A SourceMeter instruments provide 10A pulsecapability， which the original Models 2601 and 2602 did not.Series 2600A instruments also cut the minimum pulse width ofthe Series 2600 instruments in half， allowing users to programpulses as short as 100µs. Moreover， pulses can now be preciselysynchronized in time over all nodes over a Series 2600A network.Compare the dual channel pulse performance between Models2612 and 2612A in Figures 5 and 6.

 
图5  进入100mW电阻器的双通道10A脉冲。图示的最小可编程脉宽是200µs和240µs，这是在Model 2612型数字源表上利用KIPulse脚本创建的。¹

Figure 5. Two-channel 10A pulse into 100mW resistor. Shown are minimum programmable pulse widths of 200µs and 240µs， created using KIPulse scripts on a Model 2612.¹

1 为2600系列数字源表编写的采用KIPulse脚本的软件，不做改动即可在2600A系列数字源表运行。

图6  进入100mW电阻器的双通道10A脉冲。图示的最小可编程脉宽是100µs，这是在Model 2612A型数字源表上创建的。

Figure 6. Two-channel 10A pulse into 100mW resistor. Minimum programmable pulse width of 100µs shown， created using trigger model on Model 2612A.

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[1]  脉冲调制 http://www.keithley.com.cn/news/prod070329

[2] 正向压降http://www.keithley.com.cn/re/cel

[3] 2600A系列http://www.keithley.com.cn/news/prod080923

[4] 2612http://www.keithley.com.cn/products/dcac/sensitive/?mn=2612

[5] 2612A http://www.keithley.com.cn/products/dcac/currentvoltage/gpmp/?mn=2612A