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2600A系列型数字源表[1]触发模型，允许用户在微秒数量级的精度对源电平和延迟时间进行编程。下面的命令序列将2602A[2]型数字源表SMUA[3]与SMUB[4]开启时间延迟设置为200µs 。

The Series 2600A trigger model allows the user topreprogram source levels and delay times with accuracies onthe order of microseconds. The following command sequenceprograms a 200µs delay between turn-on of SMUA and SMUB ona Model 2602A.

reset()

smua.trigger.source.listv({5})

smua.trigger.source.action = smua.ENABLE

smub.trigger.source.listv({3.5})

smub.trigger.source.action = smub.ENABLE

--Program timer with a delay of 200us

trigger.timer[1].delay = 200e-6

trigger.timer[1].stimulus = smua.trigger.ARMED_EVENT_ID

trigger.timer[1].count = 1

trigger.timer[1].passthrough = false

smua.trigger.source.stimulus = 0

smub.trigger.source.stimulus = trigger.timer[1].EVENT_ID

smua.trigger.endsweep.action = smua.SOURCE_HOLD

smub.trigger.endsweep.action = smub.SOURCE_HOLD

smua.source.output = smua.OUTPUT_ON

smub.source.output = smub.OUTPUT_ON

smub.trigger.initiate()

smua.trigger.initiate()

图4给出前述命令序列的结果。注意，通道之间的延迟大约是196.8µs(在50% SMUA振幅到50% SMUB振幅间测量)。

The results of the preceding command sequence are capturedin Figure 4. Note that the delay between the channels isapproximately 196.8µs (measured at 50% amplitude of SMUA to50% amplitude of SMUB).

图4  2602A型数字源表的直流偏置序列。期望延迟是200µs。实际延迟是196.8µs。

With Series 2600A instruments， a minimum delay time of10µs seconds is possible.

利用2600A系列数字源表，可以实现10µs的最小时间延迟。

Figure 4. DC bias sequencing with Model 2602. Desired delay was 200µs. Actual delay was 196.8µs.

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[1] 2600A http://www.keithley.com.cn/news/prod080923

[2] 2602Ahttp://www.keithley.com.cn/products/semiconductor/sourcemeasureunits/series2600sys/?mn=2602A

[3] SMUA http://www.keithley.com.cn/promo/wb/294/download_file/Bipolar_Tran_App.pdf

[4] SMUB http://www.keithley.com.cn/images/promoimages/Ban_2600_04-a.swf/view_swf