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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