2602型數(shù)字源表測(cè)試腳本及兩個(gè)典型命令
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IOUT1.source.output = IOUT1.OUTPUT_ON --Turn ON SMU outputs
iout1 = {} --Declare table to hold measurements at output IOUT1; table index begins with 1
for j = 0, MaxCode do --j is the code applied to the digital inputs
DIO.writeport(j) --Apply digital inputs
delay(0.001) --Allow 1ms settling time
iout1[j+1] = -IOUT1.measure.i() --Minus sign corrects for polarity of measurements
end –for
IOUT1.source.output = IOUT1.OUTPUT_OFF --Turn OFF outputs of all SMUs
一旦測(cè)量完成，節(jié)點(diǎn)1測(cè)試腳本處理器將執(zhí)行所有計(jì)算，并檢測(cè)通過(guò)/失效狀態(tài)數(shù)據(jù)。腳本語(yǔ)言擁有一個(gè)廣泛的公式庫(kù)，它允許TSP執(zhí)行復(fù)雜的數(shù)據(jù)計(jì)算，而且不需要向主機(jī)控制器傳送數(shù)據(jù)進(jìn)行處理。這個(gè)完整的示例程序說(shuō)明2602型數(shù)字源表如何執(zhí)行線性回歸計(jì)算。
--Compute maximum integral nonlinearity(INL)
--Check for monotonicity; Compute maximum differential nonlinearity(DNL)
--Slope_bf and intercept_bf are the slope and intercept of the best-fit straight line
inlmax_iout1 = 0
dnlmax_iout1 = 0
mono_iout1 = “Monotonic”
for j = 0, MaxCode do
inl_iout1 = math.abs(iout1[j+1]-(slope_bf * j + intercept_bf)) --Calcs for IOUT1
if inl_iout1 > inlmax_iout1 then
inlmax_iout1 = inl_iout1
end --if
if j > 0 then
--Test for monotonicity
diff_iout1 = iout1[j] – iout1[j-1]
if diff_iout1 < 0 then
mono_iout1 = “NON-Monotonic”
end --if
--Compute dnl and test for max.
dnl_iout1 = math.abs(diff_iout1 – Lsb)
if dnl_iout1 > dnlmax_iout1 then
dnlmax_iout1 = dnl_iout1
end –if
end --if
end --for
inl_iout1_lsb = inlmax_iout1 / Lsb --Express INL and DNL in terms of nominal LSB
dnl_iout1_lsb = dnlmax_iout1 / Lsb
一旦計(jì)算出各種DAC參數(shù)，TSP將檢測(cè)數(shù)值并確定器件的通過(guò)/失效狀態(tài)。然后，它通過(guò)向節(jié)點(diǎn)1 DIO端口寫(xiě)入數(shù)字位模式，向器件機(jī)械手發(fā)送正確的分揀命令。
if PartStatus =”GOOD” then
DIO.writeport(GoodBitPattern) --Send “good part” bit pattern to component handler
else
DIO.writeport(BadBitPattern) --Send “bad part” bit pattern to component handler end –if
由于所有測(cè)試數(shù)據(jù)都要經(jīng)過(guò)TSP的處理和評(píng)估，因此不需要向主機(jī)控制器發(fā)送所有數(shù)據(jù)。不過(guò)，當(dāng)需要SPC或者滿足其他數(shù)據(jù)記錄或保持記錄要求時(shí)，這很容易完成。print函數(shù)向2602型數(shù)字源表輸出隊(duì)列寫(xiě)入指定參數(shù)，主機(jī)控制器可以上載這些參數(shù)。如果需要，可以在儀器前部面板顯示器上可以顯示數(shù)據(jù)和/或測(cè)試結(jié)果。此外，還可以使用標(biāo)準(zhǔn)的“C”格式化字符串，對(duì)數(shù)據(jù)進(jìn)行格式化。
--Send the monotonicity results and max INL and DNL values measured at IOUT1
print(string.format(“%s, %1.2f, %1.2f”, mono_iout1, dnl_iout1_lsb, inl_iout1_lsb))
--Display INL & DNL on front panel displays
MASTER.display.clear()
MASTER.display.setcursor(1,1,0)
MASTER.display.settext(string.format(“INL= %1.2f LSBs”, inl_iout1_lsb))
MASTER.display.setcursor(2,1,0)
MASTER.display.settext(string.format(“DNL= %1.2f LSBs, dnl_iout1_lsb))
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