analog测试介绍

Analog Source file: "analog/r1" disconnect all
connect s to "c1-1" Relay control connect i to "c1-2" resistor 1.00k, 5, 5, re3, ar100m test ! "r1" test !... High, Low limit
IIG
Module 14-24
impedance in the Guard bus
解法:把MOA接在ZIG兩端, 使流經ZIG電流=0
Rref
S-Bus
Rx IRx
I-Bus
Iref
MOA
VMOA
Vs
ZSG
ZIG ZL
G-Bus
L-bus or
Zg
disconnect all connect s to "Rx-1" connect i to "Rx-2" connect g to "Z-1"; l to "Z-1" connect gl to "Z-1" resistor <value, tol, options>
現象: 當ISG流過Zg, 會產生壓降, 壓降越大, 引起ZIG電流越 大
Rref
S-Bus
Rx
IRx
I-Bus
Iref
MOA
VMOA
Vs
ZSG ISG
Zg
G-Bus
ZIG
disconnect all connect s to "Rx-1" connect i to "Rx-2" connect g to "Z-1" resistor <value, tol, options>
VMOA
Rx=-(Vs/VMOA)*Rref
Module 14-3
Analog In-Circuit Test
TESTPLAN ...
Call Pre-shorts ... Call Shorts Call Analog_Tests ...
Sub Pre-shorts test "analog/rpot1" test "analog/j2" ... Sub Analog_Tests test "analog/r1" test "analog/r2" ...
Rref
S-Bus
Rx
IRx
I-Bus
Iref
MOA
VMOA
Vs
ZSG
ZIG
"Zsg-2"
G-Bus
IRx = Iref
disconnect all connect s to "Rx-1" connect i to "Rx-2" connect g to "Zsg-2" resistor <value, tol, options>
Vs
IRx = Iref
disconnect all connect s to "rx-1" connect i to "rx-2" resistor <value, tol, options>
Module 14-14
Guarding
目的: 解決測試電路板上因線路串並聯(Delta接)所造成量到 的零件值偏低或偏高之現象 原理: 利用Op-Amp 特性 - virtual ground, 使流經Zig電流=0
Guarding Rule
S-Bus
Rx
I-Bus
1. 選擇ZIG > ZSG
ZIG
ZSG
G-Bus
2. 若ZIG太小
(1) 把S, I bus 對調 or (2) 降低 Rref 參數 or (3) 拿掉guarding
3. 若ZSG太小 =>加A bus, sense A
=>加 L bus, sense L
S-Bus I-Bus
disconnect all connect s to "J1-1" connect i to "J1-2"
Rref
jumper 9k, re3, wb, ar100m, op
threshold open
Vs
DC source am0.1

MOA
Internal DC Voltmeter
Module 14-9
電容 & 電感
測法: 送交流訊號, 利用MOA測量零件電容或電感值, 在程式上下限範圍內為 PASS Zx
"Zx-1" "Zx-2" PC Board
S-Bus I-Bus
disconnect all connect s to "Zx-1" connect i to "Zx-2" capacitor 10n, 15,15, re4, fr1024 inductor
disconnect all connect s to "Rx-1" connect i to "Rx-2" ; b to "Rx-2" resistor < val, +tol, -tol, option, sb > Rref
Rx
S-Bus
ZI B-bus
I-Bus
sb: sense b
Vs
ZB
MOA
IPG 會根據線路結構產生 4-wire/6-wire 程式
Vs
AC source am0.1
MOA
learn雜散電容常用參數: comp nocomp
Module 14-13
Parallel Impedances
現象: 測試電路板上零件有串並聯線路(Delta接), 造成量到 的零件值偏低或偏高
Rref
Iref
S-Bus
Rx IRx
I-Bus
MOA
VMOA
Module 14-18
Correct losses on S-Bus : sa, en
測法:治具上多加一條繞線, 用來sense實際送到PCB的電壓 Zs : 從Vs到PCB之間的傳輸損失
Virtual Ground
disconnect all connect s to "Rx-1"; a to "Rx-1" connect i to "Rx-2" resistor val, +tol, -tol, option, sa,en Rref
exact Vs
Virtual ground
Zs S-Bus
Vs
Rx
ZI
I-bus
Rref
A-bus B-bus ZB
DVM
Voltage offset at MOA's virtual ground
MOA
Vref
Internal DC Voltmeter
Module 14-23
impedance in the Guard bus
3-wire measurement
6-wire measurement
How to develop 4-wire/6-wire test
目的: 精確測試小電阻, 大電容 作法: 先在 board consultant 內 把 Tolerance Multiplier 參數設 0.1 把 Remote Sensing 參數設 ON 把小電阻, 大電容上下限設窄 然後用 IPG test consultant 發展程式
128Hz 1024Hz 8192Hz
Rref
Phase Synchronous Detector &
Vs
AC source am0.1
MOA
Internal AC Voltmeter
測電容常用參數: reX arX frX en ed comp
Module 14-11
小電容
測法: 在第一次測試, 治具還沒吸下去之前, 系統先learn 治具雜散電容, 等治具被吸下去, 才測量零件電容值 In testplan: C1
Internal DC Voltmeter
Module 14-21
Measure Enhancement : en
測法: 1. sense實際送到零件兩端的電壓 2. 求流過Rref的電流
disconnect all connect s to "Rx-1"; a to "Rx-1" connect i to "Rx-2" ; b to "Rx-2" resistor < val, +tol, -tol, option, sa, sb, en >
4. Xc = 1/(2*π*f*C) XL = 2*π*f*L
Testplan 結構
call Initializations wait for start: call Set_Custom_Options call Test_Sections call Pre_Shorts call Shorts call Analog_Tests call TestJet call Setup_Power_Supplies call Digital_Tests call Analog_Functional_Tests Eject_Ticket : goto Wait_For_Start
Voltmeter 檔位 Expect value Rre3 =1k Ω
測電阻常用參數: reX arX waX en
Module 14-8
Jumper, Fuse & Switch
測法:送直流訊號, 利用MOA測量零件電阻值, 以程式 threshold設定來判斷 PASS或FAIL J1
"J1-1" "J1-2" PC Board
Module 14-4
Analog In-Circuit Test
目的: 測試電路板上analog零件是否空焊, 缺件, 錯件 原理: 利用Op-Amp測量零件值是否在合理範圍
待測零件 Rx IRx
Vs
Rref
Iref
S-Bus I-Bus
MOA
S : Voltage Source I : Input of MOA Rref : reference resistor
analogr1disconnectallconnectc11connectc12resistor100kre3ar100mr1testrelaycontroltesthighlowlimitrexarxwaxenexpectvaluerre31kjumperfuse利用moa測量零件電阻值以程式pass或failmodule148moavssbusibusj1rrefinternaldcvoltmeterj11j12disconnectallconnectj11connectj12jumper9kre3wbar100moppcboarddcsourceam01thresholdopen送交流訊號利用moa測量零件電容或電感值在程式上下限範圍內為passmodule149moavssbusibuszxrrefphasesynchronousdetectorinternalacvoltmeterzx1zx2acsourceam01disconnectallconnectzx1connectzx2capacitor10n1515re4fr1024inductorpcboard128hz1024hz8192hzrexarxfrxenedcomp在第一次測試治具還沒吸下去之前系統先learnmodule1411moavssbusibusc1rrefc11c12acsourceam01testplan
"C1-1" "C1-2" PC Board
S-Bus I-Bus
Rref
sub Characterized learn capacitance on test "analog/c1" learn capacitance off subend ... sub Analog_Incircuit test "analog/c1" ... subend
Zs
S-Bus
Rx A-bus
I-Bus
sa: sense a en: enhancement
Internal DC Voltmeter
Vs
ZA
DVM
MOA
Module 14-18
Correct losses on I-Bus : sb
測法:治具上多加一條繞線, 用來sense實際送到PCB的電壓 ZI : 從MOA到PCB之間的傳輸損失