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Test coverage rate.
發表時間:2009-06-30 此文章有19781人閱覽

〔Capacitor〕:

  1. capacitor parallel with 10 times value of its capacitor, this capacitor can not detect.  for example C1=1nf , C2=1uf, C1 can not measure precisely.

           C1《《 C2 , C1 can not measure precisely.

     2. Capacitor parallel with inductor.: can measure with the phase split metood. Hard to dect out.。

  (Capacitor parallel with small resistor.)

  1. 300PF capacitor:measure value higher than standard value duo to the stray capacitance effect.
  2. electrolytic capactor polarity reverse:(other brandcoverage rate from 30 to 40%, ADSYS ECJ technologies coverage rate up to 100%. No missing judge.

〔Resistor〕:

  1. resistor parallel with capacitor: add test delay time up to 500ms,repeat test less than 5 times, the measure value may be unstable, due to the capacitor memorizied effect.
  2. Resistor parallel with resistor:measure valure Rx=R1*R2/(R1+R2)=modify the standard value.
  3. Resistor parallel with inductor: for small value of inductor, equivalent to short circuit, even R paralle L mode can not measure precisely.
  4. Resistor parallel with JUMPER wire:Resistor can not measurement, duo to the JUMPER wire short circuit.
  5. Resistor parallel with 20 times value of resistor: the large value resistor can not be measured.

〔Diode〕:

  1. Diode parallel with a inductor: diode can not be measured.
  2. Diode parallel with JUMPER or fuse; diode can not be measured.
  3.  Zener Diode:The breakdown voltage higher than ICT DC source voltage, can not measure its bredown voltage.
  4. Diode parallel with another diode: can not measure on other brand ICT, but ADSYS can detect missing part with the DR mode.

〔Others〕:

  1. XTAL output frequency:can not be measured, but ADSYS can detect the missing part problen with a XTAL which its frequency lss than 4MHZ.
  2. in case a protect diode parallel with a IC pin, a poor contact of this IC pin can not be detected, due to the circuit parallel effect.
  3. Single end pin can not detect the continuity problems.

Classify

Solution

ADSYS

Other brand 

C

Electrolytic capacitor polarity.

Up to100%,no missing judge.

coverage rate lower than 50%, high loss rate.

Capacitor parallel with inductor.

stimus frequency up to 2MHz. Wide measuring range.

1 Mhz stimulus, narrow measure range

sall value of capacitor :300p

Easy to measure with 2MHz AC stimulus.

Hard to measure due to 1MHz stimulus

Small capacitor parallel with big capacitor.

circuit principle problem.

circuit principle problem.

Resistor parallel with capacitor.

Measure Z has chance,need time delay to omit the side effect.

small capacitor parallel with big resistor.

small resistor can be meaured. big resistor though precise measurement.

Resistor parallel with inductor.

circuit principle problem.

circuit principle problem.

Resistor parallel with JUMPER

circuit principle problem.

circuit principle problem.

Diode

Diode parallel with inductor.

circuit principle problem.

circuit principle problem.

Diode parallel with JUMPER or FUSE.

circuit principle problem.

circuit principle problem.

Zener Diode

circuit principle problem.

circuit principle problem.

Diode parallel with diode.

DR mode.

Others 

XTAL frequency.

circuit principle problem.

circuit principle problem.

IC protect diode parallel with external diode.

circuit principle problem.

circuit principle problem.

single end continuity problem.

Show the relative component fail.

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