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PCBA: Measurement of thin films coatings

PCBA example

During PCBA manufacturing, conformal protective coating is customary applied to protect the circuit.  Different coating is applied depending on specification requirements. The coatings range from a simple water soluble dust protection (typically, < 20μm)  to specialized hydrophobic coatings (<1 μm).

MProbeVis MSP enables measurement of the coating thickness directly on the PCBA  to avoid cost and inaccuracy of using  test coupons. The measurement can be done on different areas of the PCBA, including on SMT elements surface to verify uniformity and thickness of the coating. There is, frequently, significant difference between coating thickness on coupon and on actual product. Measuring thin film thickness directly on PCBA makes a big difference in yield of the final product. The measurement is, typically, done using 40 μm or 20 μm measurement spot in the Visible/Vis-NIR range (400-1000 nm).

Measurement coatings on PCBA

Why use MProbeVis MSP?

  • small spot  is required for direct measurement on PCBA and the  spot size needs to be adjusted. Typically, ~ 20 to 40 μm spot size for measurement of on PCB and ~ 10 -20μm on top of SMT components. MProbeVis has up to 4 objectives and calibration can be stored for different configurations.
  • Image of the measurement site and the reticle indicating the exact location of measurement makes it easy to navigate to desired location.
  • Results can be displayed directly on the image.
  • 400nm -1000nm wavelength range works well for most  PCBA applications.
PCBA coating measurement

MPROBE VIS-MSP:  measurement of coating on PCBA 

BASIC SPECIFICATION:
Wavelength range: 400-1000nm
Wavelength resolution:<2 nm
Precision: <0.01nm or 0.01%
Accuracy: <1nm or 0.2% 
 Measurement:< 100ms (typical, depends on sample reflectivity)
Spot size: 2μm to 200 μm (depending on objective)
Integrated 2MB camera to display measurement area
Custom holders and automation is available

Read more about MProbe MSP
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