uScope Navigator (Scan) Region Scans have Dropped Frames
uScope Navigator (Scan)

Information in this article applies to:

  • uScope Navigator V4.3 and Later

Article ID: NSC1107 — Created: 20 Nov 2017 — Reviewed: 5 Feb 2018


Scan with Missing FieldsScans have dropped (missing) frames as are evidenced by blank (or black) field images that appear in the tiled mosaic while scanning.


This problem is caused by camera data packets that are not receive by the PC over USB. Image data consume high USB bandwidth that is too fast for some PCs and laptops. The result is that parts of the image data are lost.

The uScope software detects and retries each dropped image. However, it does eventually "give up" and move to the next field.


There are several things you can try to resolve this problem.

  1. Make sure your uScope is plugged into a USB2 port and not a USB3 port.
  2. Reduce the camera speed until the problem is resolved. Refer to Adjusting Camera Speed for Slower PCs for more information.
  3. Disconnect other USB peripherals that may consume high bandwidth. For example, external hard drive, video camera, and so on.
  4. Check the BIOS settings to make certain the USB ports are set for USB2 mode. Some PCs have on-board USB ports that can work as USB2 or USB3 ports.
  5. For desktop PCs, try a dedicated USB2 plug-in card. This USB2 card, available from Amazon, seems to work well.

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